Long-term stellar activity variations and their effect on radial-velocity measurements. Costes, J. C., Watson, C. A., de Mooij, E., Saar, S. H., Dumusque, X., Cameron, A. C., Phillips, D. F., Günther, M. N., Jenkins, J. S., Mortier, A., & Thompson, A. P. G. 2021. cite arxiv:2105.01915Comment: 22 pages, 9 figures, accepted for publication in the Monthly Notices of the Royal Astronomical Society![Long-term stellar activity variations and their effect on radial-velocity measurements [link]](https://bibbase.org/img/filetypes/link.svg "link")
Paper doi abstract bibtex 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: log$R'_\mathrm{{HK}}$, 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 red-shifted as activity levels increase, which can be explained by the increase in the suppression of convective blue-shift. However, we also find a minority of stars where the RVs become increasingly blue-shifted 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.
@misc{costes2021longterm,
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:
log$R'_\mathrm{{HK}}$, 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 red-shifted as activity
levels increase, which can be explained by the increase in the suppression of
convective blue-shift. However, we also find a minority of stars where the RVs
become increasingly blue-shifted 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.},
added-at = {2021-05-10T15:46:47.000+0200},
author = {Costes, Jean C. and Watson, Christopher A. and de Mooij, Ernst and Saar, Steven H. and Dumusque, Xavier and Cameron, Andrew Collier and Phillips, David F. and Günther, Maximilian N. and Jenkins, James S. and Mortier, Annelies and Thompson, Andrew P. G.},
biburl = {https://www.bibsonomy.org/bibtex/212a1e1770ba7aee08d81fb01e02feebb/superjenwinters},
description = {Long-term stellar activity variations and their effect on radial-velocity measurements},
doi = {10.1093/mnras/stab1183},
interhash = {7e3c3401eb0cd3c5ba7000ecf4754561},
intrahash = {12a1e1770ba7aee08d81fb01e02feebb},
keywords = {activity RVs},
note = {cite arxiv:2105.01915Comment: 22 pages, 9 figures, accepted for publication in the Monthly Notices of the Royal Astronomical Society},
timestamp = {2021-05-10T15:46:47.000+0200},
title = {Long-term stellar activity variations and their effect on
radial-velocity measurements},
url = {http://arxiv.org/abs/2105.01915},
year = 2021
}
Downloads: 0
{"_id":"mEHahZjkWxBB8HYqr","bibbaseid":"costes-watson-demooij-saar-dumusque-cameron-phillips-gnther-etal-longtermstellaractivityvariationsandtheireffectonradialvelocitymeasurements-2021","author_short":["Costes, J. C.","Watson, C. A.","de Mooij, E.","Saar, S. H.","Dumusque, X.","Cameron, A. C.","Phillips, D. F.","Günther, M. N.","Jenkins, J. S.","Mortier, A.","Thompson, A. P. G."],"bibdata":{"bibtype":"misc","type":"misc","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: log$R'_\\mathrm{{HK}}$, 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 red-shifted as activity levels increase, which can be explained by the increase in the suppression of convective blue-shift. However, we also find a minority of stars where the RVs become increasingly blue-shifted 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.","added-at":"2021-05-10T15:46:47.000+0200","author":[{"propositions":[],"lastnames":["Costes"],"firstnames":["Jean","C."],"suffixes":[]},{"propositions":[],"lastnames":["Watson"],"firstnames":["Christopher","A."],"suffixes":[]},{"propositions":["de"],"lastnames":["Mooij"],"firstnames":["Ernst"],"suffixes":[]},{"propositions":[],"lastnames":["Saar"],"firstnames":["Steven","H."],"suffixes":[]},{"propositions":[],"lastnames":["Dumusque"],"firstnames":["Xavier"],"suffixes":[]},{"propositions":[],"lastnames":["Cameron"],"firstnames":["Andrew","Collier"],"suffixes":[]},{"propositions":[],"lastnames":["Phillips"],"firstnames":["David","F."],"suffixes":[]},{"propositions":[],"lastnames":["Günther"],"firstnames":["Maximilian","N."],"suffixes":[]},{"propositions":[],"lastnames":["Jenkins"],"firstnames":["James","S."],"suffixes":[]},{"propositions":[],"lastnames":["Mortier"],"firstnames":["Annelies"],"suffixes":[]},{"propositions":[],"lastnames":["Thompson"],"firstnames":["Andrew","P.","G."],"suffixes":[]}],"biburl":"https://www.bibsonomy.org/bibtex/212a1e1770ba7aee08d81fb01e02feebb/superjenwinters","description":"Long-term