NOAO >   Observing Info >   Approved Programs >   2018A-0221

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Program Information for 2018A-0221


PI: David Sand, U. of Arizona, dsand@as.arizona.edu
Address: Department of Astronomy and Steward Observatory, 933 NORTH CHERRY AVENUE, TUCSON, AZ 85721-0065 USA

CoI: Eric Hsiao, Florida State U.
CoI: Stefano Valenti, UC Davis
CoI: Leonardo Tartaglia, U. of Arizona
CoI: D. Andrew Howell, Las Cumbres Observatory
CoI: Sam Wyatt, U. of Arizona
CoI: Tiara R. Diamond, NASA Goddard Space Flight Center
CoI: Iair Arcavi, Las Cumbres Observatory
CoI: Melissa L. Graham, U. of Washington
CoI: Howie Marion, U. of Texas, Austin
CoI: Curtis McCully, Las Cumbres Observatory
CoI: Griffin Hosseinzadeh, Las Cumbres Observatory
CoI: Nicholas B Suntzeff, Texas A&M U.
CoI: Craig Wheeler, U. of Texas, Austin
CoI: Saurabh Jha, Rutgers U.
CoI: Maryam Modjaz, NYU
CoI: Daichi Hiramatsu, Las Cumbres Observatory
CoI: Peter Hoflich, Florida State U.
CoI: Jozsef Vinko, University of Szeged
CoI: Dae-Kim Moon, University of Toronto

Title: Constraining Type Ia Supernova Physics with Near-Infrared Spectroscopy

Abstract: Despite their success as standardizable candles, relatively little is know about the exact progenitor(s) and explosion physics of type Ia supernovae -- a potential source of systematic uncertainty for future dark energy surveys, and a hole in our knowledge about stellar end-states. One promising route forward is the combination of dense optical time series and near-infrared (NIR) spectroscopic data sets. Recent work has suggested that the NIR can discern unburned carbon from the progenitor white dwarf more cleanly than in the optical, and the PaBeta line roughly one month after maximum light can reveal the presence of a nondegenerate companion star. Both measures provide a direct constraint for SN Ia explosion models and their progenitor origins, but only a handful of appropriate NIR spectroscopic times series exist. We propose to continue our campaign to observe a sample of five SN Ia with such data (leveraging our access to a worldwide network of 1m imaging telescopes and twin robotic optical spectrographs) in order to begin to tackle our understanding of NIR spectral diagnostics and how they vary from supernova to supernova.

Program Type: Standard/Extragalactic

Scheduled Nights:
Run 1 (2018A):  GEM-NQ/GNIRS -- 15.97hrs band 1 (GS-2018A-Q-107 )


National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360



NOAO >   Observing Info >   Approved Programs >   2018A-0221

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