Table · dataset · 2024
55 Cnc e JWST light curves and spectra
Listed in IVOA Registry (Virtual Observatory)
The nature of the close-in rocky planet 55 Cnc e is puzzling despite having been observed extensively.
Description
Its optical and infrared occultation depths show temporal variability, in addition to a phase curve variability observed in the optical. We wish to explore the possibility that the variability originates from the planet being in a 3:2 spin-orbit resonance, thus showing different sides during occultations.
We proposed and were awarded Cycle 1 time at the James Webb Space Telescope (JWST) to test this hypothesis. JWST/NIRCam (Near Infrared Camera) observed five occultations (secondary eclipses), of which four were observed within a week, of the planet simultaneously at 2.1 and 4.5um. While the former gives band-integrated photometry, the latter provides a spectrum between 3.9-5.0um.
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We find that the occultation depths in both bandpasses are highly variable and change between a non-detection (-5+/-6ppm and 7+/-9ppm) to 96+/-8ppm and 119^+34^_-19_ppm at 2.1um and 4.5um, respectively. Interestingly, the variations in both bandpasses are not correlated and do not support the 3:2 spin-orbit resonance explanation. The measured brightness temperature at 4.5um varies between 873-2256K and is lower than the expected dayside temperature of bare rock with no heat re-distribution (2500K) which is indicative of an atmosphere.
Our atmospheric retrieval analysis of occultation depth spectra at 4.5um finds that different visits statistically favour various atmospheric scenarios including a thin outgassed CO/CO2 atmosphere and a silicate rock vapour atmosphere. Some visits even support a flat line model. The observed variability could be explained by stochastic outgassing of CO/CO2, which is also hinted by retrievals.
Alternatively, the variability, observed at both 2.1 and 4.5um, could be the result of a circumstellar patchy dust torus generated by volcanism on the planet.
Links
Where it is published
- Reference page cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/690/A159 ↗
landing page · from IVOA Registry
Documentation and papers
- ADS 2024A&A...690A.159P ui.adsabs.harvard.edu/abs/2024A%26A...690A.159P ↗
publication · from IVOA Registry
Catalogue records · 2
- VOResource record dc.g-vo.org/oai.xml?verb=GetRecord&metadataPrefix=ivo_vor&identifier=ivo%3… ↗
metadata API · from IVOA Registry
- Registry record (GAVO) dc.g-vo.org/I/cds.vizier/j/a%2Ba/690/a159 ↗
catalogue entry · from IVOA Registry
Topics
- Stated by source
- Infrared
- From keywords
- Astronomy & Astrophysics
Provenance · 1 source records, 8 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| IVOA Registry (Virtual Observatory) | ivo://cds.vizier/j/a+a/690/a159 | 12 d ago | JSON v1 |
| Field | Assertion | Extractor | Evidence |
|---|---|---|---|
| access_level | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| concepts[field].local:field:astronomy | mapping · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| concepts[modality].ivoa_waveband:infrared | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| description | source · IVOA Registry | connector:ivoa_registry@1.0.0 | rr.resource.res_description |
| license_text | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| publication_date | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| title | source · IVOA Registry | connector:ivoa_registry@1.0.0 | rr.resource.res_title |
| updated_date | source · IVOA Registry | connector:ivoa_registry@1.0.0 |