Image Details
Caption: Figure 3.
Top: each color represents a separate noiseless synthetic SPIRou observation along with its corresponding upsampled (spline interpolated) spectrum. For clarity, only three observations are shown. Middle: the upsampled spectra are BERV-registered to reduce the line shift to a fraction of their width. The template shown as the dashed black line is the median of 10 BERV-registered spectra. Bottom: discrepancies between the template and instrumentally broadened intrinsic spectrum, demonstrating that the template contains altered stellar features. We further plot the residuals between a BERV-shifted observation and the template interpolated to the same wavelength grid.
© 2025. The Author(s). Published by the American Astronomical Society.