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

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Published in

Astronomical Journal

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

Vol. 152 Issue 6 p. Art. no. 193- art. no 193

Categorizing

Subject Categories (SSIF 2011)

Astronomy, Astrophysics and Cosmology

Identifiers

DOI

10.3847/0004-6256/152/6/193

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3/28/2025