The Exozodiacal Dust Problem for Direct Observations of ExoEarths

Abstract

Debris dust in the habitable zones of stars - otherwise known as exozodiacal dust - comes from extrasolar asteroids and comets and is thus an expected part of a planetary system. Background flux from the Solar System's zodiacal dust and the exozodiacal dust in the target system is likely to be the largest source of astrophysical noise in direct observations of terrestrial planets in the habitable zones of nearby stars. Furthermore, dust structures like clumps, thought to be produced by dynamical interactions with exoplanets, are a possible source of confusion. In this paper, we qualitatively assess the primary impact of exozodical dust on high-contrast direct imaging at optical wavelengths, such as would be performed with a coronagraph. Then we present the sensitivity of previous, current, and near-term facilities to thermal emission from debris dust at all distances from nearby solar-type stars, as well as our current knowledge of dust levels from recent surveys. Finally, we address the other method of detecting debris dust, through high-contrast imaging in scattered light. This method is currently far less sensitive than thermal emission observations, but provides high spatial resolution for studying dust structures. This paper represents the first report of NASA's Exoplanet Exploration Program Analysis Group (ExoPAG).

21 pages, 5 figures, 2 tables. Accepted for publication in PASP 2012-06-07

References in corpus (14)

• Debris disks around Sun-like stars
• Spitzer IRS Spectroscopy of IRAS-Discovered Debris Disks
• Nearby debris disk systems with high fractional luminosity reconsidered
• HST/ACS Multiband Coronagraphic Imaging of the Debris Disk around Beta Pictoris
• Circumstellar material in the Vega inner system revealed by CHARA/FLUOR
• STIS Imaging of the HR 4796A Circumstellar Debris Ring
• Discovery of an 86 AU Radius Debris Ring Around HD 181327
• Exo--Zodiacal Dust Levels for Nearby Main Sequence Stars
• VLT/NACO Polarimetric Differential Imaging of HD100546 - Disk Structure and Dust Grain Properties between 10-140 AU
• IRS Spectra of Solar-Type Stars: \break A Search for Asteroid Belt Analogs
• Images of the Extended Outer Regions of the Debris Ring Around HR 4796 A
• An improved model of the Edgeworth-Kuiper debris disk
• Nulling interferometry: impact of exozodiacal clouds on the performance of future life-finding space missions
• Improving Interferometric Null Depth Measurements using Statistical Distributions: Theory and First Results with the Palomar Fiber Nuller

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