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The following is an archived discussion of a featured article nomination. Please do not modify it. Subsequent comments should be made on the article's talk page or in Wikipedia talk:Featured article candidates. No further edits should be made to this page.

The article was archived by Hog Farm via FACBot (talk) 28 October 2022 [1].

TRAPPIST-1

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Nominator(s): Jo-Jo Eumerus (talk) 11:22, 25 July 2022 (UTC)[reply]

So, this was already at FAC but failed b/c of lack of supports and some prose concerns so it went through a second peer review during which some prose work was done. This is a star which is noted for the presence of seven planets in a harmonic chain, and some of these planets may even be habitable. Jo-Jo Eumerus (talk) 11:22, 25 July 2022 (UTC)[reply]

Image review

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Nikkimaria (talk) 03:02, 26 July 2022 (UTC)[reply]

Comments from Artem

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  • As many as four of the planets (d, e, f, g) are hypothesised to be orbiting within the habitable zone[c][12] - do you really need this ref 12 in the lead? everything is referenced in the body.
    No; removed it. Jo-Jo Eumerus (talk) 17:08, 26 July 2022 (UTC)[reply]
  • TRAPPIST-1 is in the constellation Aquarius,[13] only[14] five degrees south of the celestial equator.[d][1] - why does 'only' need a separate source? Is it that important?
    Yes, there was a discussion on the peer review about this sentence. Jo-Jo Eumerus (talk) 17:08, 26 July 2022 (UTC)[reply]
  • In 2016, TRAPPIST-1's rotational period was first measured as 1.40±0.05 Earth days,[31] a typical period for M dwarfs.[43] 2017 measurements showed that the star actually rotates about every 3.295±0.003 Earth days,[8][44] though that may constitute the rotation period of active regions rather than stellar rotation according to a 2019 paper.[40] As of 2020, discrepancies between rotational data obtained by the Spitzer Space Telescope and Kepler satellite remain unexplained.[45] - I think it would be better if 2016 and 2017 events would be more implicitly accossiated with instruments, smth like "In 2016, data from the Spitzer show ... In 2017, Kepler measurements show ... As of 2020, discrepancies between those two remain unexplained."
    I think the 2016 observations were from more than one source, but I added the Kepler thing in 2017. Jo-Jo Eumerus (talk) 17:08, 26 July 2022 (UTC)[reply]
  • Kepler satellite remain - why not 'Kepler space telescope'? Isn't it a common name?
    Changed. Jo-Jo Eumerus (talk) 17:08, 26 July 2022 (UTC)[reply]
  • Based on a combination of techniques, an age of about 7.6±2.2 billion years has been established for TRAPPIST-1,[46] - maybe these combination can be added? (if it's not very important, maybe a note would work?)
    It'd be pretty difficult to make it comprehensible without making it overly long, I am afraid. Jo-Jo Eumerus (talk) 17:08, 26 July 2022 (UTC)[reply]
  • while the Sun will leave the main sequence (run out of hydrogen[i]) - maybe just a link - run out of hydrogen - will work?
    Eh, I don't think it's common knowledge what the "main sequence" is. Jo-Jo Eumerus (talk) 17:08, 26 July 2022 (UTC)[reply]
    I suggested this construct during the peer review, and I feel that such a link might be a WP:SURPRISE. At that point in the text, if we're to add a link, hydrogen burning or similar feels more appropriate. ComplexRational (talk) 23:49, 26 July 2022 (UTC)[reply]
  • Possible faculae (bright spots[52]) - is this ref proves that faculae are bright spots? If yes, I think it's redundant. Same for albedo (reflectivity[136]). It just looks strange when there is a translation of 'faculae' or 'albedo' (especially for 'albedo' as a common word in astronomy), and there are no explanation of stuff like Alfvén surface, planet's Hill radius, global Rossby number, etc.
    Some of these are explained in text, I think. Jo-Jo Eumerus (talk) 17:08, 26 July 2022 (UTC)[reply]
  • As of 2017, this is the largest known number of planets within the habitable zone of a star or star system.[135] - what about 2022?
    It is not feasible to keep an article - even at FA standards - up to date on a monthly basis. Thus I only do it once per year during Christmas, hence any 2022 publication isn't used yet. Jo-Jo Eumerus (talk) 17:08, 26 July 2022 (UTC)[reply]
  • making TRAPPIST-1b a candidate magma ocean planet - link magma ocean (it was linked before, but would be useful here)
    Done. Jo-Jo Eumerus (talk) 17:08, 26 July 2022 (UTC)[reply]
  • Models of tidal effects on TRAPPIST-1e have been created.[242] - maybe any details about these models are worthy and can be included?
    I'd prefer to leave them to TRAPPIST-1e. Jo-Jo Eumerus (talk) 17:08, 26 July 2022 (UTC)[reply]

More later. Artem.G (talk) 14:50, 26 July 2022 (UTC)[reply]

