Disappearance of stellar debris disks around main-sequence stars after 400 million years
Article Abstract:
Infrared observations show that most stars younger than 300 million years have dust disks, while most older than 400 million years do not. It is uncertain what causes a small number of disks to survive longer than others. The reason why disks with an age of a few hundred million years are seen if dust particles are removed within one million years is probably that there is a continuous supply of new dust.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1999
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Sifting through the debris
Article Abstract:
The observational estimates of the make-up of the Solar System's most distant components, the trans-neptunian objects, which call for a rethink of models of the way these bodies are formed, are presented. Observations indicate that the trans-neptunian debris field in fact contains many more small planetesimals of between 10 and 100 metres across than theorists had predicted.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2006
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Occultation of X-rays from Scorpius X-1 by small trans-neptunian objects
Article Abstract:
The discovery of occultation events at millisecond timescales in the X-ray light curve of Scorpius X-1 is reported. The estimated sizes of these occulting trans-neptunian objects (TNOs) are less than of equal to 100 m and their abundance is in line with an extrapolation of the distribution of sizes of larger TNOs.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2006
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