| | |
| | |
Stat |
Members: 3643 Articles: 2'487'895 Articles rated: 2609
28 March 2024 |
|
| | | |
|
Article overview
| |
|
Confirming the Primarily Smooth Structure of the Vega Debris Disk at Millimeter Wavelengths | A. M. Hughes
; D. J. Wilner
; B. Mason
; J. M. Carpenter
; R. Plambeck
; H.-F. Chiang
; S. M. Andrews
; J. P. Williams
; A. Hales
; K. Su
; E. Chiang
; S. Dicker
; P. Korngut
; M. Devlin
; | Date: |
1 Mar 2012 | Abstract: | Clumpy structure in the debris disk around Vega has been previously reported
at millimeter wavelengths and attributed to concentrations of dust grains
trapped in resonances with an unseen planet. However, recent imaging at similar
wavelengths with higher sensitivity has disputed the observed structure. We
present three new millimeter-wavelength observations that help to resolve the
puzzling and contradictory observations. We have observed the Vega system with
the Submillimeter Array (SMA) at a wavelength of 880 um and angular resolution
of 5"; with the Combined Array for Research in Millimeter-wave Astronomy
(CARMA) at a wavelength of 1.3 mm and angular resolution of 5"; and with the
Green Bank Telescope (GBT) at a wavelength of 3.3 mm and angular resolution of
10". Despite high sensitivity and short baselines, we do not detect the Vega
debris disk in either of the interferometric data sets (SMA and CARMA), which
should be sensitive at high significance to clumpy structure based on
previously reported observations. We obtain a marginal (3-sigma) detection of
disk emission in the GBT data; the spatial distribution of the emission is not
well constrained. We analyze the observations in the context of several
different models, demonstrating that the observations are consistent with a
smooth, broad, axisymmetric disk with inner radius 20-100 AU and width >50 AU.
The interferometric data require that at least half of the 860 um emission
detected by previous single-dish observations with the James Clerk Maxwell
Telescope be distributed axisymmetrically, ruling out strong contributions from
flux concentrations on spatial scales of <100 AU. These observations support
recent results from the Plateau de Bure Interferometer indicating that previous
detections of clumpy structure in the Vega debris disk were spurious. | Source: | arXiv, 1203.0318 | Services: | Forum | Review | PDF | Favorites |
|
|
No review found.
Did you like this article?
Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.
browser claudebot
|
| |
|
|
|
| News, job offers and information for researchers and scientists:
| |