Other
Scientific paper
Dec 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000phdt........84p&link_type=abstract
Thesis (PH. D.)-University of Florida, 2000
Other
Pre-Main-Sequence, Infrared, Protoplanetary Disks, Circumstellar Matter
Scientific paper
The recent discoveries of extrasolar planets have spurred investigations of pre-main sequence stars and their environments. Theory suggests that planets form in dusty circumstellar disks around young stars. Many young stars exhibit large excesses of infrared emission that have been attributed to circumstellar disks. In the case of th lower mass stars such as the T Tauri and Vega classes, the association of the IR excess with a disk has been confirmed by direct imaging of disks. However, no disks have been convincingly detected around intermediate mass stars, the Herbig Ae/Be stars. My study involves high spatial resolution multi-wavelength mid-IR imaging of these objects. I show that in many cases the mid-IR emission is not dominated by emission from a circumstellar disk, but arises in other physical phenomena. Many Herbig stars are members of multiple systems and the companions contribute a large portion of the mid-IR emission. In addition some systems exhibit large-scale extended emission from dust shells. Other objects show evidence of tiny dust grains that emit preferentially in the mid-IR. My research shows that mid-IR imaging can directly impact models of the circumstellar environments of these young stars. No circumstellar disks were detected in my sample. Disks may not be present around these stars, or the disks of Herbig stars may be too close to the central star to be resolved with the telescopes used in this study.
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