Nebular Velocities in Type I[CLC]a[/CLC] Supernovae and Their Relationship to Light Curves | Zendy

P. A. Mazzali | Zendy; E. Cappellaro | Zendy; I. J. Danziger | Zendy; M. Turatto | Zendy; S. Benetti | Zendy

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Nebular Velocities in Type I[CLC]a[/CLC] Supernovae and Their Relationship to Light Curves

Author(s) -

P. A. Mazzali,

E. Cappellaro,

I. J. Danziger,

M. Turatto,

S. Benetti

Publication year - 1998

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/311345

Subject(s) - ejecta , supernova , luminosity , astrophysics , physics , light curve , kinetic energy , full width at half maximum , type (biology) , absolute magnitude , nebula , optics , stars , geology , classical mechanics , galaxy , paleontology

Recently gathered observational data on a sample of Type Ia Supernovae (SNeIa) reveal a wide distribution of expansion velocities of the Fe cores,measured from the width of the nebular lines. Moreover, the velocity appears tocorrelate with the luminosity decline rate after maximum light, $\Deltam_{15}(B)$. Since it has been shown that for SNe Ia $\Delta m_{15}(B)$correlates with the absolute magnitude at maximum, this then implies a relationbetween the expansion velocity of the Fe nebula and the luminosity at maximum.Physically, the maximum luminosity is related to the mass of synthesized$^{56}$Ni, whereas the FWHM of the lines is related to the kinetic energy ofthe ejecta. Our finding constitutes observational proof of the theoreticalprediction that the two quantities have to be related.Comment: 10 pages, including 2 figures - accepted to ApJ Lette

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