Direct Analysis of Spectra of the Peculiar Type Ia Supernova 2000cx

Details Direct Analysis of Spectra of the Peculiar Type Ia Supernova 2000cx Direct Analysis of Spectra of the Peculiar Type Ia Supernova 2000cx

2004-01-15

arxiv.org/abs/astro-ph/0401324v1

Astrophys.J. 606 (2004) 413-423

Astronomy and Astrophysics

Astrophysics

41 pages including 21 figures, accepted by ApJ

Scientific paper

10.1086/382950

The Type Ia SN 2000cx exhibited multiple peculiarities, including a lopsided B-band light-curve peak that does not conform to current methods for using shapes of light curves to standardize SN Ia luminosities. We use the parameterized supernova synthetic-spectrum code SYNOW to study line identifications in the photospheric-phase spectra of SN 2000cx. Previous work established the presence of Ca II infrared-triplet features forming above velocity about 20,000 km/s, much higher than the photospheric velocity of about 10,000 km/s. We find Ti II features forming at the same high velocity. High-velocity line formation is partly responsible for the photometric peculiarities of SN 2000cx: for example, B-band flux blocking by Ti II absorption features that decreases with time causes the B light curve to rise more rapidly and decline more slowly than it otherwise would. SN 2000cx contains an absorption feature near 4530 A that may be H-beta, forming at the same high velocity. The lack of conspicuous H-alpha and P-alpha signatures does not necessarily invalidate the H-beta identification if the high-velocity line formation is confined to a clump that partly covers the photosphere and the H-alpha and P-alpha source functions are elevated relative to that of resonance scattering. The H-beta identification is tentative. If it is correct, the high-velocity matter must have come from a nondegenerate companion star.

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