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Time Dilation in Type Ia Supernova Spectra at High Redshift
S. Blondin, T. M. Davis, K. Krisciunas +29
We present multiepoch spectra of 13 high-redshift Type Ia supernovae (SNe Ia) drawn from the literature, the ESSENCE and SNLS projects, and our own separate dedicated program on th…
High resolution spectroscopy of the line emission from the inner circumstellar ring of SN 1987A and its hot spots
Per Groeningsson, Claes Fransson, Peter Lundqvist +8
We discuss high resolution VLT/UVES observations (FWHM ~ 6 km/s) from October 2002 (day ~5700 past explosion) of the shock interaction of SN 1987A and its circumstellar ring. A neb…
Infrared Integral Field Spectroscopy of SN 1987A
Karina Kjaer, Bruno Leibundgut, Claes Fransson +3
SN 1987A in the Large Magellanic Cloud is close enough for a study of the very late time evolution of a supernova and its transition to a supernova remnant. Nearly two decades afte…
Observational Constraints on the Nature of the Dark Energy: First Cosmological Results from the ESSENCE Supernova Survey
W. M. Wood-Vasey, G. Miknaitis, C. W. Stubbs +34
We present constraints on the dark energy equation-of-state parameter, w=P/(rho c^2), using 60 Type Ia supernovae (SNe Ia) from the ESSENCE supernova survey. We derive a set of con…
SN 1987A at the end of its second decade
Karina Kjaer, Per Groeningsson, Rubina Kotak +2
After nearly two decades at least five emission mechanisms can be found in SN 1987A. The ejecta continue to glow as a result of the radioactive decay of long-lived nuclei (mostly 4…
Extracting clean supernova spectra
S. Blondin, J. R. Walsh, B. Leibundgut +1
We use a new technique to extract the spectrum of a supernova from that of the contaminating background of its host galaxy, and apply it to the specific case of high-redshift Type…