Talk:Upsilon Andromedae d

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Good article Upsilon Andromedae d has been listed as one of the Natural sciences good articles under the good article criteria. If you can improve it further, please do. If it no longer meets these criteria, you can delist it, or ask for a reassessment.
July 13, 2006 Good article nominee Listed
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[edit] This is a Good Article

After review, I've determined that this article meets the qualifications for GA status. It is well written, well referenced, and comprehensive. I'm "Mass Passing" this article along with 9 others. The entire list is below. If new developments arise that would effect the references or comprehensiveness of this article, it may affect the others as well.

Keep up the good work. These articles are ideal "good articles". They can't be FA, because there is no way for them to get long enough, but they are as comprehensive and complete as possible, and represent a good effort on the part of the editors. Feel free to message me if you have any questions about my rationale. Phidauex 18:18, 14 July 2006 (UTC)

[edit] Citation 8

It says a Mars size Moon is approx the upper limit for a Jupiter mass planet, this planet is near 4 times jupiter mass, is citation 8 and its corresponding sentence really applicable? -- Nbound 12:29, 12 September 2006 (UTC)

Well, it also states that within the regime of the solar system, the mass fraction of the satellites over the range of gas giants is pretty similar, so it may also apply to extrasolar planets of more than a Jupiter mass. If the sentence stated explicitly that large moons would definitely not form, then I'd agree. However, in the context of a discussion about habitable moons I think the reference is useful. Maybe it might be good to expand the point a bit (though not so much that we swamp the section!), I will agree the sentence as it stands just chucks the reference in there in a rather unexplained way. Chaos syndrome 19:29, 12 September 2006 (UTC)
I actually removed this claim; the reference is undobutably interesting, but it doesnt seem to have any relevance to this article. As you say, the mass FRACTION of the satellite over the range of gas giants is pretty similar, i.e. that means the reference is clear in stating its in proportion to the mass of the primary planet. But I removed it because the reference states "suggest that similar processes could limit the largest moons of extrasolar Jupiter-mass planets to Moon-to-Mars size." Note it says Jupiter-mass. The citation given here says simply omits the Jupiter-mass part. With a 4 times as massive a planet as Jupiter, you get something like half-an-earth mass moon this way (scaling mars-size; this is similar to ratio of the mass of titan and saturn). it states its ~10^4, clearly with quite a variance (Moon - Mars is an order of magnitude difference). With 4*300/10^4= 0.12 (litle over Mars size) as average, and given the order of magnitude variation implied, thats 0.6-0.024. I dont wish to be rude, but you do understand the concept of fraction, right? Its hard to see this from the sentence "the mass fraction of the satellites over the range of gas giants is pretty similar, so it may also apply to extrasolar planets of more than a Jupiter mass." and the conclusions you seem to draw from it.
More importantly this reference http://www.nature.com/nature/journal/v385/n6613/abs/385234a0.html says little over Mars-size (more precisely, 0.12 of earth mass) is sufficient anyways, so theres little point in discussing the size of the moons in this section at all. --89.172.84.10 11:48, 31 May 2007 (UTC)
If you didn't mean to be rude, you could have dropped (or at least rephrased) your comment, which was completely unnecessary to your argument. Evidently that was not your aim, so don't increase the insult by pretending otherwise.
Maybe I was being unclear about my reasons for including that statement in the article: my general feeling is that the possibility of formation of habitably-large moons around jovian or superjovian planets is unknown at the current time (since our total sample size of exomoons is zero, and the total sample size of moons of Mars-mass or above in our solar system is also zero), and there are mechanisms which suggest upper limits on moon masses through certain mechanisms (moon migration and eventual accretion onto the parent planet). Whether the numerical relationship between planet and satellite system found for jovian-mass planets holds in the superjovian regime, the paper doesn't indicate. Note also that the jovian system, while higher mass than the Saturnian one, has the mass distributed among multiple satellites, so even if the satellite system of a superjovian has Mars mass, it might be distributed between many Moon-sized objects. I was just attempting to point out that habitable moon formation is by no means a proven possibility. Chaos syndrome 23:10, 15 July 2007 (UTC)