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A Systematic Study of Ia-CSM Supernovae from the ZTF Bright Transient Survey
Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).ORCID iD: 0000-0003-1546-6615
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Number of Authors: 392023 (English)In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 948, no 1, article id 52Article in journal (Refereed) Published
Abstract [en]

Among the supernovae (SNe) that show strong interaction with a circumstellar medium (CSM), there is a rare subclass of Type Ia supernovae, SNe Ia-CSM, which show strong narrow hydrogen emission lines much like SNe IIn but on top of a diluted Type Ia spectrum. The only previous systematic study of this class identified 16 SNe Ia-CSM, eight historic and eight from the Palomar Transient Factory (PTF). Now using the successor survey to PTF, the Zwicky Transient Facility (ZTF), we have classified 12 additional SNe Ia-CSM through the systematic Bright Transient Survey (BTS). Consistent with previous studies, we find these SNe to have slowly evolving optical light curves with peak absolute magnitudes between -19.1 and -21, spectra having weak H ss and large Balmer ldecrements of similar to 7. Out of the 10 SNe from our sample observed by NEOWISE, nine have 3 sigma detections, with some SNe showing a reduction in the red wing of Ha, indicative of newly formed dust. We do not find our SN Ia-CSM sample to have a significantly different distribution of equivalent widths of He I.5876 than SNe IIn as observed in Silverman et al. The hosts tend to be late-type galaxies with recent star formation. We derive a rate estimate of 29+(27)(21) Gpc(-3) yr(-1) for SNe Ia-CSM, which is similar to 0.02%-0.2% of the SN Ia rate. We also identify six ambiguous SNe IIn/Ia-CSM in the BTS sample and including them gives an upper limit rate of 0.07%-0.8%. This work nearly doubles the sample of well-studied Ia-CSM objects in Silverman et al., increasing the total number to 28.

Place, publisher, year, edition, pages
2023. Vol. 948, no 1, article id 52
Keywords [en]
Unified Astronomy Thesaurus concepts: Supernovae (1668), Type Ia supernovae (1728)
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:su:diva-218365DOI: 10.3847/1538-4357/acbc16ISI: 000982386400001Scopus ID: 2-s2.0-85157998944OAI: oai:DiVA.org:su-218365DiVA, id: diva2:1776730
Available from: 2023-06-28 Created: 2023-06-28 Last updated: 2023-06-28Bibliographically approved

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Sollerman, JesperSchulze, SteveKool, Erik C.Pearson Johansson, JoelSchweyer, Tassilo

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