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Title: ZTF Early Observations of Type Ia Supernovae. I. Properties of the 2018 Sample

Journal Article · · The Astrophysical Journal (Online)
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  1. California Inst. of Technology (CalTech), Pasadena, CA (United States). Cahill Center for Astrophysics
  2. Northwestern Univ., Evanston, IL (United States). Center for Interdisciplinary Exploration and Research in Astrophysics (CIERA); Adler Planetarium, Chicago, IL (United States)
  3. Stockholm Univ., Stockholm (Sweden). Oskar Klein Centre
  4. California Inst. of Technology (CalTech), Pasadena, CA (United States). Infrared Processing and Analysis Center (IPAC)
  5. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States)
  6. Radboud Univ., Nijmegen (The Netherlands)
  7. Univ. Clermont Auvergne, Clermont-Ferrand (France). Lab. de Physique de Clermont
  8. Humboldt-Univ. zu Berlin, Berlin (Germany). Inst. of Physics
  9. Univ. of Washington, Seattle, WA (United States). DIRAC Inst.
  10. NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States); Univ. of Maryland, College Park, MD (United States). Joint Space-Science Inst.
  11. Univ. of Maryland, College Park, MD (United States)
  12. California Inst. of Technology (CalTech), Pasadena, CA (United States)
  13. Univ. of Washington, Seattle, WA (United States)
  14. Univ. of California, Santa Cruz, CA (United States)
  15. Univ. of California, Santa Barbara, CA (United States). Kavli Inst. for Theoretical Physics
  16. Liverpool John Moores Univ., Liverpool (United States). Astrophysics Research Inst.
  17. Weizmann Inst. of Science, Rehovot (Israel). Benoziyo Center for Astrophysics
  18. California Inst. of Technology (CalTech), Pasadena, CA (United States). Cahill Center for Astrophysics, and Caltech Optical Observatories
+ Show Author Affiliations

Early-time observations of Type Ia supernovae (SNe Ia) are essential to constrain the properties of their progenitors. In this paper, we present high-quality light curves of 127 SNe Ia discovered by the Zwicky Transient Facility (ZTF) in 2018. We describe our method to perform forced point-spread function photometry, which can be applied to other types of extragalactic transients. With a planned cadence of six observations per night (three g + three r), all of the 127 SNe Ia are detected in both g and r bands more than 10 days (in the rest frame) prior to the epoch of g-band maximum light. The redshifts of these objects range from z = 0.0181 to 0.165; the median redshift is 0.074. Among the 127 SNe, 50 are detected at least 14 days prior to maximum light (in the rest frame), with a subset of nine objects being detected more than 17 days before g-band peak. This is the largest sample of young SNe Ia collected to date; it can be used to study the shape and color evolution of the rising light curves in unprecedented detail. We discuss six peculiar events in this sample: one 02cx-like event ZTF18abclfee (SN 2018crl), one Ia-CSM SN ZTF18aaykjei (SN 2018cxk), and four objects with possible super-Chandrasekhar mass progenitors: ZTF18abhpgje (SN 2018eul), ZTF18abdpvnd (SN 2018dvf), ZTF18aawpcel (SN 2018cir), and ZTF18abddmrf (SN 2018dsx).

Research Organization:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR)
Contributing Organization:
National Science Foundation (NSF); Swedish Research Council; European Research Council (ERC)
Grant/Contract Number:
AC02-05CH11231; 1545949; 759194-USNAC; DGE1144469; 1106171; AST-1440341
OSTI ID:
1574356
Journal Information:
The Astrophysical Journal (Online), Vol. 886, Issue 2; ISSN 1538-4357
Publisher:
Institute of Physics (IOP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 52 works
Citation information provided by
Web of Science

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Exploring the Potential Diversity of Early Type Ia Supernova Light Curves text January 2015
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The peculiar Type Ia supernova iPTF14atg: Chandrasekhar-mass explosion or violent merger? text January 2016
Volumetric Survey Speed: A Figure of Merit for Transient Surveys text January 2016
Progenitors of type Ia supernovae text January 2016
Markov Chain Monte Carlo Methods for Bayesian Data Analysis in Astronomy text January 2017
Early Blue Excess from the Type Ia Supernova 2017cbv and Implications for Its Progenitor text January 2017
Early Observations of the Type Ia Supernova iPTF 16abc: A Case of Interaction with Nearby, Unbound Material and/or Strong Ejecta Mixing text January 2017
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Type Ia Supernovae in the First Few Days: Signatures of Helium Detonation versus Interaction text January 2018
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ZTF 18aaqeasu (SN 2018byg): A Massive Helium-shell Double Detonation on a Sub-Chandrasekhar Mass White Dwarf text January 2019
The Zwicky Transient Facility: Data Processing, Products, and Archive text January 2019
The GROWTH Marshal: A Dynamic Science Portal for Time-Domain Astronomy text January 2019
The Zwicky Transient Facility Alert Distribution System text January 2019
A Fully Automated Integral Field Spectrograph Pipeline for the SEDMachine: pysedm text January 2019
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Nearby Supernova Factory Observations of SN 2005gj: Another Type Ia Supernova in a Massive Circumstellar Envelope text January 2006
The type Ia supernova SNLS-03D3bb from a super-Chandrasekhar-mass white dwarf star text January 2006

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