More Bayesian analysis of multiplanet systems

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More Bayesian analysis of multiplanet systems

Post by Lazarus on 14th August 2011, 5:52 pm

Detecting extrasolar planets from stellar radial velocities using Bayesian evidence

From back in December, not sure if this got posted here though.

In summary, their 47 UMa model reveals a fourth period, but it is around 1 year which suggests it is an artifact. For HD 10180 they find evidence for six planets, no strong evidence for the innermost planet "b" (confusingly they redesignate the confirmed planets from b-g, then again it could be argued that the original system which assigned "b" to a relatively low-probability candidate was dubious in the first place).
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Re: More Bayesian analysis of multiplanet systems

Post by tommi59 on 16th August 2011, 3:06 pm

Lazarus you think planet with 1 years period around this star I mean around 1 AU from star is very unlikely? 1.5 AU distance to the next one is too close? HD 10180-in day of anouncement they seemed to be sure b is existing -now they are not ??Do I well understood


Last edited by tommi59 on 16th August 2011, 4:11 pm; edited 1 time in total
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Re: More Bayesian analysis of multiplanet systems

Post by Lazarus on 16th August 2011, 3:15 pm

tommi59: it is not that an orbital period of 1 year is especially unlikely. The problem with orbital periods close to 1 year is that they might be arising from errors in correcting for the Earth's orbital motion. There's also the issue that a star may be below the horizon for part of the year, which leads to a 1 year spacing between groups of observations. This makes the detection of periodicities close to 1 year fairly suspect, especially at smaller RV amplitudes.
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Re: More Bayesian analysis of multiplanet systems

Post by tommi59 on 16th August 2011, 4:13 pm

ok I understand
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Re: More Bayesian analysis of multiplanet systems

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