T. Bickle

SMDET-1: a Nearby Y Dwarf Candidate

Aaron M. Meisner, Dan Caselden, Federico Marocco +11

We present the discovery of SMDET-1, a red, fast-moving object ( $μ \approx 1.3$ "/yr) identified in time-resolved unWISE coadds using a pixel-level deep learning methodology called S…

A SPHEREx Pipeline and Spectral Library for Ultracool Dwarfs

Jonathan Gagné, Jacqueline K. Faherty, Azul Ruiz Diaz +72

We present a Python spectrophotometry extraction tool tailored for fast-moving point sources detected in the SPHEREx mission, and use it to construct a set of 0.75-5.0 $μ$ m low-res…

astro-ph.SR2026★ 1 cited

Spectroscopic Characterization of WD J000801.25-350450 and its Two Co-Moving Companions

Peter A. Jałowiczor, Thomas P. Bickle, J. Davy Kirkpatrick +18

We present new spectroscopic data for Gaia DR3 2309499817384726016 (WD0008-350A) and its two wide, co-moving, low-mass companions. We confirm the white dwarf is a hydrogen-rich DA,…

Three Thousand Motion-Confirmed L and T Dwarf Candidates from the Backyard Worlds:~Planet 9 Citizen Science Project

Adam C. Schneider, Marc J. Kuchner, Jacqueline K. Faherty +73

The Backyard Worlds: Planet 9 citizen science project uses data from the Wide-field Infrared Survey Explorer to detect infrared objects with significant motion. In this work, we pr…

astro-ph.SR2026★ 3 cited

Clouds with a silicate lining: Using JWST spectra to probe atmospheric diversity in young AB Dor L dwarfs

M. B. Lam, J. M. Vos, G. Suárez +13

We present the first full JWST NIRSpec Prism and MIRI LRS 0.6 - 14 $μ$ m (R ~ 100) spectra and analysis of five ~ 133 Myr L dwarf members of the AB Doradus moving group and one prob…

The Montreal Open Clusters and Associations (MOCA) Database: A Census of Nearby Associations, Open Clusters, and Young Substellar Objects within 500 pc of the Sun

Jonathan Gagné, Leslie Moranta, Jacqueline K. Faherty +10

We present the Montreal Open Clusters and Associations database (MOCAdb), a public MySQL database with a Python interface. MOCAdb provides a census of memberships for 10259 associa…

A search for late-type brown dwarfs in the Euclid Quick Data Release 1

Frank Kiwy, J. Davy Kirkpatrick, Adam C. Schneider +9

We present the identification and characterization of 15 mid-to-late T dwarf candidates in the Euclid Quick Release 1 (Q1) dataset, based on a combined photometric and spectroscopi…

Diversity of Cold Worlds: Predicted Near- to Mid-infrared Spectral Signatures of a Cold Brown Dwarf with Potential Auroral Heating

Genaro Suárez, Jacqueline K. Faherty, Ben Burningham +12

Recent JWST/NIRSpec observations have revealed strong methane emission at 3.326 microns in the $\approx$ 482 K brown dwarf CWISEP J193518.59 $-$ 154620.3 (W1935). Atmospheric modeling…

High Proper Motion Discoveries from the UKIRT Hemisphere Survey

Wings Zhang, Adam C. Schneider, Thomas P. Bickle +31

We used the third data release of the UKIRT Hemisphere Survey to locate previously unrecognized high proper motion objects. We identify a total of 127 new discoveries with total pr…

Unveiling the Infrared Excess of SIPS J2045-6332: Evidence for a Young Stellar Object with Potential Low-Mass Companion

Michiharu Hyogo, Thomas P. Bickle, Joseph R. Biggs +20

The Disk Detective project, a citizen science initiative, aims to identify circumstellar discs around stars by detecting objects with infrared (IR) excess using data from the Wide-…

New Ultracool Companions to Nearby White Dwarfs

Alexia Bravo, Adam C. Schneider, Sarah Casewell +15

We conducted a search for new ultracool companions to nearby white dwarfs using multiple methods, including the analysis of colors and examination of images in both the optical and…

New Cold Subdwarf Discoveries from Backyard Worlds and a Metallicity Classification System for T Subdwarfs

Adam J. Burgasser, Adam C. Schneider, Aaron M. Meisner +36

We report the results of a spectroscopic survey of candidate T subdwarfs identified by the Backyard Worlds: Planet 9 program. Near-infrared spectra of 31 sources with red $J - W 2$ co…

Discovery of 118 New Ultracool Dwarf Candidates Using Machine Learning Techniques

Hunter Brooks, Dan Caselden, J. Davy Kirkpatrick +44

We present the discovery of 118 new ultracool dwarf candidates, discovered using a new machine learning tool, named \texttt{SMDET}, applied to time series images from the Wide-fiel…

Eight New Substellar Hyades Candidates from the UKIRT Hemisphere Survey

Adam C. Schneider, Michael C. Cushing, Robert A. Stiller +16

We have used the UKIRT Hemisphere Survey (UHS) combined with the UKIDSS Galactic Cluster Survey (GCS), the UKIDSS Galactic Plane Survey (GPS), and the CatWISE2020 catalog to search…

Discovery of a Hypervelocity L Subdwarf at the Star/Brown Dwarf Mass Limit

Adam J. Burgasser, Roman Gerasimov, Kyle Kremer +18

We report the discovery of a high velocity, very low-mass star or brown dwarf whose kinematics suggest it is unbound to the Milky Way. CWISE J124909.08+362116.0 was identified by c…

Discovery of the Remarkably Red L/T Transition Object VHS J183135.58-551355.9

Thomas P. Bickle, Adam C. Schneider, Jonathan Gagné +15

We present the discovery of VHS J183135.58 $-$ 551355.9 (hereafter VHS J1831 $-$ 5513), an L/T transition dwarf identified as a result of its unusually red near-infrared colors ($J-K_{…