Irradiated Disks around accreting brown dwarfs

Details Irradiated Disks around accreting brown dwarfs Irradiated Disks around accreting brown dwarfs

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sptz.prop50799h&link_type=abstract

Spitzer Proposal ID #50799

Physics

Scientific paper

The growth and orbits of planets may be partially determined by the level of disk ionization caused by EUV and X-ray emission from the central star. However, until recently the ionized layer of the disk surface was difficult to study because of a lack of observational diagnostics. [Ne II] emission at 12.8 microns may be a powerful probe of the irradiated disk surface, and possibly a photoevaporative region if present. To date, surveys for [Ne II] have been restricted to stars with >0.3 M_sun. I propose to look for [Ne II] emission from a sample of 10 accreting brown dwarfs and very low-mass stars. Measuring the flux in the [Ne II] line at such low masses would help to constrain disk irradiation models for a larger range of mass and mass accretion rate than is currently possible.

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