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Georgieva, I Y; Persson, C M; Barragán, 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, Sz; 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; Kabáth, P; Schlieder, J E
Monthly notices of the Royal Astronomical Society, 08/2021, Letnik: 505, Številka: 4Journal Article
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 R(b) = 2.33 ± 0.10 and R(c) = 2.82 ± 0.15 Rꚛ, 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 M(b) = 8.6(+1.4,−1.5) and M(c) = 11.8(+3.4,−3.2) Mꚛ. 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 Rꚛ range.
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