ExoAtmospheres
IAC community database for exoplanet atmospheric observations
LTT 9779 b
| Planet status | Confirmed |
|---|---|
| Planet type | UltraHot Neptune |
| Period | 0.7920641 d |
| Mass | 0.0923 MJ 29.33294 M⊕ |
| Radius | 0.4211 RJ 4.71632 R⊕ |
| Semi major axis | 0.01679 AU |
| Star name | LTT 9779 |
| Star distance | 80.6 pc |
| Star teff | 5445 K |
| Star radius | 0.92 R☉ |
| Temperature (calculated) | 2000 K |
| V | 9.76 mag |
| J | 8.446 mag |
| K | 8.016 mag |
| Alternate names | TOI-193 b |
| Exoplanet Encyclopaedia |  |
Molecules
He: No detection H2O: Detection
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G-B: High resolution IR | Exploring the ultrahot Neptune LTT 9779 b with CRIRES+. Non-detection of helium transmission spectra and detection of H$_2$O on the dayside2026, S. Liu, F. Yan et al. |
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Featureless spectra: Detection Cloudy: Detection
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JWST-NIRSpec | Cool, Cloudy Nights on an Ultrahot Neptune: A Panchromatic NIRISS/NIRSpec Transmission Spectrum of LTT 9779 b2026, Sarah Stamer, Diana Dragomir et al. |
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Reflected Light: Detection Albedo: 0.88 Dayside Temperature (occultation): 9999 K |
G-B: High resolution visible | High-resolution detection of reflected light from the exo-Neptune LTT-9779 b2026, F |
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CO: Detection CO2: Detection Molecular ratios: C/O, etc...: Detection Cloudy: Detection SiO: Upper limit VO: Upper limit TiO: Upper limit
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JWST-NIRSpec | Glossy Silicate Clouds on the Scorched Dayside of LTT9779b2026, Suman Saha, James S. Jenkins et al. |
Dayside clouds, with Mg2SiO4(s) (silicate) condensation. High reflective cloud deck, rather than a high-metallicity. |
TiO: No detection
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G-B: High resolution visible | No TiO detected in the hot Neptune-desert planet LTT-9779 b in reflected light at high spectral resolution2025, Sophia R. Vaughan, Jayne L. Birkby et al. |
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CO: Detection CO2: Detection H2O: Detection SO2: Detection
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JWST-NIRSpec | Heat Reveals What Clouds Conceal: Global Carbon & Longitudinally Asymmetric Chemistry on LTT 9779 b2025, Reza Ashtari, Sean Collins et al. |
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Albedo: 0.73 Dayside Temperature (occultation): 99999 K |
CHEOPS | A High Geometric Albedo for LTT9779b Points Towards a Metal-rich Atmosphere and Silicate Clouds2025, Suman Saha, James S. Jenkins et al. |
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OH: Upper limit FeH: Upper limit
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HST WFC3 | HST/WFC3 Constraints on the Abundances of OH and FeH in the Atmosphere of the Ultra-Hot Neptune LTT-9779 b2025, Li Zhou, Xinyue Ma et al. |
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Cloudy: Detection
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HST WFC3 | Constraining the Scattered Light properties of LTT 9779 b Using HST/WFC3 UVIS2025, Michael Radica, Jake Taylor et al. |
Non detection of eclipse |
Featureless spectra: Detection H: Upper limit Na: Upper limit
|
G-B: High resolution visible | A closer look at LTT\,9779b: The ESPRESSO endeavour to pierce the atmospheric veil2025, R. Ramírez Reyes, James S. Jenkins et al. |
No atomic or molecular features detected. Compatible with a high metallicity atmosphere or clouds in altitude |
Albedo: 0.5 Phase curve: Yes Dayside Temperature (occultation): 2260 K |
JWST-NIRISS | Highly reflective white clouds on the western dayside of an exo-Neptune2025, Louis-Philippe Coulombe, Michael Radica et al. |
Dayside terminators have different albedos. Asymmetric dayside in reflected light |
He: No detection
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G-B: High resolution IR | A High-Resolution Non-Detection of Escaping Helium In The Ultra-Hot Neptune LTT 9779b: Evidence for Weakened Evaporation2024, Shreyas Vissapragada, Patrick McCreery et al. |
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Featureless spectra: Detection
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JWST-NIRISS | Muted Features in the JWST NIRISS Transmission Spectrum of Hot-Neptune LTT 9779 b2024, Michael Radica, Louis-Philippe Coulombe et al. |
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FeH: Detection CO2: Detection H2O: Detection He: Upper limit
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HST WFC3 | Characterising a World Within the Hot Neptune Desert: Transit Observations of LTT 9779 b with HST WFC32023, Billy Edwards, Quentin Changeat et al. |
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Phase curve: Yes |
Spitzer | Phase Curves of Hot Neptune LTT 9779b Suggest a High-Metallicity Atmosphere2020, Ian J. M. Crossfield, Diana Dragomir et al. |