IRS View of a Planetary Collision in the Pleiades

Details IRS View of a Planetary Collision in the Pleiades IRS View of a Planetary Collision in the Pleiades

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sptz.prop50228s&link_type=abstract

Spitzer Proposal ID #50228

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Scientific paper

Recently, we identified a sun-like Pleiades member, HD 23514, hosting a huge quantity of warm dust grains. Next to BD+20 307 (a field sun-like star), HD 23514 is currently the second dustiest, adolescent-age, star known with warm excess IR emission. Very short removal timescales of warm dust grains and adolescent ages of these two stars (>~100 Myr) indicate that the very dusty, warm excess, phenomenon is a transient event. A catastrophic collision between planetary embryos or planets is the most plausible origin of so much warm dust and such a collision mimics the postulated Moon-creation event in our terrestrial system. But the N-band spectra of BD+20 307 and HD 23514 appear very different, with peculiar emission at HD 23514 peaking at ~9 microns, a peak wavelength hardly seen among young stars and other main sequence excess stars. The strange N-band spectrum may point to an extra-ordinary condition around HD 23514 such as a very thick crust of a planet, a freakish chemical composition, or shocked silicates from a planetary collision. An IRS spectrum covering the 5-35um spectral range, rather than the highly restricted ground-based N-band spectrum will provide much stronger and clearer constraints on the dusty environment of HD 23514. We propose IRS observations with all four low resolution modules to obtain a diagnostic mid-IR spectrum of this rare, fascinating star.

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