Optical and Near-Infrared Observations of the Peculiar Type Ia Supernova 1999ac

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dc.creatorPhillips, Mark M.
dc.creatorKrisciunas, Kevin
dc.creatorSuntzeff, Nicholas B.
dc.creatorAbraham, R. G.
dc.creatorBeckett, M. G.
dc.creatorBonati, M.
dc.creatorCandia, P.
dc.creatorCorwin, T. M.
dc.creatorDepoy, D. L.
dc.creatorEspinoza, J.
dc.creatorFirth, A. E.
dc.creatorFreedman, W. L.
dc.creatorGalaz, G.
dc.creatorGermany, L.
dc.creatorGonzalez, D.
dc.creatorHamuy, M.
dc.creatorHastings, N. C.
dc.creatorHungerford, A. L.
dc.creatorIvanov, V. D.
dc.creatorLabbe, E.
dc.creatorMarzke, R. O.
dc.creatorMcCarthy, P. J.
dc.creatorMcMahon, R. G.
dc.creatorMcMillan, R.
dc.creatorMuena, C.
dc.creatorPersson, S. E.
dc.creatorRoth, M.
dc.creatorRuiz, M. T.
dc.creatorSmith, R. C.
dc.creatorSmith, R.
dc.creatorStrolger, L. -G.
dc.creatorStubbs, C.
dc.date2006-01-30
dc.date.accessioned2026-07-07T11:57:18Z
dc.date.available2026-07-07T11:57:18Z
dc.descriptionWe present 39 nights of optical photometry, 34 nights of infrared photometry, and 4 nights of optical spectroscopy of the Type Ia SN 1999ac. This supernova was discovered two weeks before maximum light, and observations were begun shortly thereafter. At early times its spectra resembled the unusual SN 1999aa and were characterized by very high velocities in the Ca II H and K lines, but very low velocities in the Si II 6355 A line. The optical photometry showed a slow rise to peak brightness but, quite peculiarly, was followed by a more rapid decline from maximum. Thus, the B- and V-band light curves cannot be characterized by a single stretch factor. We argue that the best measure of the nature of this object is not the decline rate parameter Delta m_15 (B). The B-V colors were unusual from 30 to 90 days after maximum light in that they evolved to bluer values at a much slower rate than normal Type Ia supernovae. The spectra and bolometric light curve indicate that this event was similar to the spectroscopically peculiar slow decliner SN 1999aa.
dc.description42 pages, 14 figures, accepted for publication in the Astronomical Journal (January 28, 2006)
dc.identifierhttps://arxiv.org/abs/astro-ph/0601684
dc.identifierhttp://arxiv.org/abs/astro-ph/0601684
dc.identifierAstron.J.131:2615-2627,2006
dc.identifierdoi:10.1086/503108
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/205835
dc.subjectAstrophysics
dc.titleOptical and Near-Infrared Observations of the Peculiar Type Ia Supernova 1999ac
dc.typetext

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