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

Articolo
Data di Pubblicazione:
2021
Abstract:
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 K6V 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 R-circle plus, and periods of 3.13 and 7.49 d for TOI-1260b and TOI-1260c, 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 = and M-c = M-circle plus. 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-circle plus range.
Tipologia CRIS:
03A-Articolo su Rivista
Keywords:
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
Elenco autori:
Georgieva, IY; Persson, CM; Barragán, O; Nowak, G; Fridlund, M; Locci, D; Palle, E; Luque, R; Carleo, I; Gandolfi, D; Kane, SR; Korth, J; Stassun, KG; Livingston, J; Matthews, EC; Collins, KA; Howell, SB; Serrano, LM; Albrecht, S; Bieryla, A; Brasseur, CE; Ciardi, D; Cochran, WD; Colon, KD; Crossfield, IJM; Csizmadia, S; Deeg, HJ; Esposito, M; Furlan, E; Gan, T; Goffo, E; Gonzales, E; Grziwa, S; Guenther, EW; Guerra, P; Hirano, T; Jenkins, JM; Jensen, ELN; Kabáth, P; Knudstrup, E; Lam, KWF; Latham, DW; Levine, AM; Matson, RA; McDermott, S; Osborne, HLM; Paegert, M; Quinn, SN; Redfield, S; Ricker, GR; Schlieder, JE; Scott, NJ; Seager, S; Smith, AMS; Tenenbaum, P; Twicken, JD; Vanderspek, R; Van Eylen, V; Winn, JN
Autori di Ateneo:
GANDOLFI Davide
Link alla scheda completa:
https://iris.unito.it/handle/2318/1948763
Link al Full Text:
https://iris.unito.it/retrieve/handle/2318/1948763/1221061/Georgieva_2021.pdf
Pubblicato in:
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Journal
Progetto:
GANDOLFI D. - Fondaz.CRT - II tornata 2018 - Rif. 2018.2323 - "Gaseous or rocky? Unveiling the nature of small worlds"
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Dati Generali

URL

https://academic.oup.com/mnras/article-abstract/505/4/4684/6280967?redirectedFrom=fulltext

Aree Di Ricerca

Settori (2)


PE9_3 - Exoplanetary science, formation and characterization of extrasolar planets - (2022)

SCIENZE MATEMATICHE, CHIMICHE, FISICHE - Cosmologia e Universo
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