A super-Earth and a sub-Neptune orbiting the bright, quiet M3 dwarf TOI-1266
English
Demory, B.-O.[Center for Space and Habitability, University of Bern, Gesellschaftsstrasse 6, 3012, Bern, Switzerland]
Pozuelos Romero, Francisco José[Space Sciences, Technologies and Astrophysics Research (STAR) Institute, Université de Liège, Allée du 6 Août 19C, 4000, Liège, Belgium; Astrobiology Research Unit, Université de Liège, Allée du 6 Août 19C, 4000, Liège, Belgium]
Gómez Maqueo Chew, Y.[Instituto de Astronomía, Universidad Nacional Autónoma de México, Ciudad Universitaria, Ciudad de México, 04510, México]
Sabin, L.[Instituto de Astronomía, Universidad Nacional Autónoma de México, Apdo. Postal 877, 22800, Ensenada, B.C., México]
Petrucci, R.[Instituto de Astronomía, Universidad Nacional Autónoma de México, Ciudad Universitaria, Ciudad de México, 04510, México; Universidad Nacional de Córdoba - Observatorio Astronómico de Córdoba, Laprida 854, X5000BGR, Córdoba, Argentina; Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina]
Schroffenegger, U.[Center for Space and Habitability, University of Bern, Gesellschaftsstrasse 6, 3012, Bern, Switzerland]
Grimm, S. L.[Center for Space and Habitability, University of Bern, Gesellschaftsstrasse 6, 3012, Bern, Switzerland]
Sestovic, M.[Center for Space and Habitability, University of Bern, Gesellschaftsstrasse 6, 3012, Bern, Switzerland]
Gillon, Michaël[Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Exotic >]
McCormac, J.[Department of Physics, University of Warwick, Gibbet Hill Road, Coventry, CV4 7AL, UK; Centre for Exoplanets and Habitability, University of Warwick, Gibbet Hill Road, Coventry, CV4 7AL, UK]
Barkaoui, Khalid[Université de Liège - ULiège > > Astrobiology >]
Benz, W.[Center for Space and Habitability, University of Bern, Gesellschaftsstrasse 6, 3012, Bern, Switzerland]
Bouchy, F.[Observatoire astronomique de l'Université de Genève, 51 chemin des Maillettes, 1290, Versoix, Switzerland]
Burdanov, A.[Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA; Instituto de Astrofísica de Canarias, Vía Láctea s/n, 38205, La Laguna, Tenerife, Spain]
Collins, K. A.[Center for Astrophysics | Harvard & Smithsonian, 60 Garden Street, Cambridge, MA, 02138, USA]
de Wit, J.[Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA]
Dressing, C. D.[Department of Astronomy, 501 Campbell Hall, University of California at Berkeley, Berkeley, CA, 94720, USA]
Garcia, Lionel[Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Exotic >]
Giacalone, S.[Department of Astronomy, 501 Campbell Hall, University of California at Berkeley, Berkeley, CA, 94720, USA]
Haldemann, J.[Center for Space and Habitability, University of Bern, Gesellschaftsstrasse 6, 3012, Bern, Switzerland]
Heng, K.[Center for Space and Habitability, University of Bern, Gesellschaftsstrasse 6, 3012, Bern, Switzerland; Department of Physics, University of Warwick, Gibbet Hill Road, Coventry, CV4 7AL, UK]
Jehin, Emmanuel[Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa) >]
Jofré, E.[Instituto de Astronomía, Universidad Nacional Autónoma de México, Ciudad Universitaria, Ciudad de México, 04510, México; Universidad Nacional de Córdoba - Observatorio Astronómico de Córdoba, Laprida 854, X5000BGR, Córdoba, Argentina; Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina]
Kane, S. R.[Department of Earth and Planetary Sciences, University of California, Riverside, CA, 92521, USA]
Lillo-Box, J.[Centro de Astrobiología (CAB, CSIC-INTA), Dpto. de Astrofísica, ESAC campus 28692 Villanueva de la Cañada, (Madrid), Spain]
Maigné, V.[Center for Space and Habitability, University of Bern, Gesellschaftsstrasse 6, 3012, Bern, Switzerland]
