Spectra and Light Curves of Failed Supernovae (2009)
Fryer, Chris L., Brown, Peter J., Bufano, Filomena, Dahl, Jon A., Fontes, Christopher J., Frey, Lucille H., ...
Astronomers have proposed a number of mechanisms to produce supernova explosions. Although many of these mechanisms are now not considered primary engines behind supernovae, they do produce...
Rates and Delay Times of Type Ia Supernovae (2009)
Ruiter, Ashley J., Belczynski, Krzysztof, Fryer, Chris L.
We analyze the evolution of binary stars to calculate synthetic rates and delay times of the most promising Type Ia Supernovae progenitors. We present and discuss evolutionary scenarios in which a...
On The Maximum Mass of Stellar Black Holes (2009)
Belczynski, Krzysztof, Bulik, Tomasz, Fryer, Chris L., Ruiter, Ashley, Vink, Jorick S., Hurley, Jarrod R.
We present the spectrum of compact object masses: neutron stars and black holes that originate from single stars in different environments. In particular, we show the dependence of maximum black hole...
Martin, Kyle W., Liu, Siming, Fragile, Chris, Yu, Cong, Fryer, Chris L.
Sagittarius A* is a compact radio source at the Galactic center, powered by accretion of fully ionized plasmas into a supermassive black hole. However, the radio emission cannot be produced through...
On The Origin Of The Highest Redshift Gamma-Ray Burst GRB 080913 (2008)
Belczynski, Krzysztof, Hartmann, Dieter H., Fryer, Chris L., Holz, Daniel E., O'Shea, Brian
GRB 080913, discovered by SWIFT, is the most distant gamma-ray burst (GRB) known to-date, with a spectroscopically determined redshift of z=6.7. The detection of a burst at such an early epoch of the...
Gamma Ray Bursts and the Fermi Gamma Ray Space Telescope: Notes to the La Plata Lectures (2008)
Dermer, Charles D., Fryer, Chris L.
Gamma-ray bursts (GRBs) are a mixed class of sources consisting of, at least, the long duration and short-hard subclasses, the X-ray flashes, and the low-luminosity GRBs. In all cases, the release of...
ABSTRACT The Space Simulator: Modeling the Universe from Supernovae to Cosmology (2008)
Michael S. Warren, Chris L. Fryer, M. Patrick Goda
The Space Simulator is a 294-processor Beowulf cluster with theoretical peak performance just below 1.5 Teraflop/s. It is based on the Shuttle XPC SS51G mini chassis. Each node consists of a 2.53 GHz...
Short-Hard Gamma-Ray Bursts in Young Host Galaxies: the Effect of Prompt Twins (2007)
Belczynski, Krzysztof, Stanek, K. Z., Fryer, Chris L.
We investigate the effect of including a significant ``binary twin'' population (binaries with almost equal mass stars, q = M2/M1 > 0.95) for the production of double compact objects and some...
GRAVITATIONAL WAVE EMISSION FROM CORE COLLAPSE OF MASSIVE STARS (2007)
Chris L. Fryer, Daniel E. Holz, A. Hughes
We derive estimates for the characteristics of gravitational radiation from stellar collapse, using recent models of the core collapse of Chandrasekhar-massed white dwarfs (accretion-induced...
Gravitational Wave Emission From Core-Collapse of Massive Stars (2007)
Chris L. Fryer, Daniel E. Holz, Scott A. Hughes
We derive estimates for the characteristics of gravitational radiation from stellar collapse, using recent models of the core-collapse of Chandrasekhar mass white dwarfs (accretion induced collapse),...
Gravitational Waves Chris, Chris L. Fryer, Daniel E. Holz, Scott A. Hughes, Michael S. Warren
The new generation of gravitational wave (GW) detectors have the potential to open a novel window onto the violent dynamics of core collapse. Although it is certain that core collapse events generate...
Fryer, Chris L., Diehl, Steven
We review the current state of the art in double degenerate merger simulations to better understand the role this phenomenon plays in type Ia progenitors. Because the fate of a merged system may well...
Neutrinos from Fallback onto Newly Formed Neutron Stars (2007)
In the standard supernova picture, type Ib/c and type II supernovae are powered by the potential energy released in the collapse of the core of a massive star. In studying supernovae, we primarily...
Light Curve Calculations of Supernovae from Fallback Gamma-Ray Bursts (2007)
Fryer, Chris L., Hungerford, Aimee L., Young, Patrick A.
The currently-favored model for long-duration gamma-ray bursts (GRBs) invokes explosions from the collapse of a massive star down to a black hole: either directly or through fallback. Those GRBs...
The Birthplaces of Gamma-Ray Bursts (2007)
Young, Patrick A., Fryer, Chris L.
We use population synthesis to construct distributions of gamma-ray bursts (GRBs) for different proposed progenitor models. We use a description of star formation that takes into account the...
Constraints on type Ib/c supernovae and gamma-ray burst progenitors (2007)
Fryer, Chris L., Mazzali, Paolo A., Prochaska, Jason, Cappellaro, Enrico, Panaitescu, Alin, Berger, Edo, ...
Uncertainties in Supernova Yields I: 1D Explosions (2006)
Young, Patrick A., Fryer, Chris L.
Theoretical nucleosynthetic yields from supernovae are sensitive to both the details of the progenitor star and the explosion calculation. We attempt to comprehensively identify the sources of...
Supernova Fallback: A Possible Site for the r-Process (2006)
Fryer, Chris L., Herwig, Falk, Hungerford, Aimee, Timmes, Frank
The conditions for the leading r-process site candidate, neutrino-driven winds, can not be reproduced self-consistently in current supernova models. For that reason, we investigate an alternate model...
A New Look at the Binary Characteristics of Massive Stars (2006)
Kobulnicky, Henry A., Fryer, Chris L.
