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K2-98b: A 32 M Neptune-size Planet in a 10 Day Orbit Transiting an F8 Star
- Publication Year :
- 2016
-
Abstract
- We report the discovery of K2-98 b (EPIC 211391664 b), a transiting Neptune-sized 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. K2-98 b is a warm Neptune-like planet in a 10-day orbit around a V=12.2~mag F-type star with $M_\star$=$ 1.074\pm0.042$, $R_\star$=$ 1.311 ^{+ 0.083} _{ - 0.048} $, and age of $5.2_{-1.0}^{+1.2}$~Gyr. We derive a planetary mass and radius of $M_\mathrm{p}$=$ 32.2 \pm 8.1 $ and $R_\mathrm{p}$=$4.3^{+0.3}_{-0.2}$. K2-98 b joins the relatively small group of Neptune-sized planets whose both 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 $\sim$3~Gyr, due to the evolution of the latter towards the red giant branch.<br />11 pages, 4 figures, Accepted for publication in AJ
- Subjects :
- planets and satellites: detection
Star (game theory)
FOS: Physical sciences
Astrophysics
Astrophysics::Cosmology and Extragalactic Astrophysics
01 natural sciences
Planet
Neptune
0103 physical sciences
Astrophysics::Solar and Stellar Astrophysics
planets and satellites: individual K2-98b (EPIC 211391664b)
stars: fundamental parameters
Astronomy and Astrophysics
Space and Planetary Science
010303 astronomy & astrophysics
Solar and Stellar Astrophysics (astro-ph.SR)
Astrophysics::Galaxy Astrophysics
Orbital elements
Physics
Earth and Planetary Astrophysics (astro-ph.EP)
010308 nuclear & particles physics
Radius
Red-giant branch
Orbit
planets and satellites: detection | planets and satellites: individual: EPIC 211391664b | stars: fundamental parameters
Astrophysics - Solar and Stellar Astrophysics
13. Climate action
Astrophysics::Earth and Planetary Astrophysics
Planetary mass
Astrophysics - Earth and Planetary Astrophysics
Subjects
Details
- Language :
- German
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....5867dd7403970e27d2de39beff3f55d5