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Title:
Spectroscopic Observations and Analysis of the Peculiar SN 1999aa
Authors:
Garavini, G.; Folatelli, G.; Goobar, A.; Nobili, S.; Aldering, G.; Amadon, A.; Amanullah, R.; Astier, P.; Balland, C.; Blanc, G.; Burns, M. S.; Conley, A.; Dahlén, T.; Deustua, S. E.; Ellis, R.; Fabbro, S.; Fan, X.; Frye, B.; Gates, E. L.; Gibbons, R.; Goldhaber, G.; Goldman, B.; Groom, D. E.; Haissinski, J.; Hardin, D.; Hook, I. M.; Howell, D. A.; Kasen, D.; Kent, S.; Kim, A. G.; Knop, R. A.; Lee, B. C.; Lidman, C.; Mendez, J.; Miller, G. J.; Moniez, M.; Mourão, A.; Newberg, H.; Nugent, P. E.; Pain, R.; Perdereau, O.; Perlmutter, S.; Prasad, V.; Quimby, R.; Raux, J.; Regnault, N.; Rich, J.; Richards, G. T.; Ruiz-Lapuente, P.; Sainton, G.; Schaefer, B. E.; Schahmaneche, K.; Smith, E.; Spadafora, A. L.; Stanishev, V.; Walton, N. A.; Wang, L.; Wood-Vasey, W. M.
Affiliation:
AA(Department of Physics, Stockholm University, AlbaNova University Center, S-106 91 Stockholm, Sweden.), AB(Department of Physics, Stockholm University, AlbaNova University Center, S-106 91 Stockholm, Sweden.), AC(Department of Physics, Stockholm University, AlbaNova University Center, S-106 91 Stockholm, Sweden.), AD(Department of Physics, Stockholm University, AlbaNova University Center, S-106 91 Stockholm, Sweden.), AE(Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720.; Visiting Astronomer, Cerro Tololo Inter-American Observatory, National Optical Astronomy Observatory, which is operated by the Association of Universities for Research in Astronomy (AURA), Inc., under cooperative agreement with the National Science Foundation.), AF(DAPNIA-SPP, CEA Saclay, F-91191 Gif-sur-Yvette, France.), AG(Department of Physics, Stockholm University, AlbaNova University Center, S-106 91 Stockholm, Sweden.), AH(Laboratoire de Physique Nucléaire et de Hautes Energies, CNRS-IN2P3, University of Paris VI and VII, Paris, France.), AI(Laboratoire de Physique Nucléaire et de Hautes Energies, CNRS-IN2P3, University of Paris VI and VII, Paris, France.; Université Paris Sud, IAS-CNRS, bâtiment 121, F-91405 Orsay Cedex, France.), AJ(Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720.; Osservatorio Astronomico di Padova, INAF, vicolo dell'Osservatorio 5, I-35122 Padova, Italy.), AK(Colorado College, 14 East Cache La Poudre Street, Colorado Springs, CO 80903.), AL(Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720.; Visiting Astronomer, Cerro Tololo Inter-American Observatory, National Optical Astronomy Observatory, which is operated by the Association of Universities for Research in Astronomy (AURA), Inc., under cooperative agreement with the National Science Foundation.; Department of Physics, University of California, Berkeley, CA 94720-7300.), AM(Stockholm Observatory, AlbaNova University Center, S-106 91 Stockholm, Sweden.; Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218.), AN(Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720.; American Astronomical Society, 2000 Florida Avenue, NW, Suite 400, Washington, DC 20009.), AO(Department of Astronomy, California Institute of Technology, Mail Stop 105-24, 1201 East California Boulevard, Pasadena, CA 91125.), AP(Centro Multidisplinar de Astrofísica (CENTRA) and Departmento de Física, IST, Universidade Técnico de Lisboa, Avenida Rovisco Pais, P-1049-001 Lisboa, Portugal.), AQ(Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721.), AR(Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720.), AS(UCO/Lick Observatory, Univeristy of California, Santa Cruz, CA 95064.), AT(Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720.), AU(Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720.; Department of Physics, University of California, Berkeley, CA 94720-7300.), AV(Department of Astronomy, New Mexico State University, Department 4500, P.O. Box 30001, Las Cruces, NM 88011.), AW(Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720.), AX(Laboratoire de l'Accélerateur Linéaire, IN2P3-CNRS, Université Paris Sud, B.P. 34, 91898 Orsay Cedex, France.), AY(Laboratoire de Physique Nucléaire et de Hautes Energies, CNRS-IN2P3, University of Paris VI and VII, Paris, France.), AZ(Department of Physics, University of Oxford, Nuclear and Astrophysics Laboratory, Keble Road, Oxford OX1 3RH, UK.), BA(Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720.), BB(Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720.), BC(Fermi National Accelerator Laboratory, P.O. Box 500, Batavia, IL 