Article (Scientific journals)
Spiral waves triggered by shadows in transition disks
Montesinos, Matias; Pérez, Sebastian; Casassus, Simon et al.
2016In Astrophysical Journal. Letters
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Abstract :
[en] 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 $\sim$28$^\circ$. 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 $\Pi \sim 15^\circ-22^\circ$ at the onset, to $\sim$11$^\circ$-14$^\circ$, over $\sim$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.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Montesinos, Matias
Pérez, Sebastian
Casassus, Simon
Marino, Sebastian
Cuadra, Jorge
Christiaens, Valentin  ;  Université de Liège - ULiège > Form. doct. sc. (sc. spatiales - paysage)
Language :
English
Title :
Spiral waves triggered by shadows in transition disks
Publication date :
13 May 2016
Journal title :
Astrophysical Journal. Letters
ISSN :
2041-8205
eISSN :
2041-8213
Publisher :
IOP Publishing, Bristol, United Kingdom
Peer reviewed :
Peer Reviewed verified by ORBi
Commentary :
The copyright belongs to the Astrophysical Journal.
Available on ORBi :
since 24 May 2016

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