September 18, 2009 
Our paper on type Ia supernova spatial distributions and how they can be used to age date SNe Ia has been accepted for publication in ApJ. You can read a draft of it here.
Prompt Ia Supernovae are Significantly Delayed
This is the paper wherein we develop a new observational technique that builds on previous work by Andy Fruchter and others.
Posted in Spatial Distributions 
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September 18, 2009 
A simulation of the collision of a 0.8 solar mass white dwarf (bottom) and a 0.6 solar mass white dwarf (top).
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August 28, 2009 
Bob Greene of LANL has turned his viz talents on our SPH simulation outputs. Here is a sample of what his tools can do.
Pictured here is a single frame from a collision scenario. The two spheres embedded in the larger cloud are simply the cores of the constituent white dwarfs that have yet to merge. We hope to eventually make animations using this technique.
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August 27, 2009 Our paper on white dwarf collisions, On Type Ia Supernovae From The Collisions of Two White Dwarfs, has been accepted by MNRAS. It should be published within a month or so.
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July 2, 2009 
I use this almost every day now and I recommend anyone who relies heavily on a TI-89 or just occasionally wants to compute something check it out.
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July 2, 2009 
I started at LANL this week and will be working here for the remainder of July on reintegrating the changes made to our version of SNSPH into the main code branch.
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May 26, 2009 
The text on the color bars didn’t survive the jpeging process too well.
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May 18, 2009 Evan is a member of the LSST team, and so now our “doughnut method” for constraining type Ia SNe will be a small part of the science goals of the LSST.
To read more about the “doughnut method“, check out our paper on it, Prompt Ia Supernovae are Significantly Delayed which has been submitted to ApJ Letters.
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May 18, 2009 
A poster of one of our white dwarf collision simulations will be on display outside of the SESE office very soon. It will probably also be on display somewhere on the Astronomy floor of the F-wing. Here is the final mockup from Susan Selkirk.
Depicted here, two CO 0.6Msun white dwarfs collide with an impact parameter of 1/2 the white dwarf radius. They detonate as a supernova and end up looking something like Tycho’s SNR shown in the background of the poster. This simulation consisted of approximately 800,000 particles and used a 13 isotope reaction network.
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May 15, 2009 
I recently wrote a visualization routine for SNSPH that incorporates the smoothing kernel and interpolates on a grid. I think the results are pretty impressive. Click each image to get a larger version.
The actual plotting of the routine’s output is done in Veusz.
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