Mass determination of K2-19b and K2-19c from radial velocities and transit timing variations
Journal article, 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

Author

D. Nespral

University of La Laguna

Instituto Astrofisico de Canarias

D. Gandolfi

University of Turin

Heidelberg-Königstuhl State Observatory

H. J. Deeg

University of La Laguna

Instituto Astrofisico de Canarias

L. Borsato

University of Padua

Malcolm Fridlund

Chalmers, Earth and Space Sciences, Radio Astronomy and Astrophysics

O. Barragán

University of Turin

R. Alonso

University of La Laguna

Instituto Astrofisico de Canarias

S. Grziwa

University of Cologne

J. Korth

University of Cologne

S. Albrecht

Aarhus University

J. Cabrera

German Aerospace Center (DLR)

S. Csizmadia

German Aerospace Center (DLR)

G. Nowak

Instituto Astrofisico de Canarias

University of La Laguna

T. Kuutma

Nordic Optical Telescope

J. Saario

Nordic Optical Telescope

Philipp Eigmüller

German Aerospace Center (DLR)

A. Erikson

German Aerospace Center (DLR)

E. W. Guenther

Thüringer Landessternwarte Tautenburg

A. Hatzes

Thüringer Landessternwarte Tautenburg

P. M. Rodriguez

University of La Laguna

Instituto Astrofisico de Canarias

E. Palle

Instituto Astrofisico de Canarias

University of La Laguna

M. Patzold

University of Cologne

J. Prieto-Arranz

University of La Laguna

Instituto Astrofisico de Canarias

H. Rauer

Technische Universität Berlin

German Aerospace Center (DLR)

D. Sebastian

Thüringer Landessternwarte Tautenburg

Astronomy and Astrophysics

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

Vol. 601 Article Number: A128-

Subject Categories

Astronomy, Astrophysics and Cosmology

DOI

10.1051/0004-6361/201628639

More information

Latest update

5/29/2018