K2-141 b: A 5-M⊕ super-Earth transiting a K7 V star every 6.7 hours
Journal article, 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: fundamental parameters

Techniques: photometric

Stars: individual: EPIC 246393474

Techniques: radial velocities

Planetary systems

Author

O. Barragán

University of Turin

D. Gandolfi

University of Turin

Fei Dai

Massachusetts Institute of Technology (MIT)

Princeton University

J.H. Livingston

University of Tokyo

Carina Persson

Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics, Galactic Astrophysics

T. Hirono

Tokyo Institute of Technology

Norio Narita

University of Tokyo

National Institutes of Natural Sciences

National Astronomical Observatory of Japan

Szilard Csizmadia

German Aerospace Center (DLR)

J. N. Winn

Princeton University

David Nespral

Instituto Astrofisico de Canarias

University of La Laguna

J. Prieto-Arranz

University of La Laguna

Instituto Astrofisico de Canarias

Alexis M. S. Smith

German Aerospace Center (DLR)

G. Nowak

University of La Laguna

Instituto Astrofisico de Canarias

Simon Albrecht

Aarhus University

Giuliano Antoniciello

University of Turin

A.B. Justesen

Aarhus University

J. Cabrera

German Aerospace Center (DLR)

William D. Cochran

The University of Texas at Austin

H. Deeg

University of La Laguna

Instituto Astrofisico de Canarias

P. Eigmüller

German Aerospace Center (DLR)

M. Endl

The University of Texas at Austin

Anders Erikson

German Aerospace Center (DLR)

Malcolm Fridlund

Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics

Leiden University

A. Fukui

National Astronomical Observatory of Japan

S. Grziwa

University of Cologne

E. W. Guenther

Thüringer Landessternwarte Tautenburg

A. Hatzes

Thüringer Landessternwarte Tautenburg

D. Hidalgo

Instituto Astrofisico de Canarias

University of La Laguna

M.C. Johnson

Ohio State University

Judith Korth

University of Cologne

E. Palle

University of La Laguna

Instituto Astrofisico de Canarias

Martin Pätzold

University of Cologne

H. Rauer

German Aerospace Center (DLR)

Technische Universität Berlin

Yusuke Tanaka

University of Tokyo

Vincent Van Eylen

Leiden University

Astronomy and Astrophysics

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

Vol. 612 A95

Exoplanets from space – CHEOPS and PLATO, ESA’s next two projects

Swedish National Space Board, 2017-01-01 -- 2022-12-31.

Subject Categories

Astronomy, Astrophysics and Cosmology

Geophysics

Geosciences, Multidisciplinary

DOI

10.1051/0004-6361/201732217

More information

Latest update

9/10/2019