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, Galaktisk astrofysik

Universiteit Leiden

L. Fossati

Institut fur Weltraumforschung

Judith Korth

Universität zu Köln

H. Parviainen

Instituto Astrofisico de Canarias

Universidad de la Laguna

L. Malavolta

Osservatorio Astrofisico di Catania

E. Palle

Instituto Astrofisico de Canarias

Universidad de la Laguna

H. Deeg

Universidad de la Laguna

Instituto Astrofisico de Canarias

G. Nowak

Universidad de la Laguna

Instituto Astrofisico 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 Astrofisico 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 Astrofisico de Canarias

P. M. Rodriguez

Universidad de la Laguna

Instituto Astrofisico de Canarias

F. Murgas

Universidad de la Laguna

Instituto Astrofisico 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, Galaktisk astrofysik

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 1 698-708

Exoplaneter från rymden - CHEOPS och PLATO

Rymdstyrelsen, 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

Mer information

Senast uppdaterat

2019-12-03