K2-141 b: A 5-M⊕ super-Earth transiting a K7 V star every 6.7 hours
Artikel i vetenskaplig tidskrift, 2018

We report on the discovery of K2-141 b (EPIC 246393474 b), an ultra-short-period super-Earth on a 6.7 h orbit transiting an active K7 V star based on data from K2 campaign 12. We confirmed the planet's existence and measured its mass with a series of follow-up observations: seeing-limited Muscat imaging, NESSI high-resolution speckle observations, and FIES and HARPS high-precision radial-velocity monitoring. K2-141 b has a mass of 5.31 ± 0.46 M ⊗ and radius of 1.54 -0.09 +0.10 R ⊗ , yielding a mean density of 8.00 -1.45 +1.83 g cm -3 and suggesting a rocky-iron composition. Models indicate that iron cannot exceed ∼70% of the total mass. With an orbital period of only 6.7 h, K2-141 b is the shortest-period planet known to date with a precisely determined mass.

Planets and satellites: individual: EPIC 246393474 b

Stars: individual: EPIC 246393474

Techniques: photometric

Techniques: radial velocities

Planetary systems

Stars: fundamental parameters

Författare

O. Barragán

Universita degli Studi di Torino

D. Gandolfi

Universita degli Studi di Torino

Fei Dai

Princeton University

Massachusetts Institute of Technology (MIT)

J.H. Livingston

University of Tokyo

Carina Persson

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

T. Hirono

Tokyo Institute of Technology

Norio Narita

University of Tokyo

National Institutes of Natural Sciences

National Institutes of Natural Sciences - National Astronomical Observatory of Japan

Szilard Csizmadia

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

J. N. Winn

Princeton University

David Nespral

Universidad de la Laguna

Instituto Astrofisico de Canarias

J. Prieto-Arranz

Universidad de la Laguna

Instituto Astrofisico de Canarias

Alexis M. S. Smith

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

G. Nowak

Universidad de la Laguna

Instituto Astrofisico de Canarias

Simon Albrecht

Aarhus Universitet

Giuliano Antoniciello

Universita degli Studi di Torino

A.B. Justesen

Aarhus Universitet

J. Cabrera

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

William D. Cochran

The University of Texas at Austin

H. Deeg

Universidad de la Laguna

Instituto Astrofisico de Canarias

P. Eigmüller

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

M. Endl

The University of Texas at Austin

Anders Erikson

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

Malcolm Fridlund

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

Universiteit Leiden

A. Fukui

National Institutes of Natural Sciences - National Astronomical Observatory of Japan

S. Grziwa

Universität zu Köln

E. W. Guenther

Thüringer Landessternwarte Tautenburg

A. Hatzes

Thüringer Landessternwarte Tautenburg

D. Hidalgo

Instituto Astrofisico de Canarias

Universidad de la Laguna

M.C. Johnson

Ohio State University

Judith Korth

Universität zu Köln

E. Palle

Instituto Astrofisico de Canarias

Universidad de la Laguna

Martin Pätzold

Universität zu Köln

H. Rauer

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

Technische Universität Berlin

Yusuke Tanaka

University of Tokyo

Vincent Van Eylen

Universiteit Leiden

Astronomy and Astrophysics

0004-6361 (ISSN) 1432-0746 (eISSN)

Vol. 612 A95

Exoplaneter från rymden - CHEOPS och PLATO

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

Ämneskategorier

Astronomi, astrofysik och kosmologi

Geofysik

Multidisciplinär geovetenskap

DOI

10.1051/0004-6361/201732217

Mer information

Senast uppdaterat

2018-10-12