Physical Processes Responsible for the Removal of Circumstellar Disks
نویسندگان
چکیده
منابع مشابه
Observations of Circumstellar Disks
The imaging of disks around young stars presents extreme challenges in high dynamic range, angular resolution, and sensitivity. Recent instrumental advances have met these challenges admirably, leading to a marked increase in imaging discoveries. These have opened up a new era in studies of the origin of planetary systems. Questions about our own solar system’s formation, and of the prevalence ...
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We present a series of 2-dimensional hydrodynamic simulations of massive disks around protostars. We simulate the same physical problem using both a ‘Piecewise Parabolic Method’ (PPM) code and a ‘Smoothed Particle Hydrodynamic’ (SPH) code, and analyze their differences. The disks studied here range in mass from 0.05M∗ to 1.0M∗ and in initial minimum Toomre Q value from 1.1 to 3.0. We adopt simp...
متن کاملMicrolensing of Circumstellar Disks
We investigate the microlensing effects on a source star surrounded by a circumstellar disk, as a function of wavelength. In the midand far-infrared, where the emission of the system is dominated by the cold dusty disk, the microlensing light curve encodes the geometry and surface brightness profile of the disk. For a system located at the Galactic center, we find typical magnifications to be o...
متن کاملVortices in Circumstellar Disks
We discuss the physics of vortices in the circumstellar disks associated with young stellar objects. We elucidate the basic physical properties of these localized storm systems. In particular, we consider point vortices, linear vortices, the eeects of self-gravity, magnetic elds, and nonlinear aspects of the problem. We nd that these vortices can exist in many diierent forms in the disks of you...
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In the early 1980s, the Infrared Astronomy Satellite (IRAS) detected thermal emission from dust grains with temperatures of 50-125 K and fractional luminosities (Lgrains/L∗) in the range 10 -10 around four main sequence stars: Vega, Fomalhaut, β Pictoris, and ǫ Eridani. Coronagraphic observations of β Pic confirmed that the grains do indeed lie in a disk, perhaps associated with a young planeta...
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ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 2000
ISSN: 0074-1809
DOI: 10.1017/s0074180900164976