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The zwicky transient facility bright transient survey. II. A public statistical sample for exploring supernova demographics

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  • Daniel A. Perley
  • Christoffer Fremling
  • Jesper Sollerman
  • Adam A. Miller
  • Aishwarya S. Dahiwale
  • Yashvi Sharma
  • Eric C. Bellm
  • Rahul Biswas
  • Thomas G. Brink
  • Rachel J. Bruch
  • Kishalay De
  • Richard Dekany
  • Andrew J. Drake
  • Dmitry A. Duev
  • Alexei V. Filippenko
  • Avishay Gal-Yam
  • Ariel Goobar
  • Matthew J. Graham
  • Melissa L. Graham
  • Anna Y.Q. Ho
  • Ido Irani
  • Mansi M. Kasliwal
  • S. R. Kulkarni
  • Ashish Mahabal
  • Frank J. Masci
  • Shaunak Modak
  • James D. Neill
  • Jakob Nordin
  • Reed L. Riddle
  • Maayane T. Soumagnac
  • Nora L. Strotjohann
  • Steve Schulze
  • Kirsty Taggart
  • Anastasios Tzanidakis
  • Richard S. Walters
  • Lin Yan
Article number35
<mark>Journal publication date</mark>19/11/2020
<mark>Journal</mark>Astrophysical Journal
Issue number1
Number of pages24
Publication StatusPublished
<mark>Original language</mark>English


We present a public catalog of transients from the Zwicky Transient Facility (ZTF) Bright Transient Survey, a magnitude-limited (m < 19 mag in either the g or r filter) survey for extragalactic transients in the ZTF public stream. We introduce cuts on survey coverage, sky visibility around peak light, and other properties unconnected to the nature of the transient, and show that the resulting statistical sample is spectroscopically 97% complete at <18 mag, 93% complete at <18.5 mag, and 75% complete at <19 mag. We summarize the fundamental properties of this population, identifying distinct duration-luminosity correlations in a variety of supernova (SN) classes and associating the majority of fast optical transients with well-established spectroscopic SN types (primarily SN Ibn and II/IIb). We measure the Type Ia SN and core-collapse (CC) SN rates and luminosity functions, which show good consistency with recent work. About 7% of CC SNe explode in very low-luminosity galaxies (Mi > -16 mag), 10% in red-sequence galaxies, and 1% in massive ellipticals. We find no significant difference in the luminosity or color distributions between the host galaxies of SNe Type II and SNe Type Ib/c, suggesting that line-driven wind stripping does not play a major role in the loss of the hydrogen envelope from their progenitors. Future large-scale classification efforts with ZTF and other wide-area surveys will provide highquality measurements of the rates, properties, and environments of all known types of optical transients and limits on the existence of theoretically predicted but as yet unobserved explosions.