2017A&A...601A.128N

Query : 2017A&A...601A.128N

2017A&A...601A.128N - Astronomy and Astrophysics, volume 601A128-128 (2017/5-1)

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

NESPRAL D., GANDOLFI D., DEEG H.J., BORSATO L., FRIDLUND M.C.V., BARRAGAN O., ALONSO R., GRZIWA S., KORTH J., ALBRECHT S., CABRERA J., CSIZMADIA S., NOWAK G., KUUTMA T., SAARIO J., EIGMULLER P., ERIKSON A., GUENTHER E.W., HATZES A.P., MONTANES RODRIGUEZ P., PALLE E., PATZOLD M., PRIETO-ARRANZ J., RAUER H. and SEBASTIAN D.

Abstract (from CDS):

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=5.9+7.6–4.3M⊕. 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 7.5+3.0–1.4M⊕ 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.

Abstract Copyright: © ESO, 2017

Journal keyword(s): stars: individual: K2-19 - planets and satellites: fundamental parameters - techniques: radial velocities - techniques: spectroscopic - stars: fundamental parameters - stars: fundamental parameters

VizieR on-line data: <Available at CDS (J/A+A/601/A128): table1.dat>

Simbad objects: 10

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Number of rows : 10
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 * 37 Gem * 06 55 18.6663587832 +25 22 32.503553004   6.343 5.748     G0V 246 0
2 K2-19 * 11 39 50.4803341248 +00 36 12.875047920   13.80 13.00 12.88   G7 75 0
3 K2-19c Pl 11 39 50.4803341248 +00 36 12.875047920           ~ 41 0
4 K2-19d Pl 11 39 50.4803341248 +00 36 12.875047920           ~ 15 0
5 K2-19b Pl 11 39 50.4803341248 +00 36 12.875047920           ~ 42 0
6 Kepler-9 Er* 19 02 17.7544327200 +38 24 03.176851896     13.9 13.791   G2 223 1
7 Kepler-88b Pl 19 24 35.5430965488 +40 40 09.809893020           ~ 68 1
8 Kepler-88c Pl 19 24 35.5430965488 +40 40 09.809893020           ~ 23 1
9 Kepler-89 Ro* 19 49 19.9343204784 +41 53 28.006017936           ~ 175 1
10 Kepler-89c Pl 19 49 19.9343204784 +41 53 28.006017936           ~ 66 1

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