Long-term stellar activity variations and their effect on radial-velocity measurements
Author
dc.contributor.author
Costes, Jean C.
Author
dc.contributor.author
Watson, Christopher
Author
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de Mooij, Ernst
Author
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Saar, Steven H.
Author
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Dumusque, Xavier
Author
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Cameron, Collier
Author
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Phillips, David F.
Author
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Günther, Maximilian N.
Author
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Jenkins, James Stewart
Author
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Mortier, Annelies
Author
dc.contributor.author
Thompson, Andrew P. G.
Admission date
dc.date.accessioned
2022-01-10T21:30:51Z
Available date
dc.date.available
2022-01-10T21:30:51Z
Publication date
dc.date.issued
2021
Cita de ítem
dc.identifier.citation
MNRAS 505, 830–850 (2021)
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Identifier
dc.identifier.other
10.1093/mnras/stab1183
Identifier
dc.identifier.uri
https://repositorio.uchile.cl/handle/2250/183645
Abstract
dc.description.abstract
Long-term stellar activity variations can affect the detectability of long-period and Earth-analogue extrasolar planets. We have,
for 54 stars, analysed the long-term trend of five activity indicators: logR
HK, the cross-correlation function (CCF) bisector span,
CCF full-width-at-half-maximum, CCF contrast, and the area of the Gaussian fit to the CCF; and studied their correlation with
the RVs. The sign of the correlations appears to vary as a function of stellar spectral type, and the transition in sign signals
a noteworthy change in the stellar activity properties where earlier type stars appear more plage dominated. These transitions
become more clearly defined when considered as a function of the convective zone depth. Therefore, it is the convective zone
depth (which can be altered by stellar metallicity) that appears to be the underlying fundamental parameter driving the observed
activity correlations. In addition, for most of the stars, we find that the RVs become increasingly redshifted as activity levels
increase, which can be explained by the increase in the suppression of convective blueshift. However, we also find a minority
of stars where the RVs become increasingly blueshifted as activity levels increase. Finally, using the correlation found between
activity indicators and RVs, we removed RV signals generated by long-term changes in stellar activity. We find that performing
simple cleaning of such long-term signals enables improved planet detection at longer orbital periods.
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Patrocinador
dc.description.sponsorship
Kavli Institute
MIT's Kavli Institute
Comision Nacional de Investigacion Cientifica y Tecnologica (CONICYT)
CONICYT FONDECYT 1201371
CONICYT project Basal AFB-170002
UK Research & Innovation (UKRI)
Science & Technology Facilities Council (STFC)
Science and Technology Development Fund (STDF) ST/P000312/1
NASA Heliophysics LWS grant NNX16AB79G
National Aeronautics & Space Administration (NASA) NNX16AD42G
Smithsonian Institution
STFC consolidated grant ST/R000824/1
Branco-Weiss Fellowship-Society in Science
European Research Council (ERC) 851555
Prodex Program of the Swiss Space Office (SSO)
Harvard University Origins of Life Initiative (HUOLI)
Scottish Universities Physics Alliance (SUPA)
University of Geneva
Istituto Nazionale Astrofisica (INAF)
Queen's University Belfast
University of Edinburgh
International Space Science Institute (ISSI, Bern)
Comision Nacional de Investigacion Cientifica y Tecnologica (CONICYT)
CONICYT FONDECYT 1201371
Comision Nacional de Investigacion Cientifica y Tecnologica (CONICYT) AFB-170002
UK Research & Innovation (UKRI)
Science & Technology Facilities Council (STFC)
Smithsonian Astrophysical Observatory (SAO)
University of St Andrews
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Lenguage
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en
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Publisher
dc.publisher
Oxford Univ Press, England
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Type of license
dc.rights
Attribution-NonCommercial-NoDerivs 3.0 United States