تقرير
Formation of Super-Earth Mass Planets at 125-250 AU from a Solar-type Star
| العنوان: | Formation of Super-Earth Mass Planets at 125-250 AU from a Solar-type Star |
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| المؤلفون: | Kenyon, S. J., Bromley, B. C. |
| سنة النشر: | 2015 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - Earth and Planetary Astrophysics, Astrophysics - Solar and Stellar Astrophysics |
| الوصف: | We investigate pathways for the formation of icy super-Earth mass planets orbiting at 125-250 AU around a 1 solar mass star. An extensive suite of coagulation calculations demonstrates that swarms of 1 cm to 10 m planetesimals can form super-Earth mass planets on time scales of 1-3 Gyr. Collisional damping of 0.01-100 cm particles during oligarchic growth is a highlight of these simulations. In some situations, damping initiates a second runaway growth phase where 100-3000 km protoplanets grow to super-Earth sizes. Our results establish the initial conditions and physical processes required for in situ formation of super-Earth planets at large distances from the host star. For nearby dusty disks in HD 107146, HD 202628, and HD 207129, ongoing super-Earth formation at 80-150 AU could produce gaps and other structures in the debris. In the solar system, forming a putative planet X at a < 300 AU (a > 1000 AU) requires a modest (very massive) protosolar nebula. Comment: 48 pages of text, 23 figures, ApJ in press, revised version contains new text on aspects of the calculations and a more comprehensive description of the origin of the second phase of runaway growth |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1088/0004-637X/806/1/42 |
| URL الوصول: | http://arxiv.org/abs/1501.05659 |
| رقم الأكسشن: | edsarx.1501.05659 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1088/0004-637X/806/1/42 |
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