GJ 1252 b: a 1.2 R⊕ planet transiting an M3 dwarf at 20.4 pc
Name
Shporer_2020_ApJL_890_L7.pdf
Description
Published version
Size
1.15 MB
Format
Adobe PDF
Checksum (MD5)
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Author(s)
Shporer, Abraham-Avi
Matthews, Elisabeth C
Daylan, Tansu
Günther, Maximilian N.
Huang, Chelsea X.
Ricker, George R
Vanderspek, Roland K
Seager, Sara
Villasenor, Jesus Noel Samonte
Alternative Title
GJ 1252 b: a 1.2 R[subscript ⊕] planet transiting an M3 dwarf at 20.4 pc
Date Issued
February 2020
Journal
Astrophysical Journal Letters
Publisher
American Astronomical Society
Citation
Shporer, Avi, et al., "GJ 1252 b: a 1.2 R⊕ planet transiting an M3 dwarf at 20.4 pc." Astrophysical Journal Letters 890, 1 (Feb. 2020): letter 7 doi 10.3847/2041-8213/ab7020 ©2020 Author(s)
Version
Final published version
Abstract
We report the discovery of GJ 1252 b, a planet with a radius of 1.193 ± 0.074 R and an orbital period of 0.52 days around an M3-type star (0.381 ± 0.019 M, 0.391 ± 0.020 R) located 20.385 ± 0.019 pc away. We use Transiting Exoplanet Survey Satellite (TESS) data, ground-based photometry and spectroscopy, Gaia astrometry, and high angular resolution imaging to show that the transit signal seen in the TESS data must originate from a transiting planet. We do so by ruling out all false-positive scenarios that attempt to explain the transit signal as originating from an eclipsing stellar binary. Precise Doppler monitoring also leads to a tentative mass measurement of 2.09 ± 0.56 M ⊕. The host star proximity, brightness (V = 12.19 mag, K = 7.92 mag), low stellar activity, and the system's short orbital period make this planet an attractive target for detailed characterization, including precise mass measurement, looking for other objects in the system, and planet atmosphere characterization.
MIT Department
Massachusetts Institute of Technology. Department of Physics
MIT Kavli Institute for Astrophysics and Space Research
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DOI of Published Version
https://doi.org/10.3847/2041-8213/ab7020
