![]() |
COOKIES: By using this website you agree that we can place Google Analytics Cookies on your device for performance monitoring. | ![]() |
University of Cambridge > Talks.cam > DAMTP Astro Lunch > Dead, Undead and Zombie Zones in Protoplanetary Disks: Can the MRI survive?
![]() Dead, Undead and Zombie Zones in Protoplanetary Disks: Can the MRI survive?Add to your list(s) Download to your calendar using vCal
If you have a question about this talk, please contact Clement Baruteau. The magneto-rotational instability (MRI) is currently the best candidate for supplying the anomalous viscosity required to drive accretion in protoplanetary disks. However, most past studies have examined the MRI under ideal MHD conditions, or considered only Ohmic dissipation. We show that the inclusion of dust grains and the effects of ambipolar diffusion can strongly suppress the MRI . The resulting accretion rates are at least an order of magnitude lower than observed, indicating that substantial grain growth and settling is required for the MRI to be a viable mechanism; this is consistent with the growth/settling observed in these disks. Moreover, the accretion is also spatially and temporally variable, producing over- and under-densities in the disk that have strong consequences for planet formation and inhibition of migration. This talk is part of the DAMTP Astro Lunch series. This talk is included in these lists:
Note that ex-directory lists are not shown. |
Other listsLife Sciences Earthwatch Lecture Chemical Engineering and Biotechnology Departmental SeminarsOther talksBayesian optimal design for Gaussian process model Is Primary Care Research important, and can it be led by primary care? Deterministic RBF Surrogate Methods for Uncertainty Quantification, Global Optimization and Parallel HPC Applications On the elastic-brittle versus ductile fracture of lattice materials |