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Title:
The Luminosity of SN 1999by in NGC 2841 and the Nature of ``Peculiar'' Type Ia Supernovae
Authors:
Garnavich, Peter M.; Bonanos, Alceste Z.; Krisciunas, Kevin; Jha, Saurabh; Kirshner, Robert P.; Schlegel, Eric M.; Challis, Peter; Macri, Lucas M.; Hatano, Kazuhito; Branch, David; Bothun, Gregory D.; Freedman, Wendy L.
Affiliation:
AA(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138; , , , , , .; Department of Physics, 225 Nieuwland Science Hall, University of Notre Dame, Notre Dame, IN 46556; , .), AB(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138; , , , , , .; Wellesley College, Wellesley, MA 02481.), AC(Department of Physics, 225 Nieuwland Science Hall, University of Notre Dame, Notre Dame, IN 46556; , .), AD(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138; , , , , , .), AE(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138; , , , , , .), AF(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138; , , , , , .), AG(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138; , , , , , .), AH(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138; , , , , , .), AI(Department of Physics and Astronomy, Room 131 Nielsen Hall, University of Oklahoma, Norman, OK 73019; .; Department of Astronomy and Research Center for the Early Universe, University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo, Japan.), AJ(Department of Physics and Astronomy, Room 131 Nielsen Hall, University of Oklahoma, Norman, OK 73019; .), AK(Department of Physics, 120 Willamette Hall, University of Oregon, Eugene, OR 97403; . ), AL(Observatories of the Carnegie Institution of Washington, 813 Santa Barbara Street, Pasadena, CA 91101; .)
Publication:
The Astrophysical Journal, Volume 613, Issue 2, pp. 1120-1132. (ApJ Homepage)
Publication Date:
10/2004
Origin:
UCP
ApJ Keywords:
Cosmology: Distance Scale, Galaxies: Individual: NGC Number: NGC 2841, Stars: Supernovae: General, Stars: Supernovae: Individual: Alphanumeric: SN 1957A, Stars: Supernovae: Individual: Alphanumeric: SN 1991bg, Stars: Supernovae: Individual: Alphanumeric: SN 1998bp, Stars: Supernovae: Individual: Alphanumeric: SN 1999by
DOI:
10.1086/422986
Bibliographic Code:
2004ApJ...613.1120G

Abstract

We present UBVRIJHK photometry and optical spectroscopy of the so-called peculiar Type Ia supernova 1999by in NGC 2841. The observations began 1 week before visual maximum light, which is well defined by daily observations. The light curves and spectra are similar to those of the prototypical subluminous event SN 1991bg. We find that maximum light in B occurred on 1999 May 10.3 UT (JD 2,451,308.8+/-0.3) with B=13.66+/-0.02 and a color of Bmax-Vmax=0.51+/-0.03. The late-time color implies minimal dust extinction from the host galaxy. Our photometry, when combined with the recent Cepheid distance to NGC 2841, gives a peak absolute magnitude of MB=-17.15+/-0.23, making SN 1999by one of the least luminous Type Ia events ever observed. We estimate a decline rate parameter of Δm15(B)=1.90 mag, versus 1.93 for SN 1991bg, for which 1.10 is typical for so-called normal events. We compare SN 1999by with other subluminous events and find that the Bmax-Vmax color correlates strongly with the decline rate and may be a more sensitive indicator of luminosity than the fading rate for these objects. We find a good correlation between luminosity and the depth of the spectral feature at 580 nm, which had been attributed solely to Si II. We show that in cooler photospheres the 580 nm feature is dominated by Ti II, which provides a simple physical explanation for the correlation. Using only subluminous Type Ia supernovae, we derive a Hubble parameter of H0=75+12-11 km s-1 Mpc-1, consistent with values found from brighter events.
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