IRTF Data Archive Program Information

# # Program information file # PROGRAM_ID 2021A071 PROGRAM_TITLE Hidden Binaries in Beta Pictoris Moving Group PROGRAM_INV1 Eric Gaidos PROGRAM_INV2 Rena Lee PROGRAM_INV3 PROGRAM_INV4 PROGRAM_INV5 PROGRAM_SCICAT stellar PROGRAM_ABSTRACT_BEG We propose to obtain high-resolution infrared spectra of M dwarfs in the 22 Myr-old Beta Pictoris Moving Group to identify previously undetected spectroscopic binaries [single- or double-lined]. BPMG stars are an important benchmark for understanding the rotational evolution of M dwarfs on the pre-main sequence, including in regards to the effects of stellar multiplicity. Information on multiplicity is important for understanding the distribution of M dwarf rotation on the zero-age main sequence and the establishment of a practical M dwarf gychronology, perhaps the only viable method of accurate age determination for these, the most numerous stars, and important planet hosts. We will search for double-lined binaries among 74 systems in a set of K-band spectra obtained over two semesters, and propose for second-epoch observations to identify single-lined systems in a subsequent year. Our RV precision using the methane isotopologue gas cell will be sufficient to identify any companions down to the hydrogen-burning limit to separations of a few AU, where high-resolution AO imaging provides coverage. Our spectra will also comprise a atlas for future work on young M dwarf stellar atmospheres, metallicities, and magnetic activity. PROGRAM_ABSTRACT_END