The infrared excess - age relationship: debris, a NASA key project

Details The infrared excess - age relationship: debris, a NASA key project The infrared excess - age relationship: debris, a NASA key project

Mar 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999esasp.427..405s&link_type=abstract

The Universe as Seen by ISO. Eds. P. Cox & M. F. Kessler. ESA-SP 427., p. 405

Physics

8

Circumstellar Matter, Infrared: Stars, Stars: Pre-Main Sequence

Scientific paper

The DEBRIS project is primarily a survey of infrared radiation from nearby solar-like stars to establish how many display infrared emission in excess of that from the stellar photosphere and the timescale over which the excess persists. Such excess infrared emission indicates associated circumstellar material that could be the debris of planet formation. This survey used the ISOPHOT C100 detector ( te{lem96}) and the 60 and 90 μm filters to search for infrared flux around approximately 300 stellar targets with a variety of ages, masses and multiplicities. Here we present a summary of our results. The preliminary description of a drop of infrared excess as a function of age reported earlier by te*{bec98} is substantiated. Using a larger data set, better reduced data, and new age estimates, we find τpropto{age}-2. Several main sequence stars with newly discovered excesses are also discussed.

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