2021MNRAS.505.4684G

Query : 2021MNRAS.505.4684G

2021MNRAS.505.4684G - Mon. Not. R. Astron. Soc., 505, 4684-4701 (2021/August-3)

Hot planets around cool stars - two short-period mini-Neptunes transiting the late K-dwarf TOI-1260.

GEORGIEVA I.Y., PERSSON C.M., BARRAGAN O., NOWAK G., FRIDLUND M., LOCCI D., PALLE E., LUQUE R., CARLEO I., GANDOLFI D., KANE S.R., KORTH J., STASSUN K.G., LIVINGSTON J., MATTHEWS E.C., COLLINS K.A., HOWELL S.B., SERRANO L.M., ALBRECHT S., BIERYLA A., BRASSEUR C.E., CIARDI D., COCHRAN W.D., COLON K.D., CROSSFIELD I.J.M., CSIZMADIA S., DEEG H.J., ESPOSITO M., FURLAN E., GAN T., GOFFO E., GONZALES E., GRZIWA S., GUENTHER E.W., GUERRA P., HIRANO T., JENKINS J.M., JENSEN E.L.N., KABATH P., KNUDSTRUP E., LAM K.W.F., LATHAM D.W., LEVINE A.M., MATSON R.A., McDERMOTT S., OSBORNE H.L.M., PAEGERT M., QUINN S.N., REDFIELD S., RICKER G.R., SCHLIEDER J.E., SCOTT N.J., SEAGER S., SMITH A.M.S., TENENBAUM P., TWICKEN J.D., VANDERSPEK R., VAN EYLEN V. and WINN J.N.

Abstract (from CDS):

We present the discovery and characterization of two sub-Neptunes in close orbits, as well as a tentative outer planet of a similar size, orbiting TOI-1260 - a low metallicity K6 V dwarf star. Photometry from Transiting Exoplanet Survey Satellite(TESS) yields radii of Rb = 2.33 ± 0.10 and Rc = 2.82 ± 0.15 R⊕, and periods of 3.13 and 7.49 d for TOI-1260 b and TOI-1260 c, respectively. We combined the TESS data with a series of ground-based follow-up observations to characterize the planetary system. From HARPS-N high-precision radial velocities we obtain Mb = 8.6_- 1.5_ ^+ 1.4^ and Mc = 11.8–3.2 ^+3.4 ^ M⊕. The star is moderately active with a complex activity pattern, which necessitated the use of Gaussian process regression for both the light-curve detrending and the radial velocity modelling, in the latter case guided by suitable activity indicators. We successfully disentangle the stellar-induced signal from the planetary signals, underlining the importance and usefulness of the Gaussian process approach. We test the system's stability against atmospheric photoevaporation and find that the TOI-1260 planets are classic examples of the structure and composition ambiguity typical for the 2-3 R⊕ range.

Abstract Copyright: © 2021 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society

Journal keyword(s): techniques: photometric - techniques: radial velocities - planets and satellites: atmospheres - planets and satellites: individual: TOI-1260b, c - planets and satellites: composition - stars: low-mass - planetary systems

Simbad objects: 6

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Number of rows : 6
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 SDSS J102834.90+655101.2 * 10 28 34.9124831074 +65 51 01.354776831           ~ 1 0
2 LP 62-217 PM* 10 28 35.0250921216 +65 51 16.381197180   13.351 11.973 11.649   ~ 21 0
3 NAME LP 62-217b Pl 10 28 35.0250921216 +65 51 16.381197180           ~ 11 0
4 NAME LP 62-217c Pl 10 28 35.0250921216 +65 51 16.381197180           ~ 7 0
5 UCAC4 780-023268 * 10 28 40.3012535516 +65 50 57.278941358   17.765 16.569 15.933   ~ 1 0
6 Ross 905b Pl 11 42 11.0933350978 +26 42 23.650782778           ~ 913 1

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