2019MNRAS.482.1807K

Query : 2019MNRAS.482.1807K

2019MNRAS.482.1807K - Mon. Not. R. Astron. Soc., 482, 1807-1823 (2019/January-2)

K2-140b and K2-180b - Characterization of a hot Jupiter and a mini-Neptune from the K2 mission.

KORTH J., CSIZMADIA S., GANDOLFI D., FRIDLUND M., PATZOLD M., HIRANO T., LIVINGSTON J., PERSSON C.M., DEEG H.J., JUSTESEN A.B., BARRAGAN O., GRZIWA S., ENDL M., TRONSGAARD R., DAI F., COCHRAN W.D., ALBRECHT S., ALONSO R., CABRERA J., CAULEY P.W., CUSANO F., EIGMULLER P., ERIKSON A., ESPOSITO M., GUENTHER E.W., HATZES A.P., HIDALGO D., KUZUHARA M., MONTANES P., NAPOLITANO N.R., NARITA N., NIRAULA P., NESPRAL D., NOWAK G., PALLE E., PETRILLO C.E., REDFIELD S., PRIETO-ARRANZ J., RAUER H., SMITH A.M.S., TORTORA C., VAN EYLEN V. and WINN J.N.

Abstract (from CDS):

We report the independent discovery and characterization of two K2 planets: K2-180b, a mini-Neptune-sized planet in an 8.9-d orbit transiting a V = 12.6 mag, metal-poor ([Fe/H] = -0.65 ± 0.10) K2V star in K2 campaign 5; K2-140b, a transiting hot Jupiter in a 6.6-d orbit around a V = 12.6 mag G6V ([Fe/H] = + 0.10 ± 0.10) star in K2 campaign 10. Our results are based on K2 time-series photometry combined with high-spatial resolution imaging and high-precision radial velocity measurements. We present the first mass measurement of K2-180b. K2-180b has a mass of Mp = 11.3 ± 1.9 M⊕ and a radius of Rp = 2.2 ± 0.1 R⊕, yielding a mean density of ρp = 5.6 ± 1.9 g cm–3, suggesting a rocky composition. Given its radius, K2-180b is above the region of the so-called 'planetary radius gap'. K2-180b is in addition not only one of the densest mini-Neptune-sized planets, but also one of the few mini-Neptune-sized planets known to transit a metal-poor star. We also constrain the planetary and orbital parameters of K2-140b and show that, given the currently available Doppler measurements, the eccentricity is consistent with zero, contrary to the results of a previous study.

Abstract Copyright: © 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): techniques: photometric - techniques: radial velocities - stars: individual: K2-140 - stars: individual: K2-180 - planets and satellites: fundamental parameters - stars: fundamental parameters

Simbad objects: 11

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Number of rows : 11
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 3765 PM* 00 40 49.2698857963 +40 11 13.823048636   8.30   6.8   K2V 281 0
2 CoRoT-21 * 06 44 12.6302250707 -00 17 56.987010804   16.66 15.84 15.61 14.99 G8V 15 1
3 * 37 Gem * 06 55 18.6663587832 +25 22 32.503553004   6.343 5.748     G0V 246 0
4 K2-180b Pl 08 25 51.3437842728 +10 14 49.060473144           ~ 18 0
5 K2-180 PM* 08 25 51.3437842728 +10 14 49.060473144   13.33 12.60 12.468   ~ 20 0
6 SDSS J082551.72+101441.1 * 08 25 51.7285747896 +10 14 41.045902368           ~ 1 0
7 SDSS J082551.85+101451.8 * 08 25 51.8605364784 +10 14 52.014527844           ~ 1 0
8 K2-140b Pl 12 32 32.9633051376 -09 36 27.497115648           ~ 27 0
9 K2-140 * 12 32 32.9633051376 -09 36 27.497115648   13.35 12.62 12.75 11.87 G5 30 0
10 K2-110b Pl 13 49 23.8898803200 -12 17 04.123044132           ~ 35 0
11 HD 175607 PM* 19 01 05.4891158652 -66 11 33.640381347   9.31 8.61     G6V 86 0

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