Uncovering the planets and stellar activity of CoRoT-7 using only radial velocities

J. P. Faria, R. D. Haywood, B. J. Brewer, P. Figueira, M. Oshagh, A. Santerne, N. C. Santos

Research output: Contribution to journalArticlepeer-review

68 Citations (Scopus)

Abstract

Stellar activity can induce signals in the radial velocities of stars, complicating the detection of orbiting low-mass planets. We present a method to determine the number of planetary signals present in radial-velocity datasets of active stars, using only radial-velocity observations. Instead of considering separate fits with different number of planets, we use a birth-death Markov chain Monte Carlo algorithm to infer the posterior distribution for the number of planets in a single run. In a natural way, the marginal distributions for the orbital parameters of all planets are also inferred. This method is applied to HARPS data of CoRoT-7. We confidently recover the orbits of both CoRoT-7b and CoRoT-7c although the data show evidence for the presence of additional signals.

Original languageEnglish
Article numberA31
JournalAstronomy & Astrophysics
Volume588
DOIs
Publication statusPublished - 1 Apr 2016

Keywords

  • Methods: data analysis
  • Planetary systems
  • Stars: individual: CoRoT-7
  • Techniques: radial velocities

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