Volume 568, August 2014
|Number of page(s)||4|
|Published online||08 August 2014|
Radial velocity confirmation of Kepler-91 b
Additional evidence of its planetary nature using the Calar Alto/CAFE instrument
Depto. de Astrofísica, Centro de Astrobiología
28691 Villanueva de la Cañada
( Madrid), Spain
2 Max Planck Institute for Astronomy, Königstuhl 17, 69117 Heidelberg, Germany
3 Centro de Astrofísica, Universidade do Porto, Rua das Estrelas, 4150-762 Porto, Portugal
4 Departamento de Física e Astronomia, Faculdade de Ciências, Universidade do Porto, 4150-762 Porto, Portugal
5 Centro Astronómico Hispano-Alemán (CAHA), Calar Alto Observatory, c/ Jesús Durbán Remón 2-2, 04004 Almería, Spain
6 Instituto de Astronomía, Universidad Nacional Autonóma de México, A.P. 70-264, 04510 México, D.F, Mexico
Accepted: 31 July 2014
The object transiting the star Kepler-91 was recently assessed as being of planetary nature. The confirmation was achieved by analysing the light-curve modulations observed in the Kepler data. However, quasi-simultaneous studies claimed a self-luminous nature for this object, thus rejecting it as a planet. In this work, we apply anindependent approach to confirm the planetary mass of Kepler-91b by using multi-epoch high-resolution spectroscopy obtained with the Calar Alto Fiber-fed Echelle spectrograph (CAFE). We obtain the physical and orbital parameters with the radial velocity technique. In particular, we derive a value of 1.09 ± 0.20 MJup for the mass of Kepler-91b, in excellent agreement with our previous estimate that was based on the orbital brightness modulation.
Key words: planets and satellites: gaseous planets / techniques: radial velocities / planets and satellites: individual: Kepler-91 / planets and satellites: individual: KOI-2133 / planets and satellites: individual: KIC 8219268 / planet-star interactions
© ESO, 2014
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