iPTF Survey for Cool Transients

Creators: Adams, S. M.; Blagorodnova, N.; Kasliwal, M. M.; Barlow, T.; Cook, D. O.; Ho, A. Y. Q.; Kulkarni, S. R.; Kupfer, T.; Neill, J. D.; Walters, R.; Laher, R. R.; Masci, F.

Abstract

We performed a wide-area (2000 deg^2) g and I band experiment as part of a two month extension to the Intermediate Palomar Transient Factory. We discovered 36 extragalactic transients including iPTF17lf, a highly reddened local SN Ia, iPTF17bkj, a new member of the rare class of transitional Ibn/IIn supernovae, and iPTF17be, a candidate luminous blue variable outburst. We do not detect any luminous red novae and place an upper limit on their rate. We show that adding a slow-cadence I band component to upcoming surveys such as the Zwicky Transient Facility will improve the photometric selection of cool and dusty transients.

Additional Information

© 2018 Astronomical Society of the Pacific. Received 2017 July 18. Accepted 2017 December 20. Published 2018 February 1. We thank Mislav Balokovic, Kevin Burdge, Kishalay De, George Djorgovski, Andrew Drake, Marianne Heida, Nikita Kamraj, and Harish Vedantham for taking observations used in this paper. We thank the anonymous referee and Chris Kochanek for helpful comments. A.A.M. is supported by a grant from the Large Synoptic Survey Telescope Corporation, which funds the Data Science Fellowship Program. J.S and F.T. gratefully acknowledge the support from the Knut and Alice Wallenberg Foundation. R.A., M.B., A.G., and R.F. acknowledge support from the Swedish Research Council and the Swedish Space Board. 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 of the University System of Taiwan, and the Kavli Institute for the Physics and Mathematics of the Universe. 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. Some of the data presented herein were obtained at the W.M. Keck Observatory, which is operated as a scientific partnership among the California Institute of Technology, the University of California and the National Aeronautics and Space Administration. The Observatory was made possible by the generous financial support of the W.M. Keck Foundation. These results made use of the Discovery Channel Telescope at Lowell Observatory. Lowell is a private, non-profit institution dedicated to astrophysical research and public appreciation of astronomy and operates the DCT in partnership with Boston University, the University of Maryland, the University of Toledo, Northern Arizona University and Yale University. The upgrade of the DeVeny optical spectrograph has been funded by a generous grant from John and Ginger Giovale. This work is partly based on observations made with the Nordic Optical Telescope, operated by the Nordic Optical Telescope Scientific Association at the Observatorio del Roque de los Muchachos, La Palma, Spain, of the Instituto de Astrofisica de Canarias. This work is partly based on observations made with DOLoRes@TNG.

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Published - Adams_2018_PASP_130_034202.pdf

Submitted - 1711.10501.pdf

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