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Spiral Arms in the Asymmetrically Illuminated Disk of MWC 758 and Constraints on Giant Planets | | C. A. Grady
; T. Muto
; J. Hashimoto
; M. Fukagawa
; T. Currie
; B. Biller
; C. Thalmann
; M. L. Sitko
; R. Russell
; J. Wisniewski
; R. Dong
; J. Kwon
; S. Sai
; J. Hornbeck
; G. Schneider
; D. Hines
; A. Moro-Martin
; M. Feldt
; Th. Henning
; J.-U. Pott
; M. Bonnefoy
; J. Bouwman
; S. Lacour
; A. Mueller
; A. Juhasz
; A. Crida
; G. Chauvin
; S. Andrews
; D. Wilner
; A. Kraus
; S. Dahm
; T. Robitaille
; H. Jang-Condell
; L. Abe
; E. Akiyama
; W. Brandner
; T. Brandt
; J. Carson
; S. Egner
; K. B. Follette
; M. Goto
; O. Guyon
; Y. Hayano
; M. Hayashi
; S. Hayashi
; K. Hodapp
; M. Ishii
; M. Iye
; M. Janson
; R. Kandori
; G. Knapp
; T. Kudo
; N. Kusakabe
; M. Kuzuhara
; S. Mayama
; M. McElwain
; T. Matsuo
; S. Miyama
; J.-I. Morino
; T. Nishimura
; T.-S. Pyo
; G. Serabyn
; H. Suto
; R. Suzuki
; M. Takami
; N. Takato
; H. Terada
; D. Tomono
; E. Turner
; M. Watanabe
; T. Yamada
; H. Takami
; T. Usuda
; M. Tamura
; | | Date: |
6 Dec 2012 | | Abstract: | We present the first near-IR scattered light detection of the transitional
disk associated with the Herbig Ae star MWC 758 using data obtained as part of
the Strategic Exploration of Exoplanets and Disks with Subaru, and 1.1 micron
HST/NICMOS data. While sub-millimeter studies suggested there is a
dust-depleted cavity with r=0.35, we find scattered light as close as 0.1
(20-28 AU) from the star, with no visible cavity at H, K’, or Ks. We find two
small-scaled spiral structures which asymmetrically shadow the outer disk. We
model one of the spirals using spiral density wave theory, and derive a disk
aspect ratio of h ~ 0.18, indicating a dynamically warm disk. If the spiral
pattern is excited by a perturber, we estimate its mass to be 5+3,-4 Mj, in the
range where planet filtration models predict accretion continuing onto the
star. Using a combination of non-redundant aperture masking data at L’ and
angular differential imaging with Locally Optimized Combination of Images at K’
and Ks, we exclude stellar or massive brown dwarf companions within 300 mas of
the Herbig Ae star, and all but planetary mass companions exterior to 0.5. We
reach 5-sigma contrasts limiting companions to planetary masses, 3-4 MJ at 1.0
and 2 MJ at 1.55 using the COND models. Collectively, these data strengthen the
case for MWC 758 already being a young planetary system. | | Source: | arXiv, 1212.1466 | | Services: | Forum | Review | PDF | Favorites | |
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