边对行星系统的伪zodi问题
The Pseudo-zodi Problem for Edge-on Planetary Systems
摘要：
未来对位于宜居带的太阳系外地球大小的行星的直接观测可能会受到一种令人担忧的噪音源的阻碍，这种噪音源是反射星光的外黄道尘埃。目前正在进行中红外线调查，以限制附近恒星周围宜居带中的外黄带尘埃的数量。然而，在可见光波段，另一种尘埃来源，这些调查看不见，可能占主导地位的exozodiacal灰尘。对于从侧面观测到的系统，如果尘埃颗粒具有足够的前向散射，则正面光学厚度为10^-7且超过约5天文单位的尘埃云可以模拟出具有相同光学厚度的外黄道尘埃云的表面亮度。我们认为，通过坡印廷-罗伯逊阻力从冷碎片带向内迁移的尘埃可能会产生这种“伪黄道”效应，可能使其成为50%的外黄道云。我们将限制盘半径和散射相函数产生的效果。
英文摘要：
Future direct observations of extrasolar Earth-sized planets in the habitable zone could be hampered by a worrisome source of noise, starlight-reflecting exozodiacal dust. Mid-infrared surveys are currently underway to constrain the amount of exozodiacal dust in the habitable zones around nearby stars. However, at visible wavelengths another source of dust, invisible to these surveys, may dominate over exozodiacal dust. For systems observed near edge-on, a cloud of dust with face-on optical depth 10^-7 beyond ~5 AU can mimic the surface brightness of a cloud of exozodiacal dust with equal optical depth if the dust grains are sufficiently forward-scattering. We posit that dust migrating inward from cold debris belts via Poynting-Robertson drag could produce this "pseudo-zodiacal" effect, potentially making it ~50% as common as exozodiacal clouds. We place constraints on the disk radii and scattering phase function required to produce the effect.
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