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K2-280 b – a low density warm sub-Saturn around a mildly evolved star

Nowak, Grzegorz and Palle, Enric and Gandolfi, Davide and Deeg, Hans J. and Hirano, Teruyuki and Barragan, 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, Szilard 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 Perez, Juan and Carleo, Ilaria and Chaushev, Alexander and de Leon, Jerome P and Eigmüller, Philipp and Endl, Michael and Erikson, Anders and Fukui, Akihiko and Georgieva, Iskra and Gonzalez-Cuesta, Lucia and Knudstrup, Emil and Lund, Mikkel N. and Montanes Rodriguez, 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, Jano (2020) K2-280 b – a low density warm sub-Saturn around a mildly evolved star. Monthly Notices of the Royal Astronomical Society, 497 (4), pp. 4423-4435. Oxford University Press. doi: 10.1093/mnras/staa2077. ISSN 0035-8711.

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Official URL: https://academic.oup.com/mnras/article/497/4/4423/5873020

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+0.05−0.04 ) 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+0.13−0.10 gcm−3. The host star is a mildly evolved G7 star with an effective temperature of Teff = 5500 ± 100 K, a surface gravity of logg⋆ = 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.

Item URL in elib:https://elib.dlr.de/137499/
Document Type:Article
Title:K2-280 b – a low density warm sub-Saturn around a mildly evolved star
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Nowak, GrzegorzInstituto de Astrofísica de Canarias, C/ Vía Láctea s/n, E-38205 La Laguna, SpainUNSPECIFIED
Palle, EnricInstituto de Astrofísica de Canarias (IAC), Tenerife, Spain; Departamento de Astrofísica, Universidad de La Laguna (ULL), Tenerife, SpainUNSPECIFIED
Gandolfi, DavideDipartimento di Fisica, Universita degli Studi di Torino, via Pietro Giuria 1, I-10125, Torino, Italy ); 0000-0001-8627-9628UNSPECIFIED
Deeg, Hans J.Instituto de Astrofisica de Canarias, C/ Via Lactea s/n, E-38205 La Laguna, Spain ; Departamento de Astrofisica, Universidad de La Laguna, E-38206 La Laguna, Spain 0000-0003-0047-4241UNSPECIFIED
Hirano, TeruyukiDepartment of Earth and Planetary Sciences, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8551, Japan);UNSPECIFIED
Barragan, OscarOxford Astrophysics, Department of Physics, University of Oxford, Denys Wilkinson Building, Keble Road, Oxford OX1 3RH, UKUNSPECIFIED
Kuzuhara, MasayukiAstrobiology Center, NINS, 2-21-1 Osawa, Mitaka, Tokyo 181–8588, JapanUNSPECIFIED
Dai, FeiDepartment of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA 02139, USA ; Department of Astrophysical Sciences, Princeton University, 4 Ivy Lane, Princeton, NJ 08544, USAUNSPECIFIED
Luque, RafaelInstituto de Astrofisica de Canarias, C/ Via Lactea s/n, E-38205 La Laguna, Spain; Departamento de Astrofisica, Universidad de La Laguna, E-38206 La Laguna, SpainUNSPECIFIED
Persson, Carina M.Department of Space, Earth and Environmanet, Chalmers University of Technology, Onsala space Observatory, SE-439 92 Onsala SwedenUNSPECIFIED
Fridlund, MalcolmDepartment of Space, Earth and Environment, Chalmers University of Technology, Onsala Space Observatory, SE-439 92 Onsala, Sweden ; Leiden Observatory, University of Leiden, PO Box 9513, 2300 RA, Leiden, The Netherlands 0000-0003-2180-9936UNSPECIFIED
Johnson, Marshall C.Department of Astronomy, The Ohio State University, 140 West 18th Ave., Columbus, OH 43210, USAUNSPECIFIED
Korth, JudithRheinisches Institut fur Umweltforschung an der Universitat zu Koln, Aachener Strasse 209, D-50931 Koln, GermanyUNSPECIFIED
Livingston, John H.Department of Astronomy, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan 0000-0002-4881-3620UNSPECIFIED
