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 de Astrofísica de Canarias
D. Gandolfi
University of Turin
Heidelberg-Königstuhl State Observatory
H. J. Deeg
University of La Laguna
Instituto de Astrofísica 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 de Astrofísica 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 de Astrofísica 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 de Astrofísica de Canarias
E. Palle
Instituto de Astrofísica de Canarias
University of La Laguna
M. Patzold
University of Cologne
J. Prieto-Arranz
University of La Laguna
Instituto de Astrofísica 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- A128Subject Categories
Astronomy, Astrophysics and Cosmology
DOI
10.1051/0004-6361/201628639