W. David Arnett

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We present the first three-dimensional (3D) simulation of the final minutes of iron core growth in a massive star, up to and including the point of core gravitational instability and collapse. We capture the development of strong convection driven by violent Si burning in the shell surrounding the iron core. This convective burning builds the iron core to(More)
Sirius, the seventh-nearest stellar system, is a visual binary containing the metallic-line A1 V star Sirius A, brightest star in the sky, orbited in a 50.13-year period by Sirius B, the brightest and nearest white dwarf (WD). Based in part on observations with the NASA/ESA Hubble Space Telescope obtained at the Space Telescope Science Institute, and from(More)
We present ultraviolet (UV) spectroscopy and photometry of four Type Ia supernovae (SNe 2004dt, 2004ef, 2005M, and 2005cf) obtained with the UV prism of the Advanced Camera for Surveys on the Hubble Space Telescope. This data set provides unique spectral time series down to 2000 Å. Significant diversity is seen in the near-maximum-light spectra (∼2000–3500(More)
Recent calculations provide convincing evidence that the naturally occurring nuclei were produced in explosions. The required temperature, density and expansion rate strongly suggest that before the explosion the objects were ordinary evolved massive stars. We review these new developments and present a new table indicating our hypothesis concerning the(More)
Xiaofeng Wang1,2,3, Lifan Wang2, Alexei V. Filippenko3, Eddie Baron4, Markus Kromer5, Dennis Jack6, Tianmeng Zhang7, Greg Aldering8, Pierre Antilogus9, W. David Arnett10, Dietrich Baade11, Brian J. Barris12, Stefano Benetti13, Patrice Bouchet14, Adam S. Burrows15, Ramon Canal16, Enrico Cappellaro13, Raymond G. Carlberg17, Elisa di Carlo18, Peter J.(More)
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