Radial velocity confirmation of K2-100b: A young, highly irradiated, and low-density transiting hot Neptune
Journal article, 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
Author
O. Barragán
University of Oxford
S. Aigrain
University of Oxford
D. Kubyshkina
Institut fur Weltraumforschung
D. Gandolfi
University of Turin
J.H. Livingston
University of Tokyo
Malcolm Fridlund
Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics, Galactic Astrophysics
Leiden University
L. Fossati
Institut fur Weltraumforschung
Judith Korth
University of Cologne
H. Parviainen
Instituto Astrofisico de Canarias
University of La Laguna
L. Malavolta
Osservatorio Astrofisico di Catania
E. Palle
Instituto Astrofisico de Canarias
University of La Laguna
H. Deeg
University of La Laguna
Instituto Astrofisico de Canarias
G. Nowak
University of La Laguna
Instituto Astrofisico de Canarias
V. M. Rajpaul
University of Cambridge
N. Zicher
University of Oxford
Giuliano Antoniciello
University of Padua
Norio Narita
National Astronomical Observatory of Japan
Instituto Astrofisico de Canarias
Japan Science and Technology Agency
National Institutes of Natural Sciences
Simon Albrecht
Aarhus University
L. R. Bedin
Osservatorio Astronomico di Padova
J. Cabrera
German Aerospace Center (DLR)
William D. Cochran
The University of Texas at Austin
Jerome P. De Leon
University of Tokyo
P. Eigmüller
German Aerospace Center (DLR)
A. Fukui
University of Tokyo
V. Granata
University of Padua
S. Grziwa
University of Cologne
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
University of La Laguna
Instituto Astrofisico de Canarias
P. M. Rodriguez
University of La Laguna
Instituto Astrofisico de Canarias
F. Murgas
University of La Laguna
Instituto Astrofisico de Canarias
D. Nardiello
University of Padua
I. Pagano
Osservatorio Astrofisico di Catania
Giampaolo P. Piotto
University of Padua
Carina Persson
Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics, Galactic Astrophysics
Leiden University
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 1 698-708Exoplanets from space – CHEOPS and PLATO, ESA’s next two projects
Swedish National Space Board, 2017-01-01 -- 2022-12-31.
Subject Categories
Medical Laboratory and Measurements Technologies
Astronomy, Astrophysics and Cosmology
Signal Processing
Roots
Basic sciences
Infrastructure
Onsala Space Observatory
DOI
10.1093/mnras/stz2569