R-band light-curve properties of Type Ia supernovae from the (intermediate) Palomar Transient Factory
Abstract
We present the best 265 sampled R-band light curves of spectroscopically identified Type Ia supernovae (SNe) from the Palomar Transient Factory (PTF; 2009-2012) survey and the intermediate Palomar Transient Factory (iPTF; 2013-2017). A model-independent light-curve template is built from our data-set with the purpose to investigate average properties and diversity in our sample. We searched for multiple populations in the light-curve properties using machine learning tools. We also utilized the long history of our light curves, up to 4000 days, to exclude any significant pre- or post- supernova flares. From the shapes of light curves we found the average rise time in the R band to be 16.8^(+0.5)_(−0.6) days. Although PTF/iPTF were single-band surveys, by modelling the residuals of the SNe in the Hubble–Lemaître diagram, we estimate the average colour excess of our sample to be 〈E(B − V)〉 ≈ 0.05(2) mag and thus the mean corrected peak brightness to be M_R = −19.02 ± 0.02 +5log(H_0[kms^(−1)Mpc^(−1)]/70) mag with only weak dependennce on light–curve shape. The intrinsic scatter is found to be σR = 0.186 ± 0.033 mag for the redshift range 0.05 < z < 0.1, without colour corrections of individual SNe. Our analysis shows that Malmquist bias becomes very significant at z = 0.13. A similar limitation is expected for the ongoing Zwicky Transient Facility (ZTF) survey using the same telescope, but new camera expressly designed for ZTF.
Additional Information
© 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model(https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model). Accepted 2018 November 30. Received 2018 November 29; in original form 2018 June 13. Published: 06 December 2018. SP would like to thank D. Menéndez Hurtado, K. Muroe, D. Mortlock, and T. Calvén for helpful discussions. The authors thank the anonymous referee for comments and suggestions which improved the paper. The Intermediate Palomar Transient Factory project is a scientific collaboration among the California Institute of Technology, Los Alamos National Laboratory, the University of Wisconsin, Milwaukee, the Oskar Klein Center, the Weizmann Institute of Science, the TANGO Program (Taiwan Next Generation OIR via UST-Caltech Collaboration) of the University System of Taiwan, and the Kavli Institute for the Physics and Mathematics of the Universe. The iPTF Swedish collaboration is funded through a grant from the Knut and Alice Wallenberg foundation and individual grants from the Swedish National Science Council as well as the Swedish National Space Agency. DAH is supported by NSF grant AST-1313484. This work was supported by the GROWTH project (Global Relay of Observatories Watching Transients Happen) funded by the National Science Foundation under Grant No 1545949. GROWTH is a collaborative project between California Institute of Technology (USA), Pomona College (USA), San Diego State University (USA), Los Alamos National Laboratory (USA), University of Maryland College Park (USA), University of Wisconsin Milwaukee (USA), Tokyo Institute of Technology (Japan), National Central University (Taiwan), Indian Institute of Astrophysics (India), Inter-University Center for Astronomy and Astrophysics (India), Weizmann Institute of Science (Israel), The Oskar Klein Centre at Stockholm University (Sweden), Humboldt University (Germany). The Weizmann interactive supernova data repository - http://wiserep.weizmann.ac.il was used to make the data public. This research was conducted using the resources of High Performance Computing Center North (HPC2N) under the proposal SNIC 2017/3-64. Part of this research was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration.Attached Files
Published - sty3301.pdf
Accepted Version - 1812.01439.pdf
Supplemental Material - sty3301_supplemental_figures.zip
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Additional details
- Eprint ID
- 94663
- Resolver ID
- CaltechAUTHORS:20190411-131634820
- Knut and Alice Wallenberg Foundation
- Swedish National Science Council
- Swedish National Space Board (SNSB)
- AST-1313484
- NSF
- AST-1545949
- NSF
- NASA/JPL/Caltech
- Created
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2019-04-11Created from EPrint's datestamp field
- Updated
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2021-11-16Created from EPrint's last_modified field
- Caltech groups
- Infrared Processing and Analysis Center (IPAC), Palomar Transient Factory, Astronomy Department