Sirius_Alpha Admin
Number of posts : 4320 Location : Earth Registration date : 2008-04-06
| Subject: Second planet at HD 11506. 18th February 2009, 9:06 pm | |
| Bayesian analysis of the radial velocities of HD 11506 reveals another planetary companion http://arxiv.org/abs/0902.2997 - Abstract wrote:
- We aim to demonstrate the efficiency of a Bayesian approach in analysing radial velocity data by reanalysing a set of radial velocity measurements. We present Bayesian analysis of a recently published set of radial velocity measurements known to contain the signal of one extrasolar planetary candidate, namely, HD 11506. The analysis is conducted using the Markov chain Monte Carlo method and the resulting distributions of orbital parameters are tested by performing direct integration of randomly selected samples with the Bulirsch-Stoer method. The magnitude of the stellar radial velocity variability, known as jitter, is treated as a free parameter with no assumptions about its magnitude. We show that the orbital parameters of the planet known to be present in the data correspond to a different solution when the jitter is allowed to be a free parameter. We also show evidence of an additional candidate, a 0.8 MJup planet with period of about 0.5 yr in orbit around HD 11506. This second planet is inferred to be present with a high level of confidence.
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Edasich dK star
Number of posts : 2292 Location : Tau Ceti g - Mid Latitudes Registration date : 2008-06-02
| Subject: Re: Second planet at HD 11506. 24th February 2009, 6:24 am | |
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