THE HE-RICH CORE-COLLAPSE SUPERNOVA 2007Y: OBSERVATIONS FROM X-RAY TO RADIO WAVELENGTHS
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A detailed study spanning approximately a year has been conducted on the Type Ib supernova (SN) 2007Y. Imaging was obtained from X-ray to radio wavelengths, and a comprehensive set of multi-band (w2m2w1ug riUBVYJHKs) light curves and optical spectroscopy is presented. A virtually complete bolometric light curve is derived, from which we infer a 56Ni mass of 0.06 M. The early spectrum strongly resembles SN 2005bf and exhibits high-velocity features of Ca ii and H; during late epochs the spectrum shows evidence of an ejecta-wind interaction. Nebular emission lines have similar widths and exhibit profiles that indicate a lack of major asymmetry in the ejecta. Late phase spectra are modeled with a non-LTE code, from which we find 56Ni, O, and total-ejecta masses (excluding He) to be 0.06, 0.2, and 0.42 M, respectively, below 4500 km s-1. The 56Ni mass confirms results obtained from the bolometric light curve. The oxygen abundance suggests that the progenitor was most likely a 3.3 M He core star that evolved from a zero-age-main-sequence mass of 10-13 M. The explosion energy is determined to be 1050 erg, and the mass-loss rate of the progenitor is constrained from X-ray and radio observations to be 10-6 M yr-1. SN 2007Y is among the least energetic normal Type Ib SNe ever studied. 2009. The American Astronomical Society. All rights reserved. Printed in the U.S.A.
author list (cited authors)
Stritzinger, M., Mazzali, P., Phillips, M. M., Immler, S., Soderberg, A., Sollerman, J., ... Suntzeff, N. B.
complete list of authors
Stritzinger, Maximilian||Mazzali, Paolo||Phillips, Mark M||Immler, Stefan||Soderberg, Alicia||Sollerman, Jesper||Boldt, Luis||Braithwaite, Jonathan||Brown, Peter||Burns, Christopher R||Contreras, Carlos||Covarrubias, Ricardo||Folatelli, Gaston||Freedman, Wendy L||Gonzalez, Sergio||Hamuy, Mario||Krzeminski, Wojtek||Madore, Barry F||Milne, Peter||Morrell, Nidia||Persson, SE||Roth, Miguel||Smith, Mathew||Suntzeff, Nicholas B