Dessart, Luc, Livne, Eli, Waldman, Roni
Observations of transient phenomena in the Universe reveal a spectrum of mass-ejection properties associated with massive stars, covering from Type II/Ib/Ic core-collapse supernovae (SNe) to giant...
SN 1994W: an interacting supernova or two interacting shells? (2009)
Dessart, Luc, Hillier, D. John, Gezari, Suvi, Basa, Stéphane, Matheson, Tom
We present a multi-epoch quantitative spectroscopic analysis of the Type IIn supernova (Type IIn SN) 1994W, an event interpreted by Chugai et al. as stemming from the interaction between the ejecta...
Type II Supernovae as Probes of Cosmology (2009)
Poznanski, Dovi, Baron, Eddie, Blondin, Stephane, Bloom, Joshua S., D'Andrea, Christopher B., Della Valle, Massimo, ...
- Constraining the cosmological parameters and understanding Dark Energy have tremendous implications for the nature of the Universe and its physical laws. - The pervasive limit of systematic...
Ott, Christian D., Burrows, Adam, Dessart, Luc, Livne, Eli
We perform axisymmetric (2D) multiangle, multigroup neutrino radiation-hydrodynamic calculations of the postbounce phase of core-collapse supernovae using a genuinely 2D discrete-ordinate (S_n)...
Probing Shock Breakout with Serendipitous GALEX Detections of Two SNLS Type II-P Supernovae (2008)
Gezari, Suvi, Dessart, Luc, Basa, Stéphane, Martin, D. Christopher, Neill, James D., Woosley, S. E., ...
We report the serendipitous detection by GALEX of fast (
Wolf-Rayet stars probed by AMBER/VLTI (2008)
Millour, Florentin, Chesneau, Olivier, Driebe, Thomas, Petrov, Romain, Bonneau, Daniel, Dessart, Luc, ...
Massive stars deeply influence their surroundings by their luminosity and the injection of kinetic energy. So far, they have mostly been studied with spatially unresolved observations, although...
Neutrino signatures and the neutrino-driven wind in Binary Neutron Star Mergers (2008)
Dessart, Luc, Ott, Christian, Burrows, Adam, Rosswog, Stefan, Livne, Eli
We present VULCAN/2D multi-group flux-limited-diffusion radiation hydrodynamics simulations of binary neutron star (BNS) mergers, using the Shen equation of state, covering ~100 ms, and starting from...
Townsend, Rich, Cohen, David H, Dessart, Luc, Hubrig, Swetlana, Naze, Yaël, Petit, Véronique, ...
Magnetic fields are unexpected in massive stars, due to the absence of a sub-surface convective dynamo. However, advances in instrumentation over the past three decades have led to their detection in...
Probing Shock Breakout with Serendipitous GALEX Detections of Two SNLS Type II-P Supernovae (2008)
Gezari, Suvi, Dessart, Luc, Basa, Stephane, Martin, D. Chris, Neill, James D., Woosley, S. E., ...
We report the serendipitous detection by GALEX of fast (1 mag) UV emission from two Type II plateau (II-P) supernovae (SNe) at z=0.185 and 0.324 discovered by the Supernova Legacy Survey. Optical...
SN 1994W: An Interacting Supernova or Two Interacting Shells? (2008)
Dessart, Luc, Hillier, D. John, Gezari, Suvi, Basa, Stephane, Matheson, Tom
We present a multi-epoch quantitative spectroscopic analysis of the Type IIn SN 1994W, an event interpreted by Chugai et al. as stemming from the interaction between the ejecta of a SN and a 0.4Msun...
Ott, Christian D., Burrows, Adam, Dessart, Luc, Livne, Eli
We perform axisymmetric (2D) multi-angle, multi-group neutrino radiation-hydrodynamic calculations of the postbounce phase of core-collapse supernovae using a genuinely 2D discrete-ordinate (S_n)...
