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Kepler-730 is a planetary system hosting a statistically validated hotJupiter in a 6.49-day orbit and an additional transiting candidate in a2.85-day orbit. We use spectroscopic radial velocities from the APOGEE-2Ninstrument, Robo-AO contrast curves, and Gaia distance estimates tostatistically validate the planetary nature of the additional Earth-sizedcandidate. We perform astrophysical false positive probability calculations forthe candidate using the available Kepler data and bolster the statisticalvalidation by using radial velocity data to exclude a family of possible binarystar solutions. Using a radius estimate for the primary star derived fromstellar models, we compute radii of $1.100^{+0.047}_{-0.050}\ R_{Jup}$ and$0.140\pm0.012\ R_{Jup}$ ($1.57\pm0.13\ R_{\oplus}$) for Kepler-730b andKepler-730c, respectively. Kepler-730 is only the second compact system hostinga hot Jupiter with an inner, transiting planet.

Kepler-730: A hot Jupiter system with a close-in, transiting, Earth-sized planet