Biology
Scientific paper
May 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aas...206.0601w&link_type=abstract
American Astronomical Society Meeting 206, #06.01; Bulletin of the American Astronomical Society, Vol. 37, p.435
Biology
Scientific paper
The debris disk around the ˜300 Myr old star HIP 8920 (SAO 75016) is extremely dusty at ˜1 AU from the star (Zuckerman et al. 2004, BAAS, 205, 1554). We present mid-infrared spectra (8--13 microns) of its dust taken with the Long Wavelength Spectrograph at Keck Observatory and the MICHELLE spectrograph at Gemini Observatory. The dust exhibits a very strong silicate feature with broad peaks at 10 and 11 microns. We attempt to fit the spectra, assuming the disk is optically thin, with the sum of emission from pyroxenes and olivines of various sizes. The shape of the 8--13 micron excess indicates a mixture of amorphous and crystalline grains of sizes 0.1 -- 2.5 micron and at temperatures of ˜300 K. While the interstellar medium, and therefore presumably proto-planetary disks, are dominated by small grains, this star is too old for the dust to be primordial. The very high line-to-continuum ratio, produced by the abundant small grains, is more similar to Solar System comet spectra than to debris disks or the total Zodiacal dust (Reach et al. 2003, Icarus, 164, 384; Jura et al. 2004, ApJS, 154, 453). We compare our spectra to that of comets and T Tauri stars to try to understand the origin of this debris.
This work is supported in part by the NASA Astrobiology Institute
Becklin Eric E.
Song Inseok
Weinberger Alycia J.
Zuckerman Ben
No associations
LandOfFree
The Silicate Spectrum of HIP 8920's Debris Dust does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The Silicate Spectrum of HIP 8920's Debris Dust, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Silicate Spectrum of HIP 8920's Debris Dust will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1683618