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27 April 2024 |
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Dust in the inner regions of debris disks around A stars | | R.L. Akeson
; D.R. Ciardi
; R. Millan-Gabet
; A. Merand
; E. Di Folco
; J.D. Monnier
; C.A. Beichman
; O. Absil
; J. Aufdenberg
; H. McAlister
; T. ten Brummelaar
; J. Sturmann
; L. Sturmann
; N. Turner
; | | Date: |
21 Oct 2008 | | Abstract: | We present infrared interferometric observations of the inner regions of two
A-star debris disks, beta Leo and zeta Lep, using the FLUOR instrument at the
CHARA interferometer on both short (30 m) and long (>200 m) baselines. For the
target stars, the short baseline visibilities are lower than expected for the
stellar photosphere alone, while those of a check star, delta Leo, are not. We
interpret this visibility offset of a few percent as a near-infrared excess
arising from dust grains which, due to the instrumental field of view, must be
located within several AU of the central star. For beta Leo, the near-infrared
excess producing grains are spatially distinct from the dust which produces the
previously known mid-infrared excess. For zeta Lep, the near-infrared excess
may be spatially associated with the mid-infrared excess producing material. We
present simple geometric models which are consistent with the near and
mid-infrared excess and show that for both objects, the near-infrared producing
material is most consistent with a thin ring of dust near the sublimation
radius with typical grain sizes smaller than the nominal radiation pressure
blowout radius. Finally, we discuss possible origins of the near-infrared
emitting dust in the context of debris disk evolution models. | | Source: | arXiv, 0810.3701 | | Services: | Forum | Review | PDF | Favorites | |
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