Image: ISAS/JAXA
Christopher StarkUniversity of Maryland
NASA Goddard Space Flight Center
Collisional Grooming:
Including Collisions in (Prohibitively Large)N-body Simulations
Fomalhaut
Kalas et al. 2005
Greaves et al. 1998
Eri
QuickTime™ and aTIFF (Uncompressed) decompressor
are needed to see this picture.
Schneider et al. 2009
HR 4796A
Fomalhaut
Kalas et al. 2005
Greaves et al. 1998
Eri
QuickTime™ and aTIFF (Uncompressed) decompressor
are needed to see this picture.
Schneider et al. 2009
HR 4796A
QuickTime™ and aTIFF (Uncompressed) decompressor
are needed to see this picture.
Velocity Dispersion in a Structured Debris Disk
PR + solarwind drag
Stellargravitational
force
Planetarygravitational
forces Radiation pressure
QuickTime™ and aTIFF (Uncompressed) decompressor
are needed to see this picture.
QuickTime™ and aTIFF (Uncompressed) decompressor
are needed to see this picture.
QuickTime™ and aTIFF (Uncompressed) decompressor
are needed to see this picture.
QuickTime™ and aTIFF (Uncompressed) decompressor
are needed to see this picture.
QuickTime™ and aTIFF (Uncompressed) decompressor
are needed to see this picture.
Ni = Ni(t=0)
Ni(t=t) = Ni(t=0)e-
Ni(t=2t) = Ni(t=t)e-
Ni(t=3t) = Ni(t=2t)e-
i
i
i
The Collisional Grooming Algorithm
QuickTime™ and aTIFF (Uncompressed) decompressor
are needed to see this picture.
Iterative Convergence of the Collisional Grooming Algorithm
QuickTime™ and aTIFF (Uncompressed) decompressor
are needed to see this picture.
Correctness of Solution to the Mass Flux Equation
QuickTime™ and aTIFF (Uncompressed) decompressor
are needed to see this picture.
QuickTime™ and aTIFF (Uncompressed) decompressor
are needed to see this picture.
Qu
ickTim
e™
and a
TIF
F (
Un
com
pre
ssed)
decom
pre
sso
rare
need
ed t
o s
ee t
his
pic
ture
.Collision Rate in a Resonant Ring Structure
Collision Rate in a Resonant Ring Structure
QuickTime™ and aTIFF (Uncompressed) decompressor
are needed to see this picture.
No Collisions More Collisions
QuickTime™ and aTIFF (Uncompressed) decompressor
are needed to see this picture.
Fomalhaut
Kalas et al. 2005
Greaves et al. 1998
Eri
QuickTime™ and aTIFF (Uncompressed) decompressor
are needed to see this picture.
Schneider et al. 2009
HR 4796A
QuickTime™ and aTIFF (Uncompressed) decompressor
are needed to see this picture.
Distribution of KBOs
QuickTime™ and aTIFF (Uncompressed) decompressor
are needed to see this picture.
Disk-Total Grain Size Distribution
QuickTime™ and aTIFF (Uncompressed) decompressor
are needed to see this picture.
Summary
• Grain-grain collisions play an important role in determining debris disk morphology, even for disks with optical depths ~10-7
• Collisional grooming allows us to include gravitational resonant dynamics and grain-grain collisions simultaneously & self-consistently
• Algorithm runs post-integration & takes ~1 hour on a single processor