# # Program information file # PROGRAM_ID 2022B062 PROGRAM_TITLE Discovery of an Exceptionally Short-Period Very Low Mass Binary PROGRAM_INV1 Chih-Chun Hsu PROGRAM_INV2 Adam Burgasser PROGRAM_INV3 Christopher Theissen PROGRAM_INV4 PROGRAM_INV5 PROGRAM_SCICAT stellar PROGRAM_ABSTRACT_BEG Short-period binary systems are essential benchmarks for measuring the fundamental properties of stars [masses and radii] as well as testing models of star formation and evolution. We have recently discovered that the M9 dwarf LP 413-53, a previously unexceptional candidate young brown dwarf, is a double-lined spectroscopic binary with an estimated orbital period of 1.24 days and potential separation less than 3 stellar radii. We request 3 sequential nights of spectroscopic monitoring observations with iSHELL to accurately measure the radial velocity curve of this exceptional system to determine the physical properties of its very low-mass stellar or substellar components, and to anchor forthcoming searches for eclipses in photometric lightcurves. PROGRAM_ABSTRACT_END