Persistent C II absorption in the normal type Ia supernova 2002fk
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Fecha
2014-07
Profesor/a Guía
Facultad/escuela
Idioma
en
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Título del volumen
Editor
Institute of Physics Publishing
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Licencia CC
Atribution 4.0 International (CC BY 4.0)
Licencia CC
https://creativecommons.org/licenses/by/4.0/deed.es
Resumen
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 v˙Si 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 Cii could be also due to a
viewing angle effect. Adopting the Cepheid distance to NGC 1309 we provide the first H0 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%) H0 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 H0.
Notas
Indexación: Scopus.
Palabras clave
Cosmological Parameters, Cosmology: Observations, Supernovae: General, supernovae:Individual (SN 2002fk), Online-only material: Color Figures
Citación
Astrophysical Journal. Volume 789, Issue 1. 1 July 2014 Article number 89
DOI
DOI: 10.1088/0004-637X/789/1/89