Habitable Planets, Some "serious" planetary systems |
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Habitable Planets, Some "serious" planetary systems |
 Sep 2 2006, 09:39 AM
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#16
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Member  Group: Members Posts: 249 Joined: 11-June 05 From: Finland (62°14′N 25°44′E) Member No.: 408  |
See also the Systemic Project website maintained by him. The Java-based Systemic Console lets you search new planets and improved orbits.
-------------------- The universe is not only stranger than we imagine, it is stranger than we can imagine.
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| Guest_AlexBlackwell_* |
Sep 7 2006, 04:36 PM
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#17
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Raymond et al. have a paper being published in the September 8, 2006, issue of Science:
Exotic Earths: Forming Habitable Worlds with Giant Planet Migration Sean N. Raymond, Avi M. Mandell, and Steinn Sigurdsson Science 313, 1413-1416 (2006) Abstract Supporting Online Material N.B. The "Abstract" and "Supporting Online Material" (SOM) links won't go active until later today, when the Science embargo is lifted. |
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Sep 7 2006, 05:44 PM
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#18
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 Senior Member Group: Members Posts: 2492 Joined: 15-January 05 From: center Italy Member No.: 150 |
-------------------- I always think before posting! - Marco -
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| Guest_AlexBlackwell_* |
Sep 7 2006, 05:46 PM
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#19
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| Guest_AlexBlackwell_* |
Sep 7 2006, 07:17 PM
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#20
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QUOTE (AlexBlackwell @ Sep 7 2006, 06:36 AM)  Raymond et al. have a paper being published in the September 8, 2006, issue of Science: Exotic Earths: Forming Habitable Worlds with Giant Planet Migration Sean N. Raymond, Avi M. Mandell, and Steinn Sigurdsson Science 313, 1413-1416 (2006) Abstract Supporting Online Material N.B. The "Abstract" and "Supporting Online Material" (SOM) links won't go active until later today, when the Science embargo is lifted. Here's a related press release. |
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Sep 12 2006, 02:03 PM
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#21
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 Senior Member Group: Members Posts: 2454 Joined: 8-July 05 From: NGC 5907 Member No.: 430 |
QUOTE (AlexBlackwell @ Sep 7 2006, 12:36 PM) Raymond et al. have a paper being published in the September 8, 2006, issue of Science: Exotic Earths: Forming Habitable Worlds with Giant Planet Migration Sean N. Raymond, Avi M. Mandell, and Steinn Sigurdsson Science 313, 1413-1416 (2006) Abstract Supporting Online Material N.B. The "Abstract" and "Supporting Online Material" (SOM) links won't go active until later today, when the Science embargo is lifted. Here is their paper online: http://arxiv.org/abs/astro-ph/0609253 More than a third of the known systems of giant planets may harbor Earth-like planets. -------------------- "After having some business dealings with men, I am occasionally chagrined,
and feel as if I had done some wrong, and it is hard to forget the ugly circumstance. I see that such intercourse long continued would make one thoroughly prosaic, hard, and coarse. But the longest intercourse with Nature, though in her rudest moods, does not thus harden and make coarse. A hard, sensible man whom we liken to a rock is indeed much harder than a rock. From hard, coarse, insensible men with whom I have no sympathy, I go to commune with the rocks, whose hearts are comparatively soft." - Henry David Thoreau, November 15, 1853 |
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Sep 21 2006, 08:11 PM
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#22
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Senior Member Group: Members Posts: 2454 Joined: 8-July 05 From: NGC 5907 Member No.: 430 |
The Spectrum of HD 3651B: An Extrasolar Nemesis?
As a widely orbiting massive object to a known planetary system that could potentially harbor terrestrial planets in its habitable zone, HD 3651B may play the role of Nemesis in this system. http://arxiv.org/abs/astro-ph/0609556 -------------------- "After having some business dealings with men, I am occasionally chagrined,
and feel as if I had done some wrong, and it is hard to forget the ugly circumstance. I see that such intercourse long continued would make one thoroughly prosaic, hard, and coarse. But the longest intercourse with Nature, though in her rudest moods, does not thus harden and make coarse. A hard, sensible man whom we liken to a rock is indeed much harder than a rock. From hard, coarse, insensible men with whom I have no sympathy, I go to commune with the rocks, whose hearts are comparatively soft." - Henry David Thoreau, November 15, 1853 |
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Sep 22 2006, 01:59 PM
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#23
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Member Group: Members Posts: 147 Joined: 14-April 06 From: Berlin Member No.: 744 |
HD 3651B actually harbours a hot saturn in a 62 day orbit at 0.284 AU. There still may be "earths" in the habitable zone behind it.
I thought it might be interesting to compare the most interesting multiple planetary systems (e stands for Earth masses instead of Jupiter masses used for most planets here): Sol [ 0.055e 0.815e 0.003 0.107e 1.000 0.299 0.045 0.053 ] Gliese 876 at 15 lyrs [ 0.023 0.56 1.935 ] HD 69830 at 41 lyrs [ 0.033 0.038 0.058 ] Ups And at 44 lyrs [ 0.69 1.98 3.95 ] HD 37124 at 107 lyrs [ 0.61 0.6 0.683 ] 55 Cnc at 44 lyrs [ 0.045 0.784 0.217 3.92 ] HD 160691 at 49 lyrs [ 0.044 0.521 1.67 3.1 ] And in terms of semi-major axis (AU): Sol [0.387 0.723 1 1.523 5.203 9.537 19.191 30.068 ] Gliese 876 at 15 lyrs [ 0.020 0.13 0.207 ] HD 69830 at 41 lyrs [ 0.078 0.186 0.63 ] Ups And at 44 lyrs [ 0.059 0.83 2.51 ] HD 37124 at 107 lyrs [ 0.53 1.64 3.19 ] 55 Cnc at 44 lyrs [ 0.038 0.115 0.24 5.257 ] HD 160691 at 49 lyrs [ 0.09 0.921 1.5 4.17 ] -------------------- |
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Sep 24 2006, 03:03 PM
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#24
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Member Group: Members Posts: 147 Joined: 14-April 06 From: Berlin Member No.: 744 |
I guess the figures above do not look too sexy but I thought one of our space image collage creators could use the data to create nice graphics of those planetary systems. They are emerging as true SYSTEMS with the level of complexity similar to that of our own Sol. It is a pitty their configurations have not become as familiar.
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Oct 13 2006, 12:03 PM
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#25
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Member Group: Members Posts: 147 Joined: 14-April 06 From: Berlin Member No.: 744 |
There is great news about a planet in one of the "most serious" systems mentioned here. As shown by Spitzer, Ups Andromedae b does not have a uniform temperature like Jupiter but rather a hot and a cool side just like Mercury was once thought to have - and thus may be tidally locked with its star. It is also the very first time that any temperature variation on exoplanet has been measured:
Distant Planet is Half Fire, Half Ice -------------------- |
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Oct 13 2006, 08:27 PM
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#26
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Member Group: Members Posts: 249 Joined: 11-June 05 From: Finland (62°14′N 25°44′E) Member No.: 408 |
It would be weird if hot Jupiters are not tidally locked.
The Upsilon Andromedae b detection is interesting since some suggested that such configuration could not be stable (as opposed to a giant equatorial band and much more even temperatures). -------------------- The universe is not only stranger than we imagine, it is stranger than we can imagine.
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