60510.), BD(Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720.), BE(Department of Physics and Astronomy, Vanderbilt University, Nashville, TN 37240.), BF(Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720.), BG(European Southern Observatory, Alonso de Cordova 3107, Vitacura, Casilla 19001, Santiago 19, Chile.), BH(Isaac Newton Group, Apartado de Correos 321, Santa Cruz de La Palma, E-38780 Tenerife, Spain.; Department of Astronomy, University of Barcelona, Martí i Franques 1, E-08028 Barcelona, Spain.), BI(Department of Astronomy, San Diego State University, 5500 Campanile Drive, San Diego, CA 92182-1221.; Department of Astronomy, University of Illinois, 1002 West Green Street, Urbana, IL 61801.), BJ(Laboratoire de l'Accélerateur Linéaire, IN2P3-CNRS, Université Paris Sud, B.P. 34, 91898 Orsay Cedex, France.), BK(Centro Multidisplinar de Astrofísica (CENTRA) and Departmento de Física, IST, Universidade Técnico de Lisboa, Avenida Rovisco Pais, P-1049-001 Lisboa, Portugal.), BL(Department of Physics, Rensselaer Polytechnic Institute, SC1C25, Troy, NY 12180.), BM(Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720.), BN(Laboratoire de Physique Nucléaire et de Hautes Energies, CNRS-IN2P3, University of Paris VI and VII, Paris, France.), BO(Laboratoire de l'Accélerateur Linéaire, IN2P3-CNRS, Université Paris Sud, B.P. 34, 91898 Orsay Cedex, France.), BP(Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720.), BQ(Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720.), BR(Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720.), BS(Laboratoire de Physique Nucléaire et de Hautes Energies, CNRS-IN2P3, University of Paris VI and VII, Paris, France.), BT(Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720.), BU(DAPNIA-SPP, CEA Saclay, F-91191 Gif-sur-Yvette, France.), BV(Princeton University Observatory, Peyton Hall, Princeton, NJ 08544.), BW(Department of Astronomy, University of Barcelona, Martí i Franques 1, E-08028 Barcelona, Spain.), BX(Laboratoire de Physique Nucléaire et de Hautes Energies, CNRS-IN2P3, University of Paris VI and VII, Paris, France.), BY(Department of Physics and Astronomy, Louisiana State University, Baton Rouge, LA 70803.), BZ(Laboratoire de Physique Nucléaire et de Hautes Energies, CNRS-IN2P3, University of Paris VI and VII, Paris, France.), CA(Department of Physics and Astronomy, Vanderbilt University, Nashville, TN 37240.), CB(Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720.), CC(Department of Physics, Stockholm University, AlbaNova University Center, S-106 91 Stockholm, Sweden.), CD(Institute of Astronomy, Madingley Road, Cambridge CB3 0HA, UK.), CE(Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720.), CF(Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720.; Department of Physics, University of California, Berkeley, CA 94720-7300.)
Publication:
The Astronomical Journal, Volume 128, Issue 1, pp. 387-404. (AJ Homepage)
Publication Date:
07/2004
Origin:
UCP
AJ Keywords:
Stars: Supernovae: General, supernovae: individual (SN 1999aa)
DOI:
10.1086/421747
Bibliographic Code:
2004AJ....128..387G

Abstract

We present an extensive new time series of spectroscopic data of the peculiar SN 1999aa in NGC 2595. Our data set includes 25 optical spectra between -11 and +58 days with respect to B-band maximum light, providing an unusually complete time history. The early spectra resemble those of an SN 1991T-like object but with a relatively strong Ca H and K absorption feature. The first clear sign of Si II λ6355, characteristic of Type Ia supernovae, is found at day -7, and its velocity remains constant up to at least the first month after B-band maximum light. The transition to normal-looking spectra is found to occur earlier than in SN 1991T, suggesting SN 1999aa as a possible link between SN 1991T-like and Branch-normal supernovae. Comparing the observations with synthetic spectra, doubly ionized Fe, Si, and Ni are identified at early epochs. These are characteristic of SN 1991T-like objects. Furthermore, in the day -11 spectrum, evidence is found for an absorption feature that could be identified as high velocity C II λ6580 or Hα. At the same epoch C III λ4648.8 at photospheric velocity is probably responsible for the absorption feature at 4500 Å. High-velocity Ca is found around maximum light together with Si II and Fe II confined in a narrow velocity window. Implied constraints on supernovae progenitor systems and explosion hydrodynamic models are briefly discussed.
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