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

D. Nespral ; D. Gandolfi ; H. J. Deeg ; L. Borsato ; Malcolm Fridlund (Institutionen för rymd- och geovetenskap, Radioastronomi och astrofysik) ; O. Barragan ; R. Alonso ; S. Grziwa ; J. Korth ; S. Albrecht ; J. Cabrera ; S. Csizmadia ; G. Nowak ; T. Kuutma ; J. Saario ; P. Eigmuller ; A. Erikson ; E. W. Guenther ; A. P. Hatzes ; P. M. Rodriguez ; E. Palle ; M. Patzold ; J. Prieto-Arranz ; H. Rauer ; D. Sebastian
Astronomy & Astrophysics (1432-0746). Vol. 601 (2017), p. Article Number: A128.
[Artikel, refereegranskad vetenskaplig]

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.

Nyckelord: stars: individual: K2-19; planets and satellites: fundamental parameters; techniques: radial velocities; techniques: spectroscopic; stars: fundamental parameters



Denna post skapades 2017-07-14. Senast ändrad 2017-09-14.
CPL Pubid: 250714

 

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Institutioner (Chalmers)

Institutionen för rymd- och geovetenskap, Radioastronomi och astrofysik (2010-2017)

Ämnesområden

Astronomi, astrofysik och kosmologi

Chalmers infrastruktur