  • For each section about a planet you have {Main article} and then start sentence with the planet's name. Maybe it can be simplified - insert links into first sentences and remove {Main}? (just a thought, I have no hard feelings of either variant)
    I think the current form makes it clearer that detailed information on each planet is found elsewhere. Jo-Jo Eumerus (talk) 10:07, 28 July 2022 (UTC)[reply]
  • The discovery of the TRAPPIST-1 planets is often incorrectly attributed to NASA - 'often' is referenced by one source, maybe 'sometimes attributed to NASA'?
    This was a tough one. It certainly seems to me like NASA is frequently (not just "sometimes") mentioned as the discoverer. Jo-Jo Eumerus (talk) 10:07, 28 July 2022 (UTC)[reply]
  • The speculative Breakthrough Starshot proposal for sending small laser-accelerated unmanned probes would require around two centuries to reach TRAPPIST-1.[305] - link is dead
    Changed. Jo-Jo Eumerus (talk) 10:07, 28 July 2022 (UTC)[reply]

Besides these comments, I can't find any serious flaws - as the article was under PR and FAC before, I think everything was polished several times. Nice article, I support it being promoted to FA status. Artem.G (talk) 06:42, 28 July 2022 (UTC)[reply]

Comments from Edwininlondon

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I'm glad to see this back here again. I reviewed it last time around. The prose flows much better now. My comments:

That's it from me. Edwininlondon (talk) 10:50, 31 July 2022 (UTC)[reply]

That was a lot of things, but I think I got most. Jo-Jo Eumerus (talk) 16:15, 31 July 2022 (UTC)[reply]
Indeed. Just a few points left. Edwininlondon (talk) 21:08, 31 July 2022 (UTC)[reply]
I'm happy my points have been addressed. I Support on prose. Edwininlondon (talk) 15:58, 9 August 2022 (UTC)[reply]

Comments (support) from ComplexRational

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As I noted at the close of the peer review, I'm quite pleased with the improvements to this article since FAC1. I just gave it another quick review (having done the bulk of reviewing during the PR) and pending a few minor comments, I'm happy to support promotion to FA.

  • I made a few minor formatting fixes, removed a couple of duplinks, and changed a second occurrence of magma ocean (in the section TRAPPIST-1b) to the more specific lava planet.
  • See my comment above re alt text – the infobox image doesn't have it, but it can be written to reflect the article text.
    Template:Starbox image does not have an option for ALT text, it seems like. Jo-Jo Eumerus (talk) 17:39, 9 August 2022 (UTC)[reply]
    Would it work to specify |alt= in the file link itself? I don't see anything suggestive of the contrary. Complex/Rational 22:38, 9 August 2022 (UTC)[reply]
    Let's see if it shows up. Jo-Jo Eumerus (talk) 10:41, 10 August 2022 (UTC)[reply]
    Indeed it does in the alt text viewer (toolbox). I might also suggest mentioning that TRAPPIST-1 is located very close to the ecliptic. Complex/Rational 16:21, 10 August 2022 (UTC)[reply]
  • I already noted this in one case at the PR – sources published by exactly the same authors in the same year should be distinguished, e.g., 2014a, 2014b, per this and similar guidelines. This is nicely done in some cases, though I've noticed a few instances of broken numbering (e.g., there's a Gillon 2020b but no Gillon 2020a) as well as slightly different author listings. I propose standardizing the authors (even with et al.) and numbering sequence.
    I think I got these? Jo-Jo Eumerus (talk) 17:39, 9 August 2022 (UTC)[reply]
    Still needs a bit of work. In the list of sources, months and days are also provided in some cases, which serve to distinguish the sources there. I'm not sure if style guidelines permit, e.g., "April 2018a" and "July 2018b" unless there are multiple papers from either month with exactly the same authors. In these cases, it should suffice to leave them without letters in the list (using letters only as a "last resort" when authors and dates are not sufficient), but rather distinguish them using WP:CITEREF; thus, the list would include April 2018 and July 2018 but the footnotes would use 2018a and 2018b, respectively.
    Also, I think you might have missed that there's still a 2011b without a 2011a – there's only one paper by Prantzos on the list. Complex/Rational 22:38, 9 August 2022 (UTC)[reply]

Good work! Complex/Rational 16:58, 9 August 2022 (UTC)[reply]

Thanks ComplexRational, that's fine. I had assumed it wasn't, but you know what they say about "assume" - it seemed best to check. Gog the Mild (talk) 11:58, 25 August 2022 (UTC)[reply]

Comments from Sportsfan77777

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I'll review the article. Sportsfan77777 (talk) 21:54, 10 August 2022 (UTC)[reply]

