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 1 698-708

Exoplanets 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

More information

Latest update

12/3/2019