K2-264: a transiting multiplanet system in the Praesepe open cluster
Artikel i vetenskaplig tidskrift, 2019

Planet host stars with well-constrained ages provide a rare window to the time domain of planet formation and evolution. The NASA K2 mission has enabled the discovery of the vast majority of known planets transiting stars in clusters, providing a valuable sample of planets with known ages and radii. We present the discovery of two planets transiting K2-264, an M2 dwarf in the intermediate age (600-800 Myr) Praesepe open cluster (also known as the Beehive Cluster, M44, or NGC 2632), which was observed by K2 during Campaign 16. The planets have orbital periods of 5.8 and 19.7 d, and radii of 2.2 ± 0.2 and 2.7 ± 0.2R⊕, respectively, and their equilibrium temperatures are 496 ± 10 and 331 ± 7 K, making this a system of two warm sub-Neptunes. When placed in the context of known planets orbiting field stars of similar mass to K2-264, these planets do not appear to have significantly inflated radii, as has previously been noted for some cluster planets. As the second known system of multiple planets transiting a star in a cluster, K2-264 should be valuable for testing theories of photoevaporation in systems of multiple planets. Follow-up observations with current near-infrared (NIR) spectrographs could yield planet mass measurements, which would provide information about the mean densities and compositions of small planets soon after photoevaporation is expected to have finished. Follow-up NIR transit observations using Spitzer or large ground-based telescopes could yield improved radius estimates, further enhancing the characterization of these interesting planets.

techniques: photometric

planets and satellites: detection

techniques: high angular resolution

Författare

J. Livingston

University of Tokyo

JSPS

F. Dai

Massachusetts Institute of Technology (MIT)

Princeton University

T. Hirano

Tokyo Institute of Technology

D. Gandolfi

Universita degli Studi di Torino

A. A. Trani

University of Tokyo

JSPS

G. Nowak

Universidad de la Laguna

Instituto Astrofisico de Canarias

W. D. Cochran

The University of Texas at Austin

M. Endl

The University of Texas at Austin

S. Albrecht

Aarhus Universitet

O. Barragan

Universita degli Studi di Torino

J. Cabrera

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

Sz. Csizmadia

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

J. P. de Leon

University of Tokyo

H. Deeg

Instituto Astrofisico de Canarias

Universidad de la Laguna

Ph Eigmüller

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

Technische Universität Berlin

A. Erikson

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

Malcolm Fridlund

Chalmers, Rymd-, geo- och miljövetenskap, Onsala rymdobservatorium

Universiteit Leiden

A. Fukui

Instituto Astrofisico de Canarias

National Astronomical Observatory of Japan

S. Grziwa

Universität zu Köln

E. W. Guenther

Thüringer Landessternwarte Tautenburg

A. P. Hatzes

Thüringer Landessternwarte Tautenburg

J. Korth

Universität zu Köln

M. Kuzuhara

National Astronomical Observatory of Japan

National Institutes of Natural Sciences

P. Montañes

Instituto Astrofisico de Canarias

Universidad de la Laguna

N. Narita

National Institutes of Natural Sciences

University of Tokyo

National Astronomical Observatory of Japan

Instituto Astrofisico de Canarias

D. Nespral

Instituto Astrofisico de Canarias

Universidad de la Laguna

E. Palle

Instituto Astrofisico de Canarias

Universidad de la Laguna

M. Pätzold

Universität zu Köln

Carina Persson

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

J. Prieto-Arranz

Universidad de la Laguna

Instituto Astrofisico de Canarias

H. Rauer

Technische Universität Berlin

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

Freie Universität Berlin

M. Tamura

National Institutes of Natural Sciences

National Astronomical Observatory of Japan

University of Tokyo

V. Van Eylen

Universiteit Leiden

J. N. Winn

Princeton University

Monthly Notices of the Royal Astronomical Society

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

Vol. 484 1 8-18

Exoplaneter från rymden - CHEOPS och PLATO

Rymdstyrelsen, 2017-01-01 -- 2022-12-31.

Ämneskategorier

Astronomi, astrofysik och kosmologi

Fundament

Grundläggande vetenskaper

Infrastruktur

Onsala rymdobservatorium

DOI

10.1093/mnras/sty3464

Mer information

Senast uppdaterat

2019-07-16