Please use this identifier to cite or link to this item:
http://hdl.handle.net/20.500.12386/29206
Title: | Reducing activity-induced variations in a radial-velocity time series of the Sun as a star | Authors: | LANZA, Antonino Francesco Collier Cameron, A. Haywood, R. D. |
Issue Date: | 2019 | Journal: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Number: | 486 | Issue: | 3 | First Page: | 3459 | Abstract: | The radial velocity (RV) of the Sun as a star is affected by its surface convection and magnetic activity. The moments of the cross-correlation function between the solar spectrum and a binary line mask contain information about the stellar RV and line-profile distortions caused by stellar activity. As additional indicators, we consider the disc-averaged magnetic flux and the filling factor of the magnetic regions. Here we show that the activity-induced radial-velocity fluctuations are reduced when we apply a kernel regression to these activity indicators. The disc-averaged magnetic flux proves to be the best activity proxy over a time-scale of one month and gives a standard deviation of the regression residuals of 1.04 m/s, more than a factor of 2.8 smaller than the standard deviation of the original RV fluctuations. This result has been achieved thanks to the high-cadence and time continuity of the observations that simultaneously sample both the RV and the activity proxies. | URI: | http://hdl.handle.net/20.500.12386/29206 | URL: | https://academic.oup.com/mnras/article/486/3/3459/5454757 | ISSN: | 0035-8711 | DOI: | 10.1093/mnras/stz1055 | Bibcode ADS: | 2019MNRAS.486.3459L | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
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File | Description | Size | Format | |
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LanzaCameronHaywood19.pdf | pdf editoriale | 438.85 kB | Adobe PDF | View/Open |
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