The Discovery and Mass Measurement of a New Ultra-short-period Planet: K2-131
Artikel i vetenskaplig tidskrift, 2017
We report the discovery of a new ultra-short-period planet and summarize the properties of all such planets for which the mass and radius have been measured. The new planet, EPIC 228732031b, was discovered in K2 Campaign 10. It has a radius of 1.81-0.12+0.16 R_Earth and orbits a G dwarf with a period of 8.9 hr. Radial velocities obtained with Magellan/PFS and TNG/HARPS-N show evidence for stellar activity along with orbital motion. We determined the planetary mass using two different methods: (1) the “floating chunk offset” method, based only on changes in velocity observed on the same night; and (2) a Gaussian process regression based on both the radial velocity and photometric time series. The results are consistent and lead to a mass measurement of 6.5+/- 1.6 M_Earth and a mean density of 6.0-2.7+3.0 g cm‑3.
planetary systems
stars: individual: EPIC 228732031
Författare
F. Dai
Princeton University
Massachusetts Institute of Technology (MIT)
N. Joshua
Princeton University
D. Gandolfi
Universita degli Studi di Torino
S. Wangm
Carnegie Institution of Washington
J.K. Teske
Carnegie Observatories
J. Burt
Massachusetts Institute of Technology (MIT)
S. Albrecht
Aarhus Universitet
O. Barragán
Universita degli Studi di Torino
William D. Cochran
The University of Texas at Austin
M. Endl
The University of Texas at Austin
Malcolm Fridlund
Astronomi och plasmafysik
Artie P. Hatzes
Thüringer Landessternwarte Tautenburg
T. Hirano
Tokyo Institute of Technology
L.A. Hirsch
University of California
M.C. Johnson
Ohio State University
A.B. Justesen
Aarhus Universitet
J. Livingston
University of Tokyo
Carina Persson
Astronomi och plasmafysik
J. Prieto-Arranz
Universidad de la Laguna
Instituto de Astrofísica de Canarias
A. Vanderburg
Harvard-Smithsonian Center for Astrophysics
R. Alonso
Universidad de la Laguna
Instituto de Astrofísica de Canarias
G. Antoniciello
Universita degli Studi di Torino
P. Arriagada
Carnegie Institution of Washington
R.P. Butler
Carnegie Institution of Washington
J. Cabrera
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
J.D. Crane
Carnegie Observatories
F. Cusano
Osservatorio Astronomico Di Bologna
S. Csizmadia
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
H. Deeg
Universidad de la Laguna
Instituto de Astrofísica de Canarias
S.B. Dieterich
Carnegie Institution of Washington
P. Eigmüller
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
A. Erikson
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
M.E. Everett
National Optical Astronomy Observatory
Fukui A.
National Astronomical Observatory of Japan
S. Grziwa
Universität zu Köln
E. W. Guenther
Thüringer Landessternwarte Tautenburg
G.W. Henry
Tennessee State University
S.B. Howell
NASA Ames Research Center
J.A. Johnson
Harvard-Smithsonian Center for Astrophysics
J. Korth
Universität zu Köln
M. Kuzuhara
National Astronomical Observatory of Japan
National Institutes of Natural Sciences
N. Narita
National Astronomical Observatory of Japan
University of Tokyo
National Institutes of Natural Sciences
D. Nespral
Instituto de Astrofísica de Canarias
Universidad de la Laguna
G. Nowak
Instituto de Astrofísica de Canarias
Universidad de la Laguna
E. Palle
Universidad de la Laguna
Instituto de Astrofísica de Canarias
M. Patzold
Universität zu Köln
H. Rauer
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
Technische Universität Berlin
P. Montanés Rodríguez
Universidad de la Laguna
Instituto de Astrofísica de Canarias
S.A. Shectman
Carnegie Observatories
A. M S Smith
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
I.B. Thompson
Carnegie Observatories
V. Van Eylen
Universiteit Leiden
M.W. Williamson
Tennessee State University
R.A. Wittenmyer
University of Southern Queensland
Astronomical Journal
0004-6256 (ISSN) 1538-3881 (eISSN)
Vol. 154 6 226- 226Exoplaneter från rymden - CHEOPS och PLATO, ESA's nästa två missioner
Rymdstyrelsen (174/18), 2017-01-01 -- 2022-12-31.
Ämneskategorier
Astronomi, astrofysik och kosmologi
Fundament
Grundläggande vetenskaper
Infrastruktur
Onsala rymdobservatorium
DOI
10.3847/1538-3881/aa9065