Authors

Fei Dai, Massachusetts Institute of TechnologyFollow
Joshua N. Winn, Princeton UniversityFollow
Davide Gandolfi, Universitá di TorinoFollow
Sharon X. Wang, Carnegie Institution for ScienceFollow
Johanna K. Teske, The Observatories of the Carnegie Institution for ScienceFollow
Jennifer Burt, Massachusetts Institute of TechnologyFollow
Simon Albrecht, Aarhus University
Oscar Barragán, Universitá di TorinoFollow
William D. Cochran, University of Texas at AustinFollow
Michael Endl, University of Texas at AustinFollow
Malcolm Fridlund, University of Leiden
Artie P. Hatzes, Thüringer Landessternwarte TautenburgFollow
Teruyuki Hirano, Tokyo Institute of Technology
Lea A. Hirsch, University of California - BerkeleyFollow
Marshall C. Johnson, The Ohio State UniversityFollow
Anders Bo Justesen, Aarhus University
John Livingston, University of TokyoFollow
Carina M. Persson, Chalmers University of Technology
Jorge Prieto-Arranz, Instituto de Astrofísica de Canarias
Andrew Vanderburg, Harvard-Smithsonian Center for AstrophysicsFollow
Roi Alonso, Instituto de Astrofísica de CanariasFollow
Giuliano Antoniciello, Universitá di Torin
Pamela Arriagada, Carnegie Institution for ScienceFollow
R. Paul Butler, Carnegie Institution for ScienceFollow
Juan Cabrera, German Aerospace Center
Jeffrey D. Crane, The Observatories of the Carnegie Institution for ScienceFollow
Felice Cusano, Osservatorio Astronomico di Bologna
Szilárd Csizmadia, German Aerospace Center
Hans Deeg, Instituto de Astrofísica de CanariasFollow
Sergio B. Dieterich, Carnegie Institution for Science
Philipp Eigmüller, German Aerospace Center
Anders Erikson, German Aerospace Center
Mark E. Everett, National Optical Astronomy ObservatoryFollow
Akihiko Fukui, National Astronomical Observatory of Japan
Sascha Grziwa, Rheinisches Institut für Umweltforschung an der Universität zu Köln
Eike W. Guenther, Thüringer Landessternwarte Tautenburg
Gregory W. Henry, Tennessee State UniversityFollow
Steve B. Howell, NASA Ames Research CenterFollow
John Asher Johnson, Harvard-Smithsonian Center for AstrophysicsFollow
Judith Korth, Rheinisches Institut für Umweltforschung an der Universität zu Köln
Masayuki Kuzuhara, Astrobiology Center
Norio Narita, University of TokyoFollow
David Nespral, Instituto de Astrofísica de Canarias
Grzegorz Nowak, Instituto de Astrofísica de Canarias
Enric Palle, Instituto de Astrofísica de Canarias
Martin Pätzold, Rheinisches Institut für Umweltforschung an der Universität zu Köln
Heike Rauer, German Aerospace Center
Pilar Montañés Rodríguez, Instituto de Astrofísica de Canarias
Stephen A. Shectman, The Observatories of the Carnegie Institution for ScienceFollow
Alexis M. S. Smith, German Aerospace Center
Ian B. Thompson, The Observatories of the Carnegie Institution for Science
Vincent Van Eylen, University of Leiden
Michael W. Williamson, Tennessee State UniversityFollow
Robert A. Wittenmyer, University of Southern QueenslandFollow

Document Type

Article

Publication Date

11-14-2017

Abstract

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, K2-131b, was discovered in K2 Campaign 10. It has a radius of ${1.81}_{-0.12}^{+0.16}\,{R}_{\oplus }$ 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 $6.5\pm 1.6\,{M}_{\oplus }$ and a mean density of ${6.0}_{-2.7}^{+3.0}$ g cm−3.

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