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        Analysis of combined radial velocities and activity of BD+20 1790: : evidence supporting the existence of a planetary companion

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        Author
        Hernán-Obispo, M.
        Tuomi, Mikko
        Gálvez-Ortiz, M. C.
        Golovin, A.
        Barnes, J. R.
        Jones, Hugh
        Kane, S. R.
        Pinfield, D.
        Jenkins, J. S.
        Petit, P.
        Anglada-Escudé, G.
        Marsden, S. C.
        Catalán, S.
        Jeffers, S. V.
        Castro, E. de
        Cornide, M.
        Garcés, A.
        Jones, M. I.
        Gorlova, N.
        Andreev, M.
        Attention
        2299/17713
        Abstract
        This paper presents the simultaneous Bayesian analysis of the radial velocity and activity indices for the K5Ve active star BD+20 1790, that was proposed to host a close-in massive planet by Hern\'an-Obispo et al. (2010). The Bayesian analysis supports the hypothesis of a planetary companion. We present a new orbital solution after removing the two main contributions to the stellar jitter, one that varies with the photometric period and another that varies with the synodic period of the star+planet system. We use a new method to determine these jitter components, considering them as a second and third signals in the system. A discussion on possible magnetic star-planet-interaction is included, based on the Bayesian analysis of the activity indices. We propose two possible sources for flare events of this star: one related to the geometry of the system and the relative movement of the star+planet, and a second one purely stochastic source that is related to the evolution of stellar active regions. Also, we observe for the first time the magnetic field of the star, from spectropolarimetric data.
        Publication date
        2015-04-01
        Published in
        Astronomy & Astrophysics
        Published version
        https://doi.org/10.1051/0004-6361/201219095
        Other links
        http://hdl.handle.net/2299/17713
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