stellar activity variations and their effect on radial-velocity measurements","doi":"10.1093/mnras/stab1183","interhash":"7e3c3401eb0cd3c5ba7000ecf4754561","intrahash":"12a1e1770ba7aee08d81fb01e02feebb","keywords":"activity RVs","note":"cite arxiv:2105.01915Comment: 22 pages, 9 figures, accepted for publication in the Monthly Notices of the Royal Astronomical Society","timestamp":"2021-05-10T15:46:47.000+0200","title":"Long-term stellar activity variations and their effect on radial-velocity measurements","url":"http://arxiv.org/abs/2105.01915","year":"2021","bibtex":"@misc{costes2021longterm,\n abstract = {Long-term stellar activity variations can affect the detectability of\r\nlong-period and Earth-analogue extrasolar planets. We have, for 54 stars,\r\nanalysed the long-term trend of five activity indicators:\r\nlog$R'_\\mathrm{{HK}}$, the cross-correlation function (CCF) bisector span, CCF\r\nfull-width-at-half-maximum, CCF contrast, and the area of the Gaussian fit to\r\nthe CCF; and studied their correlation with the RVs. The sign of the\r\ncorrelations appears to vary as a function of stellar spectral type, and the\r\ntransition in sign signals a noteworthy change in the stellar activity\r\nproperties where earlier type stars appear more plage dominated. These\r\ntransitions become more clearly defined when considered as a function of the\r\nconvective zone depth. Therefore, it is the convective zone depth (which can be\r\naltered by stellar metallicity) that appears to be the underlying fundamental\r\nparameter driving the observed activity correlations. In addition, for most of\r\nthe stars, we find that the RVs become increasingly red-shifted as activity\r\nlevels increase, which can be explained by the increase in the suppression of\r\nconvective blue-shift. However, we also find a minority of stars where the RVs\r\nbecome increasingly blue-shifted as activity levels increase. Finally, using\r\nthe correlation found between activity indicators and RVs, we removed RV\r\nsignals generated by long-term changes in stellar activity. We find that\r\nperforming simple cleaning of such long-term signals enables improved planet\r\ndetection at longer orbital periods.},\n added-at = {2021-05-10T15:46:47.000+0200},\n author = {Costes, Jean C. and Watson, Christopher A. and de Mooij, Ernst and Saar, Steven H. and Dumusque, Xavier and Cameron, Andrew Collier and Phillips, David F. and Günther, Maximilian N. and Jenkins, James S. and Mortier, Annelies and Thompson, Andrew P. G.},\n biburl = {https://www.bibsonomy.org/bibtex/212a1e1770ba7aee08d81fb01e02feebb/superjenwinters},\n description = {Long-term stellar activity variations and their effect on radial-velocity measurements},\n doi = {10.1093/mnras/stab1183},\n interhash = {7e3c3401eb0cd3c5ba7000ecf4754561},\n intrahash = {12a1e1770ba7aee08d81fb01e02feebb},\n keywords = {activity RVs},\n note = {cite arxiv:2105.01915Comment: 22 pages, 9 figures, accepted for publication in the Monthly Notices of the Royal Astronomical Society},\n timestamp = {2021-05-10T15:46:47.000+0200},\n title = {Long-term stellar activity variations and their effect on\r\n radial-velocity measurements},\n url = {http://arxiv.org/abs/2105.01915},\n year = 2021\n}\n\n","author_short":["Costes, J. C.","Watson, C. A.","de Mooij, E.","Saar, S. H.","Dumusque, X.","Cameron, A. C.","Phillips, D. F.","Günther, M. N.","Jenkins, J. S.","Mortier, A.","Thompson, A. P. G."],"key":"costes2021longterm","id":"costes2021longterm","bibbaseid":"costes-watson-demooij-saar-dumusque-cameron-phillips-gnther-etal-longtermstellaractivityvariationsandtheireffectonradialvelocitymeasurements-2021","role":"author","urls":{"Paper":"http://arxiv.org/abs/2105.01915"},"keyword":["activity RVs"],"metadata":{"authorlinks":{}}},"bibtype":"misc","biburl":"http://www.bibsonomy.org/bib/author/james?items=1000","dataSources":["xpeFGiChAit2LNnty"],"keywords":["activity rvs"],"search_terms":["long","term","stellar","activity","variations","effect","radial","velocity","measurements","costes","watson","de mooij","saar","dumusque","cameron","phillips","günther","jenkins","mortier","thompson"],"title":"Long-term stellar activity variations and their effect on radial-velocity measurements","year":2021}