ExoAtmospheres
IAC community database for exoplanet atmospheric observations
55 Cnc e
| Planet status | Confirmed |
|---|---|
| Planet type | Hot Super-Earth |
| Period | 0.7365478 d |
| Mass | 0.027 MJ 8.5806 M⊕ |
| Radius | 0.1737 RJ 1.94544 R⊕ |
| Semi major axis | 0.015439 AU |
| Star name | 55 Cnc |
| Star distance | 12.34 pc |
| Star teff | 5196 K |
| Star radius | 0.98 R☉ |
| Temperature (calculated) | 1996 K |
| V | 5.95 mag |
| J | 4.768 mag |
| K | 4.015 mag |
| Alternate names | TOI-1773 e, HD 75732 e |
| Exoplanet Encyclopaedia |  |
Molecules
CO: Detection
|
JWST-NIRCam | Strong and variable stratospheric CO emission from lava-planet 55 Cnc e observed with NIRCam/JWST2026, Ignas Snellen, Yamila Miguel et al. |
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Featureless spectra: Detection
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G-B: High resolution IR | Searching for Molecular Signatures in 14 Transiting Exoplanets with SPIRou2026, A. Masson, S. Vinatier et al. |
SPIRou cross-correlation observations does not show molecular signals |
Dayside Temperature (occultation): 2000 K |
JWST-NIRCam | JWST reveals a rapid and strong day side variability of 55 Cancri e2024, J. A. Patel, A. Brandeker et al. |
Occultation depths in two bandpasses are highly variable. |
He: Upper limit
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G-B: High resolution IR | Probing atmospheric escape through metastable He I triplet lines in 15 exoplanets observed with SPIRou2024, A. Masson, S. Vinatier et al. |
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Molecular ratios: C/O, etc...: Detection Dayside Temperature (occultation): 999999 K |
JWST-MIRI | A secondary atmosphere on the rocky exoplanet 55 Cancri e2024, Renyu Hu, Aaron Bello-Arufe et al. |
Detection of a secondary atmosphere, undetermined composition |
Fe: Upper limit
|
G-B: High resolution visible | A Non-Detection of Iron in the First High-Resolution Emission Study of the Lava Planet 55 Cnc e2023, Kaitlin C. Rasmussen, Miles H. Currie et al. |
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Phase curve: Yes |
CHEOPS | Investigating the visible phase curve variability of 55 Cnc e2023, E. A. Meier Valdés, B. M. Morris et al. |
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Phase curve: Yes |
Spitzer | Revisiting the Iconic Spitzer Phase Curve of 55 Cancri e: Hotter Dayside, Cooler Nightside and Smaller Phase Offset2022, Samson J. Mercier, Lisa Dang et al. |
Reanalysis. Negligible hot spot offset |
Fe: Upper limit Fe+: Upper limit K: Upper limit Mg: Upper limit Ca: Upper limit Ca+: Upper limit
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G-B: High resolution visible | The PEPSI Exoplanet Transit Survey (PETS) I: Investigating the presence of a silicate atmosphere on the super-Earth 55 Cnc e2022, Engin Keles, Matthias Mallonn et al. |
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He: No detection
|
G-B: High resolution IR | No escaping helium from 55 Cnc e2020, Michael Zhang, Heather A. Knutson et al. |
No detection of escaping helium, implying lack of H2/He atmosphere |
Na: Upper limit H: Upper limit
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G-B: High resolution visible | HORuS transmission spectroscopy of 55 Cnc e2020, Tabernero, H. M., Allende Prieto, C. et al. |
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Na: Upper limit Ca+: Upper limit
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G-B: High resolution visible | Search for an exosphere in sodium and calcium in the transmission spectrum of exoplanet 55 Cancri e2016, Ridden-Harper, A. R., Snellen, I. A. G. et al. |
Tentative signals, but not significant |
H: Theoretical prediction He: Theoretical prediction HCN: Theoretical prediction
|
HST WFC3 | Detection of an Atmosphere Around the Super-Earth 55 Cancri e2016, Tsiaras, A., Rocchetto, M. et al. |
Evidence for a light (H/He) atmosphere, retrieval model with HCN is marginally favored |
Phase curve: Yes |
Spitzer | A map of the large day-night temperature gradient of a super-Earth exoplanet2016, Demory, Brice-Olivier, Gillon, Michael et al. |