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• W2743809634 abstract "Photospheric velocities and stellar activity features such as spots and faculae produce measurable radial velocity signals that currently obscure the detection of sub-meter-per-second planetary signals. However, photospheric velocities are imprinted differently in a high-resolution spectrum than Keplerian Doppler shifts. Photospheric activity produces subtle differences in the shapes of absorption lines due to differences in how temperature or pressure affects the atomic transitions. In contrast, Keplerian Doppler shifts affect every spectral line in the same way. With high enough S/N and high enough resolution, statistical techniques can exploit differences in spectra to disentangle the photospheric velocities and detect lower-amplitude exoplanet signals. We use simulated disk-integrated time-series spectra and principal component analysis (PCA) to show that photospheric signals introduce spectral line variability that is distinct from Doppler shifts. We quantify the impact of instrumental resolution and S/N for this work." @default.
• W2743809634 created "2017-08-17" @default.
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• W2743809634 date "2017-08-31" @default.
• W2743809634 modified "2023-10-18" @default.
• W2743809634 title "Insights on the Spectral Signatures of Stellar Activity and Planets from PCA" @default.
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• W2743809634 doi "https://doi.org/10.3847/1538-4357/aa8303" @default.
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