Zobrazeno 1 - 10
of 226
pro vyhledávání: '"Chan, Conrad"'
Fallback in core-collapse supernovae plays a crucial role in determining the properties of the compact remnants and of the ejecta composition. We perform three-dimensional simulations of mixing and fallback for selected non-rotating supernova models
Externí odkaz:
http://arxiv.org/abs/2003.04320
Autor:
Chan, Conrad, Mueller, Bernhard
We introduce a new discrete-ordinate scheme for solving the general relativistic Boltzmann transport equation in the context of core-collapse supernovae. Our algorithm avoids the need to spell out the complicated advection terms in energy and angle t
Externí odkaz:
http://arxiv.org/abs/2003.02845
Publikováno v:
The Astrophysical Journal, Volume 880, Issue 1, article id. 21, 7 pp. (2019)
We present synthetic light curves of fallback-powered supernovae based on a neutrino-driven explosion of a 40 Msun zero-metallicity star with significant fallback accretion onto a black hole that was previously simulated by Chan et al. (2018) until s
Externí odkaz:
http://arxiv.org/abs/1906.00153
Autor:
Müller, Bernhard, Chan, Conrad
The solution of the Poisson equation is a ubiquitous problem in computational astrophysics. Most notably, the treatment of self-gravitating flows involves the Poisson equation for the gravitational field. In hydrodynamics codes using spherical polar
Externí odkaz:
http://arxiv.org/abs/1806.06623
Fallback in core-collapse supernovae is considered a major ingredient for explaining abundance anomalies in metal-poor stars and the natal kicks and spins of black holes (BHs). We present a first 3D simulation of BH formation and fallback in an "abor
Externí odkaz:
http://arxiv.org/abs/1710.00838
Autor:
Price, Daniel J., Wurster, James, Tricco, Terrence S., Nixon, Chris, Toupin, Stéven, Pettitt, Alex, Chan, Conrad, Mentiplay, Daniel, Laibe, Guillaume, Glover, Simon, Dobbs, Clare, Nealon, Rebecca, Liptai, David, Worpel, Hauke, Bonnerot, Clément, Dipierro, Giovanni, Ballabio, Giulia, Ragusa, Enrico, Federrath, Christoph, Iaconi, Roberto, Reichardt, Thomas, Forgan, Duncan, Hutchison, Mark, Constantino, Thomas, Ayliffe, Ben, Hirsh, Kieran, Lodato, Giuseppe
We present Phantom, a fast, parallel, modular and low-memory smoothed particle hydrodynamics and magnetohydrodynamics code developed over the last decade for astrophysical applications in three dimensions. The code has been developed with a focus on
Externí odkaz:
http://arxiv.org/abs/1702.03930
Autor:
Chan, Conrad, Heger, Alexander
Modern numerical simulations of the formation of the first stars predict that the first stars formed in multiples. In those cases, the chemical yields of multiple supernova explosions may have contributed to the formation of a next generation star. W
Externí odkaz:
http://arxiv.org/abs/1610.06339
Autor:
Placco, Vinicius M., Frebel, Anna, Beers, Timothy C., Yoon, Jinmi, Chiti, Anirudh, Heger, Alexander, Chan, Conrad, Casey, Andrew R., Christlieb, Norbert
We report on the first high-resolution spectroscopic analysis of HE0020-1741, a bright (V=12.9), ultra metal-poor ([Fe/H] = -4.1), carbon-enhanced ([C/Fe] = +1.7) star selected from the Hamburg/ESO Survey. This star exhibits low abundances of neutron
Externí odkaz:
http://arxiv.org/abs/1609.02134
Autor:
Placco, Vinicius M., Frebel, Anna, Lee, Young Sun, Jacobson, Heather R., Beers, Timothy C., Pena, Jose M., Chan, Conrad, Heger, Alexander
We report the discovery of one extremely metal-poor (EMP; [Fe/H]<-3) and one ultra metal-poor (UMP; [Fe/H]<-4) star selected from the SDSS/SEGUE survey. These stars were identified as EMP candidates based on their medium-resolution (R~2,000) spectra,
Externí odkaz:
http://arxiv.org/abs/1507.03656
Nucleosynthesis in a Primordial Supernova: Carbon and Oxygen Abundances in SMSS J031300.36-670839.31
Autor:
Bessell, Michael, Collett, Remo, Keller, Stefan, Frebel, Anna, Heger, Alexander, Casey, Andrew, Masseron, Thomas, Asplund, Martin, Jacobson, Heather, Lind, Karin, Marino, Anna, Norris, John, Yong, David, Da Costa, Gary, Chan, Conrad, Magic, Zazralt, Schmidt, Brian, Tisserand, Patrick
SMSS J031300.36-670839.3 (hereafter SM0313-6708) is a sub-giant halo star, with no detectable Fe lines and large overabundances of C and Mg relative to Ca. We obtained VLT-UVES spectra extending to 3060 Angstroms showing strong OH A-X band lines enab
Externí odkaz:
http://arxiv.org/abs/1505.03756