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6 papers · 2 filters
[CoIII] versus NaID in type Ia supernova spectra
Luc Dessart, D. John Hillier, Stephane Blondin +1
The high metal content and fast expansion of supernova (SN) Ia ejecta lead to considerable line overlap in their optical spectra. Uncertainties in composition and ionization furthe…
Constraints on the explosion mechanism and progenitors of type Ia supernovae
Luc Dessart, Stephane Blondin, D. John Hillier +1
Observations of SN 2011fe at early times reveal an evolution analogous to a fireball model of constant color. In contrast, our unmixed delayed detonations of Chandrasekhar-mass whi…
Critical ingredients of supernova Ia radiative-transfer modeling
Luc Dessart, D. John Hillier, Stephane Blondin +1
We explore the physics of SN Ia light curves and spectra using the 1-D non-LTE time-dependent radiative-transfer code CMFGEN. Rather than adjusting ejecta properties to match obser…
Type II-Plateau supernova radiation: dependencies on progenitor and explosion properties
Luc Dessart, D. John Hillier, Roni Waldman +1
We explore the properties of Type II-Plateau (II-P) supernovae (SNe) together with their red-supergiant (RSG) star progenitors. Using MESA STAR, we modulate the parameters (e.g., m…
Massive stars at low metallicity: Evolution and surface abundances of O dwarfs in the SMC
Jean-Claude Bouret, Thierry Lanz, Fabrice Martins +4
We study the evolution, rotation, and surface abundances of O-type dwarfs in the Small Magellanic Cloud. We analyzed the UV and optical spectra of twenty-three objects and derived…
A Bake-Off Between CMFGEN and FASTWIND: Modeling the Physical Properties of SMC and LMC O-type Stars
Philip Massey, Kathryn F. Neugent, D. John Hillier +1
The model atmosphere programs FASTWIND and CMFGEN are both elegantly designed to perform non-LTE analyses of the spectra of hot massive stars, and include sphericity and mass-loss.…