ESSENCE: Measuring the Equation of State of the Universe with Supernovae

Details ESSENCE: Measuring the Equation of State of the Universe with Supernovae ESSENCE: Measuring the Equation of State of the Universe with Supernovae

May 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aas...202.2308k&link_type=abstract

American Astronomical Society Meeting 202, #23.08; Bulletin of the American Astronomical Society, Vol. 35, p.728

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Scientific paper

We are in the process of finding and following 200 Type Ia supernovae with the Mosaic Imager on the Blanco 4-m telescope over a five-year period.This search, which shares the Super-MACHO pipeline, is designed to find supernovae over the redshift range [0.15, 0.75]. The survey will obtain VRI photometry which we will supplement with zJ photometry and spectra using Keck, MMT, Magellan, Gemini, and the VLT. We aim to answer a simple, but very important, question: is the dark energy of the universe consistent with a cosmological constant (w=-1)? If not, this means the dark energy must be a more general energy field such as "quintessence." This survey should determine w to +-0.1 (1 sigma). This talk will summarize the state of the field, give a status report on the first year's work, and describe plans for the next season's observing.
This work is supported by the U.S. National Science Foundation.

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