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The Tillinghast Reflector Echelle Spectrograph (TRES) is a fiber-fed optical spectrograph with a resolution of 44,000. TRES is a workhorse for recon spectroscopy as part of the TESS Follow-up Observing Program (TFOP). To date, over 4000 spectra of over 1700 TOIs have been obtained with TRES. In addition, over 200 TOIs have been observed with the Fiber-fed Echelle Spectrograph (FIES). These spectra are carefully examined to search for possible false positives such as double-lined spectra or targets that show large velocity variation indicating a stellar companion. The spectra are also used to derive stellar parameters using the Stellar Parameter Classification (SPC) tool. Extracted spectra along with quick-look stellar classification plots from the TRES pipeline are uploaded to ExoFOP weekly to encourage community collaboration. A full SPC analysis is able to provide effective temperature, surface gravity, projected rotational velocity and metallicity. A quality flag indicator has also been applied to the classifications based on the quality of the data and the stellar type/parameters. These parameters are be uploaded to ExoFOP on a monthly basis. TRES absolute radial velocities are determined by applying a standard star correction and a correction based on observations of the monitoring of minor planets. Absolute velocities are available by request and will be uploaded to ExoFOP soon!
exoplanets, TESS, TRES, SPC, stellar parameters, radial velocities
exoplanets, TESS, TRES, SPC, stellar parameters, radial velocities
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