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Frequency-comb-calibrated Laser Heterodyne Radiometry for Precision Radial Velocity Measurements.

Ryan K Cole1,2, Connor Fredrick1,3, Winter Parts4,5

  • 1Time and Frequency Division, National Institute of Standards and Technology, Boulder, CO 80305, USA; rcole@bates.edu, scott.diddams@colorado.edu.

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Summary
This summary is machine-generated.

Researchers developed a new method for disk-integrated solar spectroscopy using a laser heterodyne radiometer (LHR) and optical frequency comb calibration. This approach achieves sub-meter-per-second radial velocity precision, crucial for studying stellar activity.

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Area of Science:

  • Solar Physics
  • Stellar Activity
  • Spectroscopy

Background:

  • Disk-integrated solar observations offer unique insights into stellar activity.
  • Radial velocity measurements are key to understanding stellar behavior and exoplanet detection.
  • Existing methods face challenges in precision and accuracy.

Purpose of the Study:

  • To introduce and evaluate a novel approach for disk-integrated solar spectroscopy.
  • To assess the capabilities of this new method for precise solar radial velocity measurements.
  • To quantify uncertainty sources impacting radial velocity measurements.

Main Methods:

  • Utilized a near-infrared laser heterodyne radiometer (LHR) coupled with optical frequency comb calibration.
  • Recorded solar spectra of the Fe I 1565 nm transition over a six-week period.
  • Employed daily measurements of the absolute line center for stability assessment.

Main Results:

  • Achieved high spectral resolution (∼800,000) and signal-to-noise ratio (∼2600).
  • Demonstrated sub-meter-per-second radial velocity precision within a single day.
  • Quantified principal uncertainty sources affecting radial velocity measurements.

Conclusions:

  • The comb-calibrated LHR approach enables precision disk-integrated solar spectroscopy.
  • This method offers high absolute frequency accuracy and long-term stability.
  • Future modifications can further enhance its utility for stellar variability studies.