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

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

S. Albrecht

Aarhus Universitet

O. Barragán

Universita degli Studi di Torino

William D. Cochran

University of Texas at Austin

M. Endl

University of Texas at Austin

Malcolm Fridlund

Astronomi och plasmafysik

Artie P. Hatzes

Thuringer Landessternwarte Tautenburg

T. Hirano

Tokyo Institute of Technology

L.A. Hirsch

UC Berkeley

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 Astrofisico de Canarias

A. Vanderburg

Harvard-Smithsonian Center for Astrophysics

R. Alonso

Universidad de la Laguna

Instituto Astrofisico 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 Zentrum fur Luft- Und Raumfahrt

J.D. Crane

Carnegie Observatories

F. Cusano

Osservatorio Astronomico Di Bologna

S. Csizmadia

Deutsches Zentrum fur Luft- Und Raumfahrt

H. Deeg

Universidad de la Laguna

Instituto Astrofisico de Canarias

S.B. Dieterich

Carnegie Institution of Washington

P. Eigmüller

Deutsches Zentrum fur Luft- Und Raumfahrt

A. Erikson

Deutsches Zentrum fur Luft- Und Raumfahrt

M.E. Everett

National Optical Astronomy Observatory

Fukui A.

National Institutes of Natural Sciences - National Astronomical Observatory of Japan

S. Grziwa

Universitat zu Koln

E. W. Guenther

Thuringer 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

Universitat zu Koln

M. Kuzuhara

National Institutes of Natural Sciences

National Institutes of Natural Sciences - National Astronomical Observatory of Japan

N. Narita

University of Tokyo

National Institutes of Natural Sciences - National Astronomical Observatory of Japan

National Institutes of Natural Sciences

D. Nespral

Universidad de la Laguna

Instituto Astrofisico de Canarias

G. Nowak

Instituto Astrofisico de Canarias

Universidad de la Laguna

E. Palle

Instituto Astrofisico de Canarias

Universidad de la Laguna

M. Patzold

Universitat zu Koln

H. Rauer

Technische Universitat Berlin

Deutsches Zentrum fur Luft- Und Raumfahrt

P. Montanés Rodríguez

Universidad de la Laguna

Instituto Astrofisico de Canarias

S.A. Shectman

Carnegie Observatories

A. M S Smith

Deutsches Zentrum fur Luft- Und Raumfahrt

I.B. Thompson

Carnegie Observatories

V. Van Eylen

Leiden Observatory Research Institute

M.W. Williamson

Tennessee State University

R.A. Wittenmyer

University of Southern Queensland

Astronomical Journal

0004-6256 (ISSN) 1538-3881 (eISSN)

Vol. 154 226- 226

Ämneskategorier

Astronomi, astrofysik och kosmologi

Fundament

Grundläggande vetenskaper

Infrastruktur

Onsala rymdobservatorium

DOI

10.3847/1538-3881/aa9065