ExoAtmospheres
IAC community database for exoplanet atmospheric observations
TOI-270 d
| Planet status | Confirmed |
|---|---|
| Planet type | Temperate Sub-Neptune |
| Period | 11.38014 d |
| Mass | 0.0132 MJ 4.19496 M⊕ |
| Radius | 0.19 RJ 2.128 R⊕ |
| Semi major axis | 0.0733 AU |
| Star name | TOI-270 |
| Star distance | 22.453 pc |
| Star teff | 3386 K |
| Star radius | 0.38 R☉ |
| Temperature (calculated) | 340 K |
| V | 12.6 mag |
| J | 9.099 mag |
| K | 8.251 mag |
| Alternate names | |
| Exoplanet Encyclopaedia |  |
Molecules
CH4: Detection CO2: Detection
|
JWST-MIRI | The Mid-Infrared Transmission Spectrum of the Temperate Sub-Neptune TOI-270 d2026, Måns Holmberg, Nikku Madhusudhan et al. |
Favouring the presence of atmospheric absorption at ln B = 2.8-5.3 |
CH4: Detection H2O: Detection CO2: Detection DMS: Upper limit DMDS: Upper limit
|
JWST-NIRISS | The atmospheric composition of TOI-270 d2025, Savvas Constantinou, Nikku Madhusudhan et al. |
|
CO2: Detection CH4: Detection
|
JWST-NIRSpec | Possible Hycean conditions in the sub-Neptune TOI-270 d2024, Måns HolmbergNikku Madhusudhan |
Hints of CS2 and H2O |
CH4: Detection CO2: Detection H2O: Detection
|
JWST-NIRSpec | JWST Reveals CH$_4$, CO$_2$, and H$_2$O in a Metal-rich Miscible Atmosphere on a Two-Earth-Radius Exoplanet2024, Björn Benneke, Pierre-Alexis Roy et al. |
potential signatures of SO2 at 4.0μm and CS2 at 4.6μm |
H2O: Detection
|
HST WFC3 | Hubble Space Telescope transmission spectroscopy for the temperate sub-Neptune TOI-270d: a possible hydrogen-rich atmosphere containing water vapour2022, Thomas Mikal-Evans, Nikku Madhusudhan et al. |
|
Featureless spectra: No detection
|
JWST-MIRI | Astro-ph arXiv:2609.05264 | Evidence for Methacrylonitrile, Isobutene, Benzonitrile features in the MIRI transmission spectrum |