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Major Extrasolar Planet Discovery, January 25/26, 2006 |
| Guest_paulanderson_* |
 Jan 24 2006, 05:57 AM
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Apparently based on observations from the European Southern Observatory, with ESA TV broadcast on January 25 and article in Nature magazine on January 26:
http://www.spaceref.com/news/viewsr.html?pid=19362 http://television.esa.int/default.cfm# |
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Mar 15 2006, 10:16 PM
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 Senior Member  Group: Members Posts: 2454 Joined: 8-July 05 From: NGC 5907 Member No.: 430 |
Astrophysics, abstract
astro-ph/0603335 From: Hugh R. A. Jones [view email] Date: Tue, 14 Mar 2006 02:13:30 GMT (306kb) High eccentricity planets from the Anglo-Australian Planet Search Authors: Hugh R. A. Jones, R. Paul Butler, C.G. Tinney, Geoffrey W. Marcy, Brad D. Carter, Alan J. Penny, Chris McCarthy, Jeremy Bailey Comments: to appear in MNRAS We report Doppler measurements of the stars HD187085 and HD20782 which indicate two high eccentricity low-mass companions to the stars. We find HD187085 has a Jupiter-mass companion with a ~1000d orbit. Our formal `best fit' solution suggests an eccentricity of 0.47, however, it does not sample the periastron passage of the companion and we find that orbital solutions with eccentricities between 0.1 and 0.8 give only slightly poorer fits (based on RMS and chi^2) and are thus plausible. Observations made during periastron passage in 2007 June should allow for the reliable determination of the orbital eccentricity for the companion to HD187085. Our dataset for HD20782 does sample periastron and so the orbit for its companion can be more reliably determined. We find the companion to HD20782 has M sin i=1.77+/-0.22M_JUP, an orbital period of 595.86+/-0.03d and an orbit with an eccentricity of 0.92+/-0.03. The detection of such high-eccentricity (and relatively low velocity amplitude) exoplanets appears to be facilitated by the long-term precision of the Anglo-Australian Planet Search. Looking at exoplanet detections as a whole, we find that those with higher eccentricity seem to have relatively higher velocity amplitudes indicating higher mass planets and/or an observational bias against the detection of high eccentricity systems. http://arxiv.org/abs/astro-ph/0603335 -------------------- "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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