AAS 205th Meeting, 9-13 January 2005
Session 131 The Deep Dark Universe
Oral, Wednesday, January 12, 2005, 2:00-3:30pm, Royal Palm 4-6

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[131.06] Strategies for Calibration of a Dark Energy Mission

S. E. Deustua (American Astronomical Society), SNAP Collaboration

The Supernova / Acceleration Probe has as its primary science goal the determination of the properties of the dark energy. Specifically, observations of distant Type Ia supernovae will be used to measure the dark energy equation of state constant parameter, w0, and time varying parameter, w', to a fractional uncertainty of 0.05 and 0.3 respectively. This places stringent requirements on the the absolute color calibration of these supernovae. The overall calibration for the SNAP focal plane will be conducted through several routes. We envision employing a variety of well-studied spectrophotometric standard stars over the wavelength region of interest in the visible and near infrared, including the HST standards, as well as performing indirect transfer calibrations that permit comparison with NIST irradiance standards to close the loop with fundamental MKS quantities. I shall discuss the basic issues and possible strategies in order to achieve less than two percent uncertainty from 350 nm to 1700 nm.

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The author(s) of this abstract have provided an email address for comments about the abstract: deustua@aas.org

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© 2004. The American Astronomical Society.