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dc.contributor.authorBiddle, Lauren I.
dc.contributor.authorLlama, Joe
dc.contributor.authorCameron, Andrew
dc.contributor.authorPrato, L.
dc.contributor.authorJardine, Moira
dc.contributor.authorJohns-Krull, Christopher M.
dc.identifier.citationBiddle , L I , Llama , J , Cameron , A , Prato , L , Jardine , M & Johns-Krull , C M 2021 , ' Amplitude modulation of short-timescale hot spot variability ' , Astrophysical Journal , vol. 906 , no. 2 , 113 .
dc.identifier.otherPURE: 272845478
dc.identifier.otherPURE UUID: 70ce7461-98ba-4498-8992-a410e4f9e4a9
dc.identifier.otherScopus: 85100120756
dc.identifier.otherORCID: /0000-0002-8863-7828/work/88730775
dc.identifier.otherORCID: /0000-0002-1466-5236/work/88730888
dc.identifier.otherWOS: 000607748600001
dc.descriptionFunding Information: L.I.B., L.A.P., and J.L. acknowledge support from NASA through an Astrophysics Data Analysis Program grant to Lowell Observatory (grant 80NSSC20K1001). A.C.C. and M.M.J. acknowledge support from the Science and Technology Facilities Council (STFC) consolidated grant No. ST/R00824/1, and the support of the visiting scientist program at Lowell Observatory in 2019 January and 2020 January. Data were obtained using the Mikulski Archive for Space Telescopes (MAST). STScI is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS5-26555.en
dc.description.abstractVariability of Classical T Tauri stars (CTTS) occurs over a vast range of timescales. CTTS in particular are subject to variability caused by accretion shocks, which can occur stochastically, periodically, or quasi-periodically on timescales over a few days. The detectability of young planets within these systems is likely hampered by activity; therefore, it is essential that we understand the origin of young star variability over a range of timescales to help disentangle stellar activity from signatures of planetary origin. We present an analysis of the stochastic small-amplitude photometric variability in the K2 lightcurve of CI Tau occurring on timescales of ≲1 day. We find the amplitude of this variability exhibits the same periodic signatures as detected in the large-amplitude variability, indicating that the physical mechanism modulating these brightness features is the same. The periods detected are also in agreement with the rotation period of the star (∼6.6 days) and the orbital period of the planet (∼9.0 days) known to drive pulsed accretion onto the star.
dc.relation.ispartofAstrophysical Journalen
dc.rightsCopyright © 2021. The American Astronomical Society. All rights reserved. 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 author created accepted manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at
dc.subjectQB Astronomyen
dc.subjectQC Physicsen
dc.subjectSpace and Planetary Scienceen
dc.subjectAstronomy and Astrophysicsen
dc.titleAmplitude modulation of short-timescale hot spot variabilityen
dc.typeJournal articleen
dc.contributor.sponsorScience & Technology Facilities Councilen
dc.contributor.institutionUniversity of St Andrews. School of Physics and Astronomyen
dc.contributor.institutionUniversity of St Andrews. St Andrews Centre for Exoplanet Scienceen
dc.description.statusPeer revieweden

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