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The Interpolation Constraint in the RV Analysis of M Dwarfs Using Empirical Templates

  • Authors: Dhvani Doshi, Nicolas B. Cowan, Étienne Artigau, René Doyon, André M. Silva, Khaled Al Moulla, Yashar Hezaveh

Dhvani Doshi et al 2025 The Astronomical Journal 170 .

  • Provider: AAS Journals

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.

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