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# Program information file
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PROGRAM_ID           2023A003
PROGRAM_TITLE        Spectroscopy of 20 Myr-old Stars with Circumstellar Disks
PROGRAM_INV1         Kevin Luhman
PROGRAM_INV2          
PROGRAM_INV3          
PROGRAM_INV4          
PROGRAM_INV5          
PROGRAM_SCICAT       galactic/interstellar medium
PROGRAM_ABSTRACT_BEG
A recent study has used high-precision astrometry and photometry from Gaia and mid-IR photometry from WISE to identify ~500 likely members of the Sco-Cen complex that have ages of 20 Myr and that exhibit evidence of circumstellar disks. These sources comprise the largest available sample [by far] of primordial disks at an age beyond 10 Myr, and thus are valuable targets for studies of the evolution of primordial disks and the formation of giant planets, particularly with ALMA. However, most of these stars lacked the spectroscopy needed for spectral classifications and confirmation of youth. We have recently begun spectroscopy of those stars with the IRTF and other facilities, using SpeX for stars that are observable from Mauna Kea and that have photometry indicative of low-mass stars and brown dwarfs. We propose to use SpeX to observe the remaining targets of that kind.
PROGRAM_ABSTRACT_END