2019A&A...623A.114L

Query : 2019A&A...623A.114L

2019A&A...623A.114L - Astronomy and Astrophysics, volume 623A114-114 (2019/3-1)

Detection and characterization of an ultra-dense sub-Neptunian planet orbiting the Sun-like star K2-292.

LUQUE R., NOWAK G., PALLE E., DAI F., KAMINSKI A., NAGEL E., HIDALGO D., BAUER F., LAFARGA M., LIVINGSTON J., BARRAGAN O., HIRANO T., FRIDLUND M., GANDOLFI D., JUSTESEN A.B., HJORTH M., VAN EYLEN V., WINN J.N., ESPOSITO M., MORALES J.C., ALBRECHT S., ALONSO R., AMADO P.J., BECK P., CABALLERO J.A., CABRERA J., COCHRAN W.D., CSIZMADIA S., DEEG H., EIGMULLER P., ENDL M., ERIKSON A., FUKUI A., GRZIWA S., GUENTHER E.W., HATZES A.P., KNUDSTRUP E., KORTH J., LAM K.W.F., LUND M.N., MATHUR S., MONTANES-RODRIGUEZ P., NARITA N., NESPRAL D., NIRAULA P., PATZOLD M., PERSSON C.M., PRIETO-ARRANZ J., QUIRRENBACH A., RAUER H., REDFIELD S., REINERS A., RIBAS I. and SMITH A.M.S.

Abstract (from CDS):

We present the discovery and characterization of a new transiting planet from Campaign 17 of the Kepler extended mission K2. The planet K2-292 b is a warm sub-Neptune on a 17 day orbit around a bright (V=9.9mag) solar-like G3 V star with a mass and radius of M*=1.00±0.03M☉ and R*=1.09±0.03R☉, respectively. We modeled simultaneously the K2 photometry and CARMENES spectroscopic data and derived a radius of Rp=2.63–0.10+0.12R⊕ and mass of Mp=24.5–4.4+4.4M⊕, yielding a mean density of ρp=7.4–1.5+1.6g/cm3, which makes it one of the densest sub-Neptunian planets known to date. We also detected a linear trend in the radial velocities of K2-292 (dγ/dtRV=-0.40–0.07+0.07m/s/d) that suggests a long-period companion with a minimum mass on the order of 33M⊕. If confirmed, it would support a formation scenario of K2-292 b by migration caused by Kozai-Lidov oscillations.

Abstract Copyright: © ESO 2019

Journal keyword(s): planetary systems - techniques: photometric - techniques: radial velocities - techniques: high angular resolution - stars: individual: HD 119130 - stars: individual: K2-292

VizieR on-line data: <Available at CDS (J/A+A/623/A114): table1.dat>

Simbad objects: 5

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Number of rows : 5
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 119130 PM* 13 41 30.3033490344 -09 56 45.879437004   10.576 9.917 10.02 9.545 G3V 25 0
2 HD 119130b Pl 13 41 30.3033490344 -09 56 45.879437004           ~ 26 0
3 K2-110b Pl 13 49 23.8898803200 -12 17 04.123044132           ~ 35 0
4 K2-66 * 22 06 06.4020754080 -10 42 41.421424716   12.805 12.124     ~ 25 0
5 K2-66b Pl 22 06 06.4020754080 -10 42 41.421424716           ~ 23 0

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