Dust in the inner regions of debris disks around A stars

Details Dust in the inner regions of debris disks around A stars Dust in the inner regions of debris disks around A stars

2008-10-20

arxiv.org/abs/0810.3701v1

Astrophys.J.691:1896-1908,2009

Astronomy and Astrophysics

Astrophysics

20 pages, 2 figures, to appear in the Astrophysical Journal

Scientific paper

10.1088/0004-637X/691/2/1896

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.

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