Details

Autor(en) / Beteiligte

• Paardekooper, S.-J.
• Baruteau, C.
• Crida, A.
• Kley, W.

Titel

A torque formula for non-isothermal type I planetary migration – I. Unsaturated horseshoe drag

Ist Teil von

• Monthly notices of the Royal Astronomical Society, 2010-01, Vol.401 (3), p.1950-1964

Ort / Verlag

Oxford, UK: Blackwell Publishing Ltd

Erscheinungsjahr

2010

Quelle

Free E-Journal (出版社公開部分のみ）

Beschreibungen/Notizen

• We study the torque on low-mass planets embedded in protoplanetary discs in the two-dimensional approximation, incorporating non-isothermal effects. We couple linear estimates of the Lindblad (or wave) torque to a simple, but non-linear, model of adiabatic corotation torques (or horseshoe drag), resulting in a simple formula that governs type I migration in non-isothermal discs. This formula should apply in optically thick regions of the disc, where viscous and thermal diffusion act to keep the horseshoe drag unsaturated. We check this formula against numerical hydrodynamical simulations, using three independent numerical methods, and find good agreement.