GJ 1252 b: A 1.2 R⊕ Planet Transiting an M3 Dwarf at 20.4 pc

Shporer, Avi and Collins, Karen A. and Astudillo-Defru, Nicola and Irwin, Jonathan and Bonfils, Xavier and Collins, Kevin I. and Matthews, Elisabeth and Winters, Jennifer G. and Anderson, David R. and Armstrong, James D. and Charbonneau, David and Cloutier, Ryan and Daylan, Tansu and Gan, Tianjun and Gunther, Maximilian N. and Hellier, Coel and Horne, Keith and Huang, Chelsea X. ORCID: https://orcid.org/0000-0003-0918-7484 and Jensen, Eric L. N. and Kielkopf, John and Palle, Enric and Sefako, Ramotholo and Stassun, Keivan G. and Tan, Thiam-Guan and Vanderburg, Andrew and Ricker, George R. and Latham, David W. and Vanderspek, Roland and Seager, Sara and Winn, Joshua N. and Jenkins, Jon M. and Colon, Knicole and Dressing, Courtney D. and Leepine, Sebastien and Muirhead, Philip S. and Rose, Mark E. and Twicken, Joseph D. and Villasenor, Jesus Noel (2020) GJ 1252 b: A 1.2 R⊕ Planet Transiting an M3 Dwarf at 20.4 pc. The Astrophysical Journal Letters, 890 (1):L7. pp. 1-13. ISSN 2041-8205

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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.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Published version deposited in accordance with the copyright policy of the publisher.
Faculty/School / Institute/Centre: No Faculty
Faculty/School / Institute/Centre: No Faculty
Date Deposited: 31 Mar 2022 04:53
Last Modified: 17 May 2022 03:43
Uncontrolled Keywords: Exoplanet astronomy (486); M dwarf stars (982); Exoplanets (498); Astrophysics - Earth and Planetary Astrophysics
Fields of Research (2020): 51 PHYSICAL SCIENCES > 5101 Astronomical sciences > 510109 Stellar astronomy and planetary systems
Identification Number or DOI: https://doi.org/10.3847/2041-8213/ab7020
URI: http://eprints.usq.edu.au/id/eprint/47380

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