NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-08-22 T07:32:06 PDT
Help | Comment | NED Home

For refcode 2014ApJ...789...89C:
Retrieve 22 NED objects in this reference.
Please click here for ADS abstract

NED Abstract

Copyright by American Astronomical Society. Reproduced by permission
2014ApJ...789...89C Persistent C II Absorption in the Normal Type Ia Supernova 2002fk Cartier, Regis; Hamuy, Mario; Pignata, Giuliano; Forster, 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, Jose; Gonzalez, Luis; Gonzalez, Sergio; Huerta, Leonor 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 \dot{v}_{Si\,\scriptsize{II}_}=26 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_. This paper includes data gathered with the 6.5 m Magellan Telescopes at Las Campanas Observatory, Chile. Key words: cosmological parameters, cosmology: observations, supernovae: general, supernovae: individual: SN 2002fk
Retrieve 22 NED objects in this reference.
Please click here for ADS abstract

Back to NED Home