Issue |
A&A
Volume 687, July 2024
|
|
---|---|---|
Article Number | A48 | |
Number of page(s) | 27 | |
Section | Planets and planetary systems | |
DOI | https://doi.org/10.1051/0004-6361/202347981 | |
Published online | 28 June 2024 |
TOI-4336 A b: A temperate sub-Neptune ripe for atmospheric characterization in a nearby triple M-dwarf system
1
Astrobiology Research Unit, Université de Liège,
19C Allée du 6 Août,
4000
Liège, Belgium
e-mail: mathilde.timmermans@uliege.be
2
School of Physics & Astronomy, University of Birmingham,
Edgbaston, Birmingham
B15 2TT, UK
3
Department of Earth, Atmospheric and Planetary Science, Massachusetts Institute of Technology,
77 Massachusetts Avenue,
Cambridge, MA
02139, USA
4
Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology,
Cambridge, MA
02139, USA
5
Department of Physics, UC San Diego,
9500 Gilman Drive,
La Jolla, CA
92093, USA
6
Kavli Institute for Particle Astrophysics & Cosmology, Stanford University,
Stanford, CA
94305, USA
7
Instituto de Astrofísica de Canarias (IAC),
38205 La Laguna,
Tenerife, Spain
8
Cerro Tololo Inter-American Observatory/NSF’s NOIRLab,
Casilla 603,
La Serena
1700000, Chile
9
Department of Astronomy & Astrophysics, UC San Diego,
9500 Gilman Drive,
La Jolla, CA
92093, USA
10
Center for Astrophysics | Harvard & Smithsonian,
60 Garden Street,
Cambridge, MA,
02138, USA
11
Univ. Grenoble Alpes, CNRS, IPAG,
38000
Grenoble, France
12
Observatoire de Genève, Département d’Astronomie, Université de Genève,
Chemin Pegasi 51b,
1290
Versoix, Switzerland
13
Dpto. Física Teórica y del Cosmos, Universidad de Granada,
18071
Granada, Spain
14
LESIA, Observatoire de Paris, Université PSL, CNRS, Sorbonne Université, Université Paris Cité,
5 place Jules Janssen,
92195
Meudon, France
15
AIM, CEA, CNRS, Université Paris-Saclay, Université de Paris,
91191
Gif-sur-Yvette, France
16
Department of Physics & Astronomy, Vanderbilt University,
6301 Stevenson Center Ln.,
Nashville, TN
37235, USA
17
Department of Physics, Engineering and Astronomy, Stephen F. Austin State University,
1936 North St,
Nacogdoches, TX
75962, USA
18
Carl Sagan Institute, Cornell University,
302 Space Science Building,
14850
Ithaca, NY, USA
19
Department of Astrophysical and Planetary Sciences, University of Colorado Boulder,
Boulder, CO
80309, USA
20
Laboratoire d’Astrophysique de Bordeaux, CNRS and Université de Bordeaux,
Allée Geoffroy St. Hilaire,
33165
Pessac, France
21
Oukaimeden Observatory, High Energy Physics and Astrophysics Laboratory, Faculty of sciences Semlalia, Cadi Ayyad University,
Marrakech, Morocco
22
Caltech/IPAC-NASA Exoplanet Science Institute,
770 S. Wilson Avenue,
Pasadena, CA
91106, USA
23
Space Sciences, Technologies and Astrophysics Research (STAR) Institute, Université de Liège,
Allée du 6 Août 19C,
4000
Liège, Belgium
24
Center for Space and Habitability, University of Bern,
Gesellschaftsstrasse 6,
3012,
Bern, Switzerland
25
Center for Computational Astrophysics, Flatiron Institute,
New York, NY, USA
26
Universidad Nacional Autónoma de México, Instituto de Astronomía,
AP 70-264,
Ciudad de México
04510, Mexico
27
Cavendish Laboratory,
JJ Thomson Avenue,
Cambridge
CB3 0HE, UK
28
SUPA Physics and Astronomy, University of St. Andrews,
Fife,
KY16 9SS,
Scotland, UK
29
European Space Agency (ESA), European Space Research and Technology Centre (ESTEC),
Keplerlaan 1,
2201 AZ
Noordwijk, The Netherlands
30
NASA Ames Research Center,
Moffett Field, CA
94035, USA
31
Department of Physics and Astronomy, The University of North Carolina at Chapel Hill,
Chapel Hill, NC
27599-3255, USA
32
Departamento de Astrofísica, Universidad de La Laguna (ULL),
38206
La Laguna, Tenerife, Spain
33
Instituto de Astrofísica de Andalucía (IAA-CSIC),
Glorieta de la Astronomía s/n,
18008
Granada, Spain
34
ETH Zurich, Department of Physics,
Wolfgang-Pauli-Strasse 2,
8093
Zurich, Switzerland
35
Royal Astronomical Society,
Burlington House,
Piccadilly, London
W1J 0BQ, UK
36
Department of Astronomy, University of Maryland,
College Park, MD
20742, USA
37
Istituto Nazionale di Astrofisica, Osservatorio Astrofisico di Torino,
Strada Osservatorio 20,
10025
Pino Torinese, Italy
38
Kotizarovci Observatory,
Sarsoni 90,
51216
Viskovo, Croatia
39
SETI Institute,
Mountain View, CA
94043 USA
NASA Ames Research Center,
Moffett Field, CA
94035, USA
40
Department of Astrophysical Sciences, Princeton University,
Princeton, NJ
08544, USA
Received:
15
September
2023
Accepted:
18
April
2024
Context. 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.
Aims. 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.
Methods. We validated 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.
Results. The newly discovered exoplanet TOI-4336 A b has a radius of 2.1 ± 0.1 R⊕. Its host star is an M3.5-dwarf star with a mass of 0.33 ± 0.01 M⊙ and a radius of 0.33 ± 0.02 R⊙, and is a 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, which is 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.
Key words: techniques: photometric / planets and satellites: detection / planets and satellites: individual: TOI-4336 A b / stars: low-mass / planetary systems
© The Authors 2024
Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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