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 de Astrofísica de Canarias
D. Gandolfi
Universita degli Studi di Torino
Landessternwarte Heidelberg-Königstuhl
H. J. Deeg
Universidad de la Laguna
Instituto de Astrofísica 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 de Astrofísica 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 de Astrofísica 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 de Astrofísica de Canarias
E. Palle
Instituto de Astrofísica de Canarias
Universidad de la Laguna
M. Patzold
Universität zu Köln
J. Prieto-Arranz
Universidad de la Laguna
Instituto de Astrofísica 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- A128Ämneskategorier
Astronomi, astrofysik och kosmologi
DOI
10.1051/0004-6361/201628639