Mordasini, C.[Physikalisches Institut, University of Bern, Gesellschaftsstrasse 6, 3012, Bern, Switzerland]
Morris, B. M.[Center for Space and Habitability, University of Bern, Gesellschaftsstrasse 6, 3012, Bern, Switzerland]
Niraula, P.[Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA]
Rackham, B. V.[Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA; Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA, 02139, USA]
Savel, A. B.[Department of Astronomy, 501 Campbell Hall, University of California at Berkeley, Berkeley, CA, 94720, USA; Department of Physics, University of California, Berkeley, CA, Berkeley]
Soubkiou, A.[Oukaimeden Observatory, High Energy Physics and Astrophysics Laboratory, Cadi Ayyad University, Marrakech, Morocco]
Stassun, K. G.[Department of Physics & Astronomy, Vanderbilt University, 6301 Stevenson Center Lane, Nashville, TN, 37235, USA]
Triaud, A. H. M. J.[School of Physics & Astronomy, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK]
Zambelli, R.[Società Astronomica Lunae, Castelnuovo Magra, Via Montefrancio 77, Italy]
Ricker, G.[Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA, 02139, USA]
Latham, D. W.[Center for Astrophysics | Harvard & Smithsonian, 60 Garden Street, Cambridge, MA, 02138, USA]
Seager, S.[Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA; Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA, 02139, USA; Department of Aeronautics and Astronautics, MIT, 77 Massachusetts Avenue, Cambridge, MA, 02139, USA]
Winn, J. N.[Department of Astrophysical Sciences, Princeton University, NJ, 08544, USA]
Jenkins, J. M.[NASA Ames Research Center, Moffett Field, CA, 94035, USA]
Calvario-Velásquez, T.[Instituto de Astronomía, Universidad Nacional Autónoma de México, Apdo. Postal 877, 22800, Ensenada, B.C., México]
Franco Herrera, J. A.[Instituto de Astronomía, Universidad Nacional Autónoma de México, Apdo. Postal 877, 22800, Ensenada, B.C., México]
Colorado, E.[Instituto de Astronomía, Universidad Nacional Autónoma de México, Apdo. Postal 877, 22800, Ensenada, B.C., México]
Cadena Zepeda, E. O.[Instituto de Astronomía, Universidad Nacional Autónoma de México, Apdo. Postal 877, 22800, Ensenada, B.C., México]
Figueroa, L.[Instituto de Astronomía, Universidad Nacional Autónoma de México, Apdo. Postal 877, 22800, Ensenada, B.C., México]
Watson, A. M.[Instituto de Astronomía, Universidad Nacional Autónoma de México, Ciudad Universitaria, Ciudad de México, 04510, México]
Lugo-Ibarra, E. E.[Instituto de Astronomía, Universidad Nacional Autónoma de México, Apdo. Postal 877, 22800, Ensenada, B.C., México]
Carigi, L.[Instituto de Astronomía, Universidad Nacional Autónoma de México, Ciudad Universitaria, Ciudad de México, 04510, México]
Guisa, G.[Instituto de Astronomía, Universidad Nacional Autónoma de México, Apdo. Postal 877, 22800, Ensenada, B.C., México]
Herrera, J.[Instituto de Astronomía, Universidad Nacional Autónoma de México, Apdo. Postal 877, 22800, Ensenada, B.C., México]
Sierra Díaz, G.[Instituto de Astronomía, Universidad Nacional Autónoma de México, Apdo. Postal 877, 22800, Ensenada, B.C., México]
Suárez, J. C.[Departamento de Física Teórica y del Cosmos, Universidad de Granada, Campus de Fuentenueva s/n, 18071, Granada, Spain; Instituto de Astrofísica de Andalucía (CSIC), Glorieta de la Astronomía s/n, 18008, Granada, Spain]
Barrado, D.[Centro de Astrobiología (CAB, CSIC-INTA), Dpto. de Astrofísica, ESAC campus 28692 Villanueva de la Cañada, (Madrid), Spain]
Batalha, N. M.[Department of A&A, University of California, Santa Cruz, CA, 95064, USA]
Benkhaldoun, Z.[Oukaimeden Observatory, High Energy Physics and Astrophysics Laboratory, Cadi Ayyad University, Marrakech, Morocco]
Chontos, A.[Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI, 96822, USA]
