|
| | | | |
| | | |
| Stat |
Members: 3645
Articles: 2'504'928
Articles rated: 2609
25 April 2024 |
|
| | | | |
|
Article overview
| |
|
|
Evidence for Spectropolarimetric Diversity in Type Ia Supernovae | | Douglas C. Leonard
; Weidong Li
; Alexei V. Filippenko
; Ryan J. Foley
; Ryan Chornock
; | | Date: |
20 Jun 2005 | | Journal: | Astrophys.J. 632 (2005) 450-475 | | Subject: | astro-ph | | Affiliation: | Caltech), Weidong Li, Alexei V. Filippenko, Ryan J. Foley, and Ryan Chornock (UC Berkeley | | Abstract: | We present single-epoch, post-maximum spectropolarimetry of four Type Ia supernovae (SNe Ia) that span a range of spectral and photometric properties: SN 2002bf and SN 2004dt exhibit unusually high-velocity (HV) absorption lines. SN 1997dt is probably somewhat subluminous, and SN 2003du is slightly overluminous. We detect polarization modulations across strong lines in all four objects, demonstrating that all are intrinsically polarized. However, the nature and degree of the polarization varies considerably. Including all SNe Ia studied thus far, the following order emerges in terms of increasing strength of line-polarization features: ordinary/overluminous < subluminous < HV SNe Ia, with the strength of the line-polarization features increasing from 0.2% in the slightly overluminous SN 2003du to 2% in both of the HV SNe Ia in our study. The most convincing explanation for the line polarization of all objects is partial obscuration of the photosphere by clumps of intermediate-mass elements (IMEs) forged in the explosion; the polarization characteristics of the HV SNe Ia in particular effectively rule out a simple ellipsoidal asphericity as the root cause of their line polarization. That SNe Ia are separable into different groups based on their spectropolarimetric characteristics may help narrow down progenitor possibilities and/or explosion physics. In particular, the recently proposed gravitationally confined detonation model may provide an attractive explanation for many of the observed polarization characteristics of HV SNe Ia. | | Source: | arXiv, astro-ph/0506470 | | Services: | Forum | Review | PDF | Favorites | |
|
|
No review found.
Did you like this article?
Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.
browser Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)
|
| |
|
|
|
|
News, job offers and information for researchers and scientists:
| |
REGISTER