Data di Pubblicazione:
2020
Abstract:
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 log g = 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.
Tipologia CRIS:
03A-Articolo su Rivista
Keywords:
K2-280); planets and satellites: detection; stars: individual: (EPIC 216494238; techniques: photometric; techniques: radial velocities; techniques: spectroscopic
Elenco autori:
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.; Alonso Sobrino R.; 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.; Subjak J.
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