English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

We report optical and near-infrared observations of SN 2012ca with the PublicESO Spectroscopy Survey of Transient Objects (PESSTO), spread over one yearsince discovery. The supernova (SN) bears many similarities to SN 1997cy and toother events classified as Type IIn but which have been suggested to have athermonuclear origin with narrow hydrogen lines produced when the ejecta impacta hydrogen-rich circumstellar medium (CSM). Our analysis, especially in thenebular phase, reveals the presence of oxygen, magnesium and carbon features.This suggests a core collapse explanation for SN2012ca, in contrast to thethermonuclear interpretation proposed for some members of this group. Wesuggest that the data can be explained with a hydrogen and helium deficient SNejecta (Type I) interacting with a hydrogen-rich CSM, but that the explosionwas more likely a Type Ic core-collapse explosion than a Type Ia thermonuclearone. This suggests two channels (both thermonuclear and stripped envelopecore-collapse) may be responsible for these SN 1997cy-like events.

SN 2012ca: a stripped envelope core-collapse SN interacting with dense circumstellar medium