[en] We present the discovery and validation of two TESS exoplanets orbiting nearby M dwarfs: TOI-2084 b, and TOI-4184b. We characterized the host stars by combining spectra from Shane/Kast and Magellan/FIRE, spectral energy distribution analysis, and stellar evolutionary models. In addition, we used Gemini-South/Zorro & -North/Alopeke high-resolution imaging, archival science images, and statistical validation packages to support the planetary interpretation. We performed a global analysis of multi-colour photometric data from TESS and ground-based facilities in order to derive the stellar and planetary physical parameters for each system. We find that TOI-2084 band TOI-4184 bare sub-Neptune-sized planets with radii of R<SUB>p</SUB> = 2.47 ± 0.13R<SUB>⊕</SUB> and R<SUB>p</SUB> = 2.43 ± 0.21 R<SUB>⊕</SUB>, respectively. TOI-2084 b completes an orbit around its host star every 6.08 days, has an equilibrium temperature of T<SUB>eq</SUB> = 527 ± 8 K and an irradiation of S<SUB>p</SUB> = 12.8 ± 0.8 S<SUB>⊕</SUB>. Its host star is a dwarf of spectral M2.0 ± 0.5 at a distance of 114 pc with an effective temperature of T<SUB>eff</SUB> = 3550 ± 50 K, and has a wide, co-moving M8 companion at a projected separation of 1400 au. TOI-4184 b orbits around an M5.0 ± 0.5 type dwarf star (K<SUB>mag</SUB> = 11.87) each 4.9 days, and has an equilibrium temperature of T<SUB>eq</SUB> = 412 ± 8 K and an irradiation of S<SUB>p</SUB> = 4.8 ± 0.4 S<SUB>⊕</SUB>. TOI-4184 is a metal poor star ([Fe/H] = −0.27 ± 0.09 dex) at a distance of 69 pc with an effective temperature of T<SUB>eff</SUB> = 3225 ± 75 K. Both planets are located at the edge of the sub-Jovian desert in the radius-period plane. The combination of the small size and the large infrared brightness of their host stars make these new planets promising targets for future atmospheric exploration with JWST.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Barkaoui, Khalid ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > Exoplanets in Transit: Identification and Characterization
Soubkiou, A.; University Cadi Ayyad, Morocco, University of Porto, Center for Astrophysics, -
Rackham, B. V.; MIT, Department of Earth and Planetary Science, MIT, Center for Space Research/Kavli Institute
Burgasser, A. J.; University of California, San Diego, Center for Astrophysics and Space Science
Chouqar, J.; University Cadi Ayyad, Morocco
Pozuelos, F. J.; Institute of Astrophysics of Andalusia
Collins, K. A.; Harvard Smithsonian Center for Astrophysics
Howell, S. B.; NASA Ames Research Center
Simcoe, R.; University of California, San Diego, Center for Astrophysics and Space Science
Melis, C.; University of California, San Diego, Center for Astrophysics and Space Science
Stassun, K. G.; Vanderbilt University, Department of Physics and Astronomy
Tregloan-Reed, J.; University of Atacama, Chile
Cointepas, M.; Institute de Planetologie et d'Astrophysique de Grenoble, University of Geneva, Astronomical Observatory
Gillon, Michaël ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO)
Bonfils, X.; Institute de Planetologie et d'Astrophysique de Grenoble
Furlan, E.; Infrared Processing and Analysis Center
Gnilka, C. L.; NASA Ames Research Center
Almenara, J. M.; Institute de Planetologie et d'Astrophysique de Grenoble
Alonso, R.; Instituto de Astrofisica de Canarias (IAC), Calle Vía Láctea s/n, 38200, La Laguna, Tenerife, Spain, Departamento de Astrofisica, Universidad de La Laguna (ULL), 38206, La Laguna, Tenerife, Spain
