2020MNRAS.499.5004M

Query : 2020MNRAS.499.5004M

2020MNRAS.499.5004M - Mon. Not. R. Astron. Soc., 499, 5004-5021 (2020/December-3)

K2-111: an old system with two planets in near-resonance.

MORTIER A., ZAPATERO OSORIO M.R., MALAVOLTA L., ALIBERT Y., RICE K., LILLO-BOX J., VANDERBURG A., OSHAGH M., BUCHHAVE L., ADIBEKYAN V., DELGADO MENA E., LOPEZ-MORALES M., CHARBONNEAU D., SOUSA S.G., LOVIS C., AFFER L., ALLENDE PRIETO C., BARROS S.C.C., BENATTI S., BONOMO A.S., BOSCHIN W., BOUCHY F., CABRAL A., COLLIER CAMERON A., COSENTINO R., CRISTIANI S., DEMANGEON O.D.S., DI MARCANTONIO P., D'ODORICO V., DUMUSQUE X., EHRENREICH D., FIGUEIRA P., FIORENZANO A., GHEDINA A., GONZALEZ HERNANDEZ J.I., HALDEMANN J., HARUTYUNYAN A., HAYWOOD R.D., LATHAM D.W., LAVIE B., LO CURTO G., MALDONADO J., MANESCAU A., MARTINS C.J.A.P., MAYOR M., MEGEVAND D., MEHNER A., MICELA G., MOLARO P., MOLINARI E., NUNES N.J., PEPE F.A., PALLE E., PHILLIPS D., PIOTTO G., PINAMONTI M., PORETTI E., RIVA M., REBOLO R., SANTOS N.C., SASSELOV D., SOZZETTI A., SUAREZ MASCARENO A., UDRY S., WEST R.G., WATSON C.A. and WILSON T.G.

Abstract (from CDS):

This paper reports on the detailed characterization of the K2-111 planetary system with K2, WASP, and ASAS-SN photometry, as well as high-resolution spectroscopic data from HARPS-N and ESPRESSO. The host, K2-111, is confirmed to be a mildly evolved (log g = 4.17), iron-poor ([Fe/H] = -0.46), but alpha-enhanced ([α/Fe]=0.27), chromospherically quiet, very old thick disc G2 star. A global fit, performed by using PyORBIT, shows that the transiting planet, K2-111 b, orbits with a period Pb = 5.3518 ± 0.0004 d and has a planet radius of 1.82+0.11–0.09 R⊕ and a mass of 5.29+0.76–0.77 M⊕, resulting in a bulk density slightly lower than that of the Earth. The stellar chemical composition and the planet properties are consistent with K2-111 b being a terrestrial planet with an iron core mass fraction lower than the Earth. We announce the existence of a second signal in the radial velocity data that we attribute to a non-transiting planet, K2-111 c, with an orbital period of 15.6785 ± 0.0064 d, orbiting in near-3:1 mean motion resonance with the transiting planet, and a minimum planet mass of 11.3 ± 1.1 M⊕. Both planet signals are independently detected in the HARPS-N and ESPRESSO data when fitted separately. There are potentially more planets in this resonant system, but more well-sampled data are required to confirm their presence and physical parameters.

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: (K2-111)

VizieR on-line data: <Available at CDS (J/MNRAS/499/5004): tablerv.dat tablep1.dat tablep2.dat>

Simbad objects: 7

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Number of rows : 7
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 K2-111 PM* 03 59 33.5381228011 +21 17 55.244066403   11.80 11.14 11.003   ~ 36 0
2 EPIC 210894022 c Pl 03 59 33.5381228011 +21 17 55.244066403           ~ 2 0
3 K2-111b Pl 03 59 33.5381228011 +21 17 55.244066403           ~ 28 1
4 Cl Melotte 25 OpC 04 30 27.4 +16 46 43           ~ 3309 0
5 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
6 Kepler-10c Pl 19 02 43.0613892904 +50 14 28.701617339           ~ 135 1
7 * 51 Peg b Pl 22 57 27.9804852576 +20 46 07.797040104           ~ 744 1

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