Bright Star Subtraction Pipeline for LSST: Progress Review

TL;DR

This paper reviews the progress of the Bright Star Subtraction pipeline for LSST, which models and subtracts bright stars using an extended PSF, accounting for detector location effects.

Contribution

The paper introduces an algorithm to incorporate detector location dependency into the PSF model for improved star subtraction.

Findings

PSF shape varies with detector position on the focal plane.

The proposed algorithm accounts for location-dependent PSF variations.

Testing on HSC data demonstrates the model's spatial dependency.

Abstract

We present the Bright Star Subtraction (BSS) pipeline for the Vera C. Rubin Observatory's Legacy Survey of Space and Time (LSST). This pipeline generates an extended PSF model using observed stars and subtracts the model from the bright stars in LSST data. When testing the pipeline on Hyper Suprime-Cam (HSC) data, we find that the shape of the extended PSF model depends on the location of the detector on the camera's focal plane. The closer a detector is to the edge of the focal plane, the less the extended PSF model is circularly symmetric. We introduce an algorithm that allows the user to consider the location dependency of the model.