Two Hot Jupiters from K2 Campaign 4

Abstract

We confirm the planetary nature of two transiting hot Jupiters discovered by the Kepler spacecraft's K2 extended mission in its Campaign 4, using precise radial velocity measurements from FIES@NOT, HARPS-N@TNG, and the coudé spectrograph on the McDonald Observatory 2.7 m telescope. K2-29 b (EPIC 211089792 b) transits a K1V star with a period of $3.2589263\pm 0.0000015$ days; its orbit is slightly eccentric ($e=0.084_{-0.023}^{+0.032}$). It has a radius of $R_P=1.000_{-0.067}^{+0.071}$ $R_J$ and a mass of $M_P=0.613_{-0.026}^{+0.027}$ $M_J$. Its host star exhibits significant rotational variability, and we measure a rotation period of $P_{\mathrm{rot}}=10.777\pm 0.031$ days. K2-30 b (EPIC 210957318 b) transits a G6V star with a period of $4.098503\pm 0.000011$ days. It has a radius of $R_P=1.039_{-0.051}^{+0.050}$ $R_J$ and a mass of $M_P=0.579_{-0.027}^{+0.028}$ $M_J$. The star has a low metallicity for a hot Jupiter host, $[\mathrm{Fe}/\mathrm{H}]=-0.15\pm 0.05$.

Accepted for publication in AJ. 11 pages, 3 figures

References in corpus (18)

• A grid of MARCS model atmospheres for late-type stars I. Methods and general properties
• The K2 Mission: Characterization and Early results
• Dynamical Outcomes of Planet-Planet Scattering
• EXOFAST: A fast exoplanetary fitting suite in IDL
• A Technique for Extracting Highly Precise Photometry for the Two-Wheeled Kepler Mission
• Measuring the rotation period distribution of field M-dwarfs with Kepler
• SOPHIE velocimetry of Kepler transit candidates XVII. The physical properties of giant exoplanets within 400 days of period
• Determining stellar macroturbulence using asteroseismic rotational velocities from Kepler
• The Exoplanet Orbit Database II: Updates to exoplanets.org
• Planetary Candidates from the First Year of the K2 Mission
• Hot Jupiters from Coplanar High-eccentricity Migration
• Steady-state planet migration by the Kozai-Lidov mechanism in stellar binaries
• The mass of the Mars-sized exoplanet Kepler-138 b from transit timing
• A comparison of gyrochronological and isochronal age estimates for transiting exoplanet host stars
• Kepler423b: a half-Jupiter mass planet transiting a very old solar-like star
• A study of the performance of the transit detection tool DST in space-based surveys. Application of the CoRoT pipeline to Kepler data
• Three planets orbiting Wolf 1061
• Interplay of tidal evolution and stellar wind braking in the rotation of stars hosting massive close-in planets

Cited by in corpus (21)

• Transit Least Squares: Optimized transit detection algorithm to search for periodic transits of small planets
• 197 Candidates and 104 Validated Planets in K2's First Five Fields
• Evidence of an Upper Bound on the Masses of Planets and its Implications for Giant Planet Formation
• ExoClock Project III: 450 new exoplanet ephemerides from ground and space observations
• K2-141 b: A 5-M${}_{\oplus }$ super-Earth transiting a K7 V star every 6.7 hours
• K2-106, a system containing a metal-rich planet and a planet of lower density
• Three Small Super-Earths Transiting the nearby star GJ 9827
• ExoClock project II: A large-scale integrated study with 180 updated exoplanet ephemerides
• K2-260 b: a hot Jupiter transiting an F star, and K2-261 b: a warm Saturn around a bright G star
• EPIC 210894022b - A short period super-Earth transiting a metal poor, evolved old star
• HD219666b: A hot-Neptune from TESS Sector 1
• ExoClock Project: An open platform for monitoring the ephemerides of Ariel targets with contributions from the public
• The TROY project: Searching for co-orbital bodies to known planets. I. Project goals and first results from archival radial velocity
• EPIC211089792 b: an aligned and inflated hot jupiter in a young visual binary
• K2-98 b: A 32-M${}_{\oplus }$ Neptune-sized planet in a 10-day orbit transiting an F8 star
• K2-140b and K2-180b - Characterization of a hot Jupiter and a mini-Neptune from the K2 mission
• K2-60b and epic 216468514b. A sub-jovian and a jovian planet from the k2 mission
• EPIC 228735255b - An eccentric 6.57 day transiting hot Jupiter in Virgo
• TOI-2046b, TOI-1181b and TOI-1516b, three new hot Jupiters from \textit{TESS}: planets orbiting a young star, a subgiant and a normal star
• K2-30b and K2-34b: two inflated hot-Jupiters around Solar-type stars
• Search for Exoplanetary Transits in the Galactic Bulge