ExoAtmospheres
IAC community database for exoplanet atmospheric observations
TRAPPIST-1 b
| Planet status | Confirmed |
|---|---|
| Planet type | Warm Earth-size |
| Period | 1.51087081 d |
| Mass | 0.0027 MJ 0.85806 M⊕ |
| Radius | 0.0969 RJ 1.08528 R⊕ |
| Semi major axis | 0.01111 AU |
| Star name | TRAPPIST-1 |
| Star distance | 12.1 pc |
| Star teff | 2560 K |
| Star radius | 0.117 R☉ |
| Temperature (calculated) | 503 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): 490 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. |
|
H: Upper limit
|
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 |
Dayside Temperature (occultation): 500 K |
JWST-MIRI | Combined analysis of the 12.8 and 15 $μm$ JWST/MIRI eclipse observations of TRAPPIST-1 b2024, Elsa Ducrot, Pierre-Olivier Lagage et al. |
Data consistent with an airless planet model or a thick, pure-CO2 atmosphere with photochemical hazes. |
Featureless spectra: Detection
|
JWST-NIRISS | Atmospheric Reconnaissance of TRAPPIST-1 b with JWST/NIRISS: Evidence for Strong Stellar Contamination in the Transmission Spectra2023, Olivia Lim, Björn Benneke et al. |
Strong detection of stellar activity contamination |
CO2: No detection Dayside Temperature (occultation): 503 K |
JWST-MIRI | Thermal emission from the Earth-sized exoplanet TRAPPIST-1 b using JWST2023, Thomas P. Greene, Taylor J. Bell et al. |
Little or no planetary atmosphere redistributing radiation from the host star |
He: No detection
|
G-B: High resolution IR | Non-detection of Helium in the upper atmospheres of TRAPPIST-1b, e and f2021, Vigneshwaran Krishnamurthy, Teruyuki Hirano et al. |