Dai, F.[Division of Geological and Planetary Sciences, California Institute of Technology, 1200 East California Blvd, Pasadena, CA, 91125, USA]
Essack, Z.[Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA; Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA, 02139, USA]
Ghachoui, M.[Oukaimeden Observatory, High Energy Physics and Astrophysics Laboratory, Cadi Ayyad University, Marrakech, Morocco]
Huang, C. X.[Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA, 02139, USA]
Huber, D.[Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI, 96822, USA]
Isaacson, H.[Department of Astronomy, 501 Campbell Hall, University of California at Berkeley, Berkeley, CA, 94720, USA; Centre for Astrophysics, University of Southern Queensland, Toowoomba, QLD, Australia]
Lissauer, J. J.[NASA Ames Research Center, Moffett Field, CA, 94035, USA]
Morales-Calderón, M.[Centro de Astrobiología (CAB, CSIC-INTA), Dpto. de Astrofísica, ESAC campus 28692 Villanueva de la Cañada, (Madrid), Spain]
Robertson, P.[Department of Physics & Astronomy, University of California Irvine, Irvine, CA, 92697, USA]
Roy, A.[Division of Geological and Planetary Sciences, California Institute of Technology, 1200 East California Blvd, Pasadena, CA, 91125, USA]
Twicken, J. D.[NASA Ames Research Center, Moffett Field, CA, 94035, USA; SETI Institute, Mountain View, CA 94043, USA]
Vanderburg, A.[Department of Astronomy, The University of Texas at Austin, Austin, TX, 78712, USA]
Weiss, L. M.[Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI, 96822, USA)]
[en] instrumentation: detectors ; planets and satellites: detection ; Astrophysics - Earth and Planetary Astrophysics
[en] We report the discovery and characterisation of a super-Earth and a sub-Neptune transiting the bright (K = 8.8), quiet, and nearby (37 pc) M3V dwarf TOI-1266. We validate the planetary nature of TOI-1266 b and c using four sectors of TESS photometry and data from the newly-commissioned 1-m SAINT-EX telescope located in San Pedro Mártir (México). We also include additional ground-based follow-up photometry as well as high-resolution spectroscopy and high-angular imaging observations. The inner, larger planet has a radius of R = 2.37[SUB]-0.12[/SUB][SUP]+0.16[/SUP] R[SUB]⊕[/SUB] and an orbital period of 10.9 days. The outer, smaller planet has a radius of R = 1.56[SUB]-0.13[/SUB][SUP]+0.15[/SUP] R[SUB]⊕[/SUB] on an 18.8-day orbit. The data are found to be consistent with circular, co-planar and stable orbits that are weakly influenced by the 2:1 mean motion resonance. Our TTV analysis of the combined dataset enables model-independent constraints on the masses and eccentricities of the planets. We find planetary masses of M[SUB]p[/SUB] = 13.5[SUB]-9.0[/SUB][SUP]+11.0[/SUP] M[SUB]⊕[/SUB] (<36.8 M[SUB]⊕[/SUB] at 2-σ) for TOI-1266 b and 2.2[SUB]-1.5[/SUB][SUP]+2.0[/SUP] M[SUB]⊕[/SUB] (<5.7 M[SUB]⊕[/SUB] at 2-σ) for TOI-1266 c. We find small but non-zero orbital eccentricities of 0.09[SUB]-0.05[/SUB][SUP]+0.06[/SUP] (<0.21 at 2-σ) for TOI-1266 b and 0.04 ± 0.03 (< 0.10 at 2-σ) for TOI-1266 c. The equilibrium temperatures of both planets are of 413 ± 20 and 344 ± 16 K, respectively, assuming a null Bond albedo and uniform heat redistribution from the day-side to the night-side hemisphere. The host brightness and negligible activity combined with the planetary system architecture and favourable planet-to-star radii ratios makes TOI-1266 an exquisite system for a detailed characterisation.
[Space Sciences, Technologies and Astrophysics Research (STAR) Institute, Université de Liège, Allée du 6 Août 19C, 4000, Liège, Belgium; Astrobiology Research Unit, Université de Liège, Allée du 6 Août 19C, 4000, Liège, Belgium]
