Relative radial velocities for Sanders 364 from the Tillinghast Reflector Echelle Spectrograph (TRES)

We observed Sanders 364 with the Tillinghast Reflector Echelle Spectrograph 407 times between UT 2011-Feb-22 and 2022-May-16. TRES is a fiber-fed instrument mounted on the 1.5 m Tillinghast Reflector at the Fred Lawrence Whipple Observatory on Mount Hopkins, Arizona. The first two observations were taken as part of a long-running survey for binaries in M67, and the remaining 405 spectra were acquired with denser sampling starting in 2016, with the goal of better characterizing the planetary system orbiting S364. Typical exposure times were 10 to 15 minutes, yielding signal-to-noise ratios (SNR) most often between 40 and 80 per resolution element. We obtained Thorium-Argon emission-line spectra before and after the science exposures for wavelength calibration. We optimally extracted the spectra and derived RVs according to the procedures outlined in Buchhave et al. (2010), with the exception that we use the high-SNR median observed spectrum as the template for cross-correlation, and we account for drifts in the instrument zero point through nightly monitoring of RV standard stars. The mean uncertainty of our derived velocities is 15 ms-1. 

The first column in the file is the time of observation recorded in Barycentric Julian Date (BJD). The second column is the relative radial velocity in ms-1. The third column is the uncertainty associated with the derived radial velocity in ms-1.