Benkhaldoun, Z.; University Cadi Ayyad, Morocco
Bonavita, M.; Royal Observatory Edinburgh
Bouchy, F.; University of Geneva, Astronomical Observatory
Burdanov, A.; MIT, Department of Earth and Planetary Science
Chinchilla, P.; Instituto de Astrofisica de Canarias (IAC), Calle Vía Láctea s/n, 38200, La Laguna, Tenerife, Spain
Delrez, Laetitia ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > Exoplanets in Transit: Identification and Characterization
Demangeon, O.; University of Porto, Center for Astrophysics, -
Dominik, M.; Scottish Universities Physics Alliance
Demory, B. -O.; University of Bern, Switzerland
de Wit, J.; MIT, Department of Earth and Planetary Science
Dransfield, G.; University of Birmingham, School of Physics and Astronomy
Ducrot, E.; CEA Saclay, Service d'Astrophysique
Fukui, A.; University of Tokyo, Japan, -
Hinse, T. C.; University of Southern Denmark, University Library, Campusvej 55, 5230, Odense M, Denmark
Hooton, M. J.; University of Cambridge, Institute of Astronomy
Jehin, Emmanuel ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa)
Jenkins, J. M.; NASA Ames Research Center
Jørgensen, U. G.; Centre for ExoLife Sciences, Niels Bohr Institute, University of Copenhagen, Øster Voldgade 5, 1350, Copenhagen, Denmark
Latham, D. W.; Harvard Smithsonian Center for Astrophysics
Garcia, Lionel ; Université de Liège - ULiège > Astrobiology
Carrazco-Gaxiola, S.; Universidad Nacional Autonoma de México, Instituto de Astronomia, AP 70-264, Ciudad de México, 04510, Mexico, Department of Physics and Astronomy, Georgia State University, Atlanta, GA, 30302-4106, USA, RECONS Institute, Chambersburg, PA, 17201, USA
Gómez Maqueo Chew, Y.; Universidad Nacional Autonoma de México, Instituto de Astronomia, AP 70-264, Ciudad de México, 04510, Mexico
Günther, M. N.; European Space Research and Technology Centre
McCormac, J.; University of Warwick, Department of Physics
Murgas, F.; Instituto de Astrofisica de Canarias (IAC), Calle Vía Láctea s/n, 38200, La Laguna, Tenerife, Spain, Departamento de Astrofisica, Universidad de La Laguna (ULL), 38206, La Laguna, Tenerife, Spain
Murray, C. A.; University of Colorado, Boulder, Department of Astrophysical and Planetary Sciences
Narita, N.; University of Tokyo, Japan, Center for Astrobiology, Madrid, -
Niraula, P.; MIT, Department of Earth and Planetary Science
Pedersen, P. P.; University of Cambridge, Institute of Astronomy
Queloz, D.; University of Cambridge, Institute of Astronomy
Rebolo-López, R.; Instituto de Astrofisica de Canarias (IAC), Calle Vía Láctea s/n, 38200, La Laguna, Tenerife, Spain, Departamento de Astrofisica, Universidad de La Laguna (ULL), 38206, La Laguna, Tenerife, Spain
Ricker, G.; MIT, Center for Space Research/Kavli Institute
Sabin, L.; Universidad Nacional Autonoma de México, Instituto de Astronomia, AP 106, Ensenada, 22800, BC, Mexico
Sajadian, S.; Isfahan University of Technology, Iran
Schanche, N.; University of Bern, Switzerland
Schwarz, R. P.; Harvard Smithsonian Center for Astrophysics
Seager, S.; University of California, San Diego, Center for Astrophysics and Space Science, University of La Laguna, Spain, University of Maryland, Department of Astronomy
Sebastian, D.; University of Birmingham, School of Physics and Astronomy
Sefako, R.; South African Astronomical Observatory
Sohy, Sandrine ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa)
Southworth, J.; Keele University, Department of Physics and Astrophysics
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