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Topic: Nulling interferometry

	Laputan Logic
		One of the great difficulties of directly detecting extra-solar planets with space-based infrared nulling interferometry is the requirement to have long baselines.
		Nulling interferometry works by taking the signal from two or more telescopes and combining them in such a way as to cancel out the light comes from the star that the planets are orbiting around.
		This is important because stars are (depending on the wavelengths used) anywhere between a million and a billion times brighter than the planets which orbit them and the most interesting planets to study are the ones that, just like the earth, lie in the so-called "habitable zone" close to the star.
	www.laputanlogic.com /articles/2003/12 (1619 words)

	Planet Quest: Missions - Keck Interferometer
		To this end, measurements taken by the Keck Interferometer will assist in planning the specifications of the TPF mission.
		To measure dust emissions, Keck Interferometer will use an interferometric technique called "nulling" interferometry.
		This technique cancels out light from a star in order that its surrounding dust emission can be measured.
	planetquest.jpl.nasa.gov /Keck/keck_science.cfm (652 words)

	Extrasolar Planets \| The Astrobiology Web \| Your Online Guide to the Living Universe
		The goals for this mission is for the first time to detect terrestial planets in orbit around other stars than our Sun and to allow, also for the first time, high spatial resolution imaging in the approximately 6-30 micrometer wavelength region.
		Darwin: The search for other worlds Darwin is a proposed extrasolar planet detection program that will use five or six 1m class telescopes, which together will form a nulling (Bracewell) interferometer.
		PLANET - Probing Lensing Anomalies NETwork This website described a proposed method of extrasolar planetary detection that uses gravitational microlensing caused by large distant objects as an optical telescope of sorts that could allow planets down to the size of Earth to be detected at great distances.
	www.astrobiology.com /extrasolar.html (1465 words)

	extra solar planets [Archive] - Bad Astronomy and Universe Today Forum (Site not responding. Last check: 2007-09-10)
		Rather than astrometry (seeing if the stars change position in the sky), Marcy and co. use Doppler shift detection, which is vastly harder to do but less susceptible to systematic errors.
		Interferometry is going to be coming into play in the near future, which should lead to a huge increase in planet discoveries.
		If it were not for this 'nulling', the starlight would overwhelm the planet's feeble glow.
	www.bautforum.com /archive/index.php/t-76.html (2459 words)

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