کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1776088 | 1021224 | 2006 | 14 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Relative velocities among accreting planetesimals in binary systems: The circumprimary case
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موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
علوم فضا و نجوم
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چکیده انگلیسی
We investigate classical planetesimal accretion in a binary star system of separation ab⩽50AU by numerical simulations, with particular focus on the region at a distance of 1 AU from the primary. The planetesimals orbit the primary, are perturbed by the companion and are in addition subjected to a gas drag force. We concentrate on the problem of relative velocities Îv among planetesimals of different sizes. For various stellar mass ratios and binary orbital parameters we determine regions where Îv exceed planetesimal escape velocities vesc (thus preventing runaway accretion) or even the threshold velocity vero for which erosion dominates accretion. Gaseous friction has two crucial effects on the velocity distribution: it damps secular perturbations by forcing periastron alignment of orbits, but at the same time the size-dependence of this orbital alignment induces a significant Îv increase between bodies of different sizes. This differential phasing effect proves very efficient and almost always increases Îv to values preventing runaway accretion, except in a narrow ebâ0 domain. The erosion threshold Îv>vero is reached in a wide (ab,eb) space for small <10-km planetesimals, but in a much more limited region for bigger â50-km objects. In the intermediate vesc<Îv
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Icarus - Volume 183, Issue 1, July 2006, Pages 193-206
Journal: Icarus - Volume 183, Issue 1, July 2006, Pages 193-206
نویسندگان
P. Thébault, F. Marzari, H. Scholl,