K2-139 b: a low-mass warm Jupiter on a 29-d orbit transiting an active K0 V star
Artikel i vetenskaplig tidskrift, 2018

We announce the discovery of K2-139 b (EPIC 218916923 b), a transiting warm-Jupiter (Teq = 547 ± 25 K) on a 29-d orbit around an active (log R'_HK = -4.46 ± 0.06) K0V star in K2 Campaign 7. We derive the system's parameters by combining the K2 photometry with ground-based follow-up observations. With a mass of 0.387_-0.075^+0.083 M_J and radius of 0.808_-0.033^+0.034 R_J, K2-139 b is one of the transiting warm Jupiters with the lowest mass known to date. The planetary mean density of 0.91_-0.20^+0.24 g/cm^3 can be explained with a core of ~50 M⊕. Given the brightness of the host star (V = 11.653 mag), the relatively short transit duration (~5 h), and the expected amplitude of the Rossiter-McLaughlin effect (~25m/s), K2-139 is an ideal target to measure the spin-orbit angle of a planetary system hosting a warm Jupiter.

planets and satellites: detection

planetary systems

stars: fundamental parameters

planets and satellites: individual: K2-139 b (EPIC 218916923b)

Författare

O. Barragán

Unknown organization

D. Gandolfi

Unknown organization

A. M. S. Smith

Unknown organization

H. J. Deeg

Unknown organization

Malcolm Fridlund

Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik, Galaktisk astrofysik

Carina Persson

Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik, Galaktisk astrofysik

P. Donati

Unknown organization

M. Endl

Unknown organization

Sz. Csizmadia

Unknown organization

S. Grziwa

Unknown organization

D. Nespral

Unknown organization

Artie P. Hatzes

Unknown organization

W. D. Cochran

Unknown organization

L. Fossati

Unknown organization

S. S. Brems

Unknown organization

J. Cabrera

Unknown organization

F. Cusano

Unknown organization

Ph. Eigmüller

Unknown organization

C. Eiroa

Unknown organization

A. Erikson

Unknown organization

E. W. Guenther

Unknown organization

J. Korth

Unknown organization

D. Lorenzo-Oliveira

Unknown organization

L. Mancini

Unknown organization

M. Pätzold

Unknown organization

J. Prieto-Arranz

Unknown organization

H. Rauer

Unknown organization

I. Rebollido

Unknown organization

J. Saario

Unknown organization

O. V. Zakhozhay

Unknown organization

Monthly Notices of the Royal Astronomical Society

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

Vol. 475 1765-1776

Ämneskategorier

Astronomi, astrofysik och kosmologi

Fundament

Grundläggande vetenskaper

DOI

10.1093/mnras/stx3207