Supernova Siblings and their Parent Galaxies in the Zwicky Transient Facility Bright Transient Surve

Abstract

Supernova (SN) siblings -- two or more SNe in the same parent galaxy -- are useful tools for exploring progenitor stellar populations as well as properties of the host galaxies such as distance, star formation rate, dust extinction, and metallicity. Since the average SN rate for a Milky Way-type galaxy is just one per century, a large imaging survey is required to discover an appreciable sample of SN siblings. From the wide-field Zwicky Transient Facility (ZTF) Bright Transient Survey (BTS; which aims for spectroscopic completeness for all transients which peak brighter than $r<$18.5 mag) we present 10 SN siblings in 5 parent galaxies. For each of these families we analyze the SN's location within the host and its underlying stellar population, finding agreement with expectations that SNe from more massive progenitors are found nearer to their host core and in regions of more active star formation. We also present an analysis of the relative rates of core collapse and thermonuclear SN siblings, finding a significantly lower ratio than past SN sibling samples due to the unbiased nature of the ZTF.

14 pages, 4 tables, 7 figures, accepted to MNRAS

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• A Systematic Study of Ia-CSM Supernovae from the ZTF Bright Transient Survey
• Family dispute: do Type IIP supernova siblings agree on their distance?
• Using Rest-Frame Optical and NIR Data from the RAISIN Survey to Explore the Redshift Evolution of Dust Laws in SN Ia Host Galaxies
• Searching for late-time interaction signatures in Type Ia supernovae from the Zwicky Transient Facility
• An archival search for type Ia supernova siblings
• A search for gravitationally lensed supernovae within the Zwicky Transient Facility public survey
• ZTF-observed late-time signals of pre-ZTF transients
• ZTF SN~Ia DR2: Cosmology-independent constraints on Type Ia supernova standardisation from supernova siblings