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First-Year Sloan Digital Sky Survey-II Supernova Results: Hubble Diagram and Cosmological Parameters
We present measurements of the Hubble diagram for 103 Type Ia supernovae (SNe) with redshifts 0.04 < z < 0.42, discovered during the first season (Fall 2005) of the Sloan Digital Sky Survey-IIExpand
The supernova-gamma-ray burst connection
SN 1998bw and its corresponding relativistically expanding radio source are coincident with the γ-ray burst source GRB 980425. We searched for other possible supernova-γ-ray burst associations amongExpand
Rates of superluminous supernovae at z ∼ 0.2
We calculate the volumetric rate of superluminous supernovae (SLSNe) based on 5 events discovered with the ROTSE-IIIb telescope. We gather light curves of 19 events from the literature and our ownExpand
Sn 2006gy : Discovery of the most luminous supernova ever recorded, powered by the death of an extremely massive star like η carinae
We report the discovery and early observations of the peculiar Type IIn supernova (SN) 2006gy in NGC 1260. With a peak visual magnitude of about -22, it is the most luminous supernova ever recorded.Expand
Spectroscopy of superluminous supernova host galaxies. A preference of hydrogen-poor events for extreme emission line galaxies
Superluminous supernovae (SLSNe) were only discovered recently due to their preference for occurring in faint dwarf galaxies. Understanding why stellar evolution yields dierent types of stellarExpand
The sloan digital sky survey-II supernova survey: technical summary
The Sloan Digital Sky Survey-II (SDSS-II) has embarked on a multi-year project to identify and measure light curves for intermediate-redshift (0.05 < z < 0.35) Type Ia supernovae (SNe Ia) usingExpand
Spectropolarimetry of Supernovae
Overwhelming evidence has accumulated in recent years that supernova explosions are intrinsically three-dimensional phenomena with significant departures from spherical symmetry. We review theExpand
SN?2005ap: A Most Brilliant Explosion
We present unfiltered photometric observations with ROTSE-III and optical spectroscopic follow-up with HET and the Keck telescope of the most luminous supernova yet identified, SN 2005ap. The spectraExpand
Chemical substructure in the Milky Way halo: A new population of old stars
We report the results of a coherent study of a new class of halo stars defined on the basis of the chemical compositions of three metal-poor objects (½Fe=H �’� 2) that exhibit unusually lowExpand