K2-98b: A 32 M ⊕ Neptune-Siza Planet in a 10 Day Orbit Transiting an F8 Star
Journal article, 2016
We report the discovery of K2-98b (EPIC 211391664b), a transiting Neptune-size planet monitored by the K2 mission during its Campaign 5. We combine the K2 time-series data with ground-based photometric and spectroscopic follow-up observations to confirm the planetary nature of the object and derive its mass, radius, and orbital parameters. K2-98b is a warm Neptune-like planet in a 10 day orbit around a V = 12.2 mag F-type star with M ? = 1.074 ±0.042 M o, R ? = R o, and age of . We derive a planetary mass and radius of M p = 32.2 ±8.1 M ? and R p = R ?. K2-98b joins the relatively small group of Neptune-size planets whose mass and radius have been derived with a precision better than 25%. We estimate that the planet will be engulfed by its host star in ?3 Gyr, due to the evolution of the latter toward the red giant branch.
stars: fundamental parameters
planets and satellites: individual K2-98b (EPIC 211391664b)
planets and satellites: detection
Author
Oscar Barragán
University of Turin
Sascha Grziwa
University of Cologne
Davide Gandolfi
Heidelberg-Königstuhl State Observatory
University of Turin
Malcolm Fridlund
Chalmers, Earth and Space Sciences, Radio Astronomy and Astrophysics
Michael Endl
The University of Texas at Austin
H. J. Deeg
University of La Laguna
Instituto de Astrofísica de Canarias
Manuel P. Cagigal
University of Cantabria
Antonino F. Lanza
Istituto nazionale di astrofisica (INAF)
Pier G Prada Moroni
University of Pisa
National Institute for Nuclear Physics
A. M S Smith
German Aerospace Center (DLR)
Judith Korth
University of Cologne
Megan Bedell
University of Chicago
Juan Cabrera
German Aerospace Center (DLR)
William D. Cochran
The University of Texas at Austin
Felice Cusano
Istituto nazionale di astrofisica (INAF)
Szilard Csizmadia
German Aerospace Center (DLR)
Philipp Eigmüller
German Aerospace Center (DLR)
Anders Erikson
German Aerospace Center (DLR)
Eike W. Guenther
Thüringer Landessternwarte Tautenburg
Artie P. Hatzes
Thüringer Landessternwarte Tautenburg
David Nespral
University of La Laguna
Instituto de Astrofísica de Canarias
Martin Pätzold
University of Cologne
Jorge Prieto-Arranz
University of La Laguna
Instituto de Astrofísica de Canarias
Heike Rauer
Technische Universität Berlin
German Aerospace Center (DLR)
Astronomical Journal
0004-6256 (ISSN) 1538-3881 (eISSN)
Vol. 152 6 Art. no. 193- 193Subject Categories (SSIF 2011)
Astronomy, Astrophysics and Cosmology
DOI
10.3847/0004-6256/152/6/193