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29 March 2024 |
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Spirals inside the millimeter cavity of transition disk SR 21 | G. A. Muro-Arena
; C. Ginski
; C. Dominik
; M. Benisty
; P. Pinilla
; A. J. Bohn
; T. Moldenhauer
; W. Kley
; D. Harsono
; T. Henning
; R. G. van Holstein
; M. Janson
; M. Keppler
; F. Ménard
; L. M. Pérez
; T. Stolker
; M. Tazzari
; M. Villenave
; A. Zurlo
; C. Petit
; F. Rigal
; O. Möller-Nilsson
; M. Llored
; T. Moulin
; P.Rabou
; | Date: |
18 Mar 2020 | Abstract: | Hydrodynamical simulations of planet-disk interactions suggest that planets
may be responsible for a number of the sub-structures frequently observed in
disks in both scattered light and dust thermal emission. Despite the ubiquity
of these features, direct evidence of planets embedded in disks and of the
specific interaction features like spiral arms within planetary gaps still
remain rare. In this study we discuss recent observational results in the
context of hydrodynamical simulations in order to infer the properties of a
putative embedded planet in the cavity of a transition disk. We imaged the
transition disk SR 21 in H-band in scattered light with SPHERE/IRDIS and in
thermal dust emission with ALMA band 3 (3mm) observations at a spatial
resolution of 0.1". We combine these datasets with existing band 9 (430um) and
band 7 (870um) ALMA continuum data. The Band 3 continuum data reveals a large
cavity and a bright ring peaking at 53 au strongly suggestive of dust
trapping.The ring shows a pronounced azimuthal asymmetry, with a bright region
in the north-west that we interpret as a dust over-density. A
similarly-asymmetric ring is revealed at the same location in polarized
scattered light, in addition to a set of bright spirals inside the mm cavity
and a fainter spiral bridging the gap to the outer ring. These features are
consistent with a number of previous hydrodynamical models of planet-disk
interactions, and suggest the presence of a ~1 MJup planet at 44 au and
PA=11{deg}. This makes SR21 the first disk showing spiral arms inside the mm
cavity, as well as one for which the location of a putative planet can be
precisely inferred. With the location of a possible planet being
well-constrained by observations, it is an ideal candidate for follow-up
observations to search for direct evidence of a planetary companion still
embedded in its disk. | Source: | arXiv, 2003.8189 | Services: | Forum | Review | PDF | Favorites |
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