C. H. Chen and M. Jura 2001 ApJ 560 L171 doi:10.1086/324057
C. H. Chen1 and M. Jura1
Show affiliationsWe have used the Keck I telescope to image at 11.7 and 17.9 μm the dust emission around ζ Leporis, a main-sequence A-type star at 21.5 pc from the Sun with an infrared excess. The excess is at most marginally resolved at 17.9 μm. The dust distance from the star is probably ≤6 AU, although some dust may extend to 9 AU. The mass of observed dust is ~1022 g. Since the lifetime of dust particles is about 104 yr because of the Poynting-Robertson effect, we robustly estimate at least 4 × 1026 g must reside in parent bodies, which may be asteroids if the system is in a steady state and has an age of ~300 Myr. This mass is approximately 200 times that contained within the main asteroid belt in our solar system.
circumstellar matter; planetary systems; stars: individual (HR 1998)
Issue 2 (2001 October 20)
Received 2001 June 18, accepted for publication 2001 September 13
Published 2001 September 28
C. H. Chen and M. Jura 2001 ApJ 560 L171
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