The ESSENCE supernova survey: Survey optimization, observations, and supernova photometry

The ESSENCE supernova survey : Survey optimization, observations, and supernova photometry

authorCount :36
We describe the implementation and optimization of the ESSENCE supernova survey, which we have undertaken to measure the dark energy equation-of-state parameter, w = P/(rho c(2)). We present a method for optimizing the survey exposure times and cadence to maximize our sensitivity to w for a given fixed amount of telescope time. For our survey on the CTIO 4 m telescope, measuring the luminosity distances and redshifts for supernovae at modest redshifts (z approximate to 0: 5 +/- 0: 2) is optimal for determining w. We describe the data analysis pipeline based on using reliable and robust image subtraction to find supernovae automatically and in nearly real time. Since making cosmological inferences with supernovae relies crucially on accurate measurement of their apparent brightnesses, we describe our efforts to establish a thorough calibration of the CTIO 4 m telescope's natural photometric system. In its first four years, ESSENCE has discovered and spectroscopically confirmed 102 Type Ia supernovae, at redshifts from 0.10 to 0.78, identified through an impartial, effective methodology for spectroscopic classification and redshift determination. We present the resulting light curves for all of the Type Ia supernovae found by ESSENCE and used in our measurement of w, presented in a companion paper by Wood-Vasey and coworkers.

NATURVETENSKAP Fysik Astronomi, astrofysik och kosmologi hsv//swe
NATURAL SCIENCES Physical Sciences Astronomy, Astrophysics and Cosmology hsv//eng
cosmology : observations
methods : data analysis
supernovae : general
surveys
Astronomy and astrophysics
Astronomi och astrofysik

Pignata, G. (author)
Rest, A. (author)
Wood-Vasey, W. M. (author)
Blondin, S. (author)
Challis, P. (author)
Smith, R. C. (author)
Stubbs, C. W. (author)
Suntzeff, N. B. (author)
Foley, R. J. (author)
Matheson, T. (author)
Tonry, J. L. (author)
Aguilera, C. (author)
Blackman, J. W. (author)
Becker, A. C. (author)
Clocchiatti, A. (author)
Covarrubias, R. (author)
Davis, T. M. (author)
Filippenko, A. V. (author)
Garg, A. (author)
Garnavich, P. M. (author)
Hicken, M. (author)
Jha, S. (author)
Krisciunas, K. (author)
Kirshner, R. P. (author)
Leibundgut, B. (author)
Li, W. (author)
Miceli, A. (author)
Narayan, G. (author)
Prieto, J. L. (author)
Riess, A. G. (author)
Salvo, M. E. (author)
Schmidt, B. P. (author)
Sollerman, JesperStockholms universitet,Institutionen för astronomi(Swepub:su)solle (author)
Spyromilio, J. (author)
Zenteno, A. (author)
Stockholms universitetInstitutionen för astronomi (creator_code:org_t)

In:Astrophysical Journal: American Astronomical Society666:2, s. 674-6930004-637X1538-4357

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NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Astronomy Astrop ...

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