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dc.contributor.authorScholz, Alexander
dc.contributor.authorJayawardhana, Ray
dc.date.accessioned2013-09-13T13:31:01Z
dc.date.available2013-09-13T13:31:01Z
dc.date.issued2008-01-01
dc.identifier.citationScholz , A & Jayawardhana , R 2008 , ' Dusty disks at the bottom of the initial mass function ' , Astrophysical Journal Letters , vol. 672 , no. 1 , pp. L49-L52 . https://doi.org/10.1086/526340en
dc.identifier.issn2041-8205
dc.identifier.otherPURE: 615631
dc.identifier.otherPURE UUID: 56c5087d-5418-4f17-b5f2-539e4c2f4fca
dc.identifier.otherWOS: 000255231900013
dc.identifier.otherScopus: 41149171250
dc.identifier.urihttp://hdl.handle.net/10023/4050
dc.description.abstractIsolated planetary-mass objects (IPMOs) have masses close to or below the deuterium-burning mass limit (similar to 15 M-Jup)-at the bottom of the stellar initial mass function. We present an exploratory survey for disks in this mass regime, based on a dedicated observing campaign with the Spitzer Space Telescope. Our targets include the full sample of spectroscopically confirmed IPMOs in the sigma Orionis cluster, a total of 18 sources. In the mass range, we identify four objects with > 13 sigma color excess at a wavelength of 8.0 mu m, interpreted as emission 8-20 M-Jup from dusty disks. We thus establish that a substantial fraction of IPMOs harbor disks with lifetimes of at least 2 4 Myr (the likely age of the cluster), indicating an origin from core collapse and fragmentation processes. The disk frequency in the IPMO sample is 29 +/-(16)(13)% at 8.0 mu m, very similar to what has been found for stars and brown dwarfs (similar to 30%). The object S Ori 70, a candidate 3 M-Jup object in this cluster, shows IRAC colors in excess of the typical values for field T dwarfs (on a 2 sigma level), possibly due to disk emission or low gravity. This is a new indication for youth and thus an extremely low mass for S Ori 70.
dc.format.extent4
dc.language.isoeng
dc.relation.ispartofAstrophysical Journal Lettersen
dc.rights(c) 2008 The American Astronomical Society. Deposited according to publisher policy. The definitive version is available from http://iopscience.iop.orgen
dc.subjectCircumstellar matteren
dc.subjectPlanetary systemsen
dc.subjectPlanetary systems : protoplanetary disksen
dc.subjectStars : formationen
dc.subjectStars : low-massen
dc.subjectBrown dwarfsen
dc.subjectYoung brown dwarfsen
dc.subjectSigma-orionis clusteren
dc.subjectObjectsen
dc.subjectPhotometryen
dc.subjectspectroscopyen
dc.subjectPopulationen
dc.subjectQC Physicsen
dc.subject.lccQCen
dc.titleDusty disks at the bottom of the initial mass functionen
dc.typeJournal articleen
dc.description.versionPublisher PDFen
dc.contributor.institutionUniversity of St Andrews.School of Physics and Astronomyen
dc.identifier.doihttps://doi.org/10.1086/526340
dc.description.statusPeer revieweden
dc.identifier.urlhttp://www.scopus.com/inward/record.url?scp=41149171250&partnerID=8YFLogxKen


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