Journal
ASTRONOMICAL JOURNAL
Volume 163, Issue 1, Pages -Publisher
IOP Publishing Ltd
DOI: 10.3847/1538-3881/ac3088
Keywords
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Funding
- NASA Headquarters under the NASA Earth and Space Science Fellowship Program [80NSSC18K1114]
- Alfred P. Sloan Foundation's Minority Ph.D. Program [G-201620166039]
- Pennsylvania State University
- Eberly College of Science
- NSF [AST 1006676, AST 1126413, AST 1310875, AST 1310885, AST 2009889, AST 2108512, MRI-1626251, AST1614690]
- NASA Astrobiology Institute [NNA09DA76A]
- Heising-Simons Foundation [20170494]
- Texas Advanced Computing Center
- NASA [80NSSC17K0122]
- NASA Office of Space Science [NNX09AF08G]
- NASA Science Mission directorate
- STSci under U.S. Government grant [NAG W-2166]
- National Geographic Society
- National Aeronautics and Space Administration [NNX08AR22G]
- National Science Foundation [AST1238877]
- Max Planck Institute for Astronomy, Heidelberg
- Max Planck Institute for Extraterrestrial Physics, Garching
- Johns Hopkins University
- Durham University
- University of Edinburgh
- Queen's University Belfast
- Harvard-Smithsonian Center for Astrophysics
- Las Cumbres Observatory Global Telescope Network Incorporated
- National Central University of Taiwan
- Space Telescope Science Institute
- University of Maryland
- Eotvos Lorand University (ELTE)
- Los Alamos National Laboratory
- Gordon and Betty Moore Foundation
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This study validates the planetary nature of an ultra-short-period planet orbiting the M dwarf KOI-4777. The planet, KOI-4777.01, is the smallest validated ultra-short period planet known and no evidence of additional massive companions has been found.
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 (R ( p ) = 0.51 +/- 0.03R (circle plus)) orbiting the host star every 0.412 days (similar to 9.9 hr). 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 M (circle plus) by assuming the planet is less dense than iron. Obtaining a mass measurement for KOI-4777.01 is beyond current instrumental capabilities.
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