期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 497, 期 4, 页码 4423-4435出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/staa2077
关键词
techniques: photometric; techniques: radial velocities; techniques: spectroscopic; planets and satellites: detection; stars: individual: (EPIC 216494238, K2-280)
资金
- Spanish Ministry of Economy and Competitiveness (MINECO) [ESP2016-80435-C2-1-R, ESP2016-80435-C2-2-R]
- Spanish Ministry
- Ramon y Cajal fellowship [RYC-2015-17697]
- UK Science and Technology Facilities Council (STFC) [ST/S000488/1, ST/R004846/1]
- Swedish National Space Agency [DNR 163/16, 174/18]
- Deutsche Forschungsgemeinschaft (DFG) within the DFG Schwerpunkt [PA525/18-1, PA525/19-1, PA525/20-1, HA 3279/12-1, RA 714/14-1, SPP 1992]
- JSPS KAKENHI [JP18H01265, JP18H05439, JP16K17660]
- JST PRESTO [JPMJPR1775]
- FONDECYT [3180246, 1171208]
- Ministry for the Economy, Development, and Tourism's Programa Iniciativa Cientifica Milenio [IC 120009]
- European Organisation for Astronomical Research in the Southern Hemisphere under ESO programmes [097.C-0571(B), 097.C-0948(A), 098.C-0860(A), 099.C-0491(A), 0101.C-0407(A), 60.A-9700(G)]
- Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofisica de Canarias [A33TAC 15, OPT17A 64, CAT17A 91, CAT19A 97]
- NASA Science Mission directorate
- STFC [ST/S000488/1, ST/S000216/1] Funding Source: UKRI
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 R-b = 7.50 +/- 0.44 R-circle plus and a mass of M-b = 37.1 +/- 5.6 M-circle plus, yielding a mean density of rho(b) = 0.48(-0.10)(+0.13) g cm(-3). The host star is a mildly evolved G7 star with an effective temperature of T-eff = 5500 +/- 100 K, a surface gravity of log g(star) = 4.21 +/- 0.05 (cgs), and an iron abundance of [Fe/H] = 0.33 +/- 0.08 dex, and with an inferred mass of M-star = 1.03 +/- 0.03 M-circle dot and a radius of R-star = 1.28 +/- 0.07 R-circle dot. 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.
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