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Centro de Astrofísica da Universidade do Porto

An early-time infrared and optical study of Type Ia Supernova 1998bu in M962 and [Fe II] in the HH 46/47 Bipolar Outflow

M. Hernandez, W. P. S. Meikle, A. Aparicio, C. Benn, M. Burleigh, A. Chrysostomou, A. J. L. Fernandes, T. R. Geballe, P. L. Hammersley, J. Iglésias-Páramo, D. James, P. A. James, S. N. Kemp, T. Lister, D. Martínez-Delgado, A. Oscoz, D. Pollacco, M. Rozas, S. J. Smartt, P. Sorensen, R. A. Swaters, J. Telting, W. D. Vacca, N. A. Walton, M. R. Zapatero-Osorio

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 AV = 1.0 ± 0.11. We find that SN 1998bu peaked at an intrinsic MV = -19.37 ± 0.23. Adopting a distance modulus of 30.25 (Tanvir et al.) and using Phillips et al.'s relations for the Hubble constant, we obtain H0 = 70.4 ± 4.3 km s-1 Mpc-1. 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-tBmax 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.

Monthly Notices of the Royal Astronomical Society
Volume 319, Page 223
January 2000

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