planets and satellites: detection; planets and satellites:; fundamental parameters; planets and satellites: terrestrial planets; stars: low-mass
Abstract :
[en] The Hidden Gems project searches the TESS data for additional planets transiting low-mass stars in confirmed systems. Our goal is to identify planet candidates that are below the detection threshold set by the SPOC and QLP pipelines using SHERLOCK, a specialized pipeline for robust detection and vetting of transit signals in TESS data. We present the discovery of two inner rocky planets in the TOI-237 and TOI-4336 A systems, validated with ground-based photometry from the TRAPPIST, SPECULOOS, ExTrA, and LCO facilities. TOI-237 c has a radius of , orbits its mid-M host star every 1.74 d, and is close to a 3:1 mean-motion resonance with TOI-237 b. TOI-4336 A c has a radius of , and orbits with a period of 7.58 d an M3.5 host star which is part of a hierarchical triple system. We performed model comparison to search for non-zero eccentricities, and found that the circular transit models are statistically favoured. Dynamical simulations show that both systems are in stable configurations, and the transit timing variations expected for the TOI-237 system are of the order of seconds. TOI-237 c and TOI-4336 A c join the high-interest population of warm likely super-Earths below the so-called radius valley. In particular, TOI-237 c is a good candidate for phase curve observations with JWST/MIRI thanks to the small radius of the host star and its short period.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Timmermans, Mathilde ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > Exoplanets in Transit: Identification and Characterization
Dévora-Pajares, M.; University of Granada, Department of Physics, -
Pozuelos, F. J.; Institute of Astrophysics of Andalusia
Barkaoui, Khalid ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > Exoplanets in Transit: Identification and Characterization
Rojas-Ayala, B.; University of Tarapaca, Chile
Almenara, J. M.; University of Geneva, Astronomical Observatory, Institute de Planetologie et d'Astrophysique de Grenoble
Howell, S. B.; NASA Ames Research Center
Triaud, A. H. M. J.; University of Birmingham, School of Physics and Astronomy
Gillon, Michaël ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO)
Scott, M. G.; University of Birmingham, School of Physics and Astronomy
Davis, Y. T.; University of Birmingham, School of Physics and Astronomy
Rackham, B. V.; MIT, Department of Earth and Planetary Science
Burgasser, A. J.; Department of Astronomy &, Astrophysics, UC San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA,
Bonfils, X.; Institute de Planetologie et d'Astrophysique de Grenoble
Collins, K. A.; Center for Astrophysics, Harvard &, Smithsonian, Observatory Building E, 60 Garden St, Cambridge, MA 02138, USA
Demory, B.-O.; University of Bern, Switzerland, University of Bern, Physics Institute
Dransfield, G.; University of Oxford, Department of Astrophysics, University of Oxford Magdalen College
Ducrot, E.; Observatoire de Paris, Laboratoire d'Etudes Spatiales et d'Instrumentation en Astrophysique, CEA Saclay, Service d'Astrophysique
Fukui, A.; University of Tokyo, Japan, Astrophysical Institute of the Canaries
Ghachoui, Mourad ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > COMets METeors and Asteroids (COMETA)
Chew, Y. Gómez Maqueo; UNAM, Institute of Astronomy
Jehin, Emmanuel ; Université de Liège - ULiège > Unités de recherche interfacultaires > Space sciences, Technologies and Astrophysics Research (STAR)
Narita, N.; University of Tokyo, Japan, Astrobiology Center, Japan, Astrophysical Institute of the Canaries
Pedersen, P. P.; University of Cambridge, Department of Physics, -
Schwarz, R. P.; Center for Astrophysics, Harvard &, Smithsonian, Observatory Building E, 60 Garden St, Cambridge, MA 02138, USA
Yalçinkaya, Selçuk ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > Exoplanets in Transit: Identification and Characterization
Way, Z.; Georgia State University, Department of Physics and Astronomy
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