We constrain the properties of massive binaries by comparing radial velocity data of Cygnus OB2 with Monte Carlo models. Our comparisons test several popular prescriptions for massive binary...
The Environments around Long-Duration Gamma-Ray Burst Progenitors (2006)
Fryer, Chris L., Rockefeller, Gabriel, Young, Patrick A.
Gamma-ray burst (GRB) afterglow observations have allowed us to significantly constrain the engines producing these energetic explosions. Te redshift and position information provided by these...
Effects of neutrino-driven kicks on the supernova explosion mechanism (2005)
Fryer, Chris L., Kusenko, Alexander
We show that neutrino-driven pulsar kicks can increase the energy of the supernova shock. The observed large velocities of pulsars are believed to originate in the supernova explosion, either from...
Constraints on the Progenitor of Cassiopeia A (2005)
Young, Patrick A., Fryer, Chris L., Hungerford, Aimee, Arnett, David, Rockefeller, Gabriel, Timmes, F. X., ...
We compare a suite of 3D explosion calculations and stellar models incorporating advanced physics with observational constraints on the progenitor of Cassiopeia A. We consider binary and single stars...
The Impact of Hydrodynamic Mixing on Supernova Progenitors (2005)
Young, Patrick A., Meakin, Casey, Arnett, David, Fryer, Chris L.
Recent multidimensional hydrodynamic simulations have demonstrated the importance of hydrodynamic motions in the convective boundary and radiative regions of stars to transport of energy, momentum,...
The Neutrino Bubble Instability: A Mechanism for Generating Pulsar Kicks (2004)
Socrates, Aristotle, Blaes, Omer, Hungerford, Aimee, Fryer, Chris L.
An explanation for the large random velocities of pulsars is presented. Like many other models, we propose that the momentum imparted to the star is given at birth. The ultimate source of energy is...
Binary Merger Progenitors for Gamma-Ray Bursts and Hypernovae (2004)
Fryer, Chris L., Heger, Alexander
The collapsar model, the now leading model for the engine behind gamma-ray bursts and hypernovae, requires that a star collapses to form a black hole surrounded by an accretion disk of high-angular...
Diffuse X-rays from the Arches and Quintuplet clusters (2004)
Rockefeller, Gabriel, Fryer, Chris L., Melia, Fulvio, Wang, Q. Daniel
The origin and initial mass function of young stellar clusters near the Galactic center are still poorly understood. Two of the more prominent ones, the Arches and Quintuplet clusters, may have...
Gravitational Waves from Stellar Collapse: Correlations to Explosion Asymmetries (2004)
Fryer, Chris L., Holz, Daniel E., Hughes, Scott A.
The collapse of massive stars not only produces observable outbursts across the entire electromagnetic spectrum but, for Galactic (or near-Galactic) supernovae, detectable signals for ground-based...
Neutron Star Kicks from Asymmetric Collapse (2003)
Many neutron stars are observed to be moving with spatial velocities, in excess of 500km/s. A number of mechanisms have been proposed to give neutron stars these high velocities. One of the leading...
Diffuse X-Rays from the Inner 3 Parsecs of the Galaxy (2003)
Rockefeller, Gabriel, Fryer, Chris L., Melia, Fulvio, Warren, Michael S.
Recent observations with the Chandra X-ray Observatory have provided us with the capability to discriminate point sources, such as the supermassive black hole Sgr A*, from the diffuse emission within...
Neutrino-Driven Explosions in GRBs and Hypernovae (2003)
Fryer, Chris L., Meszaros, Peter
We study the physics behind the neutrino-driven mechanism for gamma-ray bursts and hypernovae, deriving the critical density at which these outbursts occur in the collapsar model. The agreement...
Gravitational Waves from Gravitational Collapse (2003)
Gravitational wave emission from stellar collapse has been studied for more than three decades. Current state-of-the-art numerical investigations of collapse include those that use progenitors with...
Stellar collapse and gravitational waves (2002)
Fryer, Chris L., Holz, Daniel E., Hughes, Scott A., Warren, Michael S.
The new generation of gravitational wave (GW) detectors have the potential to open a novel window onto the violent dynamics of core collapse. Although it is certain that core collapse events generate...
Lloyd-Ronning, Nicole M., Fryer, Chris L., Ramirez-Ruiz, Enrico
Using 220 Gamma-Ray Burst (GRB) redshifts and luminosities derived from the luminosity-variability relationship of Fenimore & Ramirez-Ruiz (2000), we show that there exists a significant correlation...
Gravitational Wave Emission From Core-Collapse of Massive Stars (2001)
Fryer, Chris L., Holz, Daniel E., Hughes, Scott A.
We derive estimates for the characteristics of gravitational radiation from stellar collapse, using recent models of the core-collapse of Chandrasekhar mass white dwarfs (accretion induced collapse),...
The Merger of a Helium Star and a Black Hole: Gamma-Ray Bursts (2000)
Zhang, Weiqun, Fryer, Chris L.
There is growing observational evidence that gamma-ray bursts (GRBs) are powered by black holes accreting rapidly through a disk. The supernova-like outburst that accompanies some gamma-ray bursts...
Theoretical Black Hole Mass Distributions (1999)
Fryer, Chris L., Kalogera, Vassiliki
We derive the theoretical distribution function of black hole masses by studying the formation processes of black holes. We use the results of recent 2D simulations of core-collapse to obtain the...
The Dynamics and Outcomes of Rapid Infall onto Neutron Stars (1995)
Fryer, Chris L., Benz, Willy, Herant, Marc
We present an extensive study of accretion onto neutron stars in which the velocity of the neutron star and structure of the surrounding medium is such that the Bondi-Hoyle accretion exceeds .001...