K2-98b : A 32 M _⊕ NEPTUNE-SIZE PLANET in A 10 DAY ORBIT TRANSITING AN F8 STAR

Summary, in English

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.

• Author: Oscar Barragán; Sascha Grziwa; Davide Gandolfi; Malcolm Fridlund; Michael Endl; Hans J. Deeg; Manuel P. Cagigal; Antonino F. Lanza; Pier G.Prada Moroni; Alexis M.S. Smith; Judith Korth; Megan Bedell; Juan Cabrera; William D. Cochran; Felice Cusano; Szilard Csizmadia; Philipp Eigmüller; Anders Erikson; Eike W. Guenther; Artie P. Hatzes; David Nespral; Martin Pätzold; Jorge Prieto-Arranz; Heike Rauer
• Publishing year: 2016-12
• Language: English
• Publication/Series: Astronomical Journal
• Volume: 152
• Issue: 6
• Links: http://dx.doi.org/10.3847/0004-6256/152/6/193
• Document type: Journal article
• Publisher: IOP Publishing
• Keywords: planets and satellites: detection; planets and satellites: individual K2-98b (EPIC 211391664b); stars: fundamental parameters
• Status: Published
• ISBN/ISSN/Other: ISSN: 0004-6256