Are Dust Disks and Circumstellar Gas Around Young A Stars Unrelated Phenomena?

Details Are Dust Disks and Circumstellar Gas Around Young A Stars Unrelated Phenomena? Are Dust Disks and Circumstellar Gas Around Young A Stars Unrelated Phenomena?

Jun 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sptz.prop20204c&link_type=abstract

Spitzer Proposal ID #20204

Physics

Scientific paper

The first three IRAS discovered protoplanetary/planetary candidates (Vega, Beta Pictoris, and Alpha PsA) are all main-sequence A stars. Subsequent studies strongly suggest that Beta Pictoris could be an early solar system. If the high-density, high-velocity circumstellar (CS) gas falling toward Beta Pic were fueled by grazing comets or ongoing erosion of debris located close to the star, we would expect to find evidence for warm dust in all Beta Pic-like systems. We have carried out detailed studies of the CS environments of all nearby A stars. We have studied not only their CS dust but also the characteristics of their CS gas, using visual and UV spectroscopy. Based on our ground-based, IUE, HST, and FUSE observations, we have identified about a dozen main-sequence A stars with CS gas. Among them, several have dynamic CS gas (infall and outflow similar to that observed around Beta Pic) but no IRAS detectable infrared excess. Since Spitzer can probe these systems at least ten times more sensitively than IRAS, we propose to analyze the available archival Spitzer data of nearby A stars with detectable CS gas. Our goals are (1) to probe the link between the dust and gas of A stars' circumstellar disks, which can provide important constraints on models of disk evolution and planet formation, and (2) to better understand main-sequence A stars in general based on our combined observations in IR, visual, UV, and far-UV.

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