instrumentation: detectors; planets and satellites: detection; Astrophysics - Earth and Planetary Astrophysics
Abstract :
[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.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
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
Benz, W.; Center for Space and Habitability, University of Bern, Gesellschaftsstrasse 6, 3012, Bern, Switzerland
Bieryla, A.; Center for Astrophysics | Harvard & Smithsonian, 60 Garden Street, Cambridge, MA, 02138, USA
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
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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
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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
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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
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