Nespral, D.; Gandolfi, D.; Deeg, H. J.; Borsato, L.; Fridlund, M. C. V.; Barragán, O.; Alonso, R.; Grziwa, S.; Korth, J.; Albrecht, S.; Cabrera, J.; Csizmadia, Sz.; Nowak, G.; Kuutma, T.; Saario, J.; Eigmüller, P.; Erikson, A.; Guenther, E. W.; Hatzes, A. P.; Montañés-Rodríguez, P.; Palle, E.; Pätzold, M.; Prieto-Arranz, J.; Rauer, H.; Sebastian, D.
Bibliographical reference
Astronomy and Astrophysics, Volume 601, id.A128, 8 pp.
Description
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 ± 7.5M⊕ and provides a marginal detection
of K2-19c, with a mass of Mc = M⊕. 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
± 8.9M⊕ for K2-19b and of M⊕
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.
RV data are only available at the CDS via anonymous ftp to
http://cdsarc.u-strasbg.fr (
http://130.79.128.5) or via
http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/601/A128
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