Disks, extrasolar planets and migration
Space Science Reviews 92:1-2 (2000) 323-340
Abstract:
We review results about protoplanetary disk models, protoplanet migration and formation of giant planets with migrating cores. We first model the protoplanetary nebula as an α-accretion disk and present steady state calculations for different values of α and gas accretion rate through the disk. We then review the current theories of protoplanet migration in the context of these models, focusing on the gaseous disk-protoplanet tidal interaction. According to these theories, the migration timescale may be shorter than the planetary formation timescale. Therefore we investigate planet formation in the context of a migrating core, considering both the growth of the core and the build-up of the envelope in the course of the migration.Disk evolution towards planet formation
DISKS, PLANETESIMALS, AND PLANETS, PROCEEDINGS 219 (2000) 19-30
The response of an accretion disc to an inclined dipole with application to AA Tauri
Astronomy and Astrophysics 360:3 (2000) 1031-1042
Precession of collimated outflows from young stellar objects
Astrophysical Journal 512:2 PART 2 (1999)
Abstract:
We consider several protostellar systems in which either a precessing jet or at least two misaligned jets have been observed. We assume that the precession of jets is caused by tidal interactions in noncoplanar binary systems. For Cep E, V1331 Cyg, and RNO 15-FIR, the inferred orbital separations and disk radii are in the range 4-160 AU and 1-80 AU, respectively, consistent with those expected for pre-main-sequence stars. Furthermore, we assume or use the fact that the source of misaligned outflows is a binary and evaluate the length scale over which the jets should precess as a result of tidal interactions. For T Tau, HH1 VLA 1/2, and HH 24 SVS63, it may be possible to detect a bending of the jets rather than "wiggling." In HH 111 IRS and L1551 IRS5, wiggling may be detected on the current observed scale. Our results are consistent with the existence of noncoplanar binary systems in which tidal interactions induce jets to precess.Critical protoplanetary core masses in protoplanetary disks and the formation of short-period giant planets
Astrophysical Journal 521:2 PART 1 (1999) 823-838