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dc.contributor.authorMoore, Keavin
dc.contributor.authorScholz, Aleks
dc.contributor.authorJayawardhana, Ray
dc.date.accessioned2019-03-05T16:30:12Z
dc.date.available2019-03-05T16:30:12Z
dc.date.issued2019-02-20
dc.identifier258058535
dc.identifierf268b083-83e5-4956-8e02-124ef436a298
dc.identifier000459323800012
dc.identifier85063450893
dc.identifier000459323800012
dc.identifier.citationMoore , K , Scholz , A & Jayawardhana , R 2019 , ' The rotation-disk connection in young brown dwarfs : strong evidence for early rotational braking ' , Astrophysical Journal , vol. 872 , no. 2 , 159 . https://doi.org/10.3847/1538-4357/aaff5cen
dc.identifier.issn0004-637X
dc.identifier.otherBibCode: 2019ApJ...872..159M
dc.identifier.urihttps://hdl.handle.net/10023/17222
dc.descriptionThis work was supported in part by a McGill University Tomlinson Doctoral fellowship to K.M., NSERC grant to R.J. and by STFC grant ST/R000824/1 to A.S.en
dc.description.abstractWe use Kepler/K2 light curves to measure rotation periods of brown dwarfs and very low mass stars in the Upper Scorpius star-forming region. Our sample comprises a total of 104 periods. Depending on the assumed age of Upper Scorpius, about a third of them are for brown dwarfs. The median period is 1.28 day for the full sample and 0.84 day for the probable brown dwarfs. With this period sample, we find compelling evidence for early rotational braking in brown dwarfs, caused by the interaction between the central object and the disk. The median period for objects with disks is at least 50% longer than for those without. Two brown dwarfs show direct signs of "disk-locking" in their light curves, in the form of dips that recur on a timescale similar to the rotation period. Comparing the period samples for brown dwarfs at different ages, there is a clear need to include rotational braking into period evolution tracks between 1 and 10 Myr. A locked period over several Myr followed by spin-up due to contraction fits the observational data. We conclude that young brown dwarfs are affected by the same rotational regulation as stars, though they start off with significantly faster rotation, presumably set by initial conditions.
dc.format.extent20
dc.format.extent4493960
dc.language.isoeng
dc.relation.ispartofAstrophysical Journalen
dc.subjectAccretion, accretion disksen
dc.subjectBrown dwarfsen
dc.subjectStars: formationen
dc.subjectStars: rotationen
dc.subjectQB Astronomyen
dc.subject3rd-DASen
dc.subject.lccQBen
dc.titleThe rotation-disk connection in young brown dwarfs : strong evidence for early rotational brakingen
dc.typeJournal articleen
dc.contributor.sponsorScience & Technology Facilities Councilen
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.identifier.doi10.3847/1538-4357/aaff5c
dc.description.statusPeer revieweden
dc.identifier.urlhttps://arxiv.org/abs/1901.05523en
dc.identifier.urlhttp://adsabs.harvard.edu/abs/2019ApJ...872..159Men
dc.identifier.grantnumberST/R00824/1en
dc.identifier.grantnumberST/M001296/1en


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