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Hydrogen and helium traces in type Ib-c supernovae
A. Elmhamdi, I. J. Danziger, D. Branch +3
The spectroscopic properties of a selected optical photospheric spectra of core collapse supernovae (CCSNe) are investigated.Special attention is devoted to traces of hydrogen at e…
Supernova Cosmology and the ESSENCE project
Jesper Sollerman, Claudio Aguilera, Andy Becker +27
The proper usage of Type Ia supernovae (SNe Ia) as distance indicators has revolutionized cosmology, and added a new dominant component to the energy density of the Universe, dark…
UBVRI Light Curves of 44 Type Ia Supernovae
Saurabh Jha, Robert P. Kirshner, Peter Challis +2
We present UBVRI photometry of 44 type-Ia supernovae (SN Ia) observed from 1997 to 2001 as part of a continuing monitoring campaign at the Fred Lawrence Whipple Observatory of the…
Hubble Space Telescope Observations of Nine High-Redshift ESSENCE Supernovae
Kevin Krisciunas, Peter M. Garnavich, Peter Challis +29
We present broad-band light curves of nine supernovae ranging in redshift from 0.5 to 0.8. The supernovae were discovered as part of the ESSENCE project, and the light curves are a…
Chemistry and Star Formation in the Host Galaxies of Type Ia Supervovae
J. S. Gallagher, P. M. Garnavich, P. Berlind +3
We study the effect of environment on the properties of type Ia supernovae by analyzing the integrated spectra of 57 local type Ia supernova host galaxies. We deduce from the spect…
Limits from the Hubble Space Telescope on a Point Source in SN 1987A
G. J. M. Graves, P. M. Challis, R. A. Chevalier +16
We observed supernova 1987A (SN 1987A) with the Space Telescope Imaging Spectrograph (STIS) on the Hubble Space Telescope (HST) in 1999 September, and again with the Advanced Camer…