K2-280 b-a low density warm sub-Saturn around a mildly evolved star
(2020) In Monthly Notices of the Royal Astronomical Society 497(4). p.4423-4435- 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⊙.... (More)
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.
(Less)
- author
- publishing date
- 2020-10-01
- type
- Contribution to journal
- publication status
- published
- keywords
- K2-280), planets and satellites: detection, stars: individual: (EPIC 216494238, techniques: photometric, techniques: radial velocities, techniques: spectroscopic
- in
- Monthly Notices of the Royal Astronomical Society
- volume
- 497
- issue
- 4
- pages
- 13 pages
- publisher
- Oxford University Press
- external identifiers
-
- scopus:85097431153
- ISSN
- 0035-8711
- DOI
- 10.1093/mnras/staa2077
- language
- English
- LU publication?
- no
- additional info
- Funding Information: This work is partly supported by JSPS KAKENHI Grant Numbers JP18H01265, JP18H05439, and JP16K17660, and JST PRESTO Grant Number JPMJPR1775. RB acknowledges support from FONDECYT Postdoctoral Fellowship Project 3180246. AJ acknowledges support from FONDECYT project 1171208. Publisher Copyright: © 2020 The Author(s).
- id
- 0b87e8fb-e1a2-46ad-be9e-eeeb7008e71c
- date added to LUP
- 2023-02-01 10:41:24
- date last changed
- 2023-02-20 13:31:56
@article{0b87e8fb-e1a2-46ad-be9e-eeeb7008e71c,
abstract = {{<p>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.</p>}},
author = {{Nowak, Grzegorz and Palle, Enric and Gandolfi, Davide and Deeg, Hans J. and Hirano, Teruyuki and Barragán, Oscar and Kuzuhara, Masayuki and Dai, Fei and Luque, Rafael and Persson, Carina M. and Fridlund, Malcolm and Johnson, Marshall C. and Korth, Judith and Livingston, John H. and Grziwa, Sascha and Mathur, Savita and Hatzes, Artie P. and Prieto-Arranz, Jorge and Nespral, David and Hidalgo, Diego and Hjorth, Maria and Albrecht, Simon and Van Eylen, Vincent and Lam, Kristine W.F. and Cochran, William D. and Esposito, Massimiliano and Csizmadia, Szilárd and Guenther, Eike W. and Kabath, Petr and Blay, Pere and Brahm, Rafael and Jordán, Andrés and Espinoza, Néstor and Rojas, Felipe and Casasayas Barris, Núria and Rodler, Florian and Alonso Sobrino, Roi and Cabrera, Juan and Carleo, Ilaria and Chaushev, Alexander and De Leon, Jerome and Eigmüller, Philipp and Endl, Michael and Erikson, Anders and Fukui, Akihiko and Georgieva, Iskra and González-Cuesta, Lucía and Knudstrup, Emil and Lund, Mikkel N. and Montañes Rodríguez, Pilar and Murgas, Felipe and Narita, Norio and Niraula, Prajwal and Pätzold, Martin and Rauer, Heike and Redfield, Seth and Ribas, Ignasi and Skarka, Marek and Smith, Alexis M.S. and Subjak, Jan}},
issn = {{0035-8711}},
keywords = {{K2-280); planets and satellites: detection; stars: individual: (EPIC 216494238; techniques: photometric; techniques: radial velocities; techniques: spectroscopic}},
language = {{eng}},
month = {{10}},
number = {{4}},
pages = {{4423--4435}},
publisher = {{Oxford University Press}},
series = {{Monthly Notices of the Royal Astronomical Society}},
title = {{K2-280 b-a low density warm sub-Saturn around a mildly evolved star}},
url = {{http://dx.doi.org/10.1093/mnras/staa2077}},
doi = {{10.1093/mnras/staa2077}},
volume = {{497}},
year = {{2020}},
}