The Type Ia Supernova 1999aw: A Probable1999aa-like Event in a Low-Luminosity HostGalaxy

L.-G. Strolger; R. C. Smith; N. B. Suntzeff; M. M. Phillips; G. Aldering; P. Nugent; R. Knop; S. Perlmutter; R. A. Schommer; L. C. Ho; M. Hamuy; K. Krisciunas; L. M. Germany; R. Covarrubias; P. Candia; A. Athey; G. Blanc; A. Bonacic; T. Bowers; A. Conley; T. Dahlén; W. Freedman; G. Galaz; E. Gates; G. Goldhaber; A. Goobar; D. Groom; I. M. Hook; R. Marzke; M. Mateo; P. McCarthy; J. Méndez; C. Muena; S. E. Persson; R. Quimby; M. Roth; P. Ruiz-Lapuente; J. Seguel; A. Szentgyorgyi; K. von Braun; W. M. Wood-Vasey; T. York

doi:10.1086/343058

The Type Ia Supernova 1999aw: A Probable 1999aa-like Event in a Low-Luminosity Host Galaxy

L.-G. Strolger^1,2, R. C. Smith³, N. B. Suntzeff³, M. M. Phillips⁴, G. Aldering^2,5, P. Nugent^2,5, R. Knop⁵, S. Perlmutter⁵, R. A. Schommer³, L. C. Ho⁶, M. Hamuy⁶, K. Krisciunas³, L. M. Germany^2,7, R. Covarrubias^3,8, P. Candia³, A. Athey¹, G. Blanc⁹, A. Bonacic¹⁰, T. Bowers¹¹, A. Conley^5,12, T. Dahlén¹³, W. Freedman⁶, G. Galaz⁴, E. Gates¹⁴, G. Goldhaber^5,12, A. Goobar¹⁵, D. Groom^2,5, I. M. Hook^16,17, R. Marzke⁶, M. Mateo¹, P. McCarthy⁶, J. Méndez^18,19, C. Muena⁴, S. E. Persson⁶, R. Quimby⁵, M. Roth⁴, P. Ruiz-Lapuente¹⁸, J. Seguel²⁰, A. Szentgyorgyi²¹, K. von Braun¹, W. M. Wood-Vasey^5,12, and T. York⁵

© 2002. The American Astronomical Society. All rights reserved. Printed in U.S.A.
The Astronomical Journal, Volume 124, Number 5 Citation L.-G. Strolger et al 2002 AJ 124 2905 DOI 10.1086/343058

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¹ Department of Astronomy, University of Michigan, 830 Dennison Building, Ann Arbor, MI 48109-1090

² Visiting Astronomer, Cerro Tololo Inter-American Observatory, National Optical Astronomical Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under cooperative agreement with the National Science Foundation

³ Cerro Tololo Inter-American Observatory, National Optical Astronomy Observatory, Casilla 603, La Serena, Chile

⁴ Las Campanas Observatory, Observatories of the Carnegie Institution of Washington, Casilla 601, La Serena, Chile

⁵ Lawrence Berkeley National Laboratory, M/S 50-232, One Cyclotron Road, Berkeley, CA 94720

⁶ Observatories of the Carnegie Institution of Washington, 813 Santa Barbara Street, Pasadena, CA 91101

⁷ European Southern Observatory, Casilla 19001, Santiago 19, Chile

⁸ Department of Astronomy, University of Washington, Box 351580, Seattle, WA 98195-1580

⁹ Service d'Astrophysique, CEA/DSM/DAPNIA, Centre d'Etudes de Saclay, F-91191 Gif-sur-Yvette, France

¹⁰ Pontificia Universidad Católica, Casilla 306, Santiago 22, Chile

¹¹ Department of Physics, University of California, Berkeley, Berkeley, CA 94720-7300

¹² Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721

¹³ Stockholm Observatory, SCFAB, SE-106 91 Stockholm, Sweden

¹⁴ UCO/Lick Observatory, University of California, Santa Cruz, Santa Cruz, CA 95064

¹⁵ Department of Physics, Stockholm University, SCFAB, SE-106 91 Stockholm, Sweden

¹⁶ Institute for Astronomy, Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ, Scotland, UK

¹⁷ Department of Physics, Oxford University, Keble Road, Oxford OX1 3RH, England, UK

¹⁸ Department of Astronomy, University of Barcelona, Martí i Franqués 1, E-08028 Barcelona, Spain

¹⁹ Isaac Newton Group, Apartado de Correos 321, Santa Cruz de la Palma, E-38780 Tenerife, Spain

²⁰ Departmento de Fisica, Universidad de Concepción, Casilla 4009, Concepción, Chile

²¹ Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138

Dates

Received 2002 April 8
Accepted 2002 July 18

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Abstract

SN 1999aw was discovered during the first campaign of the Nearby Galaxies Supernova Search project. This luminous, slow-declining [Δm₁₅(B) = 0.81 ± 0.03] Type Ia supernova was noteworthy in at least two respects. First, it occurred in an extremely low luminosity host galaxy that was not visible in the template images nor in initial subsequent deep imaging. Second, the photometric and spectral properties of this supernova indicate that it very likely was similar to the subclass of Type Ia supernovae whose prototype is SN 1999aa. This paper presents the BVRI and J_sHK_s light curves of SN 1999aw (through ∼100 days past maximum light), as well as several epochs of optical spectra. From these data, we calculate the bolometric light curve and give estimates of the luminosity at maximum light and the initial ⁵⁶Ni mass. In addition, we present deep BVI images obtained recently with the Baade 6.5 m telescope at Las Campanas Observatory that reveal the remarkably low-luminosity host galaxy.

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