Planetesimal and gas dynamics in binaries
نویسندگان
چکیده
منابع مشابه
Planetesimal and Gas Dynamics in Binaries
Observations of extrasolar planets reveal that planets can be found in close binary systems, where the semi-major axis of the binary orbit is less than 20 AU. The existence of these planets challenges planet formation theory because the strong gravitational perturbations due to the companion increase encounter velocities between planetesimals and make it difficult for them to grow through accre...
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Currently, one of major problems concerning planet formation theory in close binary systems is, the strong perturbation from the companion star can increase relative velocities (△V ) of planetesimals around the primary and thus hinder their growth. According to previous studies, while gas drag can reduce the △V between bodies of the same sizes by forcing orbital alignment to planetesimals, it i...
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The dynamics of two massive black holes in a rotationally supported nuclear disc of mass Mdisc = 10 8M⊙ is explored using N-Body/SPH simulations. Gas and star particles are co–present in the disc. Described with a Mestel profile, the disc has a vertical support provided by turbulence of the gas, and by stellar velocity dispersion. A primary black hole of mass 4 × 106M⊙ is placed at the centre o...
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امروزه سالیتون ها بعنوان امواج جایگزیده ای که تحت شرایط خاص بدون تغییر شکل در محیط منتشر می-شوند، زمینه مطالعات گسترده ای در حوزه اپتیک غیرخطی هستند. در این راستا توجه به پدیده پراش گسسته، که بعنوان عامل پهن شدگی باریکه نوری در آرایه ای از موجبرهای جفت شده، ظاهر می گردد، ضروری است، زیرا سالیتون های گسسته از خنثی شدن پراش گسسته در این سیستم ها بوسیله عوامل غیرخطی بوجود می آیند. گسستگی سیستم عامل...
Planetesimal Accretion onto Growing Proto-Gas-Giant Planets
The solar and extra solar gas giants appear to have diverse internal structure and metallicities. We examine a potential cause for these dispersions in the context of the conventional sequential accretion formation scenario, which assumes the initial formation of cores from protoplanetary embryos. In principle, gas accretion onto cores with masses below several times that of the Earth is suppre...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2008
ISSN: 0035-8711,1365-2966
DOI: 10.1111/j.1365-2966.2008.13080.x