Optical to Submillimeter Imaging of the Fomalhaut and HR 8799 Planetary Systems.
Abstract
We present new observations of the Fomalhaut and HR 8799 planetary systems. The Fomalhaut data include recent efforts to recover Fomalhaut b in the optical with HST/WFPC2, and at infrared wavelengths with Keck, Gemini and HST/WFC3/IR. For HR 8799, we present the results of our submillimeter campaign to determine the inclination and orientation of the dust disk. A tentative result is that dust thermal emission is spatially resolved using the APEX/LABOCA instrument at 870 microns. The HR 8799 disk has a projected elliptical morphology roughly 40 arc seconds in diameter, with major axis at position angle PA 45 degrees. Assuming an intrinsically circular structure, the aspect ratio of isocontours gives a plausible disk inclination in the range i = 20 - 50 degrees away from face-on, where the lower range is consistent with other published data. If confirmed, the value PA 45 changes the deprojected location of the middle planet significantly for larger values of i. For i<30, the system is consistent with a 1:2:4 double resonance. For i>30, the innermost planets d and c approach a 2:5 resonance, analogous to our Jupiter and Saturn, whereas the two outermost planets c and b are closer to a 2:3 resonance, analogous to Neptune and Pluto.
- Publication:
-
American Astronomical Society Meeting Abstracts #215
- Pub Date:
- January 2010
- Bibcode:
- 2010AAS...21537707K