Bright Star Subtraction Pipeline for LSST: Phase one report

Abstract

We present the phase one report of the Bright Star Subtraction (BSS) pipeline for the Vera C. Rubin Observatory's Legacy Survey of Space and Time (LSST). This pipeline is designed to create an extended PSF model by utilizing observed stars, followed by subtracting this model from the bright stars present in LSST data. Running the pipeline on Hyper Suprime-Cam (HSC) data shows a correlation between the shape of the extended PSF model and the position of the detector within the camera's focal plane. Specifically, detectors positioned closer to the focal plane's edge exhibit reduced circular symmetry in the extended PSF model. To mitigate this effect, we present an algorithm that enables users to account for the location dependency of the model. Our analysis also indicates that the choice of normalization annulus is crucial for modeling the extended PSF. Smaller annuli can exclude stars due to overlap with saturated regions, while larger annuli may compromise data quality because of lower signal-to-noise ratios. This makes finding the optimal annulus size a challenging but essential task for the BSS pipeline. Applying the BSS pipeline to HSC exposures allows for the subtraction of, on average, 100 to 700 stars brighter than 12th magnitude measured in g-band across a full exposure, with a full HSC exposure comprising ~100 detectors.

11 pages, 8 figures, published in Proc. SPIE 13101, Software and Cyberinfrastructure for Astronomy VIII, 131013N (25 July 2024)

References in corpus (15)

• The Gaia mission
• Gaia Data Release 3: Summary of the content and survey properties
• LSST: from Science Drivers to Reference Design and Anticipated Data Products
• The Hyper Suprime-Cam SSP Survey: Overview and Survey Design
• The Hyper Suprime-Cam Software Pipeline
• Third Data Release of the Hyper Suprime-Cam Subaru Strategic Program
• Gaia Data Release 3: Catalogue Validation
• The Sloan Digital Sky Survey extended point spread functions
• The buildup of the intracluster light of Abell 85 as seen by Subaru's Hyper Suprime-Cam
• The Growth of Intracluster Light in XCS-HSC Galaxy Clusters from $0.1<z<0.5$
• Galaxy and Mass Assembly (GAMA): Extended Intra-Group Light in a group at $z=0.2$ from deep Hyper-Suprime Cam images
• The Vera Rubin Observatory Legacy Survey of Space and Time and the Low Surface Brightness Universe
• Strategies for optimal sky subtraction in the low surface brightness regime
• Sky Subtraction in an Era of Low Surface Brightness Astronomy
• The Hyper Suprime-Cam extended Point Spread Functions and applications