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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 6.

Top: the normalized interpolation error, represented by the term in square brackets in Equation (5), is plotted against the spectral quality factor and follows a second-order polynomial shown by the black line. Diamonds indicate various spectra, with the positions of example M4, M6, M8, and M9 stars highlighted. Bottom: this provides the RV uncertainty floor due to interpolation error for a given spectral type and sampling resolution. RMSE in RV estimates for where S/N is 1000 per 1 km s−1 domain across sampling resolutions and spectral types. Dashed lines show RV precision using the intrinsic spectrum. Template-based estimates are limited to ∼0.5 m s−1 for SPIRou. A fourth-order polynomial fit captures template-based interpolation error.

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