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The Theoretical Astrophysics Program is an interdisciplinary program designed to foster scientific and academic links among the Physics, Astronomy, and Planetary Sciences community.
Feb
10
Mon
2020
Nicole Lloyd-Ronning
Feb 10 @ 3:45 pm – 4:45 pm
Nicole Lloyd-Ronning

Nicole Lloyd-Ronning, Los Alamos National Laboratory

Title: Gamma-ray Bursts: Inside and Out.

Abstract: More than twenty years after the discovery of the first gamma-ray burst (GRB) afterglow and the definitive determination of their cosmological distances, there are still a number of unsolved, fundamental questions related to the central engines and progenitor systems that produce GRBs.  Although we have some constraints on necessary progenitor properties from GRB energetics, timescales, locations in their host galaxies, and other observables, there is still room for a vast zoo of single and binary star progenitors to explain these enigmatic events. In this talk, I will present recent results that offer constraints on gamma-ray burst progenitors, both in the context of their inner engine and their surrounding environments.  In addition, I will discuss how the GRB jet opening angle appears to evolve over cosmic time, with GRB jets at high redshift more narrowly beamed than those at low redshift. I will show how this result can not only be used to learn about the nature of the beast behind these most powerful explosions in the universe but also offer constraints on the high redshift star formation rate.

Refreshments served at 3:15pm in the 3rd Floor Atrium

Feb
24
Mon
2020
Antonija Oklopčić
Feb 24 @ 3:45 pm – 4:45 pm
Antonija Oklopčić

Antonija Oklopčić – Harvard University

Title and Abstract: TBA

Refreshments served at 3:15pm in the 3rd Floor Atrium

Mar
16
Mon
2020
Andreu Font-Ribera
Mar 16 @ 3:45 pm – 4:45 pm
Andreu Font-Ribera

Andrew Font-Ribera – University College London

Title and Abstract: TBA

Refreshments served at 3:15pm in the 3rd Floor Atrium

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LOCATION

Steward Observatory
933 N Cherry Ave, Tucson, AZ 85719