2018MNRAS.475.1765B

Query : 2018MNRAS.475.1765B

2018MNRAS.475.1765B - Mon. Not. R. Astron. Soc., 475, 1765-1776 (2018/April-1)

K2-139 b: a low-mass warm Jupiter on a 29-d orbit transiting an active K0 V star.

BARRAGAN O., GANDOLFI D., SMITH A.M.S., DEEG H.J., FRIDLUND M.C.V., PERSSON C.M., DONATI P., ENDL M., CSIZMADIA S., GRZIWA S., NESPRAL D., HATZES A.P., COCHRAN W.D., FOSSATI L., BREMS S.S., CABRERA J., CUSANO F., EIGMULLER P., EIROA C., ERIKSON A., GUENTHER E., KORTH J., LORENZO-OLIVEIRA D., MANCINI L., PATZOLD M., PRIETO-ARRANZ J., RAUER H., REBOLLIDO I., SAARIO J. and ZAKHOZHAY O.V.

Abstract (from CDS):

We announce the discovery of K2-139 b (EPIC 218916923 b), a transiting warm-Jupiter (Teq = 547 ± 25 K) on a 29-d orbit around an active (log R′HK = -4.46 ± 0.06) K0 V star in K2 Campaign 7. We derive the system's parameters by combining the K2 photometry with ground-based follow-up observations. With a mass of 0.387_ - 0.075_ + 0.083 ^MJ and radius of 0.808_ - 0.033_ + 0.034 ^RJ, K2-139 b is one of the transiting warm Jupiters with the lowest mass known to date. The planetary mean density of 0.91_ - 0.20_ + 0.24 ^ g cm–3can be explained with a core of ∼50 M⊕. Given the brightness of the host star (V = 11.653 mag), the relatively short transit duration (∼5 h), and the expected amplitude of the Rossiter-McLaughlin effect (∼25m s–1), K2-139 is an ideal target to measure the spin-orbit angle of a planetary system hosting a warm Jupiter.

Abstract Copyright: © 2017 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): planets and satellites: detection - planets and satellites: individual: K2-139 b (EPIC 218916923b) - stars: fundamental parameters - planetary systems

Simbad objects: 4

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Number of rows : 4
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 HD 149026b Pl 16 30 29.6185771608 +38 20 50.308980864           ~ 388 1
2 K2-139b Pl 19 16 15.9692401056 -17 54 38.409512868           ~ 23 0
3 K2-139 * 19 16 15.9692401056 -17 54 38.409512868   12.43 11.65     K0V 29 0
4 * b Aql PM* 19 24 58.1999714302 +11 56 39.888480530 6.35 5.93   4.7   G7IVHdel1 522 0

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