• Chemical evolution in low-mass star forming cores 

      Chen, Jo-Hsin (2010-08)
      In this thesis, I focus on the physical and chemical evolution at the earliest stages of low-mass star formation. I report results from the Spitzer Space Telescope and molecular line observations of 9 species toward the ...
    • Collapsar accretion and the gamma-ray burst X-ray light curve 

      Lindner, Christopher Carl (2010-05)
      We present axisymmetric hydrodynamical simulations of the long-term accretion of a rotating gamma-ray burst progenitor star, a "collapsar," onto the central compact object, which we take to be a black hole. The simulations ...
    • Multidimensional multiscale dynamics of high-energy astrophysical flows 

      Couch, Sean Michael (2010-05)
      Astrophysical flows have an enormous dynamic range of relevant length scales. The physics occurring on the smallest scales often influences the physics of the largest scales, and vice versa. I present a detailed study ...
    • Steady-state spherical accretion using smoothed particle hydrodynamics 

      Baumann, Mark Chapple (2011-12)
      Due to its adaptable nature in a broad range of problem domains, Smoothed Particle Hydrodynamics (SPH) is a popular numerical technique for computing solutions in astrophysics. This dissertation discusses the SPH technique ...