Table · dataset · 2026
VLT/ERIS spectra 12 star with exoplanets
Listed in IVOA Registry (Virtual Observatory)
Constraining the link between the atmospheric composition of giant exoplanets and their formation history is a key goal of exoplanet studies.
Description
In particular, the atmospheric C/O ratio, metallicity, and CO isotopologue ratio - which are readily measurable with direct spectroscopic observations - are believed to be chemical tracers of the birth location of substellar and planetary companions. We aim to collect observational constraints for planet formation theories by performing a large and systematic survey of the atmospheric C/O ratio, metallicity, and isotopologue ratio.
We collected new K-band moderate-resolution R=11000 spectroscopic observations of 13 directly-imaged planetary-mass companions spanning the molecular snowlines of CO_2_, CO, and CH4 and with masses 4-30MJ with VLT/ERIS/SPIFFIER. Additionally, we gathered a large portion of the available archival observations for these targets, amounting to 40 spectra and 140 photometric fluxes. We performed spectral fits using self-consistent grid models and freely parametrisable models.
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We obtained robust estimates of the key atmospheric parameters by aggregating the results from the different models, thereby reducing modelling systematics. Using molecular mapping, we detect H2O and CO in 12 of our targets, as well as ^13^CO in HR 2562 B. With our multimodel spectral fitting strategy, we obtain stellar to superstellar C/O ratios - ranging between 0.4 and 0.8 - and predominantly superstellar metallicities - between -0.5 and 1.5dex - across all targets.
We measure a substantial enrichment of ^13^CO for HR 2562 B with ^12^CO/^13^CO=12.0^+4.5^_-3.3_. If corroborated by independent observations, it could indicate that the companion might have formed beyond the CO snowline and later migrated inwards to its current location. We find an anti-correlation (R=-0.58) between the atmospheric C/O ratio and the companion mass, consolidating previous results.
Links
Where it is published
- Reference page cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/708/A312 ↗
landing page · from IVOA Registry
Documentation and papers
- ADS 2026A&A...708A.312H ui.adsabs.harvard.edu/abs/2026A%26A...708A.312H ↗
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/708/a312 ↗
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/708/a312 | 11 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 |