NOAO >   Observing Info >   Approved Programs >   2015A-0065

Small NOAO Logo

Program Information for 2015A-0065


PI: Dina Drozdov, Clemson U., ddrozdo@g.clemson.edu
Address: Physics Department, 118 Kinard Laboratory, Clemson, SC 29634 USA

CoI: Mark Leising, Clemson U.
CoI: Peter A Milne, U. of Arizona
CoI: Diana Yoder, Clemson U.

Title: SNe Ia Light Echo Evolution

Abstract: Type Ia supernovae (SNe Ia) are widely studied for their uniform properties, which make them ideal candidates for cosmological surveys. Although these exploding stars are popular astronomical targets, key fundamental questions about their nature remain, and new techniques need to be developed to investigate the progenitor system and explosion mechanism(s). Light echoes are created by light scattering off dust. The light echo follows a less-direct path than the initial explosion emission and is thus, delayed in reaching the observer. Light echoes from Type Ia supernovae are rare, with only 6 cases being discovered in the past decades. Two of those light echoes were discovered due to late- epoch monitoring of SNe~Ia performed as part of this program, and we aim to detect more with our focused searched. Light echoes impact the interpretation of late light curves. Because light echoes are ten magnitudes fainter than maximum light, the SN must be very bright at peak to yield a detectable light echo. One-two SNe~Ia are bright enough to be prime candidates for light echo searches each year. Light echo searches probe the SN surroundings, whether a light echo is detected or not. The colors of light echoes provide information as to the properties of the dust that scatters the light. Since the nature of host galaxy dust is a topic of considerable debate for SN Ia cosmology, light echoes as a probe of that dust could be a powerful tool for the treatment of extinction. If the scattering dust is in any way related to the binary system that produced the SN, then the light echo colors probe the underlying explosion mechanism.

Program Type: Standard/Galactic

Scheduled Nights:
Run 1 (2015A):  KP-4m/MOSA -- 3n on May 08 - May 10 2015


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 >   2015A-0065

noaoprop-help@noao.edu

Small NOAO Logo