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An early-time infrared and optical study of the Type Ia Supernova 1998bu in M96
Authors:M Hernandez  W P S Meikle  A Aparicio  C R Benn  M R Burleigh  A C Chrysostomou  A J L Fernandes  T R Geballe  P L Hammersley  J Iglesias-Paramo  D J James  P A James  S N Kemp  T A Lister  D Martinez-Delgado  A Oscoz  D L Pollacco  M Rozas  S J Smartt  P Sorensen  R A Swaters  J H Telting  W D Vacca  N A Walton  M R Zapatero-Osorio
Institution:Astrophysics Group, Blackett Laboratory, Imperial College of Science, Technology and Medicine, Prince Consort Road, London SW7 2BZ;Instituto de Astrofisica de Canarias, 38200 La Laguna, Tenerife, Spain;and Departamento de Astrofisica, Universidad de La Laguna, Tenerife, Spain;Isaac Newton Group, Apartado de Correos 321, 38700 Santa Cruz de La Palma, Islas Canarias, Spain;Department of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH;Joint Astronomy Centre, 660 N. A'ohoku Place, University Park, Hilo, HI 96720, USA;Centro de Astrofisica da Universidade do Porto, Rua das Estrelas, 4150-762 Porto, Portugal. Instituto Superior da Maia, Portugal;Gemini Observatory, 670 N. A'ohoku Place, Hilo, HI 96720, USA;Department of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews, Fife KY16 9SS;Astrophysics Research Institute, Liverpool John Moores University, Twelve Quays House, Egerton Wharf, Birkenhead L41 1LD;Instituto de Astronomia y Meteorologia, Av. Vallarta No. 2602, Col. Arcos Vallarta, CP 44130, Guadalajara, Jalisco, Mexico;Astrophysics and Planetary Sciences Division, The Queen's University of Belfast, Belfast BT7 1NN;Kapteyn Institute, Rijksuniversiteit Groningen, Postbus 800, 9700 AV Groningen, the Netherlands;IRTF, Institute for Astronomy, 2680 Woodlawn Drive, Honolulu, HI 96822, USA;IoA, University of Cambridge, Madingley Road, Cambridge CB3 0HA
Abstract:We present first-season infrared (IR) and optical photometry and spectroscopy of the Type Ia Supernova 1998bu in M96. We also report optical polarimetry of this event. SN 1998bu is one of the closest type Ia supernovae of modern times, and the distance of its host galaxy is well determined. We find that SN 1998bu is both photometrically and spectroscopically normal. However, the extinction to this event is unusually high, with     We find that SN 1998bu peaked at an intrinsic     Adopting a distance modulus of 30.25 (Tanvir et al.) and using Phillips et al.'s relations for the Hubble constant, we obtain     Combination of our IR photometry with those of Jha et al. provides one of the most complete early-phase IR light curves for a SN Ia published so far. In particular, SN 1998bu is the first normal SN Ia for which good pre- t B max IR coverage has been obtained. It reveals that the J , H and K light curves peak about 5 days earlier than the flux in the B -band curve.
Keywords:supernovae: individual: SN 1998bu
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