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Detecting Exoplanets with the New Worlds Observer: The Problem of Exozodiacal DustDust coming from asteroids and comets will strongly affect direct imaging and characterization of terrestrial planets in the Habitable Zones of nearby stars. Such dust in the Solar System is called the zodiacal dust (or 'zodi' for short). Higher levels of similar dust are seen around many nearby stars, confined in disks called debris disks. Future high-contrast images of an Earth-like exoplanet will very likely be background-limited by light scattered of both the local Solar System zodi and the circumstellar dust in the extrasolar system (the exozodiacal dust). Clumps in the exozodiacal dust, which are expected in planet-hosting systems, may also be a source of confusion. Here we discuss the problems associated with imaging an Earth-like planet in the presence of unknown levels of exozodiacal dust. Basic formulae for the exoplanet imaging exposure time as function of star, exoplanet, zodi, exozodi, and telescope parameters will be presented. To examine the behavior of these formulae, we apply them to the New Worlds Observer (NWO) mission. NWO is a proposed 4-meter UV/optical/near-IR telescope, with a free flying starshade to suppress the light from a nearby star and achieve the high contrast needed for detection and characterization of a terrestrial planet in the star's Habitable Zone. We find that NWO can accomplish its science goals even if exozodiacal dust levels are typically much higher than the Solar System zodi level. Finally, we highlight a few additional problems relating to exozodiacal dust that have yet to be solved.
Document ID
20090005026
Document Type
Conference Paper
Authors
Roberge, A. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Noecker, M. C. (Ball Corp. United States)
Glassman, T. M. (Next Generation Space Telescope United States)
Oakley, P.
Turnbull, M. C.
Date Acquired
August 24, 2013
Publication Date
January 4, 2009
Subject Category
Astronomy
Distribution Limits
Public
Copyright
Other