π Earth: A 3.14 day Earth-sized Planet from K2's Kitchen Served Warm by the SPECULOOS Team

Niraula, Prajwal; de Wit, Julien; Rackham, Benjamin V.; Ducrot, Elsa; Burdanov, Artem; Crossfield, Ian J. M.; Van Grootel, Valérie; Murray, Catriona; Garcia, Lionel; Alonso, Roi; Beard, Corey; Maqueo Chew, Yilen Gómez; Delrez, Laetitia; Demory, Brice-Olivier; Fulton, Benjamin J.; Gillon, Michaël; Günther, Maximilian N.; Howard, Andrew W.; Issacson, Howard; Jehin, Emmanuel; Pedersen, Peter P.; Pozuelos Romero, Francisco José; Queloz, Didier; Rebolo-López, Rafael; Lalitha, Sairam; Sebastian, Daniel; Thompson, Samantha; Triaud, Amaury H. M. J.

doi:10.3847/1538-3881/aba95f

Reference : π Earth: A 3.14 day Earth-sized Planet from K2's Kitchen Served Warm by the SPECULOOS Team


	Document type :	Scientific journals : Article
	Discipline(s) :	Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
	To cite this reference:	http://hdl.handle.net/2268/249338

Title :	π Earth: A 3.14 day Earth-sized Planet from K2's Kitchen Served Warm by the SPECULOOS Team
Language :	English
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 >]
	Murray, Catriona [Cavendish Laboratory, J J Thomson Avenue, Cambridge CB3 0HE, UK]
	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]
	Queloz, Didier [Cavendish Laboratory, J J Thomson Avenue, Cambridge CB3 0HE, UK]
	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 >]
	Thompson, Samantha [Cavendish Laboratory, J J Thomson Avenue, Cambridge CB3 0HE, UK]
	Triaud, Amaury H. M. J. [School of Physics & Astronomy, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK)]
Publication date :	1-Oct-2020
Journal title :	Astronomical Journal
Publisher :	American Astronomical Society
Volume :	160
Pages :	172
Peer reviewed :	Yes (verified by ORBi)
Audience :	International
ISSN :	0004-6256
e-ISSN :	1538-3881
Country :	United States
Keywords :	[en] Exoplanet detection methods ; Transit photometry ; 489 ; 1709 ; Astrophysics - Earth and Planetary Astrophysics
Abstract :	[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.
Funders :	EU - European Union
Target :	Professionals
Permalink :	http://hdl.handle.net/2268/249338
	also: http://hdl.handle.net/2268/252004
DOI :	10.3847/1538-3881/aba95f
Other URL :	https://ui.adsabs.harvard.edu/abs/2020AJ....160..172N
Framework Programme / European Project :	FP7 ; 336480 - SPECULOOS - SPECULOOS: searching for habitable planets amenable for biosignatures detection around the nearest ultra-cool stars

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