Infrared Speckle Interferometry - a Sensitive Technique for Physical Measurements of Unseen Companions to Nearby Stars
Infrared speckle interferometry combines the full resolving power of large telescopes with high photometric sensitivity over the wavelength range 2.2 to 12 microns. Seeing fluctuations limit measurement precision. Astrometric companions have been detected with angular separations ≥0.1 arcsec and magnitude differences ≤3.7 mag. In some cases, orbital motion is detected. A method of "shift-and-add" enables detection of substellar (0.04 to 0.08 M_sun;) companions. Future improvements involving detector arrays and seeing monitors are discussed.
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