Nuller
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A nuller is an optical instrument, e.g., a beam combiner for nulling interferometry , used to block or cancel out a strong source so that fainter signals near that source can be observed. This is typically useful to detect off-axis exoplanet or exozodiacal dust by interferometrically nulling out the on-axis parent star. The VLT interferometer’s visiting instrument Asgard's submodule NOTT (Nulling Observations of exoplaneTs and dusT) contains such a nuller to combine four telescope signals to perform nulling interferometry .
A nuller is an optical instrument, e.g., a beam combiner for nulling interferometry , used to block or cancel out a strong source so that fainter signals near that source can be observed. This is typically useful to detect off-axis exoplanet or exozodiacal dust by interferometrically nulling out the on-axis parent star. The VLT interferometer’s visiting instrument Asgard's submodule NOTT (Nulling Observations of exoplaneTs and dusT) contains such a nuller to combine four telescope signals to perform nulling interferometry . ==Nulling interferometry== Nulling interferometry evolved from traditional stellar interferometry. The key difference is that it induces a 180-degree phase shift, for example, in one beam of a two-telescope interferometer. This creates destructive interference on the optical axis (where the star is) and constructive interference for off-axis objects (like planets). A technique initially proposed by Australian-American astronomer Ronald N. Bracewell in 1978 . A different technique is called a coronagraph, using a physical obstacle to block the unwanted signals. ==See also== Coronagraph Interferometry ==External links== Interferometric Nulling at TNO Nulling interferometer basics Tutorial on nulling interferometry Progress Toward Astronomical Nulling (Criteria governing efficacy of nulling interferometry), Chapter 10 of the Terrestrial Planet Finder (TPF): A NASA Origins Program to Search for Habitable Planets - JPL Publication 99-003, May 1999 Interactive "virtual" interferometer
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