Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-08-18
Astrophys.J.653:1391-1399,2006
Astronomy and Astrophysics
Astrophysics
13 pages, emulateapj format; accepted in ApJ; expanded discussion of time delay uncertainties
Scientific paper
10.1086/508769
Given the number of recently discovered galaxy-galaxy lens systems, we anticipate that a gravitationally lensed supernova will be observed within the next few years. We explore the possibility that stars in the lens galaxy will produce observable microlensing fluctuations in lensed supernova light curves. For typical parameters, we predict that ~70% of lensed SNe will show microlensing fluctuations > 0.5 mag, while ~25% will have fluctuations > 1 mag. Thus microlensing of lensed supernova will be both ubiquitous and observable. Additionally, we show that microlensing fluctuations will complicate measurements of time delays from multiply imaged supernovae: time delays accurate to better than a few days will be difficult to obtain. We also consider prospects for extracting the lens galaxy's stellar mass fraction and mass function from microlensing fluctuations via a new statistical measure, the time-weighted light curve derivative.
Dobler Gregory
Keeton Charles R.
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