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dc.contributor.authorHitchcock, J. A.
dc.contributor.authorHelling, Ch
dc.contributor.authorScholz, A.
dc.contributor.authorHodosan, G.
dc.contributor.authorDominik, M.
dc.contributor.authorHundertmark, M.
dc.contributor.authorJørgensen, U. G.
dc.contributor.authorLonga-Peña, P.
dc.contributor.authorSajadian, S.
dc.contributor.authorSkottfelt, J.
dc.contributor.authorSnodgrass, C.
dc.contributor.authorBozza, V.
dc.contributor.authorBurgdorf, M. J.
dc.contributor.authorCampbell-White, J.
dc.contributor.authorFiguera Jaimes, Roberto
dc.contributor.authorFujii, Y. I.
dc.contributor.authorHaikala, L. K.
dc.contributor.authorHenning, T.
dc.contributor.authorHinse, T. C.
dc.contributor.authorLowry, S.
dc.contributor.authorMancini, L.
dc.contributor.authorRahvar, S.
dc.contributor.authorRabus, M.
dc.contributor.authorSouthworth, J.
dc.contributor.authorvon Essen, C.
dc.identifier.citationHitchcock , J A , Helling , C , Scholz , A , Hodosan , G , Dominik , M , Hundertmark , M , Jørgensen , U G , Longa-Peña , P , Sajadian , S , Skottfelt , J , Snodgrass , C , Bozza , V , Burgdorf , M J , Campbell-White , J , Figuera Jaimes , R , Fujii , Y I , Haikala , L K , Henning , T , Hinse , T C , Lowry , S , Mancini , L , Rahvar , S , Rabus , M , Southworth , J & von Essen , C 2020 , ' Large-scale changes of the cloud coverage in the ɛ Indi Ba,Bb system ' , Monthly Notices of the Royal Astronomical Society , vol. 495 , no. 4 , pp. 3881-3999 .
dc.identifier.otherBibCode: 2020MNRAS.tmp.1494H
dc.identifier.otherORCID: /0000-0002-3202-0343/work/75996678
dc.descriptionFunding: LM acknowledges support from the University of Rome Tor Vergata through ‘Mission: Sustainability 2017’ fund. ChH and GH gratefully acknowledge the support of the European Research Council (ERC) Starting Grant no. 257431.en
dc.description.abstractWe present the results of 14 nights of I-band photometric monitoring ofthe nearby brown dwarf binary, ɛ Indi Ba,Bb. Observations were acquired over 2 months, and total close to 42 hours of coverage at a typically high cadence of 1.4 minutes. At a separation of just 0.7″, we do not resolve the individual components, and so effectively treat the binary as if it were a single object. However, ɛ Indi Ba (spectral type T1) is the brightest known T-type brown dwarf, and is expected to dominate the photometric signal. We typically find no strong variability associated with the target during each individual night of observing, but see significant changes in mean brightness - by as much as 0.10 magnitudes - over the 2 months of the campaign. This strong variation is apparent on a timescale of at least 2 days. We detect no clear periodic signature, which suggests we may be observing the T1 brown dwarf almost pole-on, and the days-long variability in mean brightness is caused by changes in the large-scale structure of the cloud coverage. Dynamic clouds will very likely produce lightning, and complementary high cadence V-band and Hα images were acquired to search for the emission signatures associated with stochastic 'strikes'. We report no positive detections for the target in either of these passbands.
dc.relation.ispartofMonthly Notices of the Royal Astronomical Societyen
dc.subjectTechniques: photometricen
dc.subjectBrown dwarfsen
dc.subjectStars: individual: ɛ Indi Ba and Bben
dc.subjectQB Astronomyen
dc.subjectQC Physicsen
dc.titleLarge-scale changes of the cloud coverage in the ɛ Indi Ba,Bb systemen
dc.typeJournal articleen
dc.contributor.sponsorEuropean Research 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
dc.identifier.grantnumber257431 257431en

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