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A hot Mars-sized exoplanet transiting an M dwarf
- Source :
- AJ, 163, 3 (2022)
- Publication Year :
- 2021
-
Abstract
- We validate the planetary nature of an ultra-short period planet orbiting the M dwarf KOI-4777. We use a combination of space-based photometry from Kepler, high-precision, near-infrared Doppler spectroscopy from the Habitable-zone Planet Finder, and adaptive optics imaging to characterize this system. KOI-4777.01 is a Mars-sized exoplanet ($\mathrm{R}_{p}=0.51 \pm 0.03R_{\oplus}$) orbiting the host star every 0.412-days ($\sim9.9$-hours). This is the smallest validated ultra-short period planet known and we see no evidence for additional massive companions using our HPF RVs. We constrain the upper $3\sigma$ mass to $M_{p}<0.34~\mathrm{M_\oplus}$ by assuming the planet is less dense than iron. Obtaining a mass measurement for KOI-4777.01 is beyond current instrumental capabilities.<br />Comment: 25 pages, 8 figures, accepted for publication in AJ
- Subjects :
- Astrophysics - Earth and Planetary Astrophysics
Subjects
Details
- Database :
- arXiv
- Journal :
- AJ, 163, 3 (2022)
- Publication Type :
- Report
- Accession number :
- edsarx.2112.03958
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.3847/1538-3881/ac3088