Grziwa, SaschaRheinisches Institut für Umweltforschung an der Universität zu Köln, Aachener Strasse 209, D-50931 Köln, GermanyUNSPECIFIED
Mathur, SavitaInstituto de Astrofisica de Canarias, C/ Via Lactea s/n, E-38205 La Laguna, Spain; Departamento de Astrofisica, Universidad de La Laguna, E-38206 La Laguna, SpainUNSPECIFIED
Hatzes, Artie P.Thuringer Landessternwarte Tautenburg, Sternwarte 5, D-07778 Tautenberg, GermanyUNSPECIFIED
Prieto-Arranz, JorgeInstituto de Astrofisica de Canarias, C/ Via Lactea s/n, E-38205 La Laguna, Spain; Departamento de Astrofisica, Universidad de La Laguna, E-38206 La Laguna, SpainUNSPECIFIED
Nespral, DavidInstituto de Astrofisica de Canarias, C/ Via Lactea s/n, E-38205 La Laguna, Spain; Departamento de Astrofisica, Universidad de La Laguna, E-38206 La Laguna, SpainUNSPECIFIED
Hidalgo, DiegoInstituto de Astrofisica de Canarias, C/ Via Lactea s/n, E-38205 La Laguna, SpainUNSPECIFIED
Hjorth, MariaStellar Astrophysics Centre, Dep. of Physics and Astronomy, Aarhus University, Ny Munkegade 120, DK-8000 Aarhus C, DenmarkUNSPECIFIED
Albrecht, SimonStellar Astrophysics Centre, Dep. of Physics and Astronomy, Aarhus University, Ny Munkegade 120, DK-8000 Aarhus C, DenmarkUNSPECIFIED
Van Eylen, VincentDepartment of Astrophysical Sciences, Princeton University, 4 Ivy Lane, Princeton, NJ 08544, USAUNSPECIFIED
Lam, Kristine W.~F.Center for Astronomy and Astrophysics, TU Berlin, Hardenbergstr. 36,D-10623 Berlin, GermanyUNSPECIFIED
Cochran, William D.Department of Astronomy and McDonald Observatory, University of Texas at Austin, 2515 Speedway, Stop C1400, Austin, TX 78712, USA 0000-0001-9662-3496UNSPECIFIED
Esposito, MassimilianoThuringer Landessternwarte Tautenburg, Sternwarte 5, D-07778 Tautenberg, GermanyUNSPECIFIED
Csizmadia, Szilardszilard.csizmadia (at) dlr.deUNSPECIFIED
Guenther, Eike W.Thuringer Landessternwarte Tautenburg, Sternwarte 5, D-07778 Tautenberg, GermanyUNSPECIFIED
Kabath, PetrAstronomical Institute, Czech Academy of Sciences, Fricova 298, 25165, Ondrejov, Czech Republic 0000-0002-1623-5352UNSPECIFIED
Blay, PereValencian International University (VIU), Pintor Sorolla 21, E-46002Valencia, SpainUNSPECIFIED
Brahm, RafaelCenter of Astro-Engineering UC, Pontificia Universidad Católica de Chile, Av. Vicuña Mackenna 4860, 7820436 Macul, Santiago, Chile; Millennium Institute for Astrophysics, Santiago,ChileUNSPECIFIED
Jordán, AndrésMillennium Institute for Astrophysics, Santiago,Chile; Facultad de Ingeniería y Ciencias, Universidad Adolfo Ibáñez, Av. Diagonal las Torres 2640, Peñalolén, Santiago, ChileUNSPECIFIED
Espinoza, NéstorSpace Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USAUNSPECIFIED
Rojas, FelipeMillennium Institute for Astrophysics, Chile; Instituto de Astrofísica, Facultad de Física, Pontificia Universidad Católica de Chile, ChileUNSPECIFIED
Casasayas Barris, NúriaInstituto de Astrof ́ısica de Canarias (IAC), E-38205 La Laguna, Tenerife,SpainUNSPECIFIED
Rodler, FlorianEuropean Southern Observatory, Alonso de C ́ordova 3107, Vitacura,Casilla 19001, Santiago de Chile, ChileUNSPECIFIED
Alonso Sobrino, RoiInstituto de Astrof ́ısica de Canarias (IAC), E-38205 La Laguna, Tenerife,SpainUNSPECIFIED
Cabrera Perez, JuanJuan.Cabrera (at) dlr.dehttps://orcid.org/0000-0001-6653-5487
Carleo, IlariaAstronomy Department and Van Vleck Observatory, Wesleyan University,Middletown, CT 06459, USAUNSPECIFIED
Chaushev, AlexanderCenter for Astronomy and Astrophysics, TU Berlin, Hardenbergstr. 36, 10623 Berlin, GermanyCenter for Astronomy and Astrophysics, TU Berlin, GermanyUNSPECIFIED
de Leon, Jerome PDepartment of Astronomy, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, JapanUNSPECIFIED
Eigmüller, PhilippPhilipp.Eigmueller (at) dlr.dehttps://orcid.org/0000-0003-4096-0594
