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

Shporer, Avi; Collins, Karen A.; Astudillo-Defru, Nicola; Irwin, Jonathan; Bonfils, Xavier; Collins, Kevin I.; Matthews, Elisabeth; Winters, Jennifer G.; Anderson, David R.; Armstrong, James D.; Charbonneau, David; Cloutier, Ryan; Daylan, Tansu; Gan, Tianjun; Günther, Maximilian N.; Hellier, Coel; Horne, Keith; Huang, Chelsea X.; Jensen, Eric L. N.; Kielkopf, John; Palle, Enric; Sefako, Ramotholo; Stassun, Keivan G.; Tan, Thiam-Guan; Vanderburg, Andrew; Ricker, George R.; Latham, David W.; Vanderspek, Roland; Seager, Sara; Winn, Joshua N.; Jenkins, Jon M.; Colon, Knicole; Dressing, Courtney D.; Léepine, Sébastien; Muirhead, Philip S.; Rose, Mark E.; Twicken, Joseph D.; Villasenor, Jesus Noel
Bibliographical reference

The Astrophysical Journal

Advertised on:
2
2020
Number of authors
38
IAC number of authors
1
Citations
34
Refereed citations
33
Description
We report the discovery of GJ 1252 b, a planet with a radius of 1.193 ± 0.074 ${R}_{\oplus }$ and an orbital period of 0.52 days around an M3-type star (0.381 ± 0.019 ${M}_{\odot }$ , 0.391 ± 0.020 ${R}_{\odot }$ ) 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.
Related projects
Projects' name image
Exoplanets and Astrobiology
The search for life in the universe has been driven by recent discoveries of planets around other stars (known as exoplanets), becoming one of the most active fields in modern astrophysics. The growing number of new exoplanets discovered in recent years and the recent advance on the study of their atmospheres are not only providing new valuable
Enric
Pallé Bago