Physics
Scientific paper
Mar 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sptz.prop50330l&link_type=abstract
Spitzer Proposal ID #50330
Physics
Scientific paper
From IRAS data, we present strong evidence for a large infrared excess above the expected photospheric flux at 12 and 25 microns for the 21.8 pc M1.5 dwarf GJ 730. This excess is caused by emitting dust with temperature of T~400 K, located very close to the star at ~0.1 AU. This hot dust is most likely associated with the destruction of planetesimals in an asteroid belt, or with dust released in the sublimation of a swarm of comets, or of one large supercomet, and would be unique. Hot dust has been found only around a few Sun-like stars (FGK) but never around a field M-dwarf. We propose to verify and study this excess with MIPS 24 microns and IRS 5-35 microns observations. This will allow a search to look for IR silicate spectral features that GJ730 is expected to have, and allow us to distinguish between the different possible interpretations (cometary/asteroidal) of the hot dust. In addition, confirming this excess, as the only reliable IRAS excess in the large sample of 280 IRAS M-dwarfs we have studied, will provide a robust determination of the frequency of warm debris disks around M-dwarfs for the first time (0.4% for our 280 star sample).
Beichman Charles
Bryden Geoff
Bryden Geoffrey
Lestrade Jean-Francois
Lisse Carey
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