Bulletin of the American Physical Society
APS New England Section 2018 Fall Meeting
Volume 63, Number 21
Friday–Saturday, November 2–3, 2018; University of Massachusetts Dartmouth, Dartmouth, Massachusetts
Session C01: Astrophysics I |
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Room: CCB Building 247 |
Saturday, November 3, 2018 9:00AM - 9:45AM |
C01.00001: Primordial black holes as dark matter Invited Speaker: Savvas Koushiappas I will discuss primordial black holes as a dark matter candidate in light of the recent LIGO detections. In addition I will present tests that can distinguish between the merger rate of stellar and primordial black holes. |
Saturday, November 3, 2018 9:45AM - 9:57AM |
C01.00002: Carbon Detonation Initiation in Highly Turbulent Electron-Degenerate Matter Gabriel Casabona, Robert T T Fisher, Pritom Mozumdar Type Ia supernovae play a crucial role as standardizable candles for cosmology, but their stellar progenitors remain mysterious. Underlying this mystery is a crucial physical process: the mechanism of detonation initiation in Type Ia supernovae. Using the FLASH4 code, simulations were run to explore detonation initiation under various initial conditions. Adaptive mesh refinement techniques were utilized in order to refine the limits of successful and unsuccessful detonations. Further research into this topic will clarify the mechanisms giving rise to Type Ia supernovae. |
Saturday, November 3, 2018 9:57AM - 10:09AM |
C01.00003: Constraining Type Ia Supernovae with Models and Observations of Late-Time Light Curves Vishal Tiwari, Robert T. T. Fisher, Or Graur Type Ia supernovae (SNe Ia) are thermonuclear explosions of carbon-oxygen white dwarfs, and play a crucial role as standardizable candles for cosmology. The exact nature of the stellar progenitors and mechanisms of explosions of SNe Ia is still unknown. SNe Ia light curves are powered by the decay of radioactive Ni56 chain which is created during the explosion. However, observations of SNe Ia at late times, past 900 days past maximum light, indicate a flattening of the light curve, which are believed to be powered by 57Co abundances. In this talk, I will compare these observations against computational nucleosynthetic yields of different types of models, and discuss the implications for the stellar progenitors of SNe Ia. |
Saturday, November 3, 2018 10:09AM - 10:21AM |
C01.00004: Constraining the Jet Properties of Gamma-Ray Bursts with Multimessenger Astronomy Andrea Sylvia Sylvia Biscoveanu, Eric Thrane, Salvatore Vitale The simultaneous detection of GW170817 and GRB170817A ushered in the era of multi messenger astronomy, confirming the hypothesis that binary neutron star mergers are the progenitors of at least some short gamma-ray bursts. GRB prompt emission is thought to be highly beamed, but determining the opening angle of the jet traditionally relies on the observation of a jet break in the afterglow since the inclination angle of the system is unknown. Coincident gravitational wave observations of short GRBs from binary neutron star mergers, however, provide an independent measurement of the inclination angle and distance to the source. We describe a Bayesian method for determining the morphology of short GRBs using coincident electromagnetic and gravitational-wave observations. In particular, we show that is possible to measure the gamma-ray burst opening angle, Lorentz factor, and total energy for a particular event, and that by studying a population of such coincident detections the distributions of these parameters can also be inferred. |
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