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20 April 2024

» arxiv » 1609.0239

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EPIC 212803289: a subgiant hosting a transiting warm Jupiter in an eccentric orbit and a long-period companion
A. M. S. Smith ; D. Gandolfi ; O. Barragán ; B. Bowler ; Sz. Csizmadia ; M. Endl ; M. C. V. Fridlund ; S. Grziwa ; E. Guenther ; A. P. Hatzes ; G. Nowak ; S. Albrecht ; R. Alonso ; J. Cabrera ; W. D. Cochran ; H. J. Deeg ; Ph. Eigmüller ; A. Erikson ; D. Hidalgo ; T. Hirano ; M. C. Johnson ; J. Korth ; A. Mann ; N. Narita ; D. Nespral ; E. Palle ; M. Pätzold ; J. Prieto-Arranz ; H. Rauer ; I. Ribas ; B. Tingley ; V. Wolthoff ;
Date:	1 Sep 2016
Abstract:	We report the discovery from K2 of a transiting planet in an 18.25-d, eccentric (0.19$pm$ 0.04) orbit around EPIC 212803289, an 11th magnitude subgiant in Virgo. We confirm the planetary nature of the companion with radial velocities, and determine that the star is a metal-rich ([Fe/H] = 0.20$pm$0.05) subgiant, with mass $1.60^{+0.14}_{-0.10}~M_odot$ and radius $3.1pm 0.1~R_odot$. The planet has a mass of $0.97pm0.09~M_{ m Jup}$ and a radius $1.29pm0.05~R_{ m Jup}$. A measured systemic radial acceleration of $-2.12pm0.04~{ m m s^{-1} d^{-1}}$ offers compelling evidence for the existence of a third body in the system, perhaps a brown dwarf orbiting with a period of several hundred days.
Source:	arXiv, 1609.0239
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