planetary systems; planets and satellites: individual: TOI-1442 b; planets and satellites: individual: TOI-2445 b; techniques: photometric; techniques: spectroscopic; methods: observational; Astrophysics - Earth; and Planetary Astrophysics
Abstract :
[en] Context. Exoplanets with orbital periods of less than one day are known as ultra-short period (USP) planets. They are relatively rare products of planetary formation and evolution processes, but especially favourable for characterisation with current planet detection methods. At the time of writing, 125 USP planets have already been confirmed. <BR /> Aims: Our aim is to validate the planetary nature of two new transiting planet candidates around M dwarfs announced by the NASA Transiting Exoplanet Survey Satellite (TESS), registered as TESS Objects of Interest (TOIs) TOI-1442.01 and TOI-2445.01. <BR /> Methods: We used TESS data, ground-based photometric light curves, and Subaru/IRD spectrograph radial velocity (RV) measurements to validate both planetary candidates and to establish their physical properties. <BR /> Results: TOI-1442 bis a validated exoplanet with an orbital period of P = 0.4090682 ± 0.0000004 day, a radius of R<SUB>p</SUB> = 1.15 ± 0.06 R<SUB>⊕</SUB>, and equilibrium temperature of T<SUB>p,eq</SUB> = 1357<SUB>−42</SUB><SUP>+49</SUP> K. TOI-2445 b is also validated with an orbital period of P = 0.3711286 ± 0.0000004 day, a radius of R<SUB>p</SUB> = 1.33 ± 0.09 R<SUB>⊕</SUB>, and equilibrium temperature of T<SUB>p,eq</SUB> = 1330<SUB>−56</SUB><SUP>+61</SUP> K. Their physical properties align with current empirical trends and formation theories of USP planets. Based on the RV measurements, we set 3σ upper mass limits of 8 M<SUB>⊕</SUB> and 20 M<SUB>⊕</SUB>, thus confirming the non-stellar, sub-Jovian nature of both transiting objects. More RV measurements will be needed to constrain the planetary masses and mean densities, and the predicted presence of outer planetary companions. These targets extend the small sample of USP planets orbiting around M dwarfs up to 21 members. They are also among the 20 most suitable terrestrial planets for atmospheric characterisation via secondary eclipse with the James Webb Space Telescope, according to a widespread emission spectroscopy metric.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Morello, G.; Astrophysical Institute of the Canaries, -, Astronomical Observatory of Palermo, Chalmers University, Department of Earth and Space Sciences
Parviainen, H.; Astrophysical Institute of the Canaries, -
Murgas, F.; Astrophysical Institute of the Canaries, -
Pallé, E.; Astrophysical Institute of the Canaries, -
Oshagh, M.; Astrophysical Institute of the Canaries, -
Fukui, A.; University of Tokyo, Japan, Astrophysical Institute of the Canaries
Hirano, T.; Center for Astrobiology, Madrid, National Astronomical Observatory of Japan
Ishikawa, H. T.; Center for Astrobiology, Madrid, National Astronomical Observatory of Japan
Mori, M.; University of Tokyo, Department of Astronomy
Narita, N.; University of Tokyo, Japan, Center for Astrobiology, Madrid, Astrophysical Institute of the Canaries
Collins, K. A.; Harvard Smithsonian Center for Astrophysics
Barkaoui, Khalid ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > Exoplanets in Transit: Identification and Characterization
Lewin, P.; The Maury Lewin Astronomical Observatory, Glendora, CA, 91741, USA
Cadieux, C.; University of Montreal, Department of Physics
de Leon, J. P.; University of Tokyo, Department of Astronomy
Soubkiou, A.; University Cadi Ayyad, Morocco, University of Porto, Center for Astrophysics, -
Abreu Garcia, N.; Astrophysical Institute of the Canaries, -
Crouzet, N.; European Space Research and Technology Centre
Esparza-Borges, E.; Astrophysical Institute of the Canaries, -
Fernández Rodríguez, G. E.; Astrophysical Institute of the Canaries
Galán, D.; Astrophysical Institute of the Canaries, -
Hori, Y.; Center for Astrobiology, Madrid, National Astronomical Observatory of Japan
Ikoma, M.; National Astronomical Observatory of Japan
Isogai, K.; Kyoto University, Japan, University of Tokyo, Japan
Kagetani, T.; University of Tokyo, Japan
Kawauchi, K.; Astrophysical Institute of the Canaries, -, University of Tokyo, Japan
Kimura, T.; University of Tokyo, Department of Earth and Planetary Environmental Science
Kodama, T.; University of Tokyo, Japan
Korth, J.; Chalmers University, Department of Earth and Space Sciences, -, Lund Observatory
Kotani, T.; Center for Astrobiology, Madrid, National Astronomical Observatory of Japan, Graduate University for Advanced Studies, Department of Astronomical Science
Krishnamurthy, V.; Center for Astrobiology, Madrid, National Astronomical Observatory of Japan
Kurita, S.; University of Tokyo, Department of Earth and Planetary Environmental Science
Laza-Ramos, A.; Astrophysical Institute of the Canaries
Livingston, J. H.; University of Tokyo, Department of Astronomy
Luque, R.; Institute of Astrophysics of Andalusia
Madrigal-Aguado, A.; Astrophysical Institute of the Canaries, -
Nishiumi, T.; Graduate University for Advanced Studies, Department of Astronomical Science, Center for Astrobiology, Madrid, University of Tokyo, Japan
Orell-Miquel, J.; Astrophysical Institute of the Canaries, -
Puig-Subirà, M.; Astrophysical Institute of the Canaries, -
Sánchez-Benavente, M.; Astrophysical Institute of the Canaries, -
Stangret, M.; Astronomical Observatory of Padua, Astrophysical Institute of the Canaries, -
Tamura, M.; University of Tokyo, Department of Astronomy, Center for Astrobiology, Madrid, National Astronomical Observatory of Japan
Terada, Y.; Institute of Astronomy and Astrophysics Academia Sinica, -
Watanabe, N.; University of Tokyo, Japan
Zou, Y.; University of Tokyo, Japan
Benkhaldoun, Z.; University Cadi Ayyad, Morocco
Collins, K. I.; George Mason University, Virginia
Doyon, R.; Observatoire du Mont-Mégantic, Université de Montréal, Montréal, QC, H3C 3J7, Canada
Garcia, Lionel ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > Exoplanets in Transit: Identification and Characterization
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