LSST light curve simulator

This tool extracts high resolution light curves from the GERLUMPH maps, sampled according to some LSST observing strategy, and is described in detail in Neira, Anguita, & Vernardos (2019).

The source can be set to be either a series of analytical profiles, or uploaded custom user profiles. Once the remaining parameters are also set, the light curves will be computed on Swinburne's gSTAR supercomputer.

The format of the output data is described in the Guide to data. We further provide two python programs to extract and plot the light curve data. These auxilliary programs, together with the main simulations code and instructions on how to install and run it can be found here:

Finally, it is possible to upload a file with predefined parameters that will automatically fill the fields below. We provide an example of such a file here:

example .json file

Currently there is a limit of 10,000 requested light curves per batch.

System properties

RARight ascension [hours]
DECDeclination [°]
zlLens redshift
zsSource redshift
σLens stellar velocity dispersion [km/s]
εefficiency factor for σ
σpeclLens peculiar velocity dispersion [km/s]
σpecsSource peculiar velocity dispersion [km/s]
Velocity of the CMB dipole

Using a parametric model:

$$r_{1/2} = r_0 \; \left( \frac{\lambda}{\lambda_0} \right)^{\nu} [ld],$$

where the parameters are:

r0 = is a reference disc size in light-days,
λ0 = is a reference wavelength in nm,
ν = is the thermal slope of the disc,

we get the half-light radius, r1/2, in each wavelength:

The brightness distribution is:

Using the Shakura-Sunyaev (SS) model:

$$ r_{1/2} = 1.74 \times 10^{-5} \; \lambda^{4/3} \; M_{BH}^{2/3} \; \left( \frac{f_{Edd}}{\eta} \right)^{1/3} [ld],$$

where the parameters are:

MBH = is the mass of the black hole in 109 M,
fEdd = is the Eddington luminoscity,
η = is the accretion efficiency,

we get the half-light radius, r1/2, in each wavelength:

The brightness distribution is:

bandfile to uploadPixel size [ld]
u (365.49)
g (480.03)
r (622.2)
i (754.06)
z (868.21)
y (992.5)

Drag the profile below.

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θ (incl.):





Derived quantities

Pixel size in the source plane:[ld]
Einstein radius in the source plane:[ld]

Magnification map

κSurface mass density at lensed image
γShear at lensed image
sPercentage of smoothly distributed matter
M Mean microlenses' mass [M]
φγ Shear angle [°, east of north]

LSST specifications

OpsimOpsim output
yearsNumber of survey years
Muu-band baseline magnitude
Mgg-band baseline magnitude
Mrr-band baseline magnitude
Mii-band baseline magnitude
Mzz-band baseline magnitude
Myy-band baseline magnitude


Nlcnumber of light curves
start and end point coordinates
a .json file to fill the form fields