PI: Melissa L. Graham, U. of Washington, firstname.lastname@example.org
Address: Department of Astronomy, Box 351580, Seattle, WA, 98195-1580 USA
CoI: D. Andrew Howell, UC Santa Barbara
CoI: Sahana Kumar, Florida State U.
CoI: Griffin Hosseinzadeh, UC Santa Barbara
CoI: David Sand, U. of Arizona
CoI: Eric Hsiao, Florida State U.
CoI: Iair Arcavi, UC Santa Barbara
CoI: Curtis McCully, UC Santa Barbara
CoI: Janos Botyanszki, UC Berkeley
CoI: Dan Kasen, UC Berkeley
CoI: Craig Wheeler, U. of Texas, Austin
CoI: Saurabh Jha, Rutgers U.
CoI: Stefano Valenti, UC Davis
CoI: K. Azalee Bostroem, UC Davis
CoI: Maryam Modjaz, NYU
Title: A Deeper Physical Understanding of Thermonuclear Supernovae with Nebular-Phase Spectra
Abstract: We propose to obtain GMOS imaging and spectroscopy of four Type Ia supernovae (SNe Ia) at late phases, when the material has become optically thin (nebular) and the spectrum reveals the composition and geometry in all regions of the ejecta. These data provide unique constraints on the nature of SN Ia progenitor stars and explosion mechanisms, but are only possible with an 8m class telescope like Gemini. We have chosen our targets to be SNe Ia that are most likely to return high-quality GMOS data and that will have high scientific value: all are low-redshift SNe Ia in regions of minimal surface brightness that have a well-sampled time-series of early-time spectra and photometry from the Las Cumbres Observatory.
Program Type: Standard/Extragalactic
Run 1 (2018A): GEM-SQ/GMOSS -- 29.4hrs band 3 (GS-2018A-Q-315 )
National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360