2013•The Astrophysical JournalOpen access
PRECISION MEASUREMENT OF THE MOST DISTANT SPECTROSCOPICALLY CONFIRMED SUPERNOVA Ia WITH THEHUBBLE SPACE TELESCOPE
D. Rubin, R. A. Knop, E. S. Rykoff, G. Aldering, R. Amanullah, K. Barbary, M. S. Burns, A. Conley, N. Connolly, Susana E. Deustua, V. Fadeyev, H. K. Fakhouri, A. S. Fruchter, R. Gibbons, G. Goldhaber, A. Goobar, E. Y. Hsiao, Xiaosheng Huang, M. Kowalski, C. Lidman, J. Meyers, J. Nordin, S. Perlmutter, C. Saunders, A. L. Spadafora, V. Stanishev, N. Suzuki, and L. Wang, The Supernova Cosmology Project
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Abstract
We report the discovery of a redshift 1.71 supernova in the GOODS-North field. The Hubble Space Telescope ( HST ) ACS spectrum has almost negligible contamination from the host or neighboring galaxies. Although the rest-frame-sampled range is too blue to include any Si ii line, a principal component analysis allows us to confirm it as a Type Ia supernova with 92% confidence. A recent serendipitous archival HST WFC3 grism spectrum contributed a key element of the confirmation by giving a host-galaxy redshift of 1.713 ± 0.007. In addition to being the most distant SN Ia with spectroscopic confirmation, this is the most distant Ia with a precision color measurement. We present the ACS WFC and NICMOS 2 photometry and ACS and WFC3 spectroscopy. Our derived supernova distance is in agreement with the prediction of ΛCDM.
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