Radial velocity confirmation of K2-100b: A young, highly irradiated, and low-density transiting hot Neptune
Artikel i vetenskaplig tidskrift, 2019
We present a detailed analysis of HARPS-N radial velocity observations of K2-100, a young and active star in the Praesepe cluster, which hosts a transiting planet with a period of 1.7 d. We model the activity-induced radial velocity variations of the host star with a multidimensional Gaussian Process framework and detect a planetary signal of 10.6 ± 3.0 m s−1, which matches the transit ephemeris, and translates to a planet mass of 21.8 ± 6.2 M. We perform a suite of validation tests to confirm that our detected signal is genuine. This is the first mass measurement for a transiting planet in a young open cluster. The relatively low density of the planet, 2.04+−006661 g cm−3, implies that K2-100b retains a significant volatile envelope. We estimate that the planet is losing its atmosphere at a rate of 1011–1012 g s−1 due to the high level of radiation it receives from its host star.
Techniques: photometric
Techniques: radial velocities
Planets and satellites: individual: K2-100b
Författare
O. Barragán
University of Oxford
S. Aigrain
University of Oxford
D. Kubyshkina
Institut fur Weltraumforschung
D. Gandolfi
Universita degli Studi di Torino
J.H. Livingston
University of Tokyo
Malcolm Fridlund
Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik
Universiteit Leiden
L. Fossati
Institut fur Weltraumforschung
Judith Korth
Universität zu Köln
H. Parviainen
Instituto de Astrofísica de Canarias
Universidad de la Laguna
L. Malavolta
Osservatorio Astrofisico di Catania
E. Palle
Instituto de Astrofísica de Canarias
Universidad de la Laguna
H. Deeg
Universidad de la Laguna
Instituto de Astrofísica de Canarias
G. Nowak
Universidad de la Laguna
Instituto de Astrofísica de Canarias
V. M. Rajpaul
University of Cambridge
N. Zicher
University of Oxford
Giuliano Antoniciello
Università di Padova
Norio Narita
National Astronomical Observatory of Japan
Instituto de Astrofísica de Canarias
Japan Science and Technology Agency
National Institutes of Natural Sciences
Simon Albrecht
Aarhus Universitet
L. R. Bedin
Osservatorio Astronomico di Padova
J. Cabrera
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
William D. Cochran
The University of Texas at Austin
Jerome P. De Leon
University of Tokyo
P. Eigmüller
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
A. Fukui
University of Tokyo
V. Granata
Università di Padova
S. Grziwa
Universität zu Köln
E. W. Guenther
Thüringer Landessternwarte Tautenburg
A. Hatzes
Thüringer Landessternwarte Tautenburg
Nobuhiko Kusakabe
National Astronomical Observatory of Japan
National Institutes of Natural Sciences
D. W. Latham
Harvard-Smithsonian Center for Astrophysics
M. Libralato
Space Telescope Science Institute (STScI)
R. Luque
Universidad de la Laguna
Instituto de Astrofísica de Canarias
P. M. Rodriguez
Universidad de la Laguna
Instituto de Astrofísica de Canarias
F. Murgas
Universidad de la Laguna
Instituto de Astrofísica de Canarias
D. Nardiello
Università di Padova
I. Pagano
Osservatorio Astrofisico di Catania
Giampaolo P. Piotto
Università di Padova
Carina Persson
Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik
Universiteit Leiden
S. Redfield
Wesleyan University
Motohide Tamura
National Institutes of Natural Sciences
University of Tokyo
National Astronomical Observatory of Japan
Monthly Notices of the Royal Astronomical Society
0035-8711 (ISSN) 1365-2966 (eISSN)
Vol. 490 1 698-708Exoplaneter från rymden - CHEOPS och PLATO, ESA's nästa två missioner
Rymdstyrelsen (174/18), 2017-01-01 -- 2022-12-31.
Ämneskategorier
Medicinsk laboratorie- och mätteknik
Astronomi, astrofysik och kosmologi
Signalbehandling
Fundament
Grundläggande vetenskaper
Infrastruktur
Onsala rymdobservatorium
DOI
10.1093/mnras/stz2569