K2-280 b - a low density warm sub-Saturn around a mildly evolved star
Artikel i vetenskaplig tidskrift, 2020

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.

planets and satellites: detection

techniques: radial velocities

stars: individual: (EPIC 216494238, K2-280)

techniques: photometric

techniques: spectroscopic

Författare

Grzegorz Nowak

IAC Instituto de Astrofísica de Canarias

Universidad de la Laguna

Enric Palle

IAC Instituto de Astrofísica de Canarias

Universidad de la Laguna

Davide Gandolfi

Universita degli Studi di Torino

Hans J. Deeg

IAC Instituto de Astrofísica de Canarias

Universidad de la Laguna

Teruyuki Hirano

Tokyo Institute of Technology

Oscar Barragan

University of Oxford

Universita degli Studi di Torino

Masayuki Kuzuhara

National Institutes of Natural Sciences

Fei Dai

Massachusetts Institute of Technology (MIT)

Princeton University

Rafael Luque

Universidad de la Laguna

IAC Instituto de Astrofísica de Canarias

Carina Persson

Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik, Galaktisk astrofysik

Malcolm Fridlund

Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik, Galaktisk astrofysik

Marshall C. Johnson

Las Cumbres Observatory Global Telescope Network, Inc

Judith Korth

Universität zu Köln

John H. Livingston

University of Tokyo

Sascha Grziwa

Universität zu Köln

Savita Mathur

Universidad de la Laguna

IAC Instituto de Astrofísica de Canarias

Artie P. Hatzes

Thüringer Landessternwarte Tautenburg

Jorge Prieto-Arranz

Universidad de la Laguna

IAC Instituto de Astrofísica de Canarias

David Nespral

IAC Instituto de Astrofísica de Canarias

Universidad de la Laguna

Diego Hidalgo

Universidad de la Laguna

IAC Instituto de Astrofísica de Canarias

Maria Hjorth

Aarhus Universitet

Simon Albrecht

Aarhus Universitet

Vincent Van Eylen

Princeton University

Kristine W. F. Lam

Technische Universität Berlin

William D. Cochran

The University of Texas at Austin

Massimiliano Esposito

Thüringer Landessternwarte Tautenburg

Szilard Csizmadia

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

Eike W. Guenther

Thüringer Landessternwarte Tautenburg

Petr Kabath

Czech Academy of Sciences

Pere Blay

Valencian Int Univ VIU

Rafael Brahm

Universidad Adolfo Ibanez

Millennium Institute of Astrophysics

Andres Jordan

Universidad Adolfo Ibanez

Millennium Institute of Astrophysics

Nestor Espinoza

Max-Planck-Gesellschaft

Felipe Rojas

Pontificia Universidad Catolica de Chile

Millennium Institute of Astrophysics

Nuria Casasayas Barris

IAC Instituto de Astrofísica de Canarias

Universidad de la Laguna

Florian Rodler

European Southern Observatory Santiago

Roi Alonso Sobrino

IAC Instituto de Astrofísica de Canarias

Universidad de la Laguna

J. Cabrera

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

Ilaria Carleo

Wesleyan University

Alexander Chaushev

Technische Universität Berlin

Jerome de Leon

University of Tokyo

Philipp Eigmueller

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

Michael Endl

The University of Texas at Austin

Anders Erikson

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

Akihiko Fukui

National Institutes of Natural Sciences

Iskra Georgieva

Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik, Galaktisk astrofysik

Lucia Gonzalez-Cuesta

Universidad de la Laguna

IAC Instituto de Astrofísica de Canarias

Emil Knudstrup

Aarhus Universitet

Mikkel N. Lund

Aarhus Universitet

Pilar Montanes Rodriguez

Universidad de la Laguna

IAC Instituto de Astrofísica de Canarias

Felipe Murgas

Universidad de la Laguna

IAC Instituto de Astrofísica de Canarias

Norio Narita

National Institutes of Natural Sciences

IAC Instituto de Astrofísica de Canarias

Japan Science and Technology Agency

Prajwal Niraula

Massachusetts Institute of Technology (MIT)

Martin Paetzold

Universität zu Köln

Heike Rauer

Technische Universität Berlin

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

Seth Redfield

Wesleyan University

Ignasi Ribas

Consejo Superior de Investigaciones Científicas (CSIC)

Institut d'Estudis Espacials de Catalunya (IEEC)

Marek Skarka

Masarykova Univerzita

Czech Academy of Sciences

Alexis M. S. Smith

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

Jano Subjak

Univerzita Karlova

Czech Academy of Sciences

Monthly Notices of the Royal Astronomical Society

0035-8711 (ISSN) 1365-2966 (eISSN)

Vol. 497 4 4423-4435

Ämneskategorier

Astronomi, astrofysik och kosmologi

Annan geovetenskap och miljövetenskap

Materialkemi

DOI

10.1093/mnras/staa2077

Mer information

Senast uppdaterat

2020-12-04