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Note: This article has a small number of in-line citations for an article of its size and currently would not pass criteria 2b.
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Agne
00:47, 26 September 2006 (UTC)
removed:
Do we have permission to use this? And if so, I'm sure the artist would like to get credit. -- mav
As 'Osiris' is just an unofficial nickname, I think this article would be better placed at HD209458 B, its official designation. Any objections to a move? Worldtraveller 16:11, 8 Feb 2005 (UTC)
"HD 209458 b is informally known as
Osiris, though this name was not given by the astronomers credited with its discovery or accepted by the
International Astronomical Union." -- So then how and with whom did this name originate? The links provided (
[1]
[2]) don't seem to obviously provide this information. --
Writtenonsand
15:14, 11 April 2007 (UTC)
If memory serves, it got the nickname due to its star ripping away its atmosphere, like Set dismembered Osiris in Egyptian mythology. Who gave it that name, and when, is a mystery to me. --
Trinexx
21:38, 10 June 2007 (UTC)
I'm an astronomer working on transiting extrasolar planets and HD 209458b comes up in conversation several times a week. Not once in the past decade have I heard the planet referred to as Osiris, except for in this wikipedia article and one scientific paper that coined the nickname. The planet has been mentioned in literally thousands of scientific papers, and all but one make no mention of the name Osiris. I think there is an unfortunate amount of disconnect between people who actively research HD 209458b and those who have kindly contributed to this article; Much of this disconnect can be attributed to the laughable references to this unused name "Osiris." It is time that this wikipedia article removes any mention to "Osiris." 131.142.24.99 ( talk) —Preceding undated comment added 02:27, 7 November 2009 (UTC).
This article has been renamed as the result of a move request. violet/riga (t) 22:07, 30 Mar 2005 (UTC)
I think an estimate of when Osiris becomes a Cthonian planet would be in order. A statement of some astronomer would be best, but if that can't be found, we can do a simple calculation based on the rate of loss and the size of the atmosphere. I tried doing it, but my result is about 4 trillion years (either I am too stupid to do simple math, or Osiris is relatively safe), ignoring that helium (BTW, there must be some helium, why it's not mentioned in the article), oxygen, carbon would have a different loss rate, ignoring the possibility of an orbit change and assuming the rate of atmosphere loss remains constant. 81.211.110.171 18:39, 27 Nov 2004 (UTC)
{{
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help) 10^12 g s-1 and may evaporate down to their core sizes{{
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help) OGLE-TR-56 b ... subject to geometrical blow-off ... 2x10^11 g s-1 ... However, ... HD 209458 b, OGLE-TR-10 b and OGLE-TR-111 b ... may experience classical hydrodynamic blow-off ... can result in higher mass loss rates{{
cite web}}
: Check date values in: |year=
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help); Explicit use of et al. in: |author=
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help) evaporation leads to a rapid expansion ... HD 209458b might be in such a dramatic phase, although with an extremely small probabilityThe HD 209458 article says that teams led by Greg Henry and David Charbonneau first detected the transit of HD209458 b, this article mentions only David Charbonneau and Timothy Brown. According to the NASA press release [5], Greg Henry's group alone found the transit. It could be that NASA didn't know that Charbonneau too had detected the transit. Either way, these articles conflict with each other.-- Jyril 10:29, 24 December 2005 (UTC)
According to IAUC 7307: HD 209458; SAX J1752.3-3138 dated 12th November 1999, Henry et al reported a transit ingress on Nov. 8.
Now David Charbonneau's paper Detection of Planetary Transits Across a Sun-like Star, dated November 19th, cited Henry's circular 7307, but state full transit observations were made on September 9 and 16. So it looks like David saw the transit first but published after Henry had published his later observation (and this would explain NASA not knowing about on November 14, 1999, the date of their press release -added by Wikibob 20:25 24 Dec 2005).
Accordingly I've added Henry's team to the article, and included these refs. - Wikibob 17:04, 24 December 2005 (UTC)
We seem to be giving two separate mass measurements for this planet. From the first section:
And from #Physical parameters:
Can we source either? Or am I misreading something? -- Merovingian ※ Talk 13:53, 11 April 2007 (UTC)
Should we add the atmospheric information like planets in our solar system just without percentages?
The term we should be using when describing the water vapor discovery technique is transit spectroscopy (no article yet). This paper and this one both explain it quite well. Carcharoth 13:42, 12 April 2007 (UTC)
how could this article be documenting a current event if this planet is 7 mill light years away and it is observed by a spectroscope now?--- Saince 15:04, 12 April 2007 (UTC)
The article says that it is almost definitely a Chthonian planet, yet the actual articles on Shthonian planets says the opposite.
