• Chemical Compositions Of Thin-Disk, High-Metallicity Red Horizontal-Branch Field Stars 

      Afsar, M.; Sneden, Christopher; For, Bi-Qing (2012-07)
      We present a detailed abundance analysis and atmospheric parameters of 76 stars from a survey to identify field Galactic red horizontal-branch (RHB) stars. High-resolution echelle spectra (R similar or equal to 60,000, S/N ...
    • Emission From Pair-Instability Supernovae With Rotation 

      Chatzopoulos, Emmanouil; van Rossum, Daniel R.; Wheeler, Craig J.; Whalen, Daniel J.; Smidt, Joseph; Wiggins, Brandon (2015-01)
      Pair-instability supernovae (PISNe) have been suggested as candidates for some superluminous supernovae, such as SN 2007bi, and as one of the dominant types of explosion occurring in the early universe from massive, ...
    • Multi-Dimensional Simulations Of Rotating Pair-Instability Supernovae 

      Chatzopoulos, Emmanouil; Wheeler, J. Craig; Couch, Sean M. (2013-10)
      We study the effects of rotation on the dynamics, energetics, and Ni-56 production of pair instability supernova (PISN) explosions by performing rotating two-dimensional ("2.5D") hydrodynamics simulations. We calculate the ...
    • A Panchromatic View Of The Restless SN 2009ip Reveals The Explosive Ejection Of A Massive Star Envelope 

      Margutti, R.; Milisavljevic, Dan; Soderberg, Alicia M.; Chornock, Ryan; Zauderer, B. A.; Murase, K.; Guidorzi, C.; Sanders, N. E.; Kuin, P.; Fransson, C.; Levesque, E. M.; Chandra, P.; Berger, E.; Bianco, F. B.; Brown, Peter J.; Challis, Peter; Chatzopoulos, Emmanouil; Cheung, C. C.; Choi, C.; Chomiuk, L.; Chugai, N.; Contreras, C.; Drout, M. R.; Fesen, R.; Foley, Ryan J.; Fong, W.; Friedman, A. S.; Gall, C.; Gehrels, N.; Hjorth, J.; Hsiao, E.; Kirshner, R.; Im, M.; Leloudas, G.; Lunnan, R.; Marion, G. H.; Martin, J.; Morrell, N.; Neugent, K. F.; Omodei, N.; Phillips, Mark M.; Rest, A.; Silverman, Jeffrey M.; Strader, J.; Stritzinger, Maximillian D.; Szalai, T.; Utterback, N. B.; Vinko, Jozsef; Wheeler, J. Craig; Arnett, D.; Campana, S.; Chevalier, R.; Ginsburg, Adam; Kamble, A.; Roming, Peter W. A.; Pritchard, T.; Stringfellow, G. (2014-01)
      The double explosion of SN 2009ip in 2012 raises questions about our understanding of the late stages of massive star evolution. Here we present a comprehensive study of SN 2009ip during its remarkable rebrightenings. ...