Lead

  • What's rationale for calling TRAPPIST-1 just a star as opposed to a "planetary system" or a "star with a planetary system" (i.e. a "stellar system")? The website calls it a "planetary system" and I would think that when most people say TRAPPIST-1 they are referring to the planetary system, not specifically the star. (i.e. The equivalent article is the solar system, not the Sun.)
    The article covers both, unlike Sun-Solar System, but added planetary system. Jo-Jo Eumerus (talk) 16:43, 11 August 2022 (UTC)[reply]
  • Related to that, I would suggest mentioning TRAPPIST-1 has seven known planets in the first paragraph to give that more emphasis. The current placement of that makes it a bit buried.
    Also done. Jo-Jo Eumerus (talk) 16:43, 11 August 2022 (UTC)[reply]
  • "with the shortest period being" <<<=== suggest rephrasing the sentence to avoid the with "-ing" issue.
    Done. Jo-Jo Eumerus (talk) 16:43, 11 August 2022 (UTC)[reply]
  • Also suggest rephrasing that sentence to put the range of orbital periods first (1.5 to 18.8 days) and then add that they are in resonance afterwards. It's much easier to understand the length of the year part than the resonance part.
    Done. Jo-Jo Eumerus (talk) 16:43, 11 August 2022 (UTC)[reply]
  • "The habitable zone is the region around a star where temperatures are neither too hot nor too cold for the existence of liquid water" <<<=== "could be" neither too hot nor too cold for the existence of liquid water. (see e.g. [2])
    I dunno, usually one would say a planet too cold or too warm is outside of the habitable zone. Jo-Jo Eumerus (talk) 16:43, 11 August 2022 (UTC)[reply]
  • As many as four of the planets (d, e, f, g) are hypothesised to be orbiting within the habitable zone[c] of the star and thus to have temperatures suitable to the presence of liquid water and the development of life. <<<=== Suggest rephrasing to make it clear that what's uncertain is the extent of the habitable zone, as well as possibilities of water and life, not the orbits. The current wording sounds to me like the orbits are uncertain.
    Did this, but I sort of don't like the formulation. Jo-Jo Eumerus (talk) 16:43, 11 August 2022 (UTC)[reply]

Star

  • only[14] <<<=== suggest not citing "only" or moving the citation to the end of the sentence
    Done. Jo-Jo Eumerus (talk) 16:43, 11 August 2022 (UTC)[reply]
  • Dwarf stars like TRAPPIST-1 are over ten times more common than Sun-like stars[27] and these stars are more likely to host small planets than Sun-like stars. <<<=== This sentence is out of place. It should be in the next paragraph after it's stated that TRAPPIST-1 is a red dwarf. (albeit see the new few comments) Also, careful: "dwarf" doesn't mean "small", it means "not a giant star, i.e. stars either on the main sequence or below the main sequence".
    Done. Jo-Jo Eumerus (talk) 16:43, 11 August 2022 (UTC)[reply]
  • "TRAPPIST-1 is a red dwarf;[30] red dwarfs are cold stars with" <<<=== suggest avoiding these types of constructions in general. You could use a construction like "TRAPPIST-1 is a red dwarf,[30] a cold star with... "
    Done. Jo-Jo Eumerus (talk) 16:43, 11 August 2022 (UTC)[reply]
  • red dwarfs are cold stars with a mass less than the Sun, including the spectral types M and K,[31] ad TRAPPIST-1 belongs to class M <<<=== I don't think this captures what a red dwarf is. Suggest "TRAPPIST-1 is a red dwarf, the smallest, coolest, and most common type of star". I would lean towards thinking mentioning K dwarfs is not relevant.
    Need a sauce for such a formulation, and I think that not mentioning K dwarfs would be slightly misleading. Jo-Jo Eumerus (talk) 16:43, 11 August 2022 (UTC)[reply]
  • I think "cool" is preferred to "cold". "cool" is a jargon term. (It's not actually cold, it's a few thousand degrees. That's really hot!)
    Done. Jo-Jo Eumerus (talk) 16:43, 11 August 2022 (UTC)[reply]
  • "Spectral type" is introduced twice in the second paragraph. You should mention "M8.0" when introducing the spectral type.
    Done. Jo-Jo Eumerus (talk) 16:43, 11 August 2022 (UTC)[reply]
  • which is a scheme to categorise stars by their temperature <<<=== I'm not sure this captures the point. "Spectral type" categorises stars by their spectra, hence the name "spectral type". For main sequence stars, that classification implies a bunch of other properties including temperature, mass, lifetime, etc.
    I don't think it does, but the problem is that definitions like these are hard to source. Jo-Jo Eumerus (talk) 16:43, 11 August 2022 (UTC)[reply]
  • Link spectral type to Stellar classification#Harvard spectral classification.
    Done. Jo-Jo Eumerus (talk) 16:43, 11 August 2022 (UTC)[reply]
  • it has only barely sufficient mass to allow nuclear fusion to take place <<<=== this is related to the mass not the radius, but it's in the radius sentence
    Done. Jo-Jo Eumerus (talk) 16:43, 11 August 2022 (UTC)[reply]
  • Suggest starting the rotation period paragraph by noting the disagreement
    It's somewhat hard to explain things when put in that order. Jo-Jo Eumerus (talk) 16:43, 11 August 2022 (UTC)[reply]
  • You could compare the rotation period to the Sun.
    I don't think the rotation period is as important as the mass and luminosity, myself. Plus, it'd need another sauce for the Sun's rotation period. Jo-Jo Eumerus (talk) 16:43, 11 August 2022 (UTC)[reply]
  • "to shine" <<<=== this is too informal. I assume you mean "stay on the main sequence"?
    Kind of, but "shine" captures the pertinent aspect. Jo-Jo Eumerus (talk) 16:43, 11 August 2022 (UTC)[reply]