The lead of the article includes a one sentence statement that water vapor has been detected, and cites a Space.com offer. However, items in the lead are supposed to be just a sumarry of items elsewhere. However, I can't find any further mention in the article of water being found. To the contrary, there is a description that an anticipated spectral peak from water was not found. Can anyone shed some light on this, please? Johntex\ talk 14:46, 11 April 2007 (UTC)
Here might be a possible source of the discrepancy, quoted from Barman's paper:
"A detection of water in the limb of HD209458b is nominally at odds with a recent Spitzer IRS spectrum that shows no H2O features for this planet (Richardson et al. 2007). These data were taken during secondary eclipse and directly probe the planet’s dayside with negligible contribution from the limb. It is possible that the dayside atmosphere is nearly isothermal (Fortney et al. 2006) which would result in a spectrum with no detectable water absorption features, despite a copious water supply." (Barman, T 2007, 'Identification of Absorption Features in an Extrasolar Planet Atmosphere', accepted for publication in Astrophysical Journal Letters, preprint available at http://arxiv.org/abs/0704.1114)
What I interpret this to mean is this: Richardson obtained the spectrum by subtracting (star) from (star + planet dayside + atmosphere), obtaining (planet dayside + atmosphere), whereas Barman obtained the spectrum by subtracting (star) from (star + atmosphere), obtaining (atmosphere). Because atmospheric absorption features would be lost in the noise of a dayside spectrum, Richardson did not observe the features that Barman did. In other words, they were observing different events, one in which H2O lines could be effectively masked out. Someone42 11:25, 18 April 2007 (UTC)
This question seems a bit silly, but this discovery incidental or sought out. I.E., did the scientist say "I'm going to look for water vapor here," or did he discover it incidentally, i.e. "Hey - Is that water vapor?" -- Jeffrey O. Gustafson - Shazaam! - <*> 16:01, 11 April 2007 (UTC)
We have two paragraphs with almost-identical information, one under "Detection of the atmosphere", the other under "Direct spectral observation". The news kinda does fit under both headings, which probably means there should be a reorganization of the article. But in the meantime, I think it's better to keep everything under a single heading; so which would be better? — AySz88 \ ^-^ 04:42, 12 April 2007 (UTC)
"this hypothesis is still being investigated": what is the reference to this statement? Is it one of the cited footnotes? thanks Timb66 13:34, 18 April 2007 (UTC)
It looks like the atmosphere-currents map was just deleted due to copyright vio. I won't miss it. If I recall right, that map dated to 2003 or earlier. There is no way it matches any model that could be devised today, knowing what we know about the surface cloud albedo, stratosphere, chemicals etc. So good riddance I suppose. Still, I'd like to see a map on par with the one we have for HD 189733 b. -- Zimriel ( talk) 05:31, 28 August 2008 (UTC)
As part of the WikiProject Good Articles, we're doing sweeps to go over all of the current GAs and see if they still meet the GA criteria. I'm specifically going over all of the "Planets and Moons" articles. I believe the article currently meets the criteria and should remain listed as a Good article. I have made several minor corrections throughout the article. Altogether the article is well-written and is still in great shape after its passing in 2006. Continue to improve the article making sure all new information is properly sourced and neutral. I would recommend going through the article and looking into all of the statements that are similar to "As of April 2007..." that should be updated. I would also recommend going through all of the citations and updating the access dates and fixing any dead links. If you have any questions, let me know on my talk page and I'll get back to you as soon as I can. I have updated the article history to reflect this review. Happy editing! -- Nehrams2020 ( talk) 10:41, 20 February 2009 (UTC)
The comment(s) below were originally left at Talk:HD 209458 b/Comments, and are posted here for posterity. Following several discussions in past years, these subpages are now deprecated. The comments may be irrelevant or outdated; if so, please feel free to remove this section.
I find this an Excellent and informative article. One minor observation and request for clarification; If this is a gas giant (and best evidence suggest that planets of this size and estimated density are), then how can it have a Surface temperature if it has no measurable surface? Are we talking about estimated temperature at the edge of the atmosphere? Or are we going by core temperature estimates? I would expect the core temperature to be much higher but I do not know. A citation would be helpful. Sean-- Sean E. Gallagher 14:32, 12 April 2007 (UTC) |
Last edited at 14:32, 12 April 2007 (UTC). Substituted at 16:55, 29 April 2016 (UTC)
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On September 9 not radial velocity but transiting method was used to observe the planet, however it became an exoplanet candidate much earlier, after observations in 1994–1996: https://archive.org/details/arxiv-astro-ph9911436/page/n1/mode/1up Same goes for List of exoplanets discovered before 2000 BTW. Ain92 ( talk) 11:20, 18 April 2020 (UTC)