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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 421485.0, MPI für Astronomie / Publikationen_mpia
Evidence for a photoevaporated circumbinary disk in Orion
Authors:Robberto, M.; Ricci, L.; Da Rio, N.; Soderblom, D. R.
Date of Publication (YYYY-MM-DD):2008
Title of Journal:The Astrophysical Journal
Start Page:L83
End Page:L86
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:We have found a photoevaporated disk in the Orion Nebula that includes a wide binary. HST ACS observations of the proplyd 124-132 show two pointlike sources separated by 0.15", or about 60 AU at the distance of Orion. The two sources have nearly identical I and z magnitudes. We analyze the brightest component, source N, comparing the observed magnitudes with those predicted using a 1 Myr Baraffe/NextGen isochrone with different accretion luminosities and extinctions. We find that a low-mass (~=0.04 Msolar) brown dwarf ~1 Myr old with mass accretion rate logM~=-10.3, typical for objects of this mass, and about 2 mag of visual extinction provides the best fit to the data. This is the first observation of a circumbinary disk undergoing photoevaporation and, if confirmed by spectroscopic observations, the first direct detection of a wide substellar pair still accreting and enshrouded in its circumbinary disk. Based on observations made with the NASA/ESA Hubble Space Telescope, obtained at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS5-26555. These observations are associated with program 10246.
Free Keywords:Stars: Binaries: General; ISM: Individual: Name: Orion Nebula; ISM: Individual: Messier Number: M42; Stars: Planetary Systems: Protoplanetary Disks; Stars: Low-Mass; Brown Dwarfs
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:URL:http://adsabs.harvard.edu/abs/2008ApJ...687L..83R [ID No:1]
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