IRTF Data Archive Program Information

# # Program information file # 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