Table · dataset · 2026
Kast and LRIS spectra of SNIa SN 2020hvf
Listed in IVOA Registry (Virtual Observatory)
We present nebular spectroscopy of SN 2020hvf, a Type Ia supernova (SNIa) with an early bump in its light curve.
Description
SN 2020hvf shares many spectroscopic and photometric similarities to the carbon-rich high-luminosity "03fg-like" SNe Ia. At >240 days after peak brightness, we detect unambiguous emission from [CaII] {lambda}{lambda}7291,7324, which is rarely observed in normal SNe Ia and only seen in peculiar subclasses.
SN 2020hvf displays "sawtooth" emission profiles near 7300{AA} that cannot be explained with single symmetric velocity components of [FeII], [NiII], and [CaII], indicating an asymmetric explosion. The broad [CaII] emission is best modeled by two velocity components offset by 1220km/s, which could be caused by ejecta associated with each star in the progenitor system, separated by their orbital velocity. For the first time in an SN Ia, we identify narrow (FWHM=180{\pm}40km/s) [CaII] emission, which we associate with a wind from a surviving, puffed-up companion star.
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Few published spectra have sufficient resolution and the signal-to-noise ratio necessary to detect similar narrow [CaII] emission; however, we have detected similar line profiles in other 03fg-like SNe Ia. The extremely narrow velocity width of [CaII] has only otherwise been observed in SNe Iax at late times. Since this event likely had a double-degenerate "super-Chandrasekhar" mass progenitor system, we suggest that a single white dwarf (WD) was fully disrupted and a wind from a surviving companion WD is producing the observed narrow emission.
It is unclear whether this unique progenitor and explosion scenario can explain the diversity of 03fg-like SNe Ia, potentially indicating that multiple progenitor channels contribute to this subclass.
Links
Where it is published
- Reference page cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/958/173 ↗
landing page · from IVOA Registry
Documentation and papers
- ADS 2023ApJ...958..173S ui.adsabs.harvard.edu/abs/2023ApJ...958..173S ↗
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/958/173 ↗
catalogue entry · from IVOA Registry
Topics
- Stated by source
- Optical
- From keywords
- Astronomy & Astrophysics
- Inferred from text
- Astronomical sciences 71%
Provenance · 1 source records, 9 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| IVOA Registry (Virtual Observatory) | ivo://cds.vizier/j/apj/958/173 | 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@1.0.0 | title+keywords+description (71%) |
| concepts[field].local:field:astronomy | mapping · 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 |