Wolf-Rayet stars probed by AMBER/VLTI (2008)
Millour, Florentin, Chesneau, Olivier, Driebe, Thomas, Petrov, Romain, Bonneau, Daniel, Dessart, Luc, ...
Massive stars deeply influence their surroundings by their luminosity and the injection of kinetic energy. So far, they have mostly been studied with spatially unresolved observations, although...
Wolf-Rayet stars probed by AMBER/VLTI (2008)
Millour, Florentin, Chesneau, Olivier, Driebe, Thomas, Petrov, Romain, Bonneau, Daniel, Dessart, Luc, ...
Massive stars deeply influence their surroundings by their luminosity and the injection of kinetic energy. So far, they have mostly been studied with spatially unresolved observations, although...
The Neon Abundance in WC stars II. ISO/SWS Spectroscopy of HD 156385 (WR90) (2007)
Luc Dessart, Allan J. Willis, Paul A. Crowther, D. John Hillier
In general, observationally derived wind compositions of WR stars are in reasonable agreement with predictions from stellar evolution models for massive stars. However, Barlow et al. (1988)...
Stellar properties of Galactic Centre He i sources (2007)
Luc Dessart, Paul A. Crowther, Linda J. Smith, Bruce Bohannan
The Galactic Centre (GC) region has recently attracted a lot of attention from the hot star community following the discovery of numerous He i emission line sources (Krabbe et al. 1991). Recent...
Dessart, Luc, Blondin, Stephane, Brown, Peter J., Hicken, Malcolm, Hillier, D. John, Holland, Stephen T., ...
We analyze the Type II Plateau supernovae (SN II-P) 2005cs and 2006bp with the non-LTE model atmosphere code CMFGEN. We fit 13 spectra in the first month for SN 2005cs and 18 for SN 2006bp. {\sl...
Dessart, Luc, Burrows, Adam, Livne, Eli, Ott, Christian
Recent stellar evolutionary calculations of low-metallicity massive fast-rotating main-sequence stars yield iron cores at collapse endowed with high angular momentum. It is thought that high angular...
Time-dependent Effects in Photospheric-Phase Type II Supernova Spectra (2007)
Dessart, Luc, Hillier, D. John
Spectroscopic modeling of Type II supernovae (SNe) generally assumes steady-state. Following the recent suggestion of Utrobin & Chugai, but using the 1D non-LTE line-blanketed model atmosphere code...
Dessart, Luc, Burrows, Adam, Livne, Eli, Ott, Christian
We present 2D multi-group flux-limited diffusion magnetohydrodynamics (MHD) simulations of the Accretion-Induced Collapse (AIC) of a rapidly-rotating white dwarf. We focus on the dynamical role of...
Burrows, Adam, Dessart, Luc, Livne, Eli, Ott, Christian D., Murphy, Jeremiah
We present here the first 2D rotating, multi-group, radiation magnetohydrodynamics (RMHD) simulations of supernova core collapse, bounce, and explosion. In the context of rapid rotation, we focus on...
A Two-Dimensional MagnetoHydrodynamics Scheme for General Unstructured Grids (2007)
Livne, Eli, Dessart, Luc, Burrows, Adam, Meakin, Casey A.
We report a new finite-difference scheme for two-dimensional magnetohydrodynamics (MHD) simulations, with and without rotation, in unstructured grids with quadrilateral cells. The new scheme is...
Multi-Dimensional Explorations in Supernova Theory (2007)
Burrows, Adam, Dessart, Luc, Ott, Christian D., Livne, Eli
In this paper, we bring together various of our published and unpublished findings from our recent 2D multi-group, flux-limited radiation hydrodynamic simulations of the collapse and explosion of the...
Brown, Peter J., Dessart, Luc, Holland, Stephen T., Immler, Stefan, Landsman, Wayne, Blondin, Stéphane, ...
