Table · dataset · 2022
LCs and spectroscopic observations of AT2018cow
Listed in IVOA Registry (Virtual Observatory)
We present our photometric and spectroscopic observations of the peculiar transient AT2018cow.
Description
The multiband photometry covers from peak to ~70days, and the spectroscopy ranges from 5 to ~50days. The rapid rise (t_r_<~2.9days), high luminosity (M_V,peak_~-20.8mag), and fast decline after peak make AT2018cow stand out from any other optical transients, whereas we find that its light curves show a high resemblance to those of Type Ibn supernovae.
Moreover, the spectral energy distribution remains at a high temperature of ~14000K at t>15days after discovery. The spectra are featureless in the first 10days, while some broad emission lines due to H, He, C, and O emerge later, with velocity declining from ~14000 to ~3000km/s at the end of our observations. Narrow and weak He I emission lines emerge in the spectra at t>20days after discovery.
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These emission lines are reminiscent of the features seen in interacting supernovae like the Type Ibn and IIn subclasses. We fit the bolometric light curves with a model of circumstellar interaction and radioactive decay of ^56^Ni and find a good fit with ejecta mass M_ej_~3.16M_{sun}_, circumstellar medium (CSM) mass M_CSM_~0.04M_{sun}_, and ejected ^56^Ni mass M_56Ni_~0.23M_{sun}_. The CSM shell might be formed in an eruptive mass ejection of the progenitor star.
Furthermore, the host environment of AT2018cow implies a connection of AT2018cow with massive stars. Combining observational properties and the light-curve fitting results, we conclude that AT2018cow might be a peculiar interacting supernova that originated from a massive star.
Links
Where it is published
- Reference page cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/910/42 ↗
landing page · from IVOA Registry
Documentation and papers
- ADS 2021ApJ...910...42X ui.adsabs.harvard.edu/abs/2021ApJ...910...42X ↗
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/apj/910/42 ↗
catalogue entry · from IVOA Registry
Topics
- From keywords
- Astronomy & Astrophysics
- Inferred from text
- Astronomical sciences 74%
Provenance · 1 source records, 10 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| IVOA Registry (Virtual Observatory) | ivo://cds.vizier/j/apj/910/42 | 15 d ago | JSON v1 |
| Field | Assertion | Extractor | Evidence |
|---|---|---|---|
| access_level | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| concepts[field].anzsrc:group:5101 | enrichment · IVOA Registry | taxonomy-embedding@1.1.0 | title+keywords+description (74%) |
| 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 | |
| concepts[modality].ivoa_waveband:optical | 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 |