Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The nature of mid-infrared excesses from hot dust around Sun-like stars   (ABRIDGED) Studies of debris disks have shown that most systems are analogous
to the Edgeworth-Kuiper Belt. However a rare subset of sun-like stars possess
dust which lies in the terrestrial planet region. In this study we aim to
determine how many sources with apparent mid-IR excess are truly hosts of warm
dust, and investigate where the dust must lie. We observed using mid-IR imaging
with TIMMI2, VISIR and MICHELLE a sample of FGK main sequence stars reported to
have hot dust. A new modelling approach was developed to determine the
constraints that can be set on the radial extent of excess emission. We confirm
the presence of warm dust around 3 of the candidates (eta Corvi, HD145263 and
HD202406), and present constraints on the emitting dust regions. Of 2
alternative models for the eta Corvi excess emission, we find that a model with
1 hot dust component at <3 AU (combined with the known submm dust population)
fits the data better at the 2.6sigma level than an alternative model with 2
populations of dust in the mid-IR. We identify several systems which have a
companion (HD65277 and HD79873) or background object (HD53246, HD123356 and
HD128400) responsible for their mid-infrared excess, and for 3 other systems we
were able to rule out a point-like source near the star at the level of excess
observed in lower resolution observations (HD12039, HD69830 and HD191089). Hot
dust sources are either young and possibly primordial or transitional, or have
relatively small radius steady-state planetesimal belts, or they are old and
luminous with transient emission. High resolution imaging can be used to
constrain the location of the disk and help to discriminate between different
models of disk emission. For some small disks, interferometry is needed to
resolve the disk location.

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The categories of this paper are: ao-sci
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The categories of this paper are: nucl-th
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The categories of this paper are: cmp-lg
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The categories of this paper are: chao-dyn
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The categories of this paper are: econ
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The categories of this paper are: supr-con
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The categories of this paper are: cond-mat
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The categories of this paper are: math-ph
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The categories of this paper are: funct-an
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The categories of this paper are: cs
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The categories of this paper are: physics
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The categories of this paper are: hep-lat
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The categories of this paper are: plasm-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: chem-ph
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The categories of this paper are: acc-phys