Time-dependence Effects in Photospheric-Phase Type II Supernova Spectra (2007)
Because of radiative cooling and the fast expansion of the exploding mantle of the progenitor massive star, photospheric-phase Type II SN spectra evolve rapidly. At shock breakout the spectral energy
Early Ultraviolet, Optical and X-Ray Observations of the Type IIP SN 2005cs in M51 with Swift (2006)
Brown, Peter J., Dessart, Luc, Holland, Stephen T., Immler, Stefan, Landsman, Wayne, Blondin, Stephane, ...
We report early photospheric-phase observations of the Type IIP Supernova (SN) 2005cs obtained by Swift's Ultraviolet-Optical and X-Ray Telescopes. Observations started within two days of discovery...
Multi-Dimensional Explorations in Supernova Theory (2006)
Burrows, Adam, Dessart, Luc, Ott, Christian D., Livne, Eli
In this paper, we bring together various of our published and unpublished findings from our recent 2D multi-group, flux-limited radiation hydrodynamic simulations of the collapse and explosion of the...
Time-dependence Effects in Photospheric-Phase Type II Supernova Spectra (2006)
We have incorporated time-dependent terms into the statistical and radiative equilibrium calculations of the non-LTE line-blanketed radiative transfer code CMFGEN. To illustrate the significant...
A New Mechanism for Gravitational Wave Emission in Core-Collapse Supernovae (2006)
Ott, Christian D., Burrows, Adam, Dessart, Luc, Livne, Eli
We present a new theory for the gravitational wave signatures of core-collapse supernovae. Previous studies identified axisymmetric rotating core collapse, core bounce, postbounce convection, and...
Dessart, Luc, Burrows, Adam, Ott, Christian, Livne, Eli, Yoon, Sung-Chul, Langer, Norbert
We present 2.5D radiation-hydrodynamics simulations of the accretion-induced collapse (AIC) of white dwarfs, starting from 2D rotational equilibrium configurations of a 1.46-Msun and a 1.92-Msun...
Multi-Dimensional Radiation/Hydrodynamic Simulations of Protoneutron Star Convection (2006)
Dessart, Luc, Burrows, Adam, Livne, Eli, Ott, Christian D.
Based on multidimensional, multigroup, flux-limited-diffusion hydrodynamic simulations of core-collapse supernovae with the VULCAN/2D code, we study the physical conditions within and in the vicinity...
A New Mechanism for Core-Collapse Supernova Explosions (2006)
Burrows, Adam, Livne, Eli, Dessart, Luc, Ott, Christian D., Murphy, Jeremiah
We present a new mechanism for core-collapse supernova explosions that relies upon acoustic power generated in the inner core as the driver. In our simulation using an 11-solar-mass progenitor, a...
A New Mechanism for Gravitational-Wave Emission in Core-Collapse Supernovae (2006)
Ott, Christian D., Burrows, Adam, Dessart, Luc, Livne, Eli
We present a new theory for the gravitational wave signatures of core-collapse supernovae. Previous studies identified axisymmetric rotating core collapse, core bounce, postbounce convection, and...
Ott, Christian D., Burrows, Adam, Dessart, Luc, Livne, Eli, Yoon, Sung-Chul, Langer, Norbert
We present 2.5D radiation-hydrodynamics simulations of the accretion-induced collapse (AIC) of white dwarfs, starting from 2D rotational equilibrium configurations of a 1.46-Msun and a 1.92-Msun...
An acoustic mechanism for core-collapse supernova explosions (2006)
Burrows, Adam, Livne, Eli, Dessart, Luc, Ott, Christian D., Murphy, Jeremiah
We present a new mechanism for core-collapse supernova explosions that relies upon acoustic power generated in the inner core as the driver. In our simulation using an 11-solar-mass progenitor, a...
Using Line Profiles to Test the Fraternity of Type Ia Supernovae at High and Low Redshifts (2006)
Blondin, Stéphane, Dessart, Luc, Leibundgut, Bruno, Branch, David, Höflich, Peter, Tonry, John L., ...
