IRTF Data Archive Program Information

# # Program information file # PROGRAM_ID 2021B026 PROGRAM_TITLE Probing the Low-Mass, Substellar Population of the Benchmark Hyades Cluster PROGRAM_INV1 Adam Schneider PROGRAM_INV2 Scott Dahm PROGRAM_INV3 Frederick Vrba PROGRAM_INV4 Jeffrey Munn PROGRAM_INV5 Justice Bruursema PROGRAM_SCICAT stellar PROGRAM_ABSTRACT_BEG Substellar objects with known ages are invaluable touchstones for providing empirical constraints on low-mass evolutionary models. Brown dwarfs with precise ages, however, are rare because age diagnostics are not sufficient to give a precise age for single, free-floating objects. Therefore, brown dwarfs that can be tied to a known stellar association or cluster with a well-calibrated age provide unique laboratories for testing substellar models. We have used the UKIRT Hemisphere Survey [UHS] and CatWISE 2020 catalogs to search for previously unknown substellar members of the nearest open cluster to the Sun, the Hyades. We have found 15 candidate substellar Hyades members, and are proposing follow-up near-infrared spectroscopy with SpeX to determine each candidate's spectral type and physical properties. PROGRAM_ABSTRACT_END