Oak Ridge National Laboratory

Physics Division

Physics Division Seminars

Physics Division Seminars bring us speakers on a variety of physics related subjects. Usually these are held in the Building 6008 large Conference Room, at 3:00 pm on the chosen day, but times and locations may vary. For more information, contact our seminar chairman,

Alfredo Galindo-Uribarri
Tel (Office): (865) 574-6124  (FAX): (865) 574-1268


Thu., May 19, 2016, at 3:00 PM - 4:00 PM (refreshments served at 2:40 PM)

Cosmic Chandlery with Thermonuclear Supernovae

Alan C. Calder, State University of New York, Stony Brook, NY 11794
ORNL, Physics Division, Bldg. 6008 Large Conference Room

Thermonuclear (Type Ia) supernovae are bright stellar explosions distinguished by light curves that can be calibrated to allow for their use as "standard candles" for measuring cosmological distances. Contemporary research investigates how properties of the progenitor system that follow from properties of the host galaxy such as composition and age influence the brightness of an event. The goals are to better understand systematic effects and to assess the intrinsic scatter in the brightness, thereby reducing uncertainties in cosmological studies. I will present the results from ensembles of simulations in the single-degenerate paradigm addressing the influence of age and metallicity on the brightness of an event and compare our results to observed variations of brightness that correlate with properties of the host galaxy. I will also present results from "hybrid"progenitor models that incorporate recent advances in stellar evolution.

Contact: Alfredo Galindo-Uribarri, (865) 574-6124