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We present a new compilation of Type Ia supernovae (SNe Ia), a new data set of low-redshift nearby-Hubble-flow SNe, and new analysis procedures to workwith these heterogeneous compilations. This ‘‘Union’’ compilation of 414 SNe Ia, which reduces to 307 SNe after selection cuts, includes the recent large samples of SNe Ia from the Supernova Legacy Survey and(More)
We report on work to increase the number of well-measured Type Ia supernovae (SNe Ia) at high redshifts. Light curves, including high signal-to-noise HST data, and spectra of six SNe Ia that were discovered during 2001 are presented. Additionally, for the two SNe with z > 1, we present groundbased J-band photometry from Gemini and the VLT. These are among(More)
e-mail address: gerson@lbl.gov E. O. Lawrence Berkeley National Laboratory, Berkeley California 94720. Center for Particle Astrophysics, U.C. Berkeley, California 94720. LPNHE, CNRS-IN2P3, University of Paris VI & VII, Paris, France. Institute of Astronomy, Cambridge University, Cambridge, U.K. Current address: California Institute of Technology Pasadena,(More)
We report measurements of M, , and w from 11 supernovae (SNe) at z 1⁄4 0:36 0:86 with high-quality light curves measured using WFPC2 on the Hubble Space Telescope (HST). This is an independent set of high-redshift SNe that confirms previous SN evidence for an accelerating universe. The high-quality light curves available from photometry on WFPC2 make it(More)
E. O. Lawrence Berkeley National Laboratory, Berkeley, California, USA Center for Particle Astrophysics, U.C. Berkeley, California, USA Dipartmento di Astronomia, University de Padova, Italy Space Sciences Laboratory, U.C. Berkeley, California, USA Institute of Astronomy, Cambridge, United Kingdom CNRS-IN2P3, University of Paris, Paris, France Observatoire(More)
The proposed SuperNova/Acceleration Probe (SNAP) mission will have a two-meter class telescope delivering diffraction-limited images to an instrumented 0.7 square-degree field sensitive in the visible and near-infrared wavelength regime. We describe the requirements for the instrument suite and the evolution of the focal plane design to the present concept(More)
We have developed a technique to systematically discover and study high-redshift supernovae that can be used to measure the cosmological parameters. We report here results based on the initial seven of >28 supernovae discovered to date in the high-redshift supernova search of the Supernova Cosmology Project. We nd an observational dispersion in peak(More)
The SuperNova / Acceleration Probe (SNAP) is a space-based experiment to measure the expansion history of the Universe and study both its dark energy and the dark matter. The experiment is motivated by the startling discovery that the expansion of the Universe is accelerating. A 0.7 square-degree imager comprised of 36 large format fully-depleted n-type(More)
The SuperNova/Acceleration Probe (SNAP) will measure precisely the cosmological expansion history over both the acceleration and deceleration epochs and thereby constrain the nature of the dark energy that dominates our universe today. The SNAP focal plane contains equal areas of optical CCDs and NIR sensors and an integral field spectrograph. Having over(More)