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Title: Persistent C II absorption in the normal type Ia supernova 2002fk

We present well-sampled UBVRIJHK photometry of SN 2002fk starting 12 days before maximum light through 122 days after peak brightness, along with a series of 15 optical spectra from –4 to +95 days since maximum. Our observations show the presence of C II lines in the early-time spectra of SN 2002fk, expanding at 11,000 km s{sup –1} and persisting until 8 days past maximum light with a velocity of ∼9000 km s{sup –1}. SN 2002fk is characterized by a small velocity gradient of v-dot {sub Si} {sub II}=26 km s{sup –1} day{sup –1}, possibly caused by an off-center explosion with the ignition region oriented toward the observer. The connection between the viewing angle of an off-center explosion and the presence of C II in the early-time spectrum suggests that the observation of C II could be also due to a viewing angle effect. Adopting the Cepheid distance to NGC 1309 we provide the first H {sub 0} value based on near-infrared (near-IR) measurements of a Type Ia supernova (SN) between 63.0 ± 0.8 (±3.4 systematic) and 66.7 ± 1.0 (±3.5 systematic) km s{sup –1} Mpc{sup –1}, depending on the absolute magnitude/decline rate relationship adopted. It appears that the near-IR yieldsmore » somewhat lower (6%-9%) H {sub 0} values than the optical. It is essential to further examine this issue by (1) expanding the sample of high-quality near-IR light curves of SNe in the Hubble flow, and (2) increasing the number of nearby SNe with near-IR SN light curves and precise Cepheid distances, which affords the promise to deliver a more precise determination of H {sub 0}.« less
Authors:
;  [1] ; ; ; ;  [2] ;  [3] ;  [4] ;  [5] ; ; ; ; ;  [6] ; ;  [7] ;  [8] ;  [9] ;  [10]
  1. Millennium Institute of Astrophysics, Casilla 36-D, Santiago (Chile)
  2. Departamento de Astronomía, Universidad de Chile, Casilla 36-D, Santiago (Chile)
  3. Departamento Ciencias Fisicas, Universidad Andres Bello, Av. República 252, Santiago (Chile)
  4. Center for Mathematical Modelling, Universidad de Chile, Avenida Blanco Encalada 2120, Piso 7, Santiago (Chile)
  5. Institute for the Physics and Mathematics of the Universe (IPMU), University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8583 (Japan)
  6. Carnegie Institution of Washington, Las Campanas Observatory, Colina el Pino s/n, Casilla 601 (Chile)
  7. Department of Physics and Astronomy, Texas A and M University, 4242 TAMU, College Station, TX 77843 (United States)
  8. Departamento de Astronomía y Astrofísica, Pontificia Universidad Católica de Chile, Casilla 306, Santiago (Chile)
  9. Department of Astronomy, Yale University, New Haven, CT 06520-8101 (United States)
  10. Carnegie Institution of Washington, 813 Santa Barbara Street, Pasadena, CA 911901 (United States)
Publication Date:
OSTI Identifier:
22356462
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 789; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ABSORPTION; AUGMENTATION; BRIGHTNESS; COSMOLOGY; DISTANCE; EXPLOSIONS; GALAXIES; PHOTOMETRY; SPECTRA; SUPERNOVAE; VELOCITY; VISIBLE RADIATION