Date

Speaker

Title

Sep 1

Labor Day: University Closed. No talk scheduled.

Sep 8

Milos Milosavljevic

University of Texas at Austin

Organizational meeting.

Sep 15

No talk scheduled.

Sep 22

Alan Sluder

University of Texas at Austin

"Following the Three Dimensional Trajectories of Individual 'Atoms' in Population III Supernova Ejecta and the Implications for Element Abundances of Population II Stars"

Sep 29

No talk scheduled.

Oct 6

Brian Mulligan

University of Texas at Austin

"High Velocity Features in Type Ia Supernovae: Circumstellar Shell Interaction"

Oct 13

John Scalo

University of Texas at Austin

"Signatures of Episodic Rejuvenation of Supersonic Turbulence in the ISM"

Oct 20

Manos Chatzopoulos

University of Chicago

"Emission from Pair Instability Supernovae with Rotation"

Pair Instability Supernovae have been suggested as candidates for some Super Luminous Supernovae, like SN 2007bi, and as one of the dominant types of explosion occurring in the early Universe from massive, zero-metallicity Population III stars. The progenitors of such events can be rapidly rotating therefore exhibiting different evolutionary properties due to the effects of rotationally-induced mixing and mass-loss. Proper identification of such events requires rigorous radiation hydrodynamics and radiative transfer calculations that capture not only the behavior of the light curve but also the spectral evolution of these events. We present radiation hydrodynamics and local thermal equillibrium radiation transport calculations for 90-300 Msun rotating pair-instability supernovae covering both the shock break-out and late light curve phases. We also investigate cases of different ZAMS metallicity and rotation rate to determine the impact of these parameters to the detailed spectral characteristics of these events. We find that for a variety of progenitor masses, rotating pair instability supernovae are red in color in contrast with the observations of super-luminous supernovae and neither seem to match any other observed events also in terms of spectroscopic properties. Our models are in good agreement with models of non-rotating PISN discussed in the literature despite the different radiative transfer codes used. We also find that the ZAMS metallicity and rotation properties of the progenitor are erased after the explosion and cannot be identified in the resulting model spectra. We determine that the combined effects of pre-SN mass-loss and SN ejecta temperature and velocity have the most direct impact in spectra of PISNe.

close

Oct 27

Hyunbae Park

University of Texas at Austin

"The Impact of Cosmic Reionization on Small-Scale Structures"

Oct 27

Patrick Crumley

University of Texas at Austin

"Super-Eddington Tidal Disruption Events: An Ideal Place to Probe Relativistic Jet Compositions and Emission Mechanisms"

Nov 3

Aaron Smith

University of Texas at Austin

"Lyman-alpha Escape and Radiation Pressure in the First Galaxies"

Nov 10

Benny Tsang

University of Texas at Austin

"Radiation Pressure-driven Winds in Star-forming Environments"

Nov 17

Jacob Hummel

University of Texas at Austin

"The First Stars: Formation under Radiative Feedback"

Nov 17

Rodolfo Santana

University of Texas at Austin

"Constraining the GRB X-ray Flare Radiative Mechanism with Optical Observations"

Nov 24

Bohua Li

University of Texas at Austin

"Complex Scalar Field Dark Matter and Cosmological B-Modes from Inflation"

Dec 1

No talk scheduled.