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23 April 2024 |
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SN~1991T: Reflections of Past Glory | | Brian P. Schmidt
; Robert P. Kirshner
; Bruno Leibundgut
; Lisa A. Wells
; Alain C. Porter
; Pilar Ruiz-Lapuente
; Peter Challis
; Alexei V. Filippenko
; | | Date: |
29 Jul 1994 | | Subject: | astro-ph | | Abstract: | We have obtained photometry and spectra of SN~1991T which extend more than 1000 days past maximum light, by far the longest a SN~Ia has been followed. Although SN~1991T exhibited nearly normal photometric behavior in the first 400 days following maximum, by 600 days its decline had slowed, and by 950~days the supernova brightness was consistent with a constant apparent magnitude of $m_B=21.30$. Spectra near maximum showed minor variations on the SN~Ia theme which grew less conspicuous during the exponential decline. At 270 days the nebular spectrum was composed of Fe and Co lines common to SNe~Ia. However, by 750 days past maximum light, these lines had shifted in wavelength, and were superimposed on a strong blue continuum. The luminosity of SN~1991T at 950 days is more than $9.0 imes10^{38}(D/13~{
m Mpc})^2$~ergs~s$^{-1}$ with a rate of decline of less than $0.04$ mags/100~days. We show that this emission is likely to be light that was emitted by SN~1991T near maximum light which has reflected from foreground dust, much like the light echos observed around SN~1987A. | | Source: | arXiv, astro-ph/9407097 | | Services: | Forum | Review | PDF | Favorites | |
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