Optimized beam-combination schemes for each channel for PRIMA

Details Optimized beam-combination schemes for each channel for PRIMA Optimized beam-combination schemes for each channel for PRIMA

Feb 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003spie.4838..496l&link_type=abstract

Interferometry for Optical Astronomy II. Edited by Wesley A. Traub. Proceedings of the SPIE, Volume 4838, pp. 496-502 (2003).

Astronomy and Astrophysics

Astronomy

1

Scientific paper

With the imaging and astrometric facilities coming up as the next major leaps forward in interferometry at the VLT we examine options for beam combination of multiple beams, both in the Science Channel and in the Reference Channel. We look at the science we expect to become feasible as soon as phase referencing becomes available, and the hopes for the future of this facility with the advent of more ATs and next-generation beam combiners. Contrary to "conventional wisdom," the fringe tracking accuracy for a multi-element array is not worse than for a single-baseline interferometer with equal telescope size. We discuss applications of phase referencing to observations of faint targets, and a double-differential phase technique for spectroscopy of extrasolar planets. We point out that phase-referenced methods have some important advantages compared with the closure-phase technique for imaging of extended sources.

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