More commments later. In general, I think the quality of explanations could still be improved. Sportsfan77777 (talk) 23:14, 10 August 2022 (UTC)[reply]

Sportsfan77777, any more to come? Thanks. Gog the Mild (talk) 17:38, 22 August 2022 (UTC)[reply]

Planetary system

  • 1,700,000 kilometres (1,100,000 mi) to 8,900,000 kilometres (5,500,000 mi) <<<=== I would think AU would be a logical default choice of units. (Does 1 million km mean something to a typical reader?) If it were me writing the article, I would also add the distances in stellar radii to elucidate the proximity to the star.
    The AU thing's a reasonable suggestion so it's in. I don't think that the radii of TRAPPIST-1 are known with such precision or so well-known that we could use them as a reference, though. Jo-Jo Eumerus (talk) 13:03, 4 September 2022 (UTC)[reply]
  • A hypothetical eighth planet would be designated TRAPPIST-1i, and its orbital properties have been predicted under the assumption that it orbits exterior to planet h and is part of the planetary resonance <<<=== I would suggest removing the passive voice, as it makes the sentence more confusing. It's also strange to say the properties of have predicted without saying what that orbit would be.
    I am hearing you, but I am not sure how to formulate it otherwise ... also, it does say that we have an idea of what the orbit of an eight body in the resonance would look like. Jo-Jo Eumerus (talk) 13:03, 4 September 2022 (UTC)[reply]
  • In a 2018 paper, the authors <<<=== I would suggest not using "paper" in general (it's too informal), and just refer to the paper directly (i.e. Kral et al. 2018) or name the authors and year separately (In 2018, Kral et al. OR In 2018, Quentin Kral et al.), or if you'd prefer a similar construction, use "a 2018 study".
    Went for the format used by other paper mentions. Jo-Jo Eumerus (talk) 13:03, 4 September 2022 (UTC)[reply]
  • Most of the pre-planetary material was converted into planets <<<=== Rephrase so it doesn't sound so concrete. I don't think it's known for sure that this is the case.
    Done. Jo-Jo Eumerus (talk) 13:03, 4 September 2022 (UTC)[reply]
  • Also, I don't think "pre-planetary" is a real term. Either "solid material" or "rocky material" or both together "solid rocky material"
    Done. Jo-Jo Eumerus (talk) 13:03, 4 September 2022 (UTC)[reply]
  • spin axis ot TRAPPIST-1 <<<=== typo
    Done. Jo-Jo Eumerus (talk) 13:03, 4 September 2022 (UTC)[reply]
  • "on the same plane" ===>>> "in the same plane"?
    Done. Jo-Jo Eumerus (talk) 13:03, 4 September 2022 (UTC)[reply]
  • The planets all orbit on the same plane and, from the perspective of the Solar System, move past TRAPPIST-1 during their orbit <<<=== This would be a good place to introduce transits, i.e. just say "transit in front of TRAPPIST-1"
    Done, not sure if the quote marks are needed. Jo-Jo Eumerus (talk) 13:03, 4 September 2022 (UTC)[reply]
  • 0.775±0.014 <<<=== suggest using the +0.014 −0.014 to keep it consistent with the others
    Done. Jo-Jo Eumerus (talk) 13:03, 4 September 2022 (UTC)[reply]

Size and composition

  • Observations indicate that sizes of the planets range from between Mars-sized to slightly larger than Earth.[86] Their radii are estimated to lie within the range of 75% to 150% that of Earth. <<<=== Condense into one sentence. These are the same thing, but it sounds like they are different things.
    Done but a slight reformulation may be needed. Jo-Jo Eumerus (talk) 13:03, 4 September 2022 (UTC)[reply]
  • consist of large amounts of atmospheres, ice and oceans <<<=== "large amounts of atmospheres" and "large amounts of oceans" aren't proper phrasing
    Rewrote this. Jo-Jo Eumerus (talk) 13:03, 4 September 2022 (UTC)[reply]

Resonances

Stellar light

  • Okay.

Habitable zone

  • Okay.

Moon

  • Might want to clarify that no moons have been detected in general around any exoplanet even close to as small as the ones in the TRAPPIST-1 system
    Eh, I don't think it's necessary; we only have one or two disputed exomoons, period. Jo-Jo Eumerus (talk) 13:03, 4 September 2022 (UTC)[reply]

Magnetic

Formation

More comments later, hopefully later today. Sportsfan77777 (talk) 11:55, 4 September 2022 (UTC)[reply]

Actually, I don't think I'm going to have much free time any time soon. Seeing as it looks like it's going to pass if I just abandon the review and since I already commented on the main things I wanted to comment on, I'm going to leave it at that. Sportsfan77777 (talk) 21:50, 18 September 2022 (UTC)[reply]

Oppose from Sandbh

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I want to support this FAC but concerns raised at FAC1 about the writing not seeming to be up to the high quality FA standard, and a lot of basic copyediting which would have been better done off-FAC and suggesting the article wasn't ready for FAC2 when it was nominated, remain outstanding.

Some examples of writing concerns follow.

Lede para 1, 1st sentence: "TRAPPIST-1 is an ultra-cool red dwarf star in the constellation Aquarius with a planetary system of seven known planets."

