NOAO >   Observing Info >   Approved Programs >   2012A-0295

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Proposal Information for 2012A-0295


PI: Eric Y. Hsiao, Carnegie Institution of Washington, hsiao@lco.cl
Address: Carnegie Observatories, Las Campanas Observatory, Casilla 601, La Serena, Chile

CoI: Peter Hoeflich, Florida State University
CoI: Tiara Diamond, Florida State University
CoI: Christopher R. Burns, Carnegie Institution of Washington
CoI: Christopher L. Gerardy, Florida State University
CoI: Nidia Morrell, Carnegie Institution of Washington
CoI: Brendan Penney, Florida State University
CoI: Mark M. Phillips, Carnegie Institution of Washington
CoI: Christopher J. Pritchet, University of Victoria
CoI: Maximilian Stritzinger, Stockholm Observatory

Title: Late-time near-infrared spectroscopy of SN 2011fe

Abstract: While Type Ia supernovae (SNe Ia) are playing an instrumental role in deciphering the nature of dark energy, aspects of their progenitors and explosions still remain unknown. The proximity of SN 2011fe allows it to stay brighter than H=17 well beyond one year past explosion and provides a unique opportunity to make exquisitely detailed near-infrared (NIR) spectroscopic observations of a SN Ia at late epochs. We propose to observe the evolution of the 1.65 um [Fe II] line of SN 2011fe at four epochs between 150 and 300 days past B-band maximum. The emission profiles of the well-isolated NIR [Fe II] lines will trace out the global kinematic distribution of radioactive material in the expanding supernova ejecta. These pioneering observations will allow us to probe both the magnetic field in the progenitor star and the three-dimensional distribution of iron group elements in the expanding ejecta. The findings will have direct consequences for the use of SNe Ia in high precision cosmology.


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