Searching for Ultracool Dwarfs in Early LSST Data Products
Easton J. Honaker, John E. Gizis, Christian Aganze, Siddharth Chaini, Federica B. Bianco, Maru\v{s}a \v{Z}erjal, Eduardo L. Mart\'in, Riley W. Clarke, Ashton Southwick, Harrison Petrie, Tyler Blask

TL;DR
This paper evaluates LSST's early data for discovering ultracool dwarfs, identifies candidates, and forecasts thousands of future discoveries in upcoming data releases.
Contribution
It demonstrates LSST's potential for UCD discovery using early data and provides predictions for future data products.
Findings
Recovered known UCDs from multiple catalogs in early LSST data.
Identified 89 UCD candidates, including 17 unique to this work.
Forecasted over 17,000 UCDs may be discovered in future LSST data.
Abstract
The Vera C. Rubin Observatory's Legacy Survey of Space and Time (LSST) promises to drastically accelerate the discovery of ultracool dwarfs (UCDs) over the course of its 10-year survey of the Southern Hemisphere. With the official start of LSST imminent, we showcase LSST's capabilities for discovering and characterizing UCDs using early commissioning data (Data Preview 1). The LSST photometric system at this stage remains poorly understood for faint UCDs. Thus, we begin by cross-matching Data Preview 1 against known UCD catalogs. We recover 1 known UCD from the Ultracool Sheet, 17 UCDs from the Dark Energy Survey, and 17 low mass stars from the Gaia Catalog of Nearby Stars. Using these known UCDs alongside recent spectroscopically-confirmed Euclid objects, we select 89 ultracool dwarf candidates in LSST fields, 17 of which are unique to this work. We present our candidates, a…
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