NuAncestor: an artificial satellite-borne star for accurate frequency calibration of ground-based EPRV spectrographs

TL;DR

NuAncestor introduces a satellite-based optical frequency comb system to provide absolute and stable wavelength calibration for ground-based high-precision spectrographs, enhancing the accuracy of radial velocity measurements.

Contribution

The paper proposes a novel satellite-borne calibration source using an optical frequency comb for universal, absolute calibration of EPRV spectrographs, addressing current local calibration limitations.

Findings

Conceptual design of satellite-based calibration system.

Potential for universal, absolute wavelength calibration.

Improved calibration stability and accuracy.

Abstract

The accuracy of state-of-the-art Extreme Precision Radial Velocity (EPRV) spectrographs depends on the access to extremely precise and stable wavelength calibration sources. There are several available calibration sources (e.g., emission lamps, laser frequency combs, reference cavities) that can be used to calibrate an astronomical spectrograph. However, the calibration as it is currently performed is always 'local'. In the proposed talk we will present the NuAncestor concept that proposes an accurate (absolute) and common wavelength calibration for astronomical high-resolution, high-precision spectrographs by embarking an optical frequency comb on-board a satellite equipped with an actively pointing telescope and precision orbitography. This calibration satellite shall be available and serve EPRV spectrographs in all major observatories around the world.