Lede para 2, 1st sentence: "The star was discovered in 2000."

Comment. Since para 1, starts off with a reference to a "star" it is not necessary for para 2 to again refer to the "star".

On this one I have to disagree: The star and the planetary system weren't discovered at the same time, so yes we need to specify what "2000" refers to. Jo-Jo Eumerus (talk) 09:16, 30 September 2022 (UTC)[reply]
Yes, a reader who is very familiar with the subject matter may appreciate this nuance. OTOH, as a general reader, I found this doubling up to be off-putting. It now occurs to me that since the article is about TRAPPIST-1, rather than its planetary system, there is no pressing need to distinguish between the star and its planetary system, in that way. Sandbh (talk) 04:23, 2 October 2022 (UTC)[reply]
While I understand the sentiment, the problem I have with the rewrite is that it is actively misleading. Even for a general reader that would be bad. Jo-Jo Eumerus (talk) 10:36, 2 October 2022 (UTC)[reply]
I don't think the distinction between a star and the planets orbiting it is "nuance", really. We're talking about the discoveries of very different kinds of objects, discoveries that were separated by years. XOR'easter (talk) 16:35, 2 October 2022 (UTC)[reply]

Lede, para 3: 1st sentence, "The orbits of as many as four of the planets (d, e, f, g) may correspond within the habitable zone[c] of the star and thus to have temperatures suitable to the presence of liquid water and the development of life."

Comment. The "and thus to far" makes no sense.

I don't see any "and thus so far"? Jo-Jo Eumerus (talk) 09:16, 30 September 2022 (UTC)[reply]
It appeared in the version of the article I was looking at, here.
Sorry, but I can't find it even there. Is there an extra space or something. Jo-Jo Eumerus (talk) 09:28, 3 October 2022 (UTC)[reply]
From my notes, I was concerned about "and thus to have". I don't know where I got the "far" from, sorry. No matter since this example has since been fixed. Sandbh (talk) 05:59, 4 October 2022 (UTC)[reply]

Rotation period and age
2nd sentence: "2017 measurements by the Kepler space telescope showed that the star may instead rotate about every 3.295±0.003 Earth days,[8][47] though that may constitute the rotation period of active regions rather than stellar rotation according to Miles-Páez et al. (2019).[43]"

Comment. Don't start a sentence with a number.

Para 2: "...TRAPPIST-1 is expected to shine for ten trillion years – about 700 times[51] longer than the present age of the Universe[52] – while the Sun will leave the main sequence (run out of hydrogen[k]) in a few billion years.[51] The life expectancy of a small, faint star like TRAPPIST-1 is hundreds to thousands of times longer than that of stars like the Sun.[40]"

Comment: The last sentence is redundant.

Looks like someone else resolved these issues. Jo-Jo Eumerus (talk) 09:28, 3 October 2022 (UTC)[reply]

Activity
"Numerous photospheric features detected on TRAPPIST-1 may introduce inaccuracies in measurements of its planets.[54] Possible faculae (bright spots[55]) have been observed by the Kepler space telescope and Spitzer Space Telescope,[56] but some of TRAPPIST-1's bright spots may be too large to count as faculae.[57] Their effect on the luminosity of TRAPPIST-1 may lead to the planets' densities being underestimated by 8+20−7 percent,[58] and to incorrect estimates of their water content.[59] A correlation between bright spots and flare[l] activity has been found.[35] The mean intensity of TRAPPIST-1's magnetic field is about 600 G[61] although many of its properties cannot be directly measured.[62] This intense magnetic field is driven by chromospheric[m] activity[12] and may be capable of trapping coronal mass ejections.[n][60][64]"

Comment. I do not understand the need for this sentence: "A correlation between bright spots and flare[l] activity has been found.[35]"

This section describes the activity of the star, I thought it would be relevant information. Jo-Jo Eumerus (talk) 09:28, 3 October 2022 (UTC)[reply]
The context is disrupted due to the sentence between, "Possible faculae (bright spots[55]) have been observed by the Kepler space telescope and Spitzer Space Telescope,[56] but some of TRAPPIST-1's bright spots may be too large to count as faculae.[57]" and "A correlation between bright spots and flare[l] activity has been found.[35]" Sandbh (talk) 05:59, 4 October 2022 (UTC)[reply]
Corrected that one. That said, since we are just correcting examples, I think I need to ask whether folks think that the issues can be resolved within the confines of FAC. Jo-Jo Eumerus (talk) 12:43, 4 October 2022 (UTC)[reply]

Size and composition
Para 2: "The densities are too low for a pure magnesium silicate composition, requiring lower-density molecular compounds to be present,[94] such as water."

Comment: The relevance of a pure magnesium silicate composition is not clear.

This is outside my specialization, but I think the meaning is that pure magnesium silicate is as light as rocky material can get, so to account for the low overall density, material of even lower density (like water) must be present. XOR'easter (talk) 15:34, 1 October 2022 (UTC)[reply]
Added a footnote. Jo-Jo Eumerus (talk) 09:28, 3 October 2022 (UTC)[reply]

Resonance
"It could be sufficient to melt the mantles of the four innermost planets, in whole or in part,[124] it would cause the development of subsurface magma oceans in some planets;[125] increase the degassing[u] from the mantle and facilitate the establishment of atmospheres around the planets.[127"

Comment. The construction of this para is clumsy. At 45 words it is too long.

