Radiative Transfer of Type 1a Supernovae
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1 A Detailed Spectral Line Analysis Homer L. Dodge Department of Physics and Astronomy University of Oklahoma June 15, 2017
2 What is a Supernova? Supernovae occur when stars, commonly either White Dwarfs or Red Giants, destabilize and explode.
3 What is a Supernova? Supernovae occur when stars, commonly either White Dwarfs or Red Giants, destabilize and explode. Sometimes result from binary mergers (two stars collide).
4 What is a Supernova? Supernovae occur when stars, commonly either White Dwarfs or Red Giants, destabilize and explode. Sometimes result from binary mergers (two stars collide). Type 1a Supernovae are highly homogeneous, which makes them good reference points ( standard candles ).
5 What is a Supernova? Supernovae occur when stars, commonly either White Dwarfs or Red Giants, destabilize and explode. Sometimes result from binary mergers (two stars collide). Type 1a Supernovae are highly homogeneous, which makes them good reference points ( standard candles ).
6 Radiative Transfer Radiative transfer theory deals with how EM radiation interacts with materials as it moves through space.
7 Radiative Transfer Radiative transfer theory deals with how EM radiation interacts with materials as it moves through space. Modeling this process in a supernova can help give insight into its physical properties.
8 Radiative Transfer Radiative transfer theory deals with how EM radiation interacts with materials as it moves through space. Modeling this process in a supernova can help give insight into its physical properties. 1 What is the composition and speed of the ejecta? (abundance distribution)
9 Radiative Transfer Radiative transfer theory deals with how EM radiation interacts with materials as it moves through space. Modeling this process in a supernova can help give insight into its physical properties. 1 What is the composition and speed of the ejecta? (abundance distribution) 2 What is the optical depth (thickness) of each element?
10 Radiative Transfer Radiative transfer theory deals with how EM radiation interacts with materials as it moves through space. Modeling this process in a supernova can help give insight into its physical properties. 1 What is the composition and speed of the ejecta? (abundance distribution) 2 What is the optical depth (thickness) of each element? 3 How do these properties evolve in time?
11 Spectral Line Analysis Absorption and emission lines form in the ejecta above the photosphere (opaque surface).
12 Spectral Line Analysis Absorption and emission lines form in the ejecta above the photosphere (opaque surface). Lines form at different wavelengths for different elements.
13 Spectral Line Analysis Absorption and emission lines form in the ejecta above the photosphere (opaque surface). Lines form at different wavelengths for different elements.
14 SYNOW SYNOW (SYnthetic NOW) is a tool for estimating physical characteristics of supernovae based on observed power spectra.
15 SYNOW SYNOW (SYnthetic NOW) is a tool for estimating physical characteristics of supernovae based on observed power spectra. Main feature: SYNOW accounts for multiple scattering.
16 SYNOW SYNOW (SYnthetic NOW) is a tool for estimating physical characteristics of supernovae based on observed power spectra. Main feature: SYNOW accounts for multiple scattering.
17 The Data SYNOW takes in a set of parameters, simulates a supernova, and outputs a synthetic spectrum.
18 The Data SYNOW takes in a set of parameters, simulates a supernova, and outputs a synthetic spectrum.
19 Goals for the Summer Use SYNOW to estimate parameters for SN2012fr.
20 Goals for the Summer Use SYNOW to estimate parameters for SN2012fr. Check these results using more robust techniques.
21 Goals for the Summer Use SYNOW to estimate parameters for SN2012fr. Check these results using more robust techniques. Focus on the velocity evolution of Silicon, which believed to be unusual in SN2012fr.
22 Goals for the Summer Use SYNOW to estimate parameters for SN2012fr. Check these results using more robust techniques. Focus on the velocity evolution of Silicon, which believed to be unusual in SN2012fr.
23 Thank You!
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