ZTF SN Ia DR2: Overview
Abstract
We present the first homogeneous release of several thousand Type Ia supernovae (SNe Ia), all having spectroscopic classification, and spectroscopic redshifts for half the sample. This release, named the "DR2", contains 3628 nearby (z < 0.3) SNe Ia discovered, followed and classified by the Zwicky Transient Facility survey between March 2018 and December 2020. Of these, 3000 have good-to-excellent sampling and 2667 pass standard cosmology light-curve quality cuts. This release is thus the largest SN Ia release to date, increasing by an order of magnitude the number of well characterized low-redshift objects. With the "DR2", we also provide a volume-limited (z < 0.06) sample of nearly a thousand SNe Ia. With such a large, homogeneous and well controlled dataset, we are studying key current questions on SN cosmology, such as the linearity SNe Ia standardization, the SN and host dependencies, the diversity of the SN Ia population, and the accuracy of the current light-curve modeling. These, and more, are studied in detail in a series of articles associated with this release. Alongside the SN Ia parameters, we publish our force-photometry gri-band light curves, 5138 spectra, local and global host properties, observing logs, and a python tool to ease use and access of these data. The photometric accuracy of the "DR2" is not yet suited for cosmological parameter inference, which will follow as "DR2.5" release. We nonetheless demonstrate that the multi-thousand SN Ia Hubble Diagram has a typical 0.15 mag scatter.
Keywords
Cite
@article{arxiv.2409.04346,
title = {ZTF SN Ia DR2: Overview},
author = {Mickael Rigault and Mathew Smith and Ariel Goobar and Kate Maguire and Georgios Dimitriadis and Umut Burgaz and Suhail Dhawan and Jesper Sollerman and Nicolas Regnault and Marek Kowalski and Melissa Amenouche and Marie Aubert and Chloé Barjou-Delayre and Julian Bautista and Josh S. Bloom and Bastien Carreres and Tracy X. Chen and Yannick Copin and Maxime Deckers and Dominique Fouchez and Christoffer Fremling and Lluis Galbany and Madeleine Ginolin and Matthew Graham and Mancy M. Kasliwal and W. D'Arcy Kenworthy and Young-Lo Kim and Dylan Kuhn and Frank F. Masci and Tomas Müller-Bravo and Adam Miller and Joel Johansson and Jakob Nordin and Peter Nugent and Igor Andreoni and Eric Bellm and Marc Betoule and Mahmoud Osman and Dan Perley and Brodie Popovic and Philippe Rosnet and Damiano Rosselli and Florian Ruppin and Robert Senzel and Ben Rusholme and Tassilo Schweyer and Jacco H. Terwel and Alice Townsend and Andy Tzanidakis and Avery Wold and Josiah Purdum and Yu-Jing Qin and Benjamin Racine and Simeon Reusch and Reed Riddle and Lin Yan},
journal= {arXiv preprint arXiv:2409.04346},
year = {2024}
}
Comments
ZTF SN Ia DR2 release paper. Accepted for publication (Astronomy and Astrophysics). Reference paper for the ZTF SN Ia DR2 A&A Special Issue