A candidate lsim3 M Jup extrasolar planet was recently imaged by Kalas et al. using Hubble Space Telescope/Advanced Camera for Surveys and Keck II at 12farcs7 (96 AU) separation from the nearby (d = 7.7 pc) young (~200 Myr) A2V star Fomalhaut. Here, we report results from M-band (4.8 μm) imaging of Fomalhaut on 2006 December 5 using the Clio IR imager on the 6.5 m MMT with the adaptive secondary mirror. Our images are sensitive to giant planets at orbital radii comparable to the outer solar system (~10-40 AU). Comparing our 5σ M-band photometric limits to theoretical evolutionary tracks for substellar objects, our results rule out the existence of planets with masses >2 M Jup from ~13 to 40 AU and objects >13 M Jup from ~8 to 40 AU.Observations reported here were obtained at the MMT Observatory, a joint facility of the University of Arizona and the Smithsonian Institution.
The Astrophysical Journal
- Pub Date:
- June 2009
- instrumentation: adaptive optics;
- planetary systems;
- stars: individual: Fomalhaut;
- 4 pages, 3 figures, submitted to ApJL, uses emulateapj.sty