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• W2913139214 startingPage "107" @default.
• W2913139214 abstract "Recently, there have been two landmark discoveries of gravitationally lensed supernovae: the first multiply imaged SN, Refsdal, and the first Type Ia SN resolved into multiple images, SN iPTF16geu. Fitting the multiple light curves of such objects can deliver measurements of the lensing time delays, which are the difference in arrival times for the separate images. These measurements provide precise tests of lens models or constraints on the Hubble constant and other cosmological parameters that are independent of the local distance ladder. Over the next decade, accurate time delay measurements will be needed for the tens to hundreds of lensed SNe to be found by wide-field time-domain surveys such as LSST and WFIRST. We have developed an open-source software package for simulations and time delay measurements of multiply imaged SNe, including an improved characterization of the uncertainty caused by microlensing. Using this package, we describe simulations that suggest that a before-peak detection of the leading image enables a more accurate and precise time delay measurement (by ∼1 and ∼2 days, respectively), when compared to an after-peak detection. We also conclude that fitting the effects of microlensing without an accurate prior often leads to biases in the time delay measurement and over-fitting to the data, but that employing a Gaussian Process Regression technique is sufficient for determining the uncertainty due to microlensing." @default.
• W2913139214 created "2019-02-21" @default.
• W2913139214 creator A5059933284 @default.
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• W2913139214 date "2019-05-08" @default.
• W2913139214 modified "2023-10-13" @default.
• W2913139214 title "Turning Gravitationally Lensed Supernovae into Cosmological Probes" @default.
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• W2913139214 doi "https://doi.org/10.3847/1538-4357/ab164a" @default.
• W2913139214 hasPublicationYear "2019" @default.
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