[en] We report on the discovery of a transiting Earth-sized (0.95R[SUB]⊕[/SUB]) planet around an M3.5 dwarf star at 57 pc, EPIC 249631677. The planet has a period of ∼3.14 days, i.e., ∼π, with an installation of 7.45 S[SUB]⊕[/SUB]. The detection was made using publicly available data from K2's Campaign 15. We observed three additional transits with SPECULOOS Southern and Northern Observatories, and a stellar spectrum from Keck/HIRES, which allowed us to validate the planetary nature of the signal. The confirmed planet is well suited for comparative terrestrial exoplanetology. While exoplanets transiting ultracool dwarfs present the best opportunity for atmospheric studies of terrestrial exoplanets with the James Webb Space Telescope, those orbiting mid-M dwarfs within 100 pc such as EPIC 249631677b will become increasingly accessible with the next generation of observatories.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Niraula, Prajwal; Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA
de Wit, Julien; Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA
Rackham, Benjamin V.; 51 Pegasi b Fellow. ; Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA
Ducrot, Elsa ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Exotic
Burdanov, Artem; Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA
Crossfield, Ian J. M.; Kansas University, Department of Physics and Astronomy, 1082 Malott, 1251 Wescoe Hall Drive, Lawrence, KS 66045, USA
Van Grootel, Valérie ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie
Garcia, Lionel ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Exotic
Alonso, Roi; Instituto de Astrofísica de Canarias, E-38205 La Laguna, Tenerife, Spain ; Dpto. de Astrofísica, Universidad de La Laguna, E-38206 La Laguna, Tenerife, Spain
Beard, Corey; Department of Physics & Astronomy, University of California, Irvine, 4129 Frederick Reines Hall, Irvine, CA 92697, USA
Maqueo Chew, Yilen Gómez; Instituto de Astronomía, Universidad Nacional Autónoma de México, Ciudad Universitaria, CDMX, C.P. 04510, Mexico
Delrez, Laetitia ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Exotic
Demory, Brice-Olivier; University of Bern, Center for Space and Habitability, Gesellschaftsstrasse 6, CH-3012 Bern, Switzerland
Fulton, Benjamin J.; NASA Exoplanet Science Institute/Caltech-IPAC, Pasadena, CA, USA
Gillon, Michaël ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Exotic
Günther, Maximilian N.; Juan Carlos Torres Fellow. ; Department of Physics, and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
Howard, Andrew W.; California Institute of Technology, Pasadena, CA, USA
Issacson, Howard; Department of Astronomy, University of California, Berkeley, Berkeley, CA 94720, USA
Jehin, Emmanuel ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa)
Pedersen, Peter P.; Cavendish Laboratory, J J Thomson Avenue, Cambridge CB3 0HE, UK
Pozuelos Romero, Francisco José ; Astrobiology Research Unit, University of Liège, Allée du 6 Août, 19, B-4000 Liège (Sart-Tilman), Belgium ; Space Sciences, Technologies and Astrophysics Research (STAR) Institute, University of Liège, Allée du 6 Août 19C, B-4000 Liége, Belgium
Rebolo-López, Rafael; Instituto de Astrofísica de Canarias, E-38205 La Laguna, Tenerife, Spain ; Dpto. de Astrofísica, Universidad de La Laguna, E-38206 La Laguna, Tenerife, Spain
Lalitha, Sairam; School of Physics & Astronomy, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK
Sebastian, Daniel ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Exotic
