Issue |
A&A
Volume 588, April 2016
|
|
---|---|---|
Article Number | A31 | |
Number of page(s) | 7 | |
Section | Planets and planetary systems | |
DOI | https://doi.org/10.1051/0004-6361/201527899 | |
Published online | 14 March 2016 |
Uncovering the planets and stellar activity of CoRoT-7 using only radial velocities ⋆
1
Instituto de Astrofísica e Ciências do Espaço, Universidade do
Porto,
CAUP, Rua das Estrelas,
4150-762
Porto,
Portugal
e-mail:
joao.faria@astro.up.pt
2
Departamento de Física e Astronomia, Faculdade de Ciências,
Universidade do Porto, Rua Campo
Alegre, 4169-007
Porto,
Portugal
3
Harvard-Smithsonian Center for Astrophysics, 60 Garden
Street, Cambridge,
MA
02138,
USA
4
Department of Statistics, The University of
Auckland, Private Bag
92019, 1142
Auckland, New
Zealand
5
Institut für Astrophysik, Georg-August-Universität,
Friedrich-Hund-Platz 1,
37077
Göttingen,
Germany
Received: 4 December 2015
Accepted: 27 January 2016
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.
Key words: methods: data analysis / planetary systems / stars: individual: CoRoT-7 / techniques: radial velocities
All data and software presented in this article are available online at https://github.com/j-faria/exoBD-CoRoT7
© ESO, 2016
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