Spiral waves triggered by shadows in transition disks
Author
dc.contributor.author
Montesinos, Matías
Author
dc.contributor.author
Pérez, Sebastián
Author
dc.contributor.author
Casassus Montero, Simón
Author
dc.contributor.author
Marino, Sebastián
Author
dc.contributor.author
Cuadra, Jorge
Author
dc.contributor.author
Christiaens, Valentín
Admission date
dc.date.accessioned
2016-11-17T19:29:06Z
Available date
dc.date.available
2016-11-17T19:29:06Z
Publication date
dc.date.issued
2016
Cita de ítem
dc.identifier.citation
The Astrophysical Journal Letters, 823:L8 (6pp), 2016 May 20
es_ES
Identifier
dc.identifier.other
10.3847/2041-8205/823/1/L8
Identifier
dc.identifier.uri
https://repositorio.uchile.cl/handle/2250/141260
Abstract
dc.description.abstract
Circumstellar asymmetries such as central warps have recently been shown to cast shadows on outer disks. We investigate the hydrodynamical consequences of such variable illumination on the outer regions of a transition disk, and the development of spiral arms. Using 2D simulations, we follow the evolution of a gaseous disk passively heated by the central star, under the periodic forcing of shadows with an opening angle of similar to 28 degrees. With a lower pressure under the shadows, each crossing results in a variable azimuthal acceleration, which in time develops into spiral density waves. Their pitch angles evolve from Pi similar to 15 degrees-22 degrees at the onset, to similar to 11 degrees-14 degrees, over similar to 65 au to 150 au. Self-gravity enhances the density contrast of the spiral waves, as also reported previously for spirals launched by planets. Our control simulations with unshadowed irradiation do not develop structures, except for a different form of spiral waves seen at later times only in the gravitationally unstable control case. Scattered light predictions in the H-band show that such illumination spirals should be observable. We suggest that spiral arms in the case-study transition disk HD 142527 could be explained as a result of shadowing from the tilted inner disk.
es_ES
Patrocinador
dc.description.sponsorship
Millennium Nucleus grant
RC130007
CONICYT-Gemini grant
32130007
FONDECYT
1130949
3140601
1141175