Abstract
IRAS coadded-survey data of volume-limited samples of main sequence stars have been examined for evidence of excess far-IR flux. Of 134 systems, 25 (19%) show significant excesses at 25, 60, or 100 µm that may be due to emission from clouds of orbiting particles. The fraction with excess more luminous than 2×10−5L* is about 15%, roughly independent of spectral type. Several of the stars with excess appear to be older than 2×l09 yrs, implying that the particle cloud phenomenon is not solely a feature of young objects.
Models of three prominent clouds that have been spatially resolved (β Pic, α PsA, and α Lyr) indicate central depleted regions with radii of order 20 AU. One possible explanation for maintenance of the depleted regions is that a planet orbits at and defines each cloud’s inner boundary, sweeping up particles entering this region.
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Backman, D.E., Gillett, F.C. (1988). Iras Statistics on Main Sequence Stellar IR Excesses and Models of Circumstellar Particle Clouds. In: Marx, G. (eds) Bioastronomy — The Next Steps. Astrophysics and Space Science Library, vol 144. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-2959-3_14
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DOI: https://doi.org/10.1007/978-94-009-2959-3_14
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