IRS Mapping of Attorocks

Details IRS Mapping of Attorocks IRS Mapping of Attorocks

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007sptz.prop40342h&link_type=abstract

Spitzer Proposal ID #40342

Physics

Scientific paper

IRS 14-38 um spectra have provided strong evidence for extremely small silicate dust grains in the vicinity of B-type field stars. The signature of these very small (less than 1 attogram) rocks is an unusually high temperature, given their projected distance from the exciting star. We presently have 1-dimensional images (i.e. along the LL slit) of these attorock clouds. This data indicates a temperature which is independent of projected distance from the exciting star. This is one of the key signatures of stochastic heating by single photons. If stochastic heating, rather than equilibrium heating, is at play, then the precise size of the dust grains can be deduced from detailed modeling. We propose to make a 50x200 arcsecond map of the attorock clouds around the three most prominent attorock sources. We will convert this, via our modeling, to a map of silicate dust temperature, which will definitively confirm (or deny) stochastic heating. In addition, we propose to get SL data at the position 20' W of HR 1415, where we have the strongest evidence for attorocks, to look carefully for any PAH emission, which is surprisingly absent in the SL data we do have, i.e. along the SL slit perpendicular to the LL slit.

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