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K2-99: 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 ; Malcolm Fridlund (Institutionen för rymd- och geovetenskap, Radioastronomi och astrofysik) ; S. Grziwa ; E. Guenther ; A. P. Hatzes ; G. Nowak ; S. Albrecht ; R. Alonso ; J. Cabrera ; W. D. Cochran ; H. J. Deeg ; F. Cusano ; 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
Monthly notices of the Royal Astronomical Society (0035-8711). Vol. 464 (2016), 3, p. 1-10.
[Artikel, refereegranskad vetenskaplig]

We report the discovery from K2 of a transiting planet in an 18.25-d, eccentric (0.19 ± 0.04) orbit around K2-99, an 11th magnitude subgiant in Virgo. We con- firm the planetary nature of the companion with radial velocities, and determine that the star is a metal-rich ([Fe/H] = 0.20 ± 0.05) subgiant, with mass 1.60+0.14 -0.10 M⊙ and radius 3.1 ± 0.1 R⊙. The planet has a mass of 0.97 ± 0.09 MJup and a radius 1.29 ± 0.05 RJup. A measured systemic radial acceleration of -2.12 ± 0.04 m s-1d-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.

Nyckelord: Planetary systems, Planets and satellites: detection, Planets and satellites: individual: K2-99



Denna post skapades 2017-01-30. Senast ändrad 2017-02-15.
CPL Pubid: 247902

 

Institutioner (Chalmers)

Institutionen för rymd- och geovetenskap, Radioastronomi och astrofysik (2010-2017)

Ämnesområden

Astronomi, astrofysik och kosmologi

Chalmers infrastruktur