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The Zwicky Transient Facility Type Ia supernova survey: first data release and results

Dhawan, S. and Goobar, A. and Smith, M. and Johansson, J. and Rigault, M. and Nordin, J. and Biswas, R. and Goldstein, D. and Nugent, P. and Kim, Y.-L. and Miller, A. A. and Graham, M. J. and Medford, M. and Kasliwal, M. M. and Kulkarni, S. R. and Duev, Dmitry A. and Bellm, E. and Rosnet, P. and Riddle, R. and Sollerman, J. (2022) The Zwicky Transient Facility Type Ia supernova survey: first data release and results. Monthly Notices of the Royal Astronomical Society, 510 (2). pp. 2228-2241. ISSN 0035-8711. doi:10.1093/mnras/stab3093.

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Type Ia supernovae (SNe Ia) in the nearby Hubble flow are excellent distance indicators in cosmology. The Zwicky Transient Facility (ZTF) has observed a large sample of SNe from an untargeted, rolling survey, reaching 20.8, 20.6, and 20.3 mag in g r, and i band, respectively. With an FoV of 47 deg², ZTF discovered > 3000 SNe Ia in a little over 2.5 yr. Here, we report on the sample of 761 spectroscopically classified SNe Ia from the first year of operations (DR1). The sample has a median redshift z¯= 0.057, nearly a factor of 2 higher than the current low-z sample. Our sample has a total of 934 spectra, of which 632 were obtained with the robotic SEDm on Palomar P60. We assess the potential for precision cosmology for a total of 305 SNe with redshifts from host galaxy spectra. The sample is already comparable in size to the entire combined literature low-z anchor sample. The median first detection is 13.5 d before maximum light, about 10 d earlier than the median in the literature. Furthermore, six SNe from our sample are at D_L < 80 Mpc, for which host galaxy distances can be obtained in the JAMES WEBB SPACE TELESCOPE era, such that we have calibrator and Hubble flow SNe observed with the same instrument. In the entire duration of ZTF-I, we have observed nearly 50 SNe for which we can obtain calibrator distances, key for per cent level distance scale measurements.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper ItemData
Dhawan, S.0000-0002-2376-6979
Goobar, A.0000-0002-4163-4996
Smith, M.0000-0002-3321-1432
Johansson, J.0000-0001-5975-290X
Rigault, M.0000-0002-8121-2560
Nordin, J.0000-0001-8342-6274
Biswas, R.0000-0002-5741-7195
Goldstein, D.0000-0003-3461-8661
Nugent, P.0000-0002-3389-0586
Kim, Y.-L.0000-0002-1031-0796
Miller, A. A.0000-0001-9515-478X
Graham, M. J.0000-0002-3168-0139
Medford, M.0000-0002-7226-0659
Kasliwal, M. M.0000-0002-5619-4938
Kulkarni, S. R.0000-0001-5390-8563
Duev, Dmitry A.0000-0001-5060-8733
Bellm, E.0000-0001-8018-5348
Rosnet, P.0000-0002-6099-7565
Riddle, R.0000-0002-0387-370X
Sollerman, J.0000-0003-1546-6615
Additional Information:© 2021 The Author(s). Published by Oxford University Press on behalf of Royal Astronomical Society. This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model ( Accepted 2021 October 12. Received 2021 October 1; in original form 2021 May 28. Published: 11 November 2021. SD is supported by the Isaac Newton Trust and the Kavli Foundation through the Newton-Kavli fellowship and acknowledges a research fellowship at Lucy Cavendish College. AG acknowledges support from the Swedish Research Council under Dnr VR 2016-03274 and 2020-03444. MS, MR, and Y-LK have received funding from the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation program (grant agreement No. 759194 – USNAC). This paper is based on observations obtained with the Samuel Oschin Telescope 48-inch and the 60-inch Telescope at the Palomar Observatory as part of the Zwicky Transient Facility project. ZTF is supported by the National Science Foundation under Grant No. AST-1440341 and a collaboration including Caltech, IPAC, the Weizmann Institute for Science, the Oskar Klein Center at Stockholm University, the University of Maryland, the University of Washington, Deutsches Elektronen-Synchrotron and Humboldt University, Los Alamos National Laboratories, the TANGO Consortium of Taiwan, the University of Wisconsin at Milwaukee, and Lawrence Berkeley National Laboratories. Operations are conducted by COO, IPAC, and UW. SED Machine is based upon work supported by the National Science Foundation under Grant No. 1106171. The ZTF forced-photometry service was funded under the Heising-Simons Foundation grant. This work was supported by the GROWTH project funded by the National Science Foundation under Grant No. 1545949. Software: NUMPY (van der Walt, Colbert & Varoquaux 2011), ASTROPY (Astropy Collaboration et al. 2013, 2018), SNCOSMO (Barbary et al. 2016), PHOTUTILS (Bradley et al. 2019), ZTFQUERY (Rigault 2018), SWARP (Bertin 2010), HOTPANTS (Becker 2015), ZUDS, FRINGEZ (Medford et al. 2021), MATPLOTLIB (Hunter 2007), IPAC forced Photometry Service, SPEXTRACTOR (Papadogiannakis 2019). Data Availability: The data used in this study are made available on github at
Group:Astronomy Department, Infrared Processing and Analysis Center (IPAC), Zwicky Transient Facility
Funding AgencyGrant Number
Isaac Newton TrustUNSPECIFIED
Kavli FoundationUNSPECIFIED
Lucy Cavendish CollegeUNSPECIFIED
Swedish Research Council2016-03274
Swedish Research Council2020-03444
European Research Council (ERC)759194
ZTF partner institutionsUNSPECIFIED
Heising-Simons FoundationUNSPECIFIED
Subject Keywords:surveys – supernovae: general – distance scale
Issue or Number:2
Record Number:CaltechAUTHORS:20211215-621576000
Persistent URL:
Official Citation:S Dhawan, A Goobar, M Smith, J Johansson, M Rigault, J Nordin, R Biswas, D Goldstein, P Nugent, Y-L Kim, A A Miller, M J Graham, M Medford, M M Kasliwal, S R Kulkarni, Dmitry A Duev, E Bellm, P Rosnet, R Riddle, J Sollerman, The Zwicky Transient Facility Type Ia supernova survey: first data release and results, Monthly Notices of the Royal Astronomical Society, Volume 510, Issue 2, February 2022, Pages 2228–2241,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:112472
Deposited By: George Porter
Deposited On:16 Dec 2021 00:00
Last Modified:11 Jan 2022 17:06

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