Mass determination of K2-19b and K2-19c from radial velocities and transit timing variations
Artikel i vetenskaplig tidskrift, 2017

We present radial velocity follow-up observations of K2-19, a compact planetary system hosting three planets, of which the two larger ones, K2-19b and K2-19c, are close to the 3: 2 mean motion resonance. An analysis considering only the radial velocity measurements detects K2-19b, the larger and more massive planet in the system, with a mass of 54.8 +/- 7.5 M-circle plus and provides a marginal detection of K2-19c, with a mass of M-c = 5.9(-4.3)(+7.6) M-circle plus. We also used the TRADES code to simultaneously model both our RV measurements and the existing transit timing measurements. We derived a mass of 54.4 +/- 8.9 M-circle plus for K2-19b and of 7.5(-1.4)(+3.0) M-circle plus for K2-19c. For K2-19b, these masses are consistent with a previous determination that was principally based on a photodynamical analysis of the K2-19 light curve. Differences remain mainly in the mass determination of the more lightweight planet, driven likely by the limited precision of the RV measurements and possibly some as yet unrecognized systematics.

techniques: radial velocities

stars: individual: K2-19

planets and satellites: fundamental parameters

techniques: spectroscopic

stars: fundamental parameters

Författare

D. Nespral

Universidad de la Laguna

Instituto Astrofisico de Canarias

D. Gandolfi

Universita degli Studi di Torino

Landessternwarte Heidelberg

H. J. Deeg

Universidad de la Laguna

Instituto Astrofisico de Canarias

L. Borsato

Università di Padova

Malcolm Fridlund

Chalmers, Rymd- och geovetenskap, Radioastronomi och astrofysik

O. Barragán

Universita degli Studi di Torino

R. Alonso

Universidad de la Laguna

Instituto Astrofisico de Canarias

S. Grziwa

Universität zu Köln

J. Korth

Universität zu Köln

S. Albrecht

Aarhus Universitet

J. Cabrera

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

S. Csizmadia

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

G. Nowak

Instituto Astrofisico de Canarias

Universidad de la Laguna

T. Kuutma

Nordic Optical Telescope

J. Saario

Nordic Optical Telescope

Philipp Eigmüller

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

A. Erikson

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

E. W. Guenther

Thüringer Landessternwarte Tautenburg

A. Hatzes

Thüringer Landessternwarte Tautenburg

P. M. Rodriguez

Universidad de la Laguna

Instituto Astrofisico de Canarias

E. Palle

Instituto Astrofisico de Canarias

Universidad de la Laguna

M. Patzold

Universität zu Köln

J. Prieto-Arranz

Universidad de la Laguna

Instituto Astrofisico de Canarias

H. Rauer

Technische Universität Berlin

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

D. Sebastian

Thüringer Landessternwarte Tautenburg

Astronomy and Astrophysics

0004-6361 (ISSN) 1432-0746 (eISSN)

Vol. 601 Article Number: A128-

Ämneskategorier

Astronomi, astrofysik och kosmologi

DOI

10.1051/0004-6361/201628639