Reference : TOI-2257 b: A highly eccentric long-period sub-Neptune transiting a nearby M dwarf
E-prints/Working papers : Already available on another site
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/264930
TOI-2257 b: A highly eccentric long-period sub-Neptune transiting a nearby M dwarf
English
Schanche, N. mailto [> >]
Pozuelos, F. J. [> >]
Günther, M. N. [> >]
Wells, R. D. [> >]
Burgasser, A. J. [> >]
Chinchilla, P. [> >]
Delrez, Laetitia mailto [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Exotic >]
Ducrot, Elsa [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Exotic >]
Garcia, Lionel mailto [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Exotic >]
Gómez Maqueo Chew, Y. [> >]
Jofré, E. [> >]
Rackham, B. V. [> >]
Sebastian, Daniel mailto [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Exotic >]
Stassun, K. G. [> >]
Stern, David [Université de Liège - ULiège > > GIGA Platform Genomics >]
Timmermans, Mathilde mailto [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Exotic >]
Barkaoui, Khalid mailto [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Exotic >]
Belinski, A. [> >]
Benkhaldoun, Z. [> >]
Benz, W. [> >]
Charbonneau, D. [> >]
Christiansen, Jessie L. [> >]
Collins, Karen A. [> >]
Demory, B.-O. [> >]
Dévora-Pajares, M. [> >]
de Wit, J. [> >]
Dragomir, D. [> >]
Dransfield, G. [> >]
Furlan, E. [> >]
Ghachou, M. [> >]
Gillon, Michaël mailto [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Exotic >]
Gnilka, C. [> >]
Gómez-Muñoz, M. A. [> >]
Guerrero, N. [> >]
Harris, M. [> >]
Heng, K. [> >]
Henze, C. E. [> >]
Hesse, K. [> >]
Howell, S. B. [> >]
Jehin, Emmanuel mailto [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa) >]
Jenkins, J. [> >]
Jensen, Eric L. N. [> >]
Kunimoto, M. [> >]
Latham, D. W. [> >]
Lester, K. [> >]
McLeod, Kim K. [> >]
Mireles, I. [> >]
Murray, C. A. [> >]
Niraula, P. [> >]
Pedersen, P. P. [> >]
Queloz, D. [> >]
Quintana, E. V. [> >]
Ricker, G. [> >]
Rudat, A. [> >]
Sabin, L. [> >]
Safonov, B. [> >]
Schroffenegger, U. [> >]
Scott, N. [> >]
Seager, S. [> >]
Strakhov, I. [> >]
Triaud, A. H. M. J. [> >]
Vanderspek, R. [> >]
Vezie, M. [> >]
Winn, J. [> >]
1-Nov-2021
No
[en] Astrophysics - Earth and Planetary Astrophysics
[en] Thanks to the relative ease of finding and characterizing small planets around M dwarf stars, these objects have become cornerstones in the field of exoplanet studies. The current paucity of planets in long-period orbits around M dwarfs make such objects particularly compelling as they provide clues about the formation and evolution of these systems. In this study, we present the discovery of TOI-2257 b (TIC 198485881), a long-period (35 d) sub-Neptune orbiting an M3 star at 57.8pc. Its transit depth is about 0.4%, large enough to be detected with medium-size, ground-based telescopes. The long transit duration suggests the planet is in a highly eccentric orbit ($e \sim 0.5$), which would make it the most eccentric planet that is known to be transiting an M-dwarf star. We combined TESS and ground-based data obtained with the 1.0-m SAINT-EX, 0.60-m TRAPPIST-North and 1.2-m FLWO telescopes to find a planetary size of 2.2 $R_{\oplus}$ and an orbital period of 35.19 days. In addition, we make use of archival data, high-resolution imaging, and vetting packages to support our planetary interpretation. With its long period and high eccentricity, TOI-2257 b falls in a novel slice of parameter space. Despite the planet's low equilibrium temperature ($\sim$ 256 K), its host star's small size ($R_* = 0.311 \pm{0.015}$) and relative infrared brightness (K$_{mag}$ = 10.7) make it a suitable candidate for atmospheric exploration via transmission spectroscopy.
http://hdl.handle.net/2268/264930
https://ui.adsabs.harvard.edu/abs/2021arXiv211101749S
https://arxiv.org/pdf/2111.01749.pdf

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