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A near-infrared interferometric survey of debris-disk stars.udIV. An unbiased sample of 92 southern stars observed in H bandudwith VLTI/PIONIER

机译:碎片盘星的近红外干涉测量。 udIV。在H波段 ud中观测到的92个南方恒星的无偏样本与VLTI / PIONIER

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摘要

Context. Detecting and characterizing circumstellar dust is a way to study the architecture and evolution of planetary systems. Cold dust in debris disks only traces the outer regions. Warm and hot exozodiacal dust needs to be studied in order to trace regions close to the habitable zone.ududAims. We aim to determine the prevalence and to constrain the properties of hot exozodiacal dust around nearby main-sequence stars.ududMethods. We searched a magnitude-limited (H ≤ 5) sample of 92 stars for bright exozodiacal dust using our VLTI visitor instrument PIONIER in the H band. We derived statistics of the detection rate with respect to parameters, such as the stellar spectral type and age or the presence of a debris disk in the outer regions of the systems. We derived more robust statistics by combining our sample with the results from our CHARA/FLUOR survey in the K band. In addition, our spectrally dispersed data allowed us to put constraints on the emission mechanism and the dust properties in the detected systems.ududResults. We find an overall detection rate of bright exozodiacal dust in the H band of 11% (9 out of 85 targets) and three tentative detections. The detection rate decreases from early type to late type stars and increases with the age of the host