ExoAtmospheres
IAC community database for exoplanet atmospheric observations
TRAPPIST-1 c
| Planet status | Confirmed |
|---|---|
| Planet type | Temperate Earth-size |
| Period | 2.4218233 d |
| Mass | 0.0043 MJ 1.36654 M⊕ |
| Radius | 0.0942 RJ 1.05504 R⊕ |
| Semi major axis | 0.01521 AU |
| Star name | TRAPPIST-1 |
| Star distance | 12.1 pc |
| Star teff | 2560 K |
| Star radius | 0.117 R☉ |
| Temperature (calculated) | 341 K |
| V | 18.798 mag |
| J | 11.354 mag |
| K | 10.296 mag |
| Alternate names | |
| Exoplanet Encyclopaedia |  |
Molecules
Featureless spectra: Detection Phase curve: Yes Dayside Temperature (occultation): 369 K |
JWST-MIRI | First JWST thermal phase curves of temperate terrestrial exoplanets reveal no thick atmosphere around TRAPPIST-1 b and c2025, Michaël Gillon, Elsa Ducrot et al. |
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H: Upper limit
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HST STIS | Hubble's Multi-Year Search for Exospheres in the TRAPPIST-1 System Reveals Frequent Microflares2025, David Berardo, Julien de Wit et al. |
Lya is not very constrained due to the effect of microflares in the out-of-transit baseline, transit depth <20% at 5σ |
Featureless spectra: Detection
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JWST-NIRSpec | Stellar Contamination Correction Using Back-to-Back Transits of TRAPPIST-1 b and c2024, Alexander D. Rathcke, Lars A. Buchhave et al. |
This method enables epoch-specific stellar contamination corrections |
Featureless spectra: Detection
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JWST-NIRISS | Promise and Peril: Stellar Contamination and Strict Limits on the Atmosphere Composition of TRAPPIST-1c from JWST NIRISS Transmission Spectra2024, Michael Radica, Caroline Piaulet-Ghorayeb et al. |
Limits on the posible atmospheric compositions |
Phase curve: Yes Dayside Temperature (occultation): 380 K |
JWST-MIRI | No thick carbon dioxide atmosphere on the rocky exoplanet TRAPPIST-1 c2023, Zieba, Sebastian, Kreidberg, Laura et al. |