Hostname: page-component-cd9895bd7-dk4vv Total loading time: 0 Render date: 2024-12-23T15:28:32.177Z Has data issue: false hasContentIssue false

Dead zones and the diversity of exoplanetary systems

Published online by Cambridge University Press:  10 November 2011

Yasuhiro Hasegawa
Affiliation:
Department of Physics and Astronomy McMaster University, Hamilton ON, L8S 4M1, Canada email: [email protected]
Ralph E. Pudritz
Affiliation:
Department of Physics and Astronomy McMaster University, Hamilton ON, L8S 4M1, Canada email: [email protected] Origins Institute, McMaster University, Hamilton ON, L8S 4M1, Canada email: [email protected]
Rights & Permissions [Opens in a new window]

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

Planetary migration provides a theoretical basis for the observed diversity of exoplanetary systems. We demonstrate that dust settling - an inescapable feature of disk evolution - gives even more rapid type I migration by up to a factor of about 2 than occurs in disks with fully mixed dust. On the other hand, type II migration becomes slower by a factor of 2 due to dust settling. This even more problematic type I migration can be resolved by the presence of a dead zone; the inner, high density region of a disk which features a low level of turbulence. We show that enhanced dust settling in the dead zone leaves a dusty wall at its outer edge. Back-heating of the dead zone by this wall produces a positive radial gradient for the disk temperature, which acts as a barrier for type I migration.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2011

References

Gammie, C. F. 1996, ApJ, 457, 355CrossRefGoogle Scholar
Hasegawa, Y. & Pudritz, R. E. 2010a, ApJ, 710, L167CrossRefGoogle Scholar
Hasegawa, Y. & Pudritz, R. E. 2010b, MNRAS, 401, 143CrossRefGoogle Scholar
Hasegawa, Y. & Pudritz, R. E. 2011, MNRAS, 413, 286CrossRefGoogle Scholar
Udry, S. & Santos, N. C. 2007, ARAA, 45, 397CrossRefGoogle Scholar
Ward, W. R. 1997, Icarus, 126, 261CrossRefGoogle Scholar