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Carnegie Supernova Project-II: The Near-infrared Spectroscopy Program

Hsiao, E. Y. and Kasliwal, M. M. (2019) Carnegie Supernova Project-II: The Near-infrared Spectroscopy Program. Publications of the Astronomical Society of the Pacific, 131 (995). Art. No. 014002. ISSN 0004-6280.

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Shifting the focus of Type Ia supernova (SN Ia) cosmology to the near infrared (NIR) is a promising way to significantly reduce the systematic errors, as the strategy minimizes our reliance on the empirical width-luminosity relation and uncertain dust laws. Observations in the NIR are also crucial for our understanding of the origins and evolution of these events, further improving their cosmological utility. Any future experiments in the rest-frame NIR will require knowledge of the SN Ia NIR spectroscopic diversity, which is currently based on a small sample of observed spectra. Along with the accompanying paper, Phillips et al., we introduce the Carnegie Supernova Project-II (CSP-II), to follow-up nearby SNe Ia in both the optical and the NIR. In particular, this paper focuses on the CSP-II NIR spectroscopy program, describing the survey strategy, instrumental setups, data reduction, sample characteristics, and future analyses on the data set. In collaboration with the Harvard-Smithsonian Center for Astrophysics (CfA) Supernova Group, we obtained 661 NIR spectra of 157 SNe Ia. Within this sample, 451 NIR spectra of 90 SNe Ia have corresponding CSP-II follow-up light curves. Such a sample will allow detailed studies of the NIR spectroscopic properties of SNe Ia, providing a different perspective on the properties of the unburned material; the radioactive and stable nickel produced; progenitor magnetic fields; and searches for possible signatures of companion stars.

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URLURL TypeDescription Paper
Hsiao, E. Y.0000-0003-1039-2928
Kasliwal, M. M.0000-0002-5619-4938
Additional Information:© 2018 The Astronomical Society of the Pacific. Received 2018 September 19; accepted 2018 October 17; published 2018 November 27. This paper includes data gathered with the 6.5-m Magellan telescopes at Las Campanas Observatory, Chile. We are pleased to acknowledge the following individuals (in alphabetical order) for their assistance in obtaining the NIR spectroscopic data set: Y. Beletsky, G. Blanc, T. Dupuy, N. Elias-Rosa, R. Foley, L. W. Hsiao, B. Madore, A. Monson, E. Newton, D. Osip, P. Palunas, J. L. Prieto, M. Rouch, S. Schulze, and M. Turatto. We also thank the Las Campanas technical staff for their continued support over the years. The CSP-II has been supported by NSF grants AST-1008343, AST-1613426, AST-1613455, and AST-1613472, as well as the Danish Agency for Science and Technology and Innovation through a Sapere Aude Level 2 grant. M.S. acknowledges funding by a research grant (13261) from VILLUM FONDEN. Research by D.J.S. is supported by NSF grants AST-1821967, 1821987, 1813708, and 1813466. N.B.S. and K.K. acknowledge support from the The George P. and Cynthia Woods Mitchell Institute for Fundamental Physics and Astronomy. T.D. is supported by an appointment to the NASA Postdoctoral Program at the Goddard Space Flight Center, administered by Universities Space Research Association under contract with NASA. L.W. acknowledges the support by the Chinese Academy of Sciences (CAS), through a grant to the CAS South America Center for Astronomy (CASSACA) in Santiago, Chile. The bulk of the data presented here was obtained with the 1 m Swope, 2.5 m du Pont, and the 6.5 m Magellan Telescopes at the Las Campanas Observatory. Observations were also obtained at the Gemini Observatory (program IDs: GN-2011B-Q-68, GN-2012A-Q-59, GN-2012A-Q-69, GN-2013B-Q-76, GN-2014A-Q-52, GN-2014B-Q-13, GN-2014B-Q-70, GN-2015B-Q-7, and GS-2015B-Q-5), which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), the National Research Council (Canada), CONICYT (Chile), Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina), and Ministério da Ciência, Tecnologia e Inovação (Brazil). Also based on observations collected at the European Organisation for Astronomical Research in the Southern Hemisphere under ESO programme 088.D-0222. This research used resources of the National Energy Research Scientific Computing Center (NERSC), a U.S. Department of Energy Office of Science User Facility operated under contract No. DE-AC02-05CH11231. We have also made use of the NASA/IPAC Extragalactic Database (NED) which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. Facilities: Magellan Baade (FIRE) - , du Pont (WFCCD) Gemini North (GNIRS near-infrared spectrograph) - , Gemini South (FLAMINGOS-2) - , VLT (ISAAC) - , IRTF (SpeX) - , NOT (ALFOSC) - , La Silla-QUEST - , CRTS - , PTF - , iPTF - , OGLE - , ASAS-SN - , PS1 - , KISS - , ISSP - , MASTER - , SMT - . Software: firehose (Simcoe et al. 2013), GELATO (Harutyunyan et al. 2008), SNID (Blondin & Tonry 2007), Spextool (Cushing et al. 2004), superfit (Howell et al. 2005), SYNAPPS (Thomas et al. 2011), XDGNIRS, xtellcor (Vacca et al. 2003).
Group:Astronomy Department
Funding AgencyGrant Number
Danish Agency for Science and Technology and InnovationUNSPECIFIED
George P. and Cynthia Woods Mitchell Institute for Fundamental Physics and AstronomyUNSPECIFIED
NASA Postdoctoral ProgramUNSPECIFIED
Chinese Academy of SciencesUNSPECIFIED
Department of Energy (DOE)DE-AC02-05CH11231
Subject Keywords:(stars:) supernovae: general – (cosmology:) dark energy
Issue or Number:995
Record Number:CaltechAUTHORS:20181127-103612393
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Official Citation:E. Y. Hsiao et al 2019 PASP 131 014002
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:91219
Deposited By: Tony Diaz
Deposited On:27 Nov 2018 18:45
Last Modified:03 Oct 2019 20:32

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