Exoplanets & Exomoons

Kepler-730: A Hot Jupiter System with a Close-in, Transiting, Earth-sized Planet

By Keith Cowing
Press Release
December 20, 2018
Filed under
Kepler-730: A Hot Jupiter System with a Close-in, Transiting, Earth-sized Planet
Transiting Earth Sized Planet

Kepler-730 is a planetary system hosting a statistically validated hot Jupiter in a 6.49-day orbit and an additional transiting candidate in a 2.85-day orbit.

We use spectroscopic radial velocities from the APOGEE-2N instrument, Robo-AO contrast curves, and Gaia distance estimates to statistically validate the planetary nature of the additional Earth-sized candidate. We perform astrophysical false positive probability calculations for the candidate using the available Kepler data and bolster the statistical validation by using radial velocity data to exclude a family of possible binary star solutions.

Using a radius estimate for the primary star derived from stellar models, we compute radii of 1.100+0.047−0.050 RJup and 0.140±0.012 RJup (1.57±0.13 R⊕) for Kepler-730b and Kepler-730c, respectively. Kepler-730 is only the second compact system hosting a hot Jupiter with an inner, transiting planet.

Caleb I. Cañas, Songhu Wang, Suvrath Mahadevan, Chad F. Bender, Nathan De Lee, Scott W. Fleming, D. A. García-Hernández, Fred R. Hearty, Steven R. Majewski, Alexandre Roman-Lopes, Donald P. Schneider, Keivan G. Stassun
(Submitted on 20 Dec 2018)

Comments: 13 pages, 2 figures, 3 tables, accepted for publication in ApJL
Subjects: Earth and Planetary Astrophysics (astro-ph.EP)
Cite as: arXiv:1812.08358 [astro-ph.EP] (or arXiv:1812.08358v1 [astro-ph.EP] for this version)
Submission history
From: Caleb Cañas
[v1] Thu, 20 Dec 2018 04:52:09 UTC (976 KB)

Explorers Club Fellow, ex-NASA Space Station Payload manager/space biologist, Away Teams, Journalist, Lapsed climber, Synaesthete, Na’Vi-Jedi-Freman-Buddhist-mix, ASL, Devon Island and Everest Base Camp veteran, (he/him) 🖖🏻