Endl, MichaelDepartment of Astronomy and McDonald Observatory, University of Texas at Austin, 2515 Speedway, Stop C1400, Austin, TX 78712, USAUNSPECIFIED
Erikson, Andersanders.erikson (at) dlr.deUNSPECIFIED
Fukui, AkihikoSubaru Telescope Okayama Branch Office, National Astronomical Observatory of Japan, NINS, 3037-5 Honjo, Kamogata, Asakuchi, Okayama 719-0232, Japan ; Instituto de Astrofísica de Canarias, C/ Vía Láctea, s/n, 38205 La Laguna, SpainUNSPECIFIED
Georgieva, IskraChalmers University of Technology, Department of Space, Earth andEnvironment, Onsala Space Observatory, SE-439 92 Onsala, SwedenUNSPECIFIED
Gonzalez-Cuesta, LuciaInstituto de Astrofisica de Canarias, C/ Via Lactea s/n, E-38205 La Laguna, Spain ; Departamento de Astrofisica, Universidad de La Laguna, E-38206 La Laguna, SpainUNSPECIFIED
Knudstrup, EmilStellar Astrophysics Centre, Dep. of Physics and Astronomy, Aarhus University, Ny Munkegade 120, DK-8000 Aarhus C, DenmarkUNSPECIFIED
Lund, Mikkel N.Stellar Astrophysics Centre, Department of Physics and Astronomy, AarhusUniversity, Ny Munkegade 120, DK-8000 Aarhus C, DenmarkUNSPECIFIED
Montanes Rodriguez, PilarInstituto de Astrofisica de Canarias, C/ Via Lactea s/n, E-38205 La Laguna, Spain; Departamento de Astrofisica, Universidad de La Laguna, E-38206 La Laguna, SpainUNSPECIFIED
Murgas, FelipeInstituto de Astrof ́ısica de Canarias (IAC), E-38205 La Laguna, Tenerife,SpainUNSPECIFIED
Narita, NorioDepartment of Astronomy, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan; Instituto de Astrofisica de Canarias, C/ Via Lactea s/n, E-38205 La Laguna, Spain; Astrobiology Center, NINS, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan ; NationUNSPECIFIED
Niraula, PrajwalDepartment of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139, USA 0000-0002-8052-3893UNSPECIFIED
Pätzold, MartinRheinisches Institut fur Umweltforschung an der Universitat zu Köln, Aachener Strasse 209, D-50931 Koln, GermanyUNSPECIFIED
Rauer, Heikeheike.rauer (at) dlr.deUNSPECIFIED
Redfield, SethAstronomy Department and Van Vleck Observatory, Wesleyan University, Middletown, CT 06459, USA 0000-0003-3786-3486UNSPECIFIED
Ribas, IgnasiInstitut de Ciencies de l'Espai (ICE, CSIC), Campus UAB, C/ de Can Magrans s/n, E-08193 Bellaterra, Spain ; Institut d'Estudis Espacials de Catalunya (IEEC), C/ Gran Capita 2-4, E-08034 Barcelona, Spain 0000-0002-6689-0312UNSPECIFIED
Skarka, MarekAstronomical Institute, Czech Academy of Sciences, Fricova 298, 25165, Ondrejov, Czech Republic; Department of Theoretical Physics and Astrophysics, Masaryk University, Kotlarska 2, 61137 Brno, Czech Republic 0000-0002-7602-0046UNSPECIFIED
Smith, Alexis M.~S.alexis.smith (at) dlr.deUNSPECIFIED
Subjak, JanoAstronomical Institute, Czech Academy of Sciences, Friˇcova 298, CZ-25165Ondˇrejov, Czech RepublicUNSPECIFIED
Date:July 2020
Journal or Publication Title:Monthly Notices of the Royal Astronomical Society
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:497
DOI :10.1093/mnras/staa2077
Page Range:pp. 4423-4435
Publisher:Oxford University Press
ISSN:0035-8711
Status:Published
Keywords:techniques: photometric, techniques: radial velocities, techniques: spectroscopic, planets and satellites: detection, stars: individual: (EPIC 216494238, K2-280), Astrophysics - Earth and Planetary Astrophysics, Astrophysics - Solar and Stellar Astrophysics
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Space Exploration
DLR - Research theme (Project):R - Project PLATO (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Extrasolar Planets and Atmospheres
Institute of Planetary Research > Leitungsbereich PF
Deposited By: Csizmadia, Szilard
Deposited On:16 Nov 2020 12:58
Last Modified:16 Nov 2020 12:58

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