Скачать или смотреть Eric B. Ford: Characterizing granulation via GPs modeling of NEID solar spectra

The NEID spectrograph routinely collects ~250 high-resolution solar spectra per clear day to support research in mitigating the effects of stellar variability on RV surveys. NEID is complementary to other spectrographs taking Sun-as-a-star observations thanks to the combination of its instrumental precision and stability, large spectral grasp, and high cadence of solar observations. I propose to present early results to characterize the effects of granulation on RV measurements based on applying GP regression models to NEID solar observations. We employ physically-motivated GP kernels that account for pulsations and granulation ((Guo et al. submitted), short-lived active regions (Gilbertson et al. 2020) and finite exposure time effects (Luhn et al. submitted). Depending on progress, we may report additional characteristics (e.g., chromatic effects). The goals include stimulating ideas for further improvements in the GP model and discussing implications for the observing cadence of upcoming RV surveys.