TOI-4336 A b: A temperate sub-Neptune ripe for atmospheric characterization in a nearby triple M-dwarf system

[en] Small planets transiting bright nearby stars are essential to our understanding of the formation and evolution of exoplanetary systems. However, few constitute prime targets for atmospheric characterization, and even fewer are part of multiple star systems. This work aims to validate TOI-4336 A b, a sub-Neptune-sized exoplanet candidate identified by the TESS space-based transit survey around a nearby M-dwarf. We validate the planetary nature of TOI-4336 A b through the global analysis of TESS and follow-up multi-band high-precision photometric data from ground-based telescopes, medium- and high-resolution spectroscopy of the host star, high-resolution speckle imaging, and archival images. The newly discovered exoplanet TOI-4336 A b has a radius of 2.1 +- 0.1R_sun. Its host star is an M3.5-dwarf star of mass 0.33 +- 0.01M_sun and radius 0.33 +- 0.02R_sun member of a hierarchical triple M-dwarf system 22 pc away from the Sun. The planet's orbital period of 16.3 days places it at the inner edge of the Habitable Zone of its host star, the brightest of the inner binary pair. The parameters of the system make TOI-4336 A b an extremely promising target for the detailed atmospheric characterization of a temperate sub-Neptune by transit transmission spectroscopy with JWST.

Disciplines :

Space science, astronomy & astrophysics

Author, co-author :

Timmermans, Mathilde ; Université de Liège - ULiège > Astrobiology

Dransfield, G.

Gillon, Michaël ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO)

Triaud, A. H. M. J.

Rackham, B. V.

Aganze, C.

Barkaoui, Khalid ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > Exoplanets in Transit: Identification and Characterization

Briceño, C.

Burgasser, A. J.

Collins, K. A.

More authors (47 more)

Language :

English

Title :

TOI-4336 A b: A temperate sub-Neptune ripe for atmospheric characterization in a nearby triple M-dwarf system

Publication date :

01 April 2024

Journal title :

Astronomy and Astrophysics

ISSN :

0004-6361

eISSN :

1432-0746

Publisher :

EDP Sciences

Volume :

687

Pages :

A48

Peer reviewed :

Peer reviewed

Additional URL :

https://ui.adsabs.harvard.edu/abs/2024arXiv240412722T
10.48550/arXiv.2404.12722

Commentary :

27 pages, 19 figures, 7 tables. Accepted for publication in A&A

Available on ORBi :

since 03 July 2024

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