Can planetesimals form by collisional fusion?
2013 (English)In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 773, no 2, 120- p.Article in journal (Refereed) Published
As a test bed for the growth of protoplanetary bodies in a turbulent circumstellar disk, we examine the fate of a boulder using direct numerical simulations of particle seeded gas flowing around it. We provide an accurate description of the flow by imposing no-slip and non-penetrating boundary conditions on the boulder surface using the immersed boundary method pioneered by Peskin. Advected by the turbulent disk flow, the dust grains collide with the boulder and we compute the probability density function of the normal component of the collisional velocity. Through this examination of the statistics of collisional velocities, we test the recently developed concept of collisional fusion which provides a physical basis for a range of collisional velocities exhibiting perfect sticking. A boulder can then grow sufficiently rapidly to settle into a Keplerian orbit on disk evolution timescales.
Place, publisher, year, edition, pages
2013. Vol. 773, no 2, 120- p.
accretion, accretion disks, planets and satellites: formation, protoplanetary disks, turbulence
IdentifiersURN: urn:nbn:se:kth:diva-129119DOI: 10.1088/0004-637X/773/2/120ISI: 000323426100039ScopusID: 2-s2.0-84881406128OAI: oai:DiVA.org:kth-129119DiVA: diva2:650187
FunderEU, European Research Council, 227952Swedish Research Council, 2011-5423
QC 201309202013-09-202013-09-192013-09-20Bibliographically approved