Detection of an Earth-sized exoplanet orbiting the nearby ultracool dwarf star SPECULOOS-3

[en] Located at the bottom of the main sequence, ultracool dwarf stars are widespread in the solar neighbourhood. Nevertheless, their extremely low luminosity has left their planetary population largely unexplored, and only one of them, TRAPPIST-1, has so far been found to host a transiting planetary system. In this context, we present the SPECULOOS project’s detection of an Earth-sized planet in a 17 h orbit around an ultracool dwarf of M6.5 spectral type located 16.8 pc away. The planet’s high irradiation (16 times that of Earth) combined with the infrared luminosity and Jupiter-like size of its host star make it one of the most promising rocky exoplanet targets for detailed emission spectroscopy characterization with JWST. Indeed, our sensitivity study shows that just ten secondary eclipse observations with the Mid-InfraRed Instrument/Low-Resolution Spectrometer on board JWST should provide strong constraints on its atmospheric composition and/or surface mineralogy.

Disciplines :

Space science, astronomy & astrophysics

Author, co-author :

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

Pedersen, Peter P.

Rackham, Benjamin V.

Dransfield, Georgina

Ducrot, Elsa

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

Burdanov, Artem Y.

Schroffenegger, Urs

Gómez Maqueo Chew, Yilen

Lederer, Susan M.

More authors (75 more)

Language :

English

Title :

Detection of an Earth-sized exoplanet orbiting the nearby ultracool dwarf star SPECULOOS-3

Publication date :

2024

Journal title :

Nature Astronomy

eISSN :

2397-3366

Publisher :

Springer Nature, London, Gb

Peer reviewed :

Peer Reviewed verified by ORBi

Additional URL :

https://doi.org/10.1038/s41550-024-02271-2

Available on ORBi :

since 16 June 2024

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