The spectral impact of magnetic activity on disk-integrated HARPS-N solar observations : exploring new activity indicators
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Stellar activity is the major roadblock on the path to finding true Earth-analogue planets with the Doppler technique. Thus, identifying new indicators that better trace magnetic activity (i.e. faculae and spots) is crucial to aid in disentangling these signals from that of a planet's Doppler wobble. In this work, we investigate activity related features as seen in disk-integrated spectra from the HARPS-N solar telescope. We divide high-activity spectral echelle orders by low-activity master templates (as defined using both log R'HK and images from the Solar Dynamics Observatory, SDO), creating "relative spectra". With resolved images of the surface of the Sun (via SDO), the faculae and spot filling factors can be calculated, giving a measure of activity independent of, and in addition to, log R'HK. We find pseudo-emission (and pseudo-absorption) features in the relative spectra that are similar to those reported in our previous work on alpha Cen B. In alpha Cen B, the features are shown to correlate better to changes in faculae filling factor than spot filling factor. In this work we more confidently identify changes in faculae coverage of the visible hemisphere of the Sun as the source of features produced in the relative spectra. Finally, we produce trailed spectra to observe the RV component of the features, which show that the features move in a redward direction as one would expect when tracking active regions rotating on the surface of a star.
Thompson , A P G , Watson , C A , Haywood , R D , Costes , J C , de Mooij , E , Cameron , A C , Dumusque , X , Phillips , D F , Saar , S H , Mortier , A , Milbourne , T W , Aigrain , S , Cegla , H M , Charbonneau , D , Cosentino , R , Ghedina , A , Latham , D W , López-Morales , M , Micela , G , Molinari , E , Poretti , E , Sozzetti , A , Thompson , S & Walsworth , R 2020 , ' The spectral impact of magnetic activity on disk-integrated HARPS-N solar observations : exploring new activity indicators ' , Monthly Notices of the Royal Astronomical Society , vol. 494 , no. 3 , pp. 4279–4290 . https://doi.org/10.1093/mnras/staa1010
Monthly Notices of the Royal Astronomical Society
Copyright © 2020 the Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. This work has been made available online in accordance with publisher policies or with permission. Permission for further reuse of this content should be sought from the publisher or the rights holder. This is the final published version of the work, which was originally published at https://doi.org/10.1093/mnras/staa1010.