Shortened that one. Jo-Jo Eumerus (talk) 09:28, 3 October 2022 (UTC)[reply]

I suggest the article be copy edited by an uninvolved editor. Sandbh (talk) 08:19, 30 September 2022 (UTC)[reply]

@Sandbh and SandyGeorgia: can I ask if you have any suggestions for editors who can do the copyediting? I am not going to try peer review for the third time, that doesn't work. Jo-Jo Eumerus (talk) 09:16, 30 September 2022 (UTC)[reply]
I've found GOCE to be helpful although I think they are very backlogged at this point. (t · c) buidhe 15:47, 30 September 2022 (UTC)[reply]
Jo-Jo thx for the ping, and I sincerely apologize for losing the plot here; real life medical issues have wreaked havoc with my time lately. One editor who might be able to help bring this over the hump is XOR'easter and I don't know whether ComplexRational has more time to help with the ce. Others that come to mind are @Double sharp, Artem.G, and Ovinus:. I wish I could help more, but it is going to be quite some time before I catch up. SandyGeorgia (Talk) 15:15, 1 October 2022 (UTC)[reply]
I already offered some feedback at the PR to help get the article into better shape pre-FAC. While I'm unsure how much free time I'll have in the next few days/weeks to do substantial copyediting, I'll keep watch and point out anything I find. Complex/Rational 21:15, 4 October 2022 (UTC)[reply]
I have seen this but am rather busy; I'll look when I can find time, though. Double sharp (talk) 20:28, 9 October 2022 (UTC)[reply]
I'm afraid I have a fair amount on my (on- and off-wiki) plate right now and haven't even been properly keeping up with the other FARs. If Planet gets closed and I finish up Yellowstone fires, I'll look at this one. Edit: I actually thought this was an FAR, not an FAC. So unfortunately I won't be able to contribute in a reasonable time. Ovinus (talk) 21:39, 9 October 2022 (UTC)[reply]

When the article is ce'd I recommend that the logical flow of the paragraph topic sentences is checked. For example, in the Resonance section, the topic sentences go in this order:

  1. The planets are in orbital resonances,[101] with the durations of their orbits having ratios of 8:5, 5:3, 3:2, 3:2, 4:3, and 3:2 between neighbouring planet pairs,[102] and with each triplet being in a Laplace resonance.
  2. The close distances of the planets to the host star TRAPPIST-1 result in strong tidal interactions,[108] stronger than for Earth.[109]
  3. The resonances continually excite the eccentricities of the TRAPPIST-1 planets, preventing their orbits from becoming fully circular.
  4. Even if tidal heating does not significantly alter the climates of the planets, tidal heating could influence the temperatures of the night sides and cold traps, where gases are expected to accumulate; it would influence the properties of subsurface oceans[121] where volcanism and hydrothermal venting[t] could occur.

Whereas it appears the logical flow would be stronger if the order was: 1, 3, 2, 4. Sandbh (talk) 04:23, 2 October 2022 (UTC)[reply]

The tidal interactions are the reason why the eccentricities get excited, so I wouldn't agree. Jo-Jo Eumerus (talk) 10:36, 2 October 2022 (UTC)[reply]
I'm fine with the current ordering of the paragraphs in "Resonance". XOR'easter (talk) 16:38, 2 October 2022 (UTC)[reply]
As a general reader, I don't know that the tidal interactions are the reason why the eccentricities get excited. Nor does the current sequence of four topic sentences make this clear. In the first topic sentence, what is a "triplet"? Sandbh (talk) 03:59, 3 October 2022 (UTC)[reply]
Another concern is that the information about the planets is split between two sections. Frex, in the Planetary system section there is a table called "The TRAPPIST-1 planetary system". About 5 screens down, in the List of Planets section, there is another table called "Other characteristics". Why is it necessary to split the data between two different sections, into two tables? Could there not be one consolidated table? A related concern is the structure of the article, as follows:
2	Planetary system
3	Potential atmospheres of the planets
4	List of planets
Why are sections 2 and 4 not consolidated?
--- Sandbh (talk) 04:32, 2 October 2022 (UTC)[reply]
That was a deliberate decision, so that folks can go from the general traits of the system to the list of specific planets. Jo-Jo Eumerus (talk) 10:36, 2 October 2022 (UTC)[reply]

@Gog the Mild: I'll have another look and let you know. Sandbh (talk) 03:58, 12 October 2022 (UTC)[reply]

