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

Abstract

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 $1.100_{-0.050}^{+0.047}{R}_{Jup}$ and $0.140\pm 0.012R_{Jup}$ ($1.57\pm 0.13R_{\oplus }$) for Kepler-730b and Kepler-730c, respectively. Kepler-730 is only the second compact system hosting a hot Jupiter with an inner, transiting planet.

13 pages, 2 figures, 3 tables, published in ApJL

References in corpus (9)

• The 2.5 m Telescope of the Sloan Digital Sky Survey
• Target Selection for the SDSS-IV APOGEE-2 Survey
• Kepler constraints on planets near hot Jupiters
• Hot Jupiters from Coplanar High-eccentricity Migration
• Kepler Multi-Planet Systems Exhibit Unexpected Intra-system Uniformity in Mass and Radius
• Cross-Correlation and Maximum Likelihood Analysis: A New Approach to Combine Cross-Correlation Functions
• The Joker: A custom Monte Carlo sampler for binary-star and exoplanet radial velocity data
• Stellar Spin-Orbit Alignment for Kepler-9, a Multi-transiting Planetary system with Two Outer Planets Near 2:1 Resonance
• The APOGEE Spectroscopic Survey of Kepler Planet Hosts: Feasibility, Efficiency, and First Results

Cited by in corpus (20)

• Evidence for Hidden Nearby Companions to Hot Jupiters
• A Possible Alignment Between the Orbits of Planetary Systems and their Visual Binary Companions
• A new dynamical modeling of the WASP-47 system with CHEOPS observations
• In situ formation of hot Jupiters with companion super-Earths
• An eccentric Brown Dwarf eclipsing an M dwarf
• TOI-1408: Discovery and Photodynamical Modeling of a Small Inner Companion to a Hot Jupiter Revealed by TTVs
• Revisiting WASP-47 with ESPRESSO and TESS
• Characterisation of the Warm-Jupiter TOI-1130 system with CHEOPS and photo-dynamical approach
• TOI-150: A transiting hot Jupiter in the TESS southern CVZ
• A High-Eccentricity Warm Jupiter Orbiting TOI-4127
• A collage of small planets from the Lick Carnegie Exoplanet Survey : Exploring the super-Earth and sub-Neptune mass regime
• Architecture Classification for Extrasolar Planetary Systems
• A close outer companion to the ultra-hot Jupiter TOI-2109 b?
• Evidence for Primordial Alignment II: Insights from Stellar Obliquity Measurements for Hot Jupiters in Compact Multiplanet Systems
• Migration and Evolution of giant ExoPlanets (MEEP) II: Super-Jupiters and Lithium-rich Host Stars
• Confirmation of four hot Jupiters detected by TESS using follow-up spectroscopy from MaHPS at Wendelstein together with NEID and TRES
• Synchrotron emitting Komissarov torus with magnetic polarization around Kerr black holes
• TOI-2458 b: A mini-Neptune consistent with in situ hot Jupiter formation
• Characterization of low-mass companions to $\text{Kepler}$ objects of interest observed with APOGEE-N
• A Homogeneous Catalog of Rossiter-McLaughlin Systems: Distinct $e$-$\lambda$ Trends in Three Gas-Giant Mass Regimes