|COOKIES: By using this website you agree that we can place Google Analytics Cookies on your device for performance monitoring.|
Collisional growth of planetesimals
If you have a question about this talk, please contact Jérôme Guilet.
Traditional models of planetesimal growth begin with kilometre sized bodies, which grow by pairwise collisions. The fastest growing bodies run away from the distribution, which causes larger planetesimals (100-1000 km) to form with low (less than 1 percent) efficiency. This low efficiency has been regarded as favourable, as the mass of the asteroid and Kuiper belts is similarly lower than the expectations from the minimum mass solar nebula.
However, new results suggest that the Kuiper belt region could never have had much more mass than it does today, and that extrasolar debris disks contain enough mass in larger (100~1000 km) bodies that they must have formed with high efficiency. We revisit growth starting from a kilometre, and show it always has low efficiency. We consider an alternate case, where planetesimals grow by accreting very small (cm) objects, and show that collisional cooling among the cm grains changes the character of growth, allowing it to proceed with high efficiency, satisfying the observational demands of the Kuiper belt and extrasolar debris disks.
This talk is part of the Informal Lunch Seminars in AFD series.
This talk is included in these lists:
Note that ex-directory lists are not shown.
Other listsCAMSED Disease: From Lab to Clinic - Caius MedSoc Talks, Michaelmas 2015 Dobson Group - General Interest
Other talksDetecting cyclists through computer vision Raising awareness and sisterhood: do we still need 1960s' tools for 21st century social change? Cellulose Photonics: From Nature To Applications Tales from the crypt: How science harvests death for humanity's benefit High-density Reservoir Networks in Semiarid Northeastern Brazil Curing diseases and exchanging knowledge: sixteenth-century physicians and their female patients