Closure on the IRAS "Big Four": A High Contrast Study of Epsilon Eridani's Dust Belt in Scattered Light.

Details Closure on the IRAS "Big Four": A High Contrast Study of Epsilon Eridani's Dust Belt in Scattered Light. Closure on the IRAS "Big Four": A High Contrast Study of Epsilon Eridani's Dust Belt in Scattered Light.

Jul 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006hst..prop10895k&link_type=abstract

HST Proposal ID #10895. Cycle 15

Physics

Scientific paper

The ACS / HRC coronagraph has now demonstrated an unmatched capability to detect dusty debris disks around bright, nearby stars. Among the "Big Four" debris disks discovered with IRAS twenty years ago, only Epsilon Eridani SpT=K2V, d=3.2 pc has yet to be targeted with ACS. Beta Pictoris, Fomalhaut and Vega have been imaged with the ACS coronagraph, with the recent detection of reflected light from Fomalhaut's dust belt Kalas, Graham & Clampin 2005. The direct detection of dust scattered light around Fomalhaut shows disk structure and asymmetry that can be directly linked to dynamical models of planetary perturbation. Here we propose to use the ACS HRC and WFC to detect Eps Eri's dust belt. A new motivation to attempt this observations arises from recent 350 micron images that reveal two dust arcs ~60 AU to the southeast and northwest of the star. Contrary to previous 850 and 450 micron maps, the northwest arc is brighter than the southeast arc, and the northwest region has not been targeted by previous STIS imaging at lower contrast. The optical detection of dust features around Eps Eri would be significant because a high resolution optical image, together with Spitzer and sub-mm images, would help anchor dynamical models of Eps Eri's planetary system, in addition to providing direct visual indications of disk-planet interactions.

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