ExoAtmospheres
IAC community database for exoplanet atmospheric observations
WASP-39 b
| Planet status | Confirmed |
|---|---|
| Planet type | Hot Jupiter |
| Period | 4.055259 d |
| Mass | 0.28 MJ 88.984 M⊕ |
| Radius | 1.27 RJ 14.224 R⊕ |
| Semi major axis | 0.0486 AU |
| Star name | WASP-39 |
| Star distance | 230 pc |
| Star teff | 5400 K |
| Star radius | 0.895 R☉ |
| Temperature (calculated) | 1117 K |
| V | 12.11 mag |
| J | 10.663 mag |
| K | 10.202 mag |
| Alternate names | |
| Exoplanet Encyclopaedia |  |
Molecules
H2O: Detection CO: Detection CO2: Detection SiO2: Detection Molecular ratios: C/O, etc...: Detection
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JWST-NIRSpec | Precise Determination of the Metallicity and C/O of WASP-39~b From a Single JWST Instrument Mode with Phase-Resolved Cross-Correlation Retrievals2026, Arjun B. Savel, Eliza M. -R. Kempton et al. |
They apply cross-correlation technique to the native resolution spectra |
H2O: Detection CO: Detection CO2: Detection
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JWST-NIRSpec | Testing the performance of cross-correlation techniques to search for molecular features in JWST NIRSpec G395H observations of transiting exoplanets2025, Emma Esparza-Borges, Mercedes López-Morales et al. |
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H2O: Detection CO2: Detection K: Detection Na: Detection SiO: Detection Cloudy: Detection
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JWST-NIRSpec | A new look into the atmospheric composition of WASP-39 b2025, Sushuang Ma, Arianna Saba et al. |
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Molecular ratios: C/O, etc...: Detection
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JWST-NIRSpec | Asymmetry and Dynamical Constraints in 2-Limbs Retrieval of WASP-39 b Inferring from JWST Data2025, Zixin Chen, Jianghui Ji et al. |
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Na: Detection K: Detection H2O: Detection CO: Detection CO2: Detection SO2: Detection
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JWST-NIRSpec | A Benchmark JWST Near-Infrared Spectrum for the Exoplanet WASP-39b2024, A. L. Carter, E. M. May et al. |
Reanalysis of all ERC observations covering from 0.5 to 5.2 micron. |
CO2: Detection H2O: Detection
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JWST-NIRSpec | Inhomogeneous terminators on the exoplanet WASP-39 b2024, Néstor Espinoza, Maria E. Steinrueck et al. |
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SO2: Detection H2O: Detection Molecular ratios: C/O, etc...: Detection
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JWST-MIRI | Sulphur dioxide in the mid-infrared transmission spectrum of WASP-39b2024, Diana Powell, Adina D. Feinstein et al. |
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CO: Detection
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JWST-NIRSpec | Detection of Carbon Monoxide in the Atmosphere of WASP-39b Applying Standard Cross-Correlation Techniques to JWST NIRSpec G395H Data2023, Emma Esparza-Borges, Mercedes López-Morales et al. |
Using Cross-correlation method |
He: Upper limit
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G-B: High resolution IR | Homogeneous search for helium in the atmosphere of 11 gas giant exoplanets with SPIRou2023, R. Allart, P. -B. Lemée-Joliecoeur et al. |
3sigma upper limit of <2.05 % with SPIRou. |
Na: No detection K: No detection Featureless spectra: Detection
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G-B: Low resolution visible | Featureless transmission spectra of 12 giant exoplanets observed by GTC/OSIRIS2023, C. Jiang, G. Chen et al. |
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CO: Detection
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JWST-NIRSpec | Detection of carbon monoxide's 4.6 micron fundamental band structure in WASP-39b's atmosphere with JWST NIRSpec G395H2023, David Grant, Joshua D. Lothringer et al. |
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K: Detection Cloudy: Detection Molecular ratios: C/O, etc...: Detection H2O: Detection
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JWST-NIRISS | Early Release Science of the exoplanet WASP-39b with JWST NIRISS2022, Adina D. Feinstein, Michael Radica et al. |
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SO2: Detection
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JWST-NIRSpec | Direct Evidence of Photochemistry in an Exoplanet Atmosphere2022, Shang-Min Tsai, Elspeth K. H. Lee et al. |
Direct Evidence of Photochemistry in an Exoplanet Atmosphere |
Molecular ratios: C/O, etc...: Detection H2O: Detection CH4: Upper limit
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JWST-NIRCam | Early Release Science of the exoplanet WASP-39b with JWST NIRCam2022, Eva-Maria Ahrer, Kevin B. Stevenson et al. |
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SO2: Detection CO2: Detection H2O: Detection Molecular ratios: C/O, etc...: Detection
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JWST-NIRSpec | Early Release Science of the Exoplanet WASP-39b with JWST NIRSpec G395H2022, Lili Alderson, Hannah R. Wakeford et al. |
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Na: Detection H2O: Detection CO2: Detection CO: Detection CH4: No detection
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JWST-NIRSpec | Early Release Science of the exoplanet WASP-39b with JWST NIRSpec PRISM2022, Z. Rustamkulov, D. K. Sing et al. |
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CO2: Detection
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JWST-NIRSpec | Identification of carbon dioxide in an exoplanet atmosphere2022, The JWST Transiting Exoplanet Community Early Release Science Team, Eva-Maria Ahrer et al. |
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H2O: Detection
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HST WFC3 | A Population Study of Gaseous Exoplanets2018, Tsiaras, A., Waldmann, I. P. et al. |
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H2O: Detection
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HST WFC3 | The Complete Transmission Spectrum of WASP-39b with a Precise Water Constraint2018, Wakeford, H. R., Sing, D. K. et al. |
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Na: Detection
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HST STIS | A continuum from clear to cloudy hot-Jupiter exoplanets without primordial water depletion2015, David K. Sing, Jonathan J. Fortney et al. |
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Isotopic fractions: Detection H2O: Detection
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JWST-NIRISS | Astro-ph arXiv:2607.19579 | |
SO2: Detection CH4: Upper limit H2O: Detection
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JWST-MIRI | Astro-ph arXiv:2609.05264 |