Stellar Parameter Classification of TESS recon spectra from TRES and FIES

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 2500 spectra of over 1000 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-TESS weekly to encourage community collaboration. A full SPC analysis of all TRES and FIES spectra is being run to provide effective temperature, surface gravity, projected rotational velocity and metallicity. A quality flag indicator will also be applied to the classifications based on the quality of the data and the stellar type/parameters. These parameters will be uploaded to ExoFOP-TESS once the analysis is complete for community use.