The ZTF-BTS Type Ia supernovae luminosity function is consistent with a single progenitor channel for the explosions

Abstract

We construct the Type Ia supernovae (SNe Ia) luminosity function (LF) using the Zwicky Transient Facility Bright Transient Survey (BTS) catalogue. While this magnitude-limited survey has an unprecedented number of objects, it suffers from large distance uncertainties and lacks an estimation of host extinction. We bypass these issues by calculating the intrinsic luminosities from the shape parameters of the light curve's $g$ and $r$ bands, with the luminosities calibrated from the well observed SNe Ia sample of the Carnegie Supernova Project, allowing us to construct, for the first time, the intrinsic LF of SNe Ia. We then use a novel tight relation between the color stretch and the synthesized ${}^{56}$Ni mass, $M_{Ni56}$, to determine the $M_{Ni56}$ distribution of SNe Ia. We find that the LFs are unimodal, with their peaks in line with previous results, but have a much lower rate of dim events and luminous events. We show that the features on top of the unimodal LF-derived distributions are all compatible with statistical noise, consistent with a single progenitor channel for the explosions. We further derive, for the first time, the SNe Ia distribution of host galaxy extinction, and find a mean selective extinction of $E(B-V)\approx 0.1$ and a non-negligible fraction with large, $>1\text{mag}$, extinction in the optical bands. The high extinction is typical for luminous SNe, supporting their young population origin.

24 pages, 20 figures. Accepted for publication in MNRAS

References in corpus (13)

• The Zwicky Transient Facility: System Overview, Performance, and First Results
• The All-Sky Automated Survey for Supernovae (ASAS-SN) Light Curve Server v1.0
• CfA3: 185 Type Ia Supernova Light Curves from the CfA
• The Carnegie Supernova Project: Intrinsic Colors of Type Ia Supernovae
• The Carnegie Supernova Project I: Third Photometry Data Release of Low-Redshift Type Ia Supernovae and Other White Dwarf Explosions
• Optical and Near-Infrared Observations of the Highly Reddened, Rapidly Expanding Type Ia Supernova 2006X in M100
• Revisiting the Lick Observatory Supernova Search Volume-Limited Sample: Updated Classifications and Revised Stripped-Envelope Supernova Fractions
• Anomalous extinction behaviour towards the Type Ia SN 2003cg
• LOSS Revisited - II: The relative rates of different types of supernovae vary between low- and high-mass galaxies
• LOSS Revisited - I: Unraveling correlations between supernova rates and galaxy properties, as measured in a reanalysis of the Lick Observatory Supernova Search
• The volumetric rate of normal type Ia supernovae in the local universe discovered by the Palomar Transient Factory
• Supernovae and their host galaxies -- VII. The diversity of Type Ia supernova progenitors
• The Evolution of the Type Ia Supernova Luminosity Function

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