K2-99: a subgiant hosting a transiting warm Jupiter in an eccentric orbit and a long-period companion
Artikel i vetenskaplig tidskrift, 2017

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 confirm 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 (circle dot) and radius 3.1 +/- 0.1 R-circle dot. The planet has a mass of 0.97 +/- 0.09 M-Jup and a radius 1.29 +/- 0.05 R-Jup. A measured systemic radial acceleration of -2.12 +/- 0.04 ms(- 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.

planets and satellites: individual: K2-99

planets and satellites: detection

planetary system


A. M. S. Smith

D. Gandolfi

O. Barragan

B. Bowler

S. Csizmadia

M. Endl

Malcolm Fridlund

Chalmers, Rymd- och geovetenskap, Radioastronomi och astrofysik

S. Grziwa

E. W. Guenther

A. Hatzes

G. Nowak

S. Albrecht

R. Alonso

J. Cabrera

W. D. Cochran

H. J. Deeg

F. Cusano

P. Eigmuller

A. Erikson

D. Hidalgo

T. Hirano

M. C. Johnson

J. Korth

A. Mann

N. Narita

D. Nespral

E. Palle

M. Patzold

J. Prieto-Arranz

H. Rauer

I. Ribas

B. Tingley

V. Wolthoff

Monthly Notices of the Royal Astronomical Society

0035-8711 (ISSN) 1365-2966 (eISSN)

Vol. 464 2708-2716


Hållbar utveckling


Astronomi, astrofysik och kosmologi


Grundläggande vetenskaper


Onsala rymdobservatorium