Revising Properties of Planet-host Binary Systems II: Apparent Near-Earth Analog Planets in Binaries Are Often Sub-Neptunes
arXiv:2208.07428 · doi:10.3847/1538-3881/ac89ed
Abstract
Identifying rocky planets in or near the habitable zones of their stars (near-Earth analogs) is one of the key motivations of many past and present planet-search missions. The census of near-Earth analogs is important because it informs calculations of the occurrence rate of Earth-like planets, which in turn feed into calculations of the yield of future missions to directly image other Earths. Only a small number of potential near-Earth analogs have been identified, meaning that each planet should be vetted carefully and then incorporated into the occurrence rate calculation. A number of putative near-Earth analogs have been identified within binary star systems. However, stellar multiplicity can bias measured planetary properties, meaning that apparent near-Earth analogs in close binaries may have different radii or instellations than initially measured. We simultaneously fit unresolved optical spectroscopy, optical speckle and near-infrared AO contrasts, and unresolved photometry, and retrieved revised stellar temperatures and radii for a sample of 11 binary Kepler targets that host at least one near-Earth analog planet, for a total of 17 planet candidates. We found that 10 of the 17 planets in our sample had radii that fell in or above the radius gap, suggesting that they are not rocky planets. Only 2 planets retained super-Earth radii and stayed in the habitable zone, making them good candidates for inclusion in rocky planet occurrence rate calculations.
Accepted to AJ. 11 pages + 1 appendix. The most up-to-date version of the analysis code is available at https://github.com/kendallsullivan/mcmc_spec
References in corpus (22)
- Array Programming with NumPy
- The Astropy Project: Sustaining and Growing a Community-oriented Open-source Project and the Latest Major Release (v5.0) of the Core Package
- Modules for Experiments in Stellar Astrophysics (MESA)
- New evolutionary models for pre-main sequence and main sequence low-mass stars down to the hydrogen-burning limit
- How to Constrain Your M Dwarf: measuring effective temperature, bolometric luminosity, mass, and radius
- Habitable Zones Around Main-Sequence Stars: Dependence on Planetary Mass
- Exoplanet population inference and the abundance of Earth analogs from noisy, incomplete catalogs
- The Kepler Follow-Up Observation Program. I. A Catalog of Companions to Kepler Stars from High-Resolution Imaging
- How to Characterize Habitable Worlds and Signs of Life
- The Gaia-Kepler Stellar Properties Catalog. II. Planet Radius Demographics as a Function of Stellar Mass and Age
- The Occurrence of Rocky Habitable Zone Planets Around Solar-Like Stars from Kepler Data
- A Statistical Reconstruction of the Planet Population Around Kepler Solar-Type Stars
- Correcting for Telluric Absorption: Methods, Case Studies, and Release of the TelFit Code
- Searching the Entirety of Kepler Data. II. Occurrence Rate Estimates for FGK Stars
- High-resolution Multi-band Imaging for Validation and Characterization of Small Kepler Planets
- Hubble Space Telescope High Resolution Imaging of Kepler Small and Cool Exoplanet Host Stars
- Adaptive Optics Images III: 87 Kepler Objects of Interest
- Unresolved Binary Exoplanet Host Stars Fit as Single Stars: Effects on the Stellar Parameters
- Revision of Earth-sized Kepler Planet Candidate Properties with High Resolution Imaging by Hubble Space Telescope
- LRS2: the new facility low resolution integral field spectrograph for the Hobby-Eberly Telescope
- Accounting for Multiplicity in Calculating Eta Earth
- Statistical properties of habitable zones in stellar binary systems