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SN 2006jc: A Wolf-Rayet Star Exploding in a Dense He-Rich Circumstellar Medium
Ryan J. Foley, Nathan Smith, Mohan Ganeshalingam +3
We present optical photometry and spectra of the peculiar Type Ib supernova (SN) 2006jc. Strong and relatively narrow He I emission lines indicate the progenitor star exploded insi…
SN 2006gy: Discovery of the most luminous supernova ever recorded, powered by the death of an extremely massive star like Eta Carinae
Nathan Smith, Weidong Li, Ryan J. Foley +8
(abridged) We report our discovery and observations of the peculiar Type IIn supernova SN2006gy in NGC1260, revealing that it reached a peak magnitude of -22, making it the most lu…
The Peculiar SN 2005hk: Do Some Type Ia Supernovae Explode as Deflagrations?
M. M. Phillips, W. Li, J. A. Frieman +41
We present extensive u'g'r'i'BVRIYJHKs photometry and optical spectroscopy of SN 2005hk. These data reveal that SN 2005hk was nearly identical in its observed properties to SN 2002…
Deviations From Axisymmetry Revealed by Line Polarization in the Normal Type Ia SN 2004S
Ryan Chornock, Alexei V. Filippenko
We present a single epoch of high signal-to-noise ratio spectropolarimetry of the Type Ia supernova (SN Ia) 2004S taken nine days after maximum light. The flux spectrum is normal,…
XTE J1118+480: A Metal-Rich Black Hole Binary in the Galactic Halo
Jonay I. Gonzalez Hernandez, Rafael Rebolo, Garik Israelian +3
We present medium-resolution optical spectra of the secondary star in the high Galactic latitude black hole X-ray binary XTE J1118+480 and determine the abundance of Mg, Al, Ca, Fe…
Late-Time Spectroscopy of SN 2002cx: The Prototype of a New Subclass of Type Ia Supernovae
Saurabh Jha, David Branch, Ryan Chornock +5
We present Keck optical spectra of SN 2002cx, the most peculiar known Type Ia supernova (SN Ia), taken 227 and 277 days past maximum light. Astonishingly, the spectra are not domin…