GALEX Spectroscopy of SN 2005ay Suggests Ultraviolet Spectral Uniformity among Type II-P Supernovae

October 2008 • 2008ApJ...685L.117G

Authors • Gal-Yam, A. • Bufano, F. • Barlow, T. A. • Baron, E. • Benetti, S. • Cappellaro, E. • Challis, P. J. • Ellis, R. S. • Filippenko, A. V. • Foley, R. J. • Fox, D. B. • Hicken, M. • Kirshner, R. P. • Leonard, D. C. • Li, W. • Maoz, D. • Matheson, T. • Mazzali, P. A. • Modjaz, M. • Nomoto, K. • Ofek, E. O. • Simon, J. D. • Small, T. A. • Smith, G. P. • Turatto, M. • Van Dyk, S. D. • Zampieri, L.

Abstract • We present the initial results from our GALEX program designed to obtain ultraviolet (UV) spectra of nearby core-collapse supernovae (SNe). Our first target, SN 2005ay in the nearby galaxy NGC 3938, is a typical member of the SN II-P subclass. Our spectra show remarkable similarity to those of the prototypical Type II-P SN 1999em, and resemble also Swift observations of the recent Type II-P SN 2005cs. Taken together, the observations of these three events trace the UV spectral evolution of SNe II-P during the first month after explosion, as required in order to interpret optical observations of high-redshift SNe II-P, and to derive cross-filter K-corrections. While still highly preliminary, the apparent UV homogeneity of SNe II-P bodes well for the use of these events as cosmological probes at high redshift.

Links

• PREPRINT http://arxiv.org/abs/0806.3276
• NED https://ned.ipac.caltech.edu/uri/NED::InRefcode/2008ApJ...685L.117G
• ELECTR https://doi.org/10.1086%2F592744
• SIMBAD http://simbad.u-strasbg.fr/simbo.pl?bibcode=2008ApJ...685L.117G
• PDF https://iopscience.iop.org/article/10.1086/592744/pdf
• DATA https://archive.stsci.edu/mastbibref.php?bibcode=2008ApJ...685L.117G
• DATA https://hst.esac.esa.int/ehst/#/pages/search;bibcode=2008ApJ...685L.117G