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24 April 2024 |
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Constraints on Circumstellar Material Around the Type Ia Supernova 2007af | | Joshua D. Simon
; Avishay Gal-Yam
; Bryan E. Penprase
; Weidong Li
; Robert M. Quimby
; Jeffrey M. Silverman
; Carlos Allende Prieto
; J. Craig Wheeler
; Alexei V. Filippenko
; Irene T. Martinez
; Daniel J. Beeler
; Ferdinando Patat
; | | Date: |
10 Sep 2007 | | Abstract: | Patat et al. recently inferred the existence of circumstellar material around
a normal Type Ia supernova (SN) for the first time, finding time-variable Na I
D absorption lines in the spectrum of SN 2006X. We present high-resolution
spectroscopy of the bright SN Ia 2007af at three epochs and search for
variability in any of the Na D absorption components. Over the time range from
4 days before to 24 days after maximum light, we find that the host-galaxy Na D
lines appear to be of interstellar rather than circumstellar origin and do not
vary down to the level of 18 mA (column density of 2 x 10^11 cm^-2). We limit
any circumstellar absorption lines to be weaker than ~10 mA (6 x 10^10 cm^-2).
For the case of material distributed in spherically symmetric shells of radius
~10^16 cm surrounding the progenitor system, we place an upper limit on the
shell mass of ~3 x 10^-8 Msun. We also show that SN 2007af is a photometrically
and spectroscopically normal SN Ia. Assuming that the variable Na D lines in SN
2006X came from circumstellar matter, we therefore conclude that either there
is a preferred geometry for the detection of variable absorption components in
Type Ia supernovae, or SN 2007af and SN 2006X had different types of progenitor
systems. | | Source: | arXiv, 0709.1472 | | Services: | Forum | Review | PDF | Favorites | |
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