Author Block |
Christopher D'Andrea1, M. Sako1, J. A. Frieman2, R. Kessler3, J. C. Wheeler4, R. Quimby5, N. Yasuda6, J. Holtzman7, D. P. Schneider8, K. Konishi6, R. C. Nichol9, M. Smith9, J. Sollerman10, S. W. Jha11, B. Dilday11, SDSS-II Collaboration
1University of Pennsylvania, 2Fermi National Accelerator Laboratory, 3The University of Chicago, 4University of Texas, 5California Institute of Technology, 6University of Tokyo, Japan, 7New Mexico State University, 8The Pennsylvania State University, 9University of Portsmouth, United Kingdom, 10Stockholm University, Sweden, 11Rutgers University. |
Abstract |
Using the expansion velocities of the ejecta of Type II-P supernova to standardize the magnitude along the plateau, it has been shown that the dispersion in magnitudes can be reduced to levels that potentially make these objects useful distance indicators. The recently completed Sloan Digital Sky Survey II Supernova Survey spectroscopically confirmed 42 Type II-P supernovae over its 3 years of operation. Based on preliminary studies, we find that 13 of these supernovae are useful for cosmology, having sufficient photometry and spectroscopy to standardize using the expansion velocity - plateau luminosity method, doubling the size of the published sample. We present preliminary results from this analysis and their implications towards future supernova surveys, as well as analysis of the colors and evolution of these hydrogen rich supernovae. |
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