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Outflow activity in brown dwarfs

Published online by Cambridge University Press:  01 May 2007

Emma T. Whelan ,
Thomas P. Ray ,
Francesca Bacciotti ,
Sofia Randich ,
Ray Jayawardhana ,
Antonella Natta ,
Leonardo Testi  and
Subu Mohanty
Emma T. Whelan
Affiliation:
Dublin Institute for Advanced Studies email: ewhelan@cp.dias.ie
Thomas P. Ray
Affiliation:
Dublin Institute for Advanced Studies email: ewhelan@cp.dias.ie
Francesca Bacciotti
Affiliation:
Osservatorio Astrofisico di Arcetri
Sofia Randich
Affiliation:
Osservatorio Astrofisico di Arcetri
Ray Jayawardhana
Affiliation:
Department of Astronomy and Astrophysics, University of Toronto
Antonella Natta
Affiliation:
Osservatorio Astrofisico di Arcetri
Leonardo Testi
Affiliation:
Osservatorio Astrofisico di Arcetri
Subu Mohanty
Affiliation:
Harvard-Smithsonian Center for Astrophysics
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Abstract

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While numerous studies have been aimed at understanding the properties of young brown dwarfs relatively little exploration of their potential as drivers of outflows has occurred. Forbidden emission lines are important probes of outflows from young stellar objects, as they trace the shocks which form as an outflow interacts with the ambient medium of its driving source. While forbidden emission was identified in the spectra of young brown dwarfs, indicating the presence of outflows, these lines were weak and confined to the brown dwarf continuum position. Hence their origin in an outflow could not be confirmed. Our approach to this problem, is to analyse the forbidden line regions of brown dwarfs using spectro-astrometry. Spectro-astrometry is a novel technique which allows the user to recover spatial information from a spectrum beyond the limitations of the seeing of the observation. Using this technique we have found two brown dwarf outflows to date. In this chapter we outline this technique, describe our results for the brown dwarfs ρ-Oph 102 and 2MASS1207-3932 and discuss our future plans.

Keywords

2MASSWJ1207334-393254stars: low massbrown dwarfsstars: formationISM: jets and outflows
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S243: Star-Disk Interaction in Young Stars , May 2007 , pp. 357 - 364
Copyright
Copyright © International Astronomical Union 2007

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