PERSISTENT C II ABSORPTION IN THE NORMAL TYPE Ia SUPERNOVA 2002fk Academic Article uri icon

abstract

  • 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-1 and persisting until 8 days past maximum light with a velocity of 9000 km s-1. SN 2002fk is characterized by a small velocity gradient of km s-1 day-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 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-1 Mpc-1, depending on the absolute magnitude/decline rate relationship adopted. It appears that the near-IR yields somewhat lower (6%-9%) H 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 0. © 2014. The American Astronomical Society. All rights reserved.

author list (cited authors)

  • Cartier, R., Hamuy, M., Pignata, G., Frster, F., Zelaya, P., Folatelli, G., ... Huerta, L.

complete list of authors

  • Cartier, Régis||Hamuy, Mario||Pignata, Giuliano||Förster, Francisco||Zelaya, Paula||Folatelli, Gaston||Phillips, Mark M||Morrell, Nidia||Krisciunas, Kevin||Suntzeff, Nicholas B||Clocchiatti, Alejandro||Coppi, Paolo||Contreras, Carlos||Roth, Miguel||Koviak, Kathleen||Maza, José||González, Luis||González, Sergio||Huerta, Leonor

publication date

  • January 1, 2014 11:11 AM