Estimating Magnetic Filling Factors from Simultaneous Spectroscopy and Photometry: Disentangling Spots, Plage, and Network

@article{Milbourne2021EstimatingMF,
  title={Estimating Magnetic Filling Factors from Simultaneous Spectroscopy and Photometry: Disentangling Spots, Plage, and Network},
  author={T. W. Milbourne and David F. Phillips and Nicholas Langellier and A. Mortier and Rapha{\"e}lle D. Haywood and Steven H. Saar and Heather M Cegla and A. Collier Cameron and Xavier Dumusque and David W. Latham and Luca Malavolta and J. Maldonado and S. Thompson and Andrew Vanderburg and Christopher A. Watson and Lars A. Buchhave and M. Cecconi and Rosario Cosentino and Adriano Ghedina and M. Gonzalez and Marcello Lodi and Mercedes L'opez-Morales and Alessandro Sozzetti and Ronald L. Walsworth},
  journal={The Astrophysical Journal},
  year={2021},
  volume={920}
}
State-of-the-art radial velocity (RV) exoplanet searches are limited by the effects of stellar magnetic activity. Magnetically active spots, plage, and network regions each have different impacts on the observed spectral lines and therefore on the apparent stellar RV. Differentiating the relative coverage, or filling factors, of these active regions is thus necessary to differentiate between activity-driven RV signatures and Doppler shifts due to planetary orbits. In this work, we develop a… 

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