Microlensing of lensed supernovae

Gregory Dobler, Charles R. Keeton

Research output: Contribution to journalArticlepeer-review

50 Scopus citations


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 hi 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 of >0.5 mag, while ∼25% will have fluctuations of >1 mag. Thus, microlensing of lensed supernova will be both ubiquitous and observable. In addition, 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.

Original languageEnglish (US)
Pages (from-to)1391-1399
Number of pages9
JournalAstrophysical Journal
Issue number2 I
StatePublished - Dec 20 2006

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


  • Galaxies: stellar content
  • Gravitational lensing
  • Supernovae: general


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