K2-99: A subgiant hosting a transiting warm Jupiter in an eccentric orbit and a long-period companion
Journal article, 2016

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.

Planets and satellites: detection

Planetary systems

Planets and satellites: individual: K2-99

Author

A. M S Smith

German Aerospace Center (DLR)

D. Gandolfi

Heidelberg-Königstuhl State Observatory

University of Turin

O. Barragán

University of Turin

B. Bowler

The University of Texas at Austin

S. Csizmadia

German Aerospace Center (DLR)

M. Endl

The University of Texas at Austin

Malcolm Fridlund

Chalmers, Earth and Space Sciences, Radio Astronomy and Astrophysics

S. Grziwa

University of Cologne

E. W. Guenther

Thüringer Landessternwarte Tautenburg

A. Hatzes

Thüringer Landessternwarte Tautenburg

G. Nowak

Instituto Astrofisico de Canarias

University of La Laguna

S. Albrecht

Aarhus University

R. Alonso

Instituto Astrofisico de Canarias

University of La Laguna

J. Cabrera

German Aerospace Center (DLR)

W. D. Cochran

The University of Texas at Austin

H. J. Deeg

Instituto Astrofisico de Canarias

University of La Laguna

F. Cusano

Osservatorio Astronomico Di Bologna

Ph Eigmüller

German Aerospace Center (DLR)

A. Erikson

German Aerospace Center (DLR)

D. Hidalgo

University of La Laguna

Instituto Astrofisico de Canarias

T. Hirano

Tokyo Institute of Technology

M. C. Johnson

The University of Texas at Austin

Ohio State University

J. Korth

University of Cologne

A. Mann

The University of Texas at Austin

N. Narita

University of Tokyo

National Institutes of Natural Sciences - National Astronomical Observatory of Japan

National Institutes of Natural Sciences

D. Nespral

University of La Laguna

Instituto Astrofisico de Canarias

E. Palle

University of La Laguna

Instituto Astrofisico de Canarias

M. Patzold

University of Cologne

J. Prieto-Arranz

Instituto Astrofisico de Canarias

University of La Laguna

H. Rauer

Technische Universität Berlin

German Aerospace Center (DLR)

I. Ribas

Institute of Space Sciences (ICE) - CSIC

B. Tingley

Aarhus University

V. Wolthoff

Heidelberg-Königstuhl State Observatory

Monthly Notices of the Royal Astronomical Society

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

Vol. 464 3 1-10

Subject Categories

Astronomy, Astrophysics and Cosmology

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Latest update

5/29/2018