ExoAtmospheres
IAC community database for exoplanet atmospheric observations
TRAPPIST-1 d
| Planet status | Confirmed |
|---|---|
| Planet type | Temperate Earth-size |
| Period | 4.04961 d |
| Mass | 0.0013 MJ 0.41314 M⊕ |
| Radius | 0.0689 RJ 0.77168 R⊕ |
| Semi major axis | 0.02144 AU |
| Star name | TRAPPIST-1 |
| Star distance | 12.1 pc |
| Star teff | 2560 K |
| Star radius | 0.117 R☉ |
| Temperature (calculated) | 288 K |
| V | 18.798 mag |
| J | 11.354 mag |
| K | 10.296 mag |
| Alternate names | |
| Exoplanet Encyclopaedia |  |
Molecules
Featureless spectra: Detection
|
JWST-NIRSpec | Strict limits on potential secondary atmospheres on the temperate rocky exo-Earth TRAPPIST-1 d2025, Caroline Piaulet-Ghorayeb, Björn Benneke et al. |
Strict limits on possible atmospheric composition |
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 |