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Date
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Speaker
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Title
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Sep 1
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Labor Day: University Closed. No talk scheduled.
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Sep 8
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Milos Milosavljevic
University of Texas at Austin
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Organizational meeting.
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Sep 15
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No talk scheduled.
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Sep 22
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Alan Sluder
University of Texas at Austin
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"Following the Three Dimensional Trajectories of Individual 'Atoms' in Population III Supernova Ejecta and the Implications for Element Abundances of Population II Stars"
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Sep 29
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No talk scheduled.
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Oct 6
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Brian Mulligan
University of Texas at Austin
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"High Velocity Features in Type Ia Supernovae: Circumstellar Shell Interaction"
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Oct 13
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John Scalo
University of Texas at Austin
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"Signatures of Episodic Rejuvenation of Supersonic Turbulence in the ISM"
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Oct 20
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Manos Chatzopoulos
University of Chicago
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"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
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Oct 27
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Hyunbae Park
University of Texas at Austin
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"The Impact of Cosmic Reionization on Small-Scale Structures"
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Oct 27
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Patrick Crumley
University of Texas at Austin
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"Super-Eddington Tidal Disruption Events:
An Ideal Place to Probe Relativistic Jet Compositions and Emission Mechanisms"
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Nov 3
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Aaron Smith
University of Texas at Austin
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"Lyman-alpha Escape and Radiation Pressure in the First Galaxies"
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Nov 10
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Benny Tsang
University of Texas at Austin
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"Radiation Pressure-driven Winds in Star-forming Environments"
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Nov 17
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Jacob Hummel
University of Texas at Austin
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"The First Stars: Formation under Radiative Feedback"
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Nov 17
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Rodolfo Santana
University of Texas at Austin
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"Constraining the GRB X-ray Flare Radiative Mechanism with Optical Observations"
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Nov 24
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Bohua Li
University of Texas at Austin
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"Complex Scalar Field Dark Matter and Cosmological B-Modes from Inflation"
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Dec 1
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No talk scheduled.
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