2020MNRAS.497.4423N

Query : 2020MNRAS.497.4423N

2020MNRAS.497.4423N - Mon. Not. R. Astron. Soc., 497, 4423-4435 (2020/October-1)

K2-280 b - a low density warm sub-Saturn around a mildly evolved star.

NOWAK G., PALLE E., GANDOLFI D., DEEG H.J., HIRANO T., BARRAGAN O., KUZUHARA M., DAI F., LUQUE R., PERSSON C.M., FRIDLUND M., JOHNSON M.C., KORTH J., LIVINGSTON J.H., GRZIWA S., MATHUR S., HATZES A.P., PRIETO-ARRANZ J., NESPRAL D., HIDALGO D., HJORTH M., ALBRECHT S., VAN EYLEN V., LAM K.W.F., COCHRAN W.D., ESPOSITO M., CSIZMADIA S., GUENTHER E.W., KABATH P., BLAY P., BRAHM R., JORDAN A., ESPINOZA N., ROJAS F., CASASAYAS BARRIS N., RODLER F., SOBRINO R.A., CABRERA J., CARLEO I., CHAUSHEV A., DE LEON J., EIGMULLER P., ENDL M., ERIKSON A., FUKUI A., GEORGIEVA I., GONZALEZ-CUESTA L., KNUDSTRUP E., LUND M.N., MONTANES RODRIGUEZ P., MURGAS F., NARITA N., NIRAULA P., PATZOLD M., RAUER H., REDFIELD S., RIBAS I., SKARKA M., SMITH A.M.S. and SUBJAK J.

Abstract (from CDS):

We present an independent discovery and detailed characterization of K2-280 b, a transiting low density warm sub-Saturn in a 19.9-d moderately eccentric orbit (e = 0.35–0.04+0.05 ) from K2 campaign 7. A joint analysis of high precision HARPS, HARPS-N, and FIES radial velocity measurements and K2 photometric data indicates that K2-280 b has a radius of Rb = 7.50 ± 0.44 R⊕ and a mass of Mb = 37.1 ± 5.6 M⊕, yielding a mean density of ρb = 0.48_ - 0.10_ + 0.13 ^ g cm–3. The host star is a mildly evolved G7 star with an effective temperature of Teff = 5500 ± 100 K, a surface gravity of logg* = 4.21 ± 0.05 (cgs), and an iron abundance of [Fe/H] = 0.33 ±0.08 dex, and with an inferred mass of M* = 1.03 ± 0.03 M☉ and a radius of R* = 1.28 ± 0.07 R☉. We discuss the importance of K2-280 b for testing formation scenarios of sub-Saturn planets and the current sample of this intriguing group of planets that are absent in the Solar system.

Abstract Copyright: © 2020 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): techniques: photometric - techniques: radial velocities - techniques: spectroscopic - planets and satellites: detection - stars: individual: ((EPIC 216494238, K2-280))

Simbad objects: 12

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Number of rows : 12
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 WASP-156b Pl 02 11 07.6236440160 +02 25 04.878446484           K3 50 0
2 * 37 Gem * 06 55 18.6663587832 +25 22 32.503553004   6.343 5.748     G0V 246 0
3 NAME LP 424-4b Pl 07 59 05.8395356736 +15 23 29.236065000           ~ 387 1
4 HD 89345b Pl 10 18 41.0577180360 +10 07 44.501913660           ~ 40 0
5 Kepler-1656b Pl 18 57 53.3246033136 +39 54 42.531984144           ~ 52 0
6 Kepler-413 EB* 19 14 02.5619727768 +51 09 45.019100160           ~ 89 0
7 K2-280b Pl 19 26 22.8813846576 -22 14 51.550486620           ~ 15 0
8 K2-280 * 19 26 22.8813846576 -22 14 51.550486620   13.27 12.54 12.41   ~ 24 0
9 Gaia DR3 6772454206445987712 * 19 26 22.9400780208 -22 14 58.289445276           ~ 1 0
10 Kepler-47 EB* 19 41 11.4983203032 +46 55 13.707336288           ~ 185 1
11 K2-60b Pl 22 34 25.4865325464 -13 43 54.159635424           ~ 18 0
12 HD 219666b Pl 23 18 13.6298981445 -56 54 14.035920520           ~ 32 0

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