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Title:
Light Curves of Type Ia Supernovae from Near the Time of Explosion
Authors:
Garg, Arti; Stubbs, Christopher W.; Challis, Peter; Wood-Vasey, W. Michael; Blondin, Stéphane; Huber, Mark E.; Cook, Kem; Nikolaev, Sergei; Rest, Armin; Smith, R. Chris; Olsen, Knut; Suntzeff, Nicholas B.; Aguilera, Claudio; Prieto, Jose Luis; Becker, Andrew; Miceli, Antonino; Miknaitis, Gajus; Clocchiatti, Alejandro; Minniti, Dante; Morelli, Lorenzo; Welch, Douglas L.
Affiliation:
AA(Visiting Astronomer, Cerro Tololo Inter-American Observatory, National Optical Astronomy Observatory, which is operated by the Association of Universities for Research in Astronomy (AURA), Inc., under cooperative agreement with the National Science Foundation.), AB(Department of Physics and Harvard-Smithsonian Center for Astrophysics, Harvard University, Cambridge, MA, USA; ; Visiting Astronomer, Cerro Tololo Inter-American Observatory, National Optical Astronomy Observatory, which is operated by the Association of Universities for Research in Astronomy (AURA), Inc., under cooperative agreement with the National Science Foundation.), AC(Department of Physics and Harvard-Smithsonian Center for Astrophysics, Harvard University, Cambridge, MA, USA; ; Visiting Astronomer, Cerro Tololo Inter-American Observatory, National Optical Astronomy Observatory, which is operated by the Association of Universities for Research in Astronomy (AURA), Inc., under cooperative agreement with the National Science Foundation.), AD(Department of Physics and Harvard-Smithsonian Center for Astrophysics, Harvard University, Cambridge, MA, USA; ; Visiting Astronomer, Cerro Tololo Inter-American Observatory, National Optical Astronomy Observatory, which is operated by the Association of Universities for Research in Astronomy (AURA), Inc., under cooperative agreement with the National Science Foundation.), AE(Department of Physics and Harvard-Smithsonian Center for Astrophysics, Harvard University, Cambridge, MA, USA; ), AF(Lawrence Livermore National Laboratory, Livermore, CA, USA; Visiting Astronomer, Cerro Tololo Inter-American Observatory, National Optical Astronomy Observatory, which is operated by the Association of Universities for Research in Astronomy (AURA), Inc., under cooperative agreement with the National Science Foundation.), AG(Lawrence Livermore National Laboratory, Livermore, CA, USA; Visiting Astronomer, Cerro Tololo Inter-American Observatory, National Optical Astronomy Observatory, which is operated by the Association of Universities for Research in Astronomy (AURA), Inc., under cooperative agreement with the National Science Foundation.), AH(Lawrence Livermore National Laboratory, Livermore, CA, USA), AI(Goldberg Fellow.), AJ(Cerro Tololo Inter-American Observatory/NOAO, La Serena, Chile), AK(Cerro Tololo Inter-American Observatory/NOAO, La Serena, Chile), AL(Cerro Tololo Inter-American Observatory/NOAO, La Serena, Chile), AM(Cerro Tololo Inter-American Observatory/NOAO, La Serena, Chile), AN(Ohio State University, Columbus, OH, USA), AO(University of Washington, Seattle, WA, USA; Visiting Astronomer, Cerro Tololo Inter-American Observatory, National Optical Astronomy Observatory, which is operated by the Association of Universities for Research in Astronomy (AURA), Inc., under cooperative agreement with the National Science Foundation.), AP(University of Washington, Seattle, WA, USA), AQ(Fermi National Accelerator Laboratory, Batavia, IL, USA), AR(Pontificia Universidad Católica de Chile, Santiago, Chile; Visiting Astronomer, Cerro Tololo Inter-American Observatory, National Optical Astronomy Observatory, which is operated by the Association of Universities for Research in Astronomy (AURA), Inc., under cooperative agreement with the National Science Foundation.), AS(Pontificia Universidad Católica de Chile, Santiago, Chile), AT(Pontificia Universidad Católica de Chile, Santiago, Chile), AU(McMaster University, Hamilton, ON, Canada)
Publication:
The Astronomical Journal, Volume 133, Issue 2, pp. 403-419. (AJ Homepage)
Publication Date:
02/2007
Origin:
UCP
AJ Keywords:
Galaxies: Magellanic Clouds, Stars: Supernovae: General, Surveys
DOI:
10.1086/510118
Bibliographic Code:
2007AJ....133..403G

Abstract

We present a set of 11 Type Ia supernova (SN Ia) light curves with dense, premaximum sampling. These supernovae (SNe), in galaxies behind the Large Magellanic Cloud (LMC), were discovered by the SuperMACHO survey. The SNe span a redshift range of z=0.11-0.35. Our light curves contain some of the earliest premaximum observations of SNe Ia to date. We also give a functional model that describes the SN Ia light-curve shape (in our VR band). Our function uses the ``expanding fireball'' model of Goldhaber et al. to describe the rising light curve immediately after explosion but constrains it to smoothly join the remainder of the light curve. We fit this model to a composite observed VR-band light curve of three SNe between redshifts of 0.135 and 0.165. These SNe have not been K-corrected or adjusted to account for reddening. In this redshift range, the observed VR band most closely matches the rest-frame V band. Using the best fit to our functional description of the light curve, we find the time between explosion and observed VR-band maximum to be 17.6+/-1.3(stat)+/-0.07(sys) rest-frame days for a SN Ia with a VR-band Δm-10 of 0.52 mag. For the redshifts sampled, the observed VR-band time of maximum brightness should be the same as the rest-frame V-band maximum to within 1.1 rest-frame days.

This paper includes data gathered with the 6.5 m Magellan telescopes located at Las Campanas Observatory, Chile.


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