Authors
Saurabh Jha, Harvard-Smithsonian Center for Astrophysics
Peter M. Garnavich, Harvard-Smithsonian Center for Astrophysics
Robert P. Kirshner, Harvard-Smithsonian Center for AstrophysicsFollow
Peter Challis, Harvard-Smithsonian Center for Astrophysics
Alicia M. Soderberg, Harvard-Smithsonian Center for Astrophysics
Lucas M. Macri, Harvard-Smithsonian Center for Astrophysics
John P. Huchra, Harvard-Smithsonian Center for Astrophysics
Pauline Barmby, Harvard-Smithsonian Center for Astrophysics
Elizabeth J. Barton, Harvard-Smithsonian Center for Astrophysics
Perry Berlind, Harvard-Smithsonian Center for Astrophysics
Warren R. Brown, Harvard-Smithsonian Center for Astrophysics
Nelson Caldwell, Harvard-Smithsonian Center for Astrophysics
Michael L. Calkins, Harvard-Smithsonian Center for Astrophysics
Sheila J. Kannappan, Harvard-Smithsonian Center for Astrophysics
Daniel M. Koranyi, Harvard-Smithsonian Center for Astrophysics
Michael A. Pahre, Harvard-Smithsonian Center for Astrophysics
Kenneth J. Rines, Harvard-Smithsonian Center for Astrophysics
Krzysztof Z. Stanek, Harvard-Smithsonian Center for Astrophysics
Robert P. Stefanik, Harvard-Smithsonian Center for AstrophysicsFollow
Andrew H. Szentgyorgyi, Harvard-Smithsonian Center for Astrophysics
Petri Vaisanen, Harvard-Smithsonian Center for Astrophysics
Zhong Wang, Harvard-Smithsonian Center for Astrophysics
Joseph M. Zajac, Harvard-Smithsonian Center for Astrophysics
Adam G. Riess, University of California - Berkeley
Alexei V. Filippenko, University of California - BerkeleyFollow
Weidong Li, University of California - Berkeley
Maryam Modjaz, University of California - Berkeley
Richard R. Treffers, University of California - BerkeleyFollow
Carl W. Hergenrother, University of Arizona
Eva K. Grebel, University of Washington - Seattle Campus
Patrick Seitzer, University of Michigan - Ann Arbor
George H. Jacoby, Kitt Peak National Observatory
Priscilla J. Benson, Wellesley College
Akbar H. Rizvi '99, Gettysburg CollegeFollow
Laurence A. Marschall, Gettysburg CollegeFollow
Jeffrey D. Goldader, University of Pennsylvania
Matthew Beasley, University of Colorado at Boulder
William D. Vacca, University of Hawaii
Bruno Leibundgut, European Southern ObservatoryFollow
Jason Spyromilio, European Southern Observatory
Brian P. Schmidt, Australian National UniversityFollow
Peter R. Wood, Australian National University
Abstract
We present optical and near-infrared photometry and spectroscopy of the Type Ia SN 1998bu in the Leo I Group galaxy M96 (NGC 3368). The data set consists of 356 photometric measurements and 29 spectra of SN 1998bu between UT 1998 May 11 and July 15. The well-sampled light curve indicates the supernova reached maximum light in B on UT 1998 May 19.3 (JD 2450952.8^0.8) with B\12.22^0.03 and V \11.88^0.02. Application of a revised version of the Multicolor Light Curve Shape (MLCS) method yields an extinction toward the supernova of AV\0.94^0.15 mag, and indicates the supernova was of average luminosity compared to other normal Type Ia supernovae. Using the HST Cepheid distance modulus to M96 and the MLCS Ðtted parameters for the supernova, we derive an extinction-corrected absolute magnitude for SN 1998bu at maximum, MV\[19.42^0.22. Our independent results for this supernova are consistent with those of Suntze et al. Combining SN 1998bu with three other well-observed local calibrators and 42 supernovae in the Hubble Ñow yields a Hubble constant, H0\64 km s~1 Mpc~1, where the error estimate incorporates possible sources of system- ~6 `8 atic uncertainty including the calibration of the Cepheid period-luminosity relation, the metallicity dependence of the Cepheid distance scale, and the distance to the LMC.
Copyright Note
This is the publisher's version of the work. This publication appears in Gettysburg College's institutional repository by permission of the copyright owner for personal use, not for redistribution.
Recommended Citation
Jha, Saurabh, et al. The Type Ia Supernova 1998bu in M96 and the Hubble Constant. The Astrophysical Journal Supplement Series (November 1999) 125:73-97.