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dc.contributor.authorBiller, Beth A.
dc.contributor.authorVos, Johanna
dc.contributor.authorBonavita, Mariangela
dc.contributor.authorBuenzli, Esther
dc.contributor.authorBaxter, Claire
dc.contributor.authorCrossfield, Ian J. M.
dc.contributor.authorAllers, Katelyn
dc.contributor.authorLiu, Michael C.
dc.contributor.authorBonnefoy, Mickaël
dc.contributor.authorDeacon, Niall
dc.contributor.authorBrandner, Wolfgang
dc.contributor.authorSchlieder, Joshua E.
dc.contributor.authorDupuy, Trent
dc.contributor.authorKopytova, Taisiya
dc.contributor.authorManjavacas, Elena
dc.contributor.authorAllard, France
dc.contributor.authorHomeier, Derek
dc.contributor.authorHenning, Thomas
dc.date.accessioned2016-03-16T10:14:20Z
dc.date.available2016-03-16T10:14:20Z
dc.date.issued2015-11-10
dc.identifier.citationBiller , B A , Vos , J , Bonavita , M , Buenzli , E , Baxter , C , Crossfield , I J M , Allers , K , Liu , M C , Bonnefoy , M , Deacon , N , Brandner , W , Schlieder , J E , Dupuy , T , Kopytova , T , Manjavacas , E , Allard , F , Homeier , D & Henning , T 2015 , ' Variability in a young, L/T transition planetary-mass object ' , Astrophysical Journal Letters , vol. 813 , no. 2 , L23 . https://doi.org/10.1088/2041-8205/813/2/L23
dc.identifier.issn2041-8205
dc.identifier.otherPURE: 9642037
dc.identifier.otherPURE UUID: be111fd7-13de-4bc8-8386-2d7918e59307
dc.identifier.otherScopus: 84947063427
dc.identifier.urihttp://hdl.handle.net/2299/16786
dc.description.abstractAs part of our ongoing NTT SoFI survey for variability in young free-floating planets and low-mass brown dwarfs, we detect significant variability in the young, free-floating planetary-mass object PSO J318.5-22, likely due to rotational modulation of inhomogeneous cloud cover. A member of the 23 ± 3 Myr β Pic moving group, PSO J318.5-22 has Teff = K and a mass estimate of 8.3 ± 0.5 MJup for a 23 ± 3 Myr age. PSO J318.5-22 is intermediate in mass between 51 Eri b and β Pic b, the two known exoplanet companions in the β Pic moving group. With variability amplitudes from 7% to 10% in JS at two separate epochs over 3-5 hr observations, we constrain the rotational period of this object to >5 hr. In KS, we marginally detect a variability trend of up to 3% over a 3 hr observation. This is the first detection of weather on an extrasolar planetary-mass object. Among L dwarfs surveyed at high photometric precision (<3%), this is the highest amplitude variability detection. Given the low surface gravity of this object, the high amplitude preliminarily suggests that such objects may be more variable than their high-mass counterparts, although observations of a larger sample are necessary to confirm this. Measuring similar variability for directly imaged planetary companions is possible with instruments such as SPHERE and GPI and will provide important constraints on formation. Measuring variability at multiple wavelengths can help constrain cloud structure.en
dc.format.extent6
dc.language.isoeng
dc.relation.ispartofAstrophysical Journal Letters
dc.subjectbrown dwarfs
dc.subjectplanets and satellites: atmospheres
dc.subjectplanets and satellites: gaseous planets
dc.subjectSpace and Planetary Science
dc.subjectAstronomy and Astrophysics
dc.titleVariability in a young, L/T transition planetary-mass objecten
dc.contributor.institutionSchool of Physics, Astronomy and Mathematics
dc.contributor.institutionCentre for Astrophysics Research
dc.description.statusPeer reviewed
rioxxterms.versionAM
rioxxterms.versionofrecordhttps://doi.org/10.1088/2041-8205/813/2/L23
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue


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