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19 April 2024 |
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On the Morphology and Chemical Composition of the HR 4796A Debris Disk | | Timothy J. Rodigas
; Christopher C. Stark
; Alycia Weinberger
; John H. Debes
; Philip M. Hinz
; Laird Close
; Christine Chen
; Paul S. Smith
; Jared R. Males
; Andrew J. Skemer
; Alfio Puglisi
; Katherine B. Follette
; Katie Morzinski
; Ya-Lin Wu
; Runa Briguglio
; Simone Esposito
; Enrico Pinna
; Armando Riccardi
; Glenn Schneider
; Marco Xompero
; | | Date: |
28 Oct 2014 | | Abstract: | [abridged] We present resolved images of the HR 4796A debris disk using the
Magellan adaptive optics system paired with Clio-2 and VisAO. We detect the
disk at 0.77 microns, 0.91 microns, 0.99 microns, 2.15 microns, 3.1
microns, 3.3 microns, and 3.8 microns. We find that the deprojected center
of the ring is offset from the star by 4.76$pm$1.6 AU and that the deprojected
eccentricity is 0.06$pm$0.02, in general agreement with previous studies. We
find that the average width of the ring is 14$^{+3}_{-2}%$, also comparable to
previous measurements. Such a narrow ring precludes the existence of
shepherding planets more massive than about 4 mj, comparable to hot-start
planets we could have detected beyond about 60 AU in projected separation.
Combining our new scattered light data with archival HST/STIS and HST/NICMOS
data at about 0.5-2 microns, along with previously unpublished Spitzer/MIPS
thermal emission data and all other literature thermal data, we set out to
constrain the chemical composition of the dust grains. After testing 19
individual root compositions and more than 8,400 unique mixtures of these
compositions, we find that good fits to the scattered light alone and thermal
emission alone are discrepant, suggesting that caution should be exercised if
fitting to only one or the other. When we fit to both the scattered light and
thermal emission simultaneously, we find mediocre fits (reduced chi-square
about 2). In general, however, we find that silicates and organics are the
most favored, and that water ice is usually not favored. These results suggest
that the common constituents of both interstellar dust and solar system comets
also may reside around HR 4796A, though improved modeling is necessary to place
better constraints on the exact chemical composition of the dust. | | Source: | arXiv, 1410.7753 | | Services: | Forum | Review | PDF | Favorites | |
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