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SN~2012cg: Evidence for Interaction Between a Normal Type Ia Supernova and a Non-Degenerate Binary Companion
G. H. Marion, Peter J. Brown, Jozsef Vinkó +26
We report evidence for excess blue light from the Type Ia supernova SN 2012cg at fifteen and sixteen days before maximum B-band brightness. The emission is consistent with predicti…
Type Iax Supernovae: A New Class of Stellar Explosion
Ryan J. Foley, P. J. Challis, R. Chornock +19
We describe observed properties of the Type Iax class of supernovae (SNe Iax), consisting of SNe observationally similar to its prototypical member, SN 2002cx. The class currently…
HST-COS Observations of Hydrogen, Helium, Carbon and Nitrogen Emission from the SN 1987A Reverse Shock
Kevin France, Richard McCray, Steven V. Penton +18
We present the most sensitive ultraviolet observations of Supernova 1987A to date. Imaging spectroscopy from the Hubble Space Telescope-Cosmic Origins Spectrograph shows many narro…
X-ray illumination of the ejecta of Supernova 1987A
J. Larsson, C. Fransson, G. Östlin +25
We present the late-time optical light curve of the ejecta of SN 1987A measured from HST imaging observations spanning the past 17 years. We find that the flux from the ejecta decl…
High Amplitude δ-Scutis in the Large Magellanic Cloud
A. Garg, K. H. Cook, S. Nikolaev +13
We present 2323 High-Amplitude δ-Scuti (HADS) candidates discovered in the Large Magellanic Cloud (LMC) by the SuperMACHO survey (Rest et al. 2005). Frequency analyses of these can…
Direct Confirmation of the Asymmetry of the Cas A Supernova with Light Echoes
A. Rest, R. J. Foley, B. Sinnott +21
We report the first detection of asymmetry in a supernova (SN) photosphere based on SN light echo (LE) spectra of Cas A from the different perspectives of dust concentrations on it…