The incidence of mid-infrared excesses in G and K giants

Jones, Mark H. (2008). The incidence of mid-infrared excesses in G and K giants. Monthly Notices of the Royal Astronomical Society, 387(2) pp. 845–855.

DOI: https://doi.org/10.1111/j.1365-2966.2008.13282.x

Abstract

Using photometric data from the Two-Micron All-Sky Survey (2MASS) and GLIMPSE catalogues, I investigate the incidence of mid-infrared (mid-IR) excesses (∼10 μm) in G and K stars of luminosity class III. In order to obtain a large sample size, stars are selected using a near-IR colour–magnitude diagram. Sources which are candidates for showing mid-IR excess are carefully examined and modelled to determined whether they are likely to be G/K giants. It is found that mid-IR excesses are present at a level of (1.8 ± 0.4) × 10−3. While the origin of these excesses remains uncertain, it is plausible that they arise from debris discs around these stars. I note that the measured incidence is consistent with a scenario in which dust lifetimes in debris discs are determined by Poynting–Robertson drag rather than by collisions.

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