Using the data release 1 of the Hyper Suprime-Cam Subaru Strategic Program covering about 130 square degrees at high galactic latitudes , we have obtained L dwarf counts based on the selection criteria on colors , limiting magnitude and PSF morphology using i , z , and y bands .
3665 L dwarfs brighter than z = 24 have been detected by these criteria .
The surface number counts obtained differentially in z magnitude are compared with predictions of an exponential disk model to estimate the thin-disk scale height in the vicinity of the Sun .
In the exponential disk model , we first fix the local luminosity function ( LLF ) to the mean LLF of Cruz et al .
( 2007 ) and derive the best fit scale height of 260 pc .
However this fit appears to be poor .
We then allow the LLF to vary along with the scale height .
We use the LLF of Cruz et al .
as a starting point .
The best-fit model is found for the vertical scale height of 380 pc .
However the \chi ^ { 2 } minimum is rather broad and the 90 % confidence interval is between 320 and 520 pc .
We investigate another model by varying the scale height and the density of the brightest magnitude bin , while other magnitude bins are fixed to the mean LLF of Cruz et al.. We find an equally good fit with the two free parameters and the best-fit scale height is again 380 pc , but the 90 % confidence interval is between 340 and 420 pc .