@Gog the Mild: I'm not pleased to say that my oppose still stands. The items I listed formed only a sample of my concerns. There were several more which I did not list as I considered that the items I did list were sufficient to show that the article needed a thorough copy edit, which it has not yet undergone. Here are some more concerns:
Activity[edit]
Numerous photospheric features detected on TRAPPIST-1 may introduce inaccuracies in measurements of its planets.[54] Possible faculae (bright spots[55]) have been observed by the Kepler space telescope and Spitzer Space Telescope,[56] but some of TRAPPIST-1's bright spots may be too large to count as faculae.[57] A correlation between bright spots and flare[l] activity has been found.[35] The effect of bright spots on the luminosity of TRAPPIST-1 may lead to the planets' densities being underestimated by 8+20 −7 percent,[59] and to incorrect estimates of their water content.[60] The mean intensity of TRAPPIST-1's magnetic field is about 600 G[61] although many of its properties cannot be directly measured.[62] This intense magnetic field is driven by chromospheric[m] activity[12] and may be capable of trapping coronal mass ejections.[n][58][64]
The topic sentence does not make sufficient sense to me. What are "photospheric" features? The second sentence says that bright spots may be too large to count as faculae, but does not sufficiently explain the "so what" if the spots are too large to count as faculae.
Stars lose mass through the stellar wind.[65] Garraffo et al. (2017) computed the mass loss of TRAPPIST-1 to be about 3×10−14 solar masses per year,[66] about 1.5 times that of the Sun,[67] while Dong et al. (2018) simulated the observed properties of TRAPPIST-1 with a mass loss of 4.1×10−15 solar masses per year.[66] The stellar wind properties of TRAPPIST-1 are not precisely determined.[68]
The topic sentence is not specific to Trappist-1. For that matter, what is "the stellar wind"? The sentence would read better as something like, "Trappist-1 loses mass due the activity of...Garraffo et al. (2017) computed the magnitude of the loss to be...". Dong et al.'s figure should also be expressed in terms of how many times it is that of the sun.
Size and composition
The radii of the planets are estimated to lie within the range of 75% to 150% that of Earth,[88] equivalent to Mars-sized to slightly larger than Earth
150% is not "slightly" larger than Earth.
I think I'll need a synonym here ... I think that "larger" on its own implies that such a radius is significantly different from Earth's, but in the context of exoplanetology 150% is only "slightly" larger. Jo-Jo Eumerus (talk) 12:43, 20 October 2022 (UTC)[reply]
Since we need more science-topic FA's I regret to say that while the article appears to be technically accurate it does not yet meet the FA well-written criterion. Sandbh (talk) 06:10, 13 October 2022 (UTC)[reply]

If my lede edits were satisfactory (let me know?) I might be able to help here. Not sure if this is just a copy edit or if it goes beyond that. czar 17:34, 15 October 2022 (UTC)[reply]

@Czar:That edit seems OK to me, although I wouldn't say "atmosphere as a precondition for life" as it's implicit in the scientific discourse rather than explicitly stated. Jo-Jo Eumerus (talk) 08:14, 16 October 2022 (UTC)[reply]
Feel free to edit that as would be appropriate, as I'm just attempting to paraphrase what was previously there.
The part that keeps me from copy editing further is not knowing how far this article needs to go to be comprehensible to a general reader or if we're just shooting for an advanced college student in astronomy as the target audience. I'd lean towards the former in a copy edit, which would include footnoting a lot of detail, such as items it wouldn't make sense to say when reading the article out loud. It looks like the last star FA was Rigel in July 2020 and it wasn't held to that standard then. Without looking at precedent, those are the edits I would want to make for today's bar of FA quality. czar 17:59, 22 October 2022 (UTC)[reply]
Well, it depends. In your judgment, how much work would it be to achieve the former? I know that people complain about excessive footnotes but well, you sometimes can't have it both ways (explained and short) Jo-Jo Eumerus (talk) 09:47, 23 October 2022 (UTC)[reply]

Source review

[edit]

Footnote numbers refer to this version.

Will look at source reliability next. Mike Christie (talk - contribs - library) 20:07, 10 October 2022 (UTC)[reply]

Sources are reliable as far as I can tell, not being knowledgeable about this field. The arXiv links are popping up as alerts but it seems they're just a URL for the text of the papers, not the actual source cited, so that's fine.

Other than as noted above, the links all work. Mike Christie (talk - contribs - library) 22:25, 10 October 2022 (UTC)[reply]

The only issue left is that I think the Wolfram site's website parameter should be ""Eric Weisstein's World of Science". Mike Christie (talk - contribs - library) 15:11, 11 October 2022 (UTC)[reply]

Done. Jo-Jo Eumerus (talk) 08:53, 12 October 2022 (UTC)[reply]
Pass. Mike Christie (talk - contribs - library) 09:10, 12 October 2022 (UTC)[reply]

Support by CactiStaccingCrane

[edit]

Support - content-wise and image-wise, the article is top-notch. Bad content and good layout/prose is much worse than good content and bad layout/prose. People are just nit-picking entropy at this point. CactiStaccingCrane (talk) 16:02, 17 October 2022 (UTC)[reply]

