ExoAtmospheres
IAC community database for exoplanet atmospheric observations
TRAPPIST-1 h
| Planet status | Confirmed |
|---|---|
| Planet type | Cold Earth-size |
| Period | 20 d |
| Mass | 0.001 MJ 0.3178 M⊕ |
| Radius | 0.0674 RJ 0.75488 R⊕ |
| Semi major axis | 0.063 AU |
| Star name | TRAPPIST-1 |
| Star distance | 12.1 pc |
| Star teff | 2560 K |
| Star radius | 0.117 R☉ |
| Temperature (calculated) | 168 K |
| V | 18.798 mag |
| J | 11.354 mag |
| K | 10.296 mag |
| Alternate names | |
| Exoplanet Encyclopaedia |  |
Molecules
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 |
Featureless spectra: Detection
|
HST WFC3 | HST/WFC3 transmission spectroscopy of the cold rocky planet TRAPPIST-1h2022, L. J. Garcia, S. E. Moran et al. |
|
Featureless spectra: Upper limit
|
HST WFC3 | Near-infrared transmission spectrum of TRAPPIST-1 h using Hubble WFC3 G141 observations2021, A. Gressier, M. Mori et al. |
IR observations with HST/WFC3 G141. Flat line is the best retrieval model. |