Gan, Tianjun; Soubkiou, Abderahmane; Wang, Sharon X; Benkhaldoun, Zouhair; Mao, Shude; Artigau, Étienne; Fouqué, Pascal; Arnold, Luc; Giacalone, Steven; Theissen, Christopher A; Aganze, Christian; Burgasser, Adam; Collins, Karen A; Shporer, Avi; Barkaoui, Khalid; Ghachoui, Mourad; Howell, Steve B; Lamman, Claire; Demangeon, Olivier D S; Burdanov, Artem; ... (2022). TESS discovery of a sub-Neptune orbiting a mid-M dwarf TOI-2136. Monthly notices of the Royal Astronomical Society, 514(3), pp. 4120-4139. Oxford University Press 10.1093/mnras/stac1448
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We present the discovery of TOI-2136 b, a sub-Neptune planet transiting a nearby M4.5V-type star every 7.85 d, identified through photometric measurements from the Transiting Exoplanet Survey Satellite (TESS) mission. The host star is located 33 pc away with a radius of R* = 0.34 ± 0.02 R⊙, a mass of 0.34±0.02M⊙
, and an effective temperature of 3342 ± 100 K. We estimate its stellar rotation period to be 75 ± 5 d based on archival long-term photometry. We confirm and characterize the planet based on a series of ground-based multiwavelength photometry, high-angular-resolution imaging observations, and precise radial velocities from Canada–France–Hawaii Telescope (CFHT)/SpectroPolarimètre InfraROUge (SPIRou). Our joint analysis reveals that the planet has a radius of 2.20 ± 0.17 R⊕ and a mass of 6.4 ± 2.4 M⊕. The mass and radius of TOI-2136 b are consistent with a broad range of compositions, from water-ice to gas-dominated worlds. TOI-2136 b falls close to the radius valley for M dwarfs predicted by thermally driven atmospheric mass-loss models, making it an interesting target for future studies of its interior structure and atmospheric properties.
Item Type: |
Journal Article (Original Article) |
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Division/Institute: |
08 Faculty of Science > Physics Institute > Space Research and Planetary Sciences 08 Faculty of Science > Physics Institute 10 Strategic Research Centers > Center for Space and Habitability (CSH) 08 Faculty of Science > Physics Institute > NCCR PlanetS |
UniBE Contributor: |
Demory, Brice-Olivier Denys, Schanche, Nicole Elizabeth, Wells, Robert Donald |
Subjects: |
500 Science > 530 Physics 500 Science > 520 Astronomy 000 Computer science, knowledge & systems 500 Science |
ISSN: |
0035-8711 |
Publisher: |
Oxford University Press |
Language: |
English |
Submitter: |
Danielle Zemp |
Date Deposited: |
29 Mar 2023 15:17 |
Last Modified: |
05 Apr 2024 07:16 |
Publisher DOI: |
10.1093/mnras/stac1448 |
BORIS DOI: |
10.48350/180957 |
URI: |
https://boris.unibe.ch/id/eprint/180957 |
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