Using archival data of low-redshift (z < 0.01; Center for Astrophysics and SUSPECT databases) Type Ia supernovae (SNe Ia) and recent observations of high-redshift (0.16 < z < 0.64) SNe Ia, we study...
Using Line Profiles to Test the Fraternity of Type Ia Supernovae at High and Low Redshifts (2006)
Blondin, Stéphane, Dessart, Luc, Leibundgut, Bruno, Branch, David, Höflich, Peter, Tonry, John L., ...
Using archival data of low-redshift (z < 0.01; Center for Astrophysics and SUSPECT databases) Type Ia supernovae (SNe Ia) and recent observations of high-redshift (0.16 < z < 0.64) SNe Ia, we study...
A New Mechanism for Core-Collapse Supernova Explosions (2005)
Burrows, Adam, Livne, Eli, Dessart, Luc, Ott, Christian, Murphy, Jeremiah
We present a new mechanism for core-collapse supernova explosions that relies upon acoustic power generated in the inner core as the driver. In our simulation using an 11-solar-mass progenitor, a...
Quantitative spectroscopic analysis of and distance to SN1999em (2005)
Dessart, Luc, Hillier, D. John
This work presents a detailed quantitative spectroscopic analysis of, and the determination of the distance to, the type II supernovae (SN) SN1999em with CMFGEN (Dessart & Hillier 2005a), based on...
Distance determinations using type II supernovae and the expanding photosphere method (2005)
Dessart, Luc, Hillier, D. John
Due to their high intrinsic brightness, type II supernovae (SN) can be used as lighthouses to constrain distances in the Universe using variants of the Baade-Wesselink method. Based on a large set of...
Quantitative Spectroscopy of Photospheric-Phase Type II Supernovae (2005)
We present first results on the quantitative spectroscopic analysis of the photospheric-phase of Type II supernovae (SN). The analyses are based on the non-LTE model atmosphere code, CMFGEN, of...
We present initial attempts to include the multi-dimensional nature of radiation transport in hydrodynamical simulations of the small-scale structure that arises from the line-driven instability in...
Inferring hot-star-wind acceleration from Line Profile Variability (2004)
The migration of profile sub-peaks identified in time-monitored optical emission lines of Wolf-Rayet star spectra provides a direct diagnostic of the dynamics of their stellar winds via a measured...
Wolf-Rayet stars in M33 - I. Optical spectroscopy using CFHT-MOS (2004)
Abbott, B., Crowther, Paul A., Drissen, Laurent, Dessart, Luc, Martin, Pierre, Boivin, Guillaume
Crowther, Paul A., Dessart, Luc, Hillier, D. John, Abbott, Jay B., Fullerton, Alex W.
We use ultraviolet space-based (FUSE, HST) and optical/IR ground-based (2.3m MSSSO, NTT) spectroscopy to determine the physical parameters of six WC4-type Wolf-Rayet stars in the Large Magellanic...
Quantitative analysis of WC stars: Constraints on neon abundances from ISO/SWS spectroscopy (2000)
Dessart, Luc, Crowther, Paul A., Hillier, D. John, Willis, Allan J., Morris, Patrick W., Van Der Hucht, Karel A.
Neon abundances are derived in four Galactic WC stars -- gamma Vel (WR11, WC8+O7.5III), HD156385 (WR90, WC7), HD192103 (WR135, WC8), and WR146 (WC5+O8) - using mid-infrared fine structure lines...
A New Mechanism for Core-Collapse Supernova Explosions
Burrows,Adam, Livne,Eli, Dessart,Luc, Ott,Christian, Murphy,Jeremiah
We present a new mechanism for core-collapse supernova explosions that relies upon acoustic power generated in the inner core as the driver. In our simulation using an 11-solar-mass progenitor, a...