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We propose the segmented Large Millimeter Telescope (LMT/GTM),as the largestspatial light modulator capable of producing vortex beams of integertopological charge. This observing mode could be applied for direct exoplanetsearches in the millimeter or submillimeter regimes. We studied the stabilityof the vortex structure against aberrations and diffraction effects inherent tothe size and segmented nature of the collector mirror. In the presence of loworder aberrations the focal distribution of the system remains stable. Ourresults show that these effects depend on the topological charge of the vortexand the relative orientation of the aberration with respect to the antennaaxis. Coma and defocus show no large effects in the image at the focal plane,nevertheless the system is very sensitive to astigmatism. Heat turbulence,simulated by random aberrations, shows that the system behaves in a similar wayas astigmatism dissociating the vortices. We propose the Segmented VortexTelescope as a novel approach for the detection of giant planets outsidecircumstellar disks around nearby stars. Since our results are applicable toother facilities with segmented surfaces, we suggest that this idea should beconsidered as a regular observation mode complementary to interferometricmethods.

Segmented Vortex Telescope and its Tolerance to Diffraction Effects and Primary Aberrations