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Title:
Hubble Space Telescope Observations of Nine High-Redshift ESSENCE Supernovae1,
Authors:
Krisciunas, Kevin; Garnavich, Peter M.; Challis, Peter; Prieto, Jose Luis; Riess, Adam G.; Barris, Brian; Aguilera, Claudio; Becker, Andrew C.; Blondin, Stephane; Chornock, Ryan; Clocchiatti, Alejandro; Covarrubias, Ricardo; Filippenko, Alexei V.; Foley, Ryan J.; Hicken, Malcolm; Jha, Saurabh; Kirshner, Robert P.; Leibundgut, Bruno; Li, Weidong; Matheson, Thomas; Miceli, Anthony; Miknaitis, Gajus; Rest, Armin; Salvo, Maria Elena; Schmidt, Brian P.; Smith, R. Chris; Sollerman, Jesper; Spyromilio, Jason; Stubbs, Christopher W.; Suntzeff, Nicholas B.; Tonry, John L.; Wood-Vasey, W. Michael
Affiliation:
AA(Department of Physics, University of Notre Dame, 225 Nieuwland Science Hall, Notre Dame, IN 46556-5670 , .), AB(Department of Physics, University of Notre Dame, 225 Nieuwland Science Hall, Notre Dame, IN 46556-5670 , .), AC(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138; , , , .), AD(Department of Astronomy, Ohio State University, 4055 McPherson Laboratory, 140 West 18th Avenue, Columbus, OH 43210; .), AE(Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218; .), AF(Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822; , .), AG(Cerro Tololo Inter-American Observatory, Casilla 603, La Serena, Chile; , , , .), AH(Department of Astronomy, University of Washington, Box 351580, Seattle, WA 98195-1580 , .), AI(European Southern Observatory, Karl-Schwarzschild-Strasse 2, D-85748 Garching, Germany; , , .), AJ(Department of Astronomy, University of California, 601 Campbell Hall, Berkeley, CA 94720-3411 , , , , .), AK(Departamento de Astronomía y Astrofísica, Pontificia Universidad Católica de Chile, Casilla 306, Santiago 22, Chile; .), AL(Department of Astronomy, University of Washington, Box 351580, Seattle, WA 98195-1580 , .), AM(Department of Astronomy, University of California, 601 Campbell Hall, Berkeley, CA 94720-3411 , , , , .), AN(Department of Astronomy, University of California, 601 Campbell Hall, Berkeley, CA 94720-3411 , , , , .), AO(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138; , , , .), AP(Department of Astronomy, University of California, 601 Campbell Hall, Berkeley, CA 94720-3411 , , , , .), AQ(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138; , , , .), AR(European Southern Observatory, Karl-Schwarzschild-Strasse 2, D-85748 Garching, Germany; , , .), AS(Department of Astronomy, University of California, 601 Campbell Hall, Berkeley, CA 94720-3411 , , , , .), AT(National Optical Astronomy Observatory, 950 North Cherry Avenue, Tucson, AZ 85719; .), AU(Department of Physics, University of Washington, Box 351560, Seattle, WA 98195-1560 , .), AV(Department of Physics, University of Washington, Box 351560, Seattle, WA 98195-1560 , .), AW(Cerro Tololo Inter-American Observatory, Casilla 603, La Serena, Chile; , , , .), AX(Research School of Astronomy and Astrophysics, Australian National University, Mount Stromlo and Siding Spring Observatories, Cotter Road, Weston Creek, ACT 2611, Australia; , .), AY(Research School of Astronomy and Astrophysics, Australian National University, Mount Stromlo and Siding Spring Observatories, Cotter Road, Weston Creek, ACT 2611, Australia; , .), AZ(Cerro Tololo Inter-American Observatory, Casilla 603, La Serena, Chile; , , , .), BA(Stockholm Observatory, AlbaNova, SE-106 91 Stockholm, Sweden; .), BB(European Southern Observatory, Karl-Schwarzschild-Strasse 2, D-85748 Garching, Germany; , , .), BC(Department of Physics and Department of Astronomy, Harvard University, 17 Oxford Street, Cambridge, MA 02138; .), BD(Cerro Tololo Inter-American Observatory, Casilla 603, La Serena, Chile; , , , .), BE(Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822; , .), BF(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138; , , , .)
Publication:
The Astronomical Journal, Volume 130, Issue 6, pp. 2453-2472. (AJ Homepage)
Publication Date:
12/2005
Origin:
UCP
AJ Keywords:
Cosmology: Distance Scale, Galaxies: Distances and Redshifts, Stars: Supernovae: General
DOI:
10.1086/497640
Bibliographic Code:
2005AJ....130.2453K

Abstract

We present broadband 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 combination of Cerro Tololo 4 m and Hubble Space Telescope (HST) photometry. On the basis of spectra and/or light-curve fitting, eight of these objects are definitely Type Ia supernovae, while the classification of one is problematic. The ESSENCE project is a 5 yr endeavor to discover about 200 high-redshift Type Ia supernovae, with the goal of tightly constraining the time average of the equation-of-state parameter [w=p/(ρc2)] of the ``dark energy.'' To help minimize our systematic errors, all of our ground-based photometry is obtained with the same telescope and instrument. In 2003 the highest redshift subset of ESSENCE supernovae was selected for detailed study with HST. Here we present the first photometric results of the survey. We find that all but one of the ESSENCE supernovae have slowly declining light curves and that the sample is not representative of the low-redshift set of ESSENCE Type Ia supernovae. This is unlikely to be a sign of evolution in the population. We attribute the decline-rate distribution of HST events to a selection bias at the high-redshift edge of our sample and find that such a bias will infect other magnitude-limited Type Ia supernova searches unless appropriate precautions are taken.

Based in part on observations taken at the Cerro Tololo Inter-American Observatory, National Optical Astronomy Observatory, which is operated by AURA under cooperative agreement with the National Science Foundation (NSF).

Based in part on observations taken with the Very Large Telescope (VLT) under ESO program 170.A-0519.


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