The spectral impact of magnetic activity on disc-integrated HARPS-N solar observations: exploring new activity indicators
| Autor: | Giuseppina Micela, S. H. Saar, Ronald L. Walsworth, Rosario Cosentino, Annelies Mortier, David F. Phillips, A. Collier Cameron, Xavier Dumusque, Suzanne Aigrain, David W. Latham, Samantha Thompson, E. J. W. de Mooij, Raphaëlle D. Haywood, Ennio Poretti, T. W. Milbourne, Alessandro Sozzetti, M. López-Morales, Heather M. Cegla, Adriano Ghedina, David Charbonneau, A. Thompson, Emilio Molinari, J. Costes, Christopher A. Watson |
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| Přispěvatelé: | Science & Technology Facilities Council, University of St Andrews. School of Physics and Astronomy, University of St Andrews. St Andrews Centre for Exoplanet Science, Mortier, Annelies [0000-0001-7254-4363], Apollo - University of Cambridge Repository |
| Rok vydání: | 2020 |
| Předmět: |
planets and satellites: detection
NDAS FOS: Physical sciences faculae [Sun] Sun: faculae plages plages 01 natural sciences 010309 optics Sun: activity techniques: radial velocities 0103 physical sciences QB Astronomy Astrophysics::Solar and Stellar Astrophysics activity [Sun] faculae plages [Sun] Instrumentation and Methods for Astrophysics (astro-ph.IM) 010303 astronomy & astrophysics QC Solar and Stellar Astrophysics (astro-ph.SR) QB Earth and Planetary Astrophysics (astro-ph.EP) Physics radial velocities [Techniques] Astronomy Astronomy and Astrophysics detection [Planets and satellites] QC Physics Astrophysics - Solar and Stellar Astrophysics Space and Planetary Science Astrophysics::Earth and Planetary Astrophysics Astrophysics - Instrumentation and Methods for Astrophysics Astrophysics - Earth and Planetary Astrophysics |
| Zdroj: | Monthly Notices of the Royal Astronomical Society Thompson, A P G, Watson, C A, Haywood, R D, Costes, J C, de Mooij, E, Collier Cameron, A, 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 disc-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 |
| ISSN: | 0035-8711 |
| DOI: | 10.1093/mnras/staa1010 |
| Popis: | 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. Comment: 13 pages, 10 figures, accepted for publication in the Monthly Notices of the Royal Astronomical Society |
| Databáze: | OpenAIRE |
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