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Centro de Astrofísica da Universidade do Porto

Radial velocity confirmation of Kepler-91 b. Additional evidence of its planetary nature using the Calar Alto/CAFE instrument

J. Lillo Box, D. Barrado-Navascues, T. Henning, L. Mancini, S. Ciceri, P. Figueira, N. C. Santos, F. J. Aceituno, S. F. Sánchez

Abstract
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.

Keywords
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 821926

Astronomy and Astrophysics
Volume 568, Page L1_1
August 2014

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