I know that this can be an controversial opinion, so let me detail at what I meant:
  • This article's sourcing is really solid. The author did the right thing by citing the research papers directly instead of citing newspapers. And as Mike Christie's source check shows, there is little if any issue at source-text integrity.
  • The article's prose is also good and reasonably easy to understand. Yes, some jargons need to be explained, some need to be clarified, and some should be substituted by other terms instead. But this should not a deal-breaker for FAC. The prose reviewing effort should be redirected towards WP:URFAs instead, where they are desperately needing more people to repolish old FAs.
CactiStaccingCrane (talk) 16:13, 17 October 2022 (UTC)[reply]
Coordinator note: hi Mike, could I just check whether your source review confirms "there is little if any issue at source-text integrity"? Thanks.
Also, without prejudicing any closure decision, the FAC criteria do not require a nomination to be "reasonably easy to understand", and I fail to understand how a review which notes "some jargons need to be explained, some need to be clarified, and some should be substituted by other terms instead" can conclude "this should not a deal-breaker for FAC." The desire to see limited reviewing resources directed to venues other that FAC is not a sufficient reason to support an FAC nomination if the FAC criteria are not met. Gog the Mild (talk) 13:17, 19 October 2022 (UTC)[reply]
Gog, I did no spotchecking so I can't comment either way on the source-text integrity. If you feel a spotcheck is needed I can try to find time to do one but it might be as well to list it at the usual place in case someone else can get to it; I wasn't planning to do any reviewing for a few days. Mike Christie (talk - contribs - library) 21:36, 19 October 2022 (UTC)[reply]

Oppose from Gog the Mild

[edit]

Recusing to review.

Looking at the lead:

  • "The star itself was discovered". Delete "itself", what else would it be?
  • "The gravity of TRAPPIST-1's neighbouring planets". What does "neighbouring" mean? If what I am guessing then perhaps best to delete it.
  • "As many as four of the planets". Delete "As many as".
  • "an atmosphere, a precondition for life". Really?! And this is the clear consensus of the scholarly sources? Additionally, I do not see this repeated in the article.
  • I note some good uses of in line explanation, per general good practice and MOS:NOFORCELINK. ("Do use a link wherever appropriate, but as far as possible do not force a reader to use that link to understand the sentence. The text needs to make sense to readers who cannot follow links.")

Jumping to "Potential atmospheres".

  • "The existence of atmospheres around TRAPPIST-1 planets is a function of the balance between the decay of such an atmosphere, the amount of atmosphere initially present and the rate at which it is reconstituted by impact events,[76] accretion from a protoplanetary disk[180] and outgassing/volcanic activity.[181] Impact events would be particularly important in the outer planets, as impact events can both add and remove volatiles from the planets; in the outermost planets addition is likely dominant." This prose becomes increasingly impenetrable to a non-expert reader.
  • "including oceans over hundred times larger than Earth's". Either 'a hundred' or 'one hundred'.
  • "If the planets are tidally locked to TRAPPIST-1 and one side of their surface always faces away from the star". It is not a case of "and". 'with' or ', meaning that' would be better.
  • "In the case of a carbon dioxide atmosphere, the burial of carbon dioxide ice under water ice, driven by the density of carbon dioxide ice, the formation of carbon dioxide-water compounds named clathrates[z] and a potential runaway feedback loop between ice melting and evaporation and the greenhouse effect additionally complicate matters.[188]" Beautifully expressed, but not at the appropriate level (IMO) for a general encyclopedia article.
  • "have ruled out that the TRAPPIST-1 planets have hydrogen- or helium-rich atmospheres". Grammar: perhaps 'have ruled out the possibility that the TRAPPIST-1 planets have hydrogen- or helium-rich atmospheres' or similar.
  • "The existence of such an atmosphere and its mass are a function of the initial water mass, by whether the oxygen is dragged out of the atmosphere by escaping hydrogen and by the state of the planet's surface; a partially molten surface could absorb large quantities of oxygen, sufficient to remove an atmosphere." I think that most instances of "by" should be 'of'.
  • "as they are destroyed by the radiation of the star". "are → 'would be'.
  • "Biogenic ammonia or methane production would have to be considerably larger than on Earth to sustain such an atmosphere. It is however possible that the development of organic hazes from ammonia/methane photolysis could shield the remaining molecules." I doubt that a general reader would make much of this. As a minimum it needs an explanation of "Biogenic ammonia or methane production".
  • "Radiative decomposition of carbon dioxide could yield substantial amounts of oxygen, carbon monoxide[203] and ozone." no doubt, whatever "radiative decomposition" might be.

I am full of admiration for this article, in many ways it is excellent. However, in spite of the large amount of work since the article was nominated, the prose still has deficiencies and large parts of it do not seem to do what a Wikipedia aricle is supposed to: explain the topic at the level of a general reader. I appreciated it so much that I want to support it, but objectively I just don't think that it - yet - meets the criteria and so am reluctantly opposing. Gog the Mild (talk) 14:07, 27 October 2022 (UTC)[reply]

Coordinator note (2) -- this is a very long-running nom and unfortunately we're not getting closer to consensus as things go on so I'm pulling the plug; I realise there was a PR before the FAC but at the very least I'd suggest an informal review by some of the above commentators, especially the opposing ones, before any future run at FAC following the usual two-week break. Cheers, Ian Rose (talk) 14:24, 27 October 2022 (UTC)[reply]

The above discussion is preserved as an archive. Please do not modify it. No further edits should be made to this page.
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