Bayesian analysis of the radial velocities of HD 11506 reveals another planetary companion

Mikko Tuomi, S. Kotiranta

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)
22 Downloads (Pure)

Abstract

Aims. We aim to demonstrate the efficiency of a Bayesian approach in analysing radial velocity data by reanalysing a set of radial velocity measurements. Methods. 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. Results. 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.

Original languageEnglish
Pages (from-to)L13-L16
JournalAstronomy and Astrophysics
Volume496
Issue number2
Early online date24 Feb 2009
DOIs
Publication statusPublished - 1 Mar 2009

Keywords

  • Methods: statistical
  • Planetary systems
  • Stars: individual: HD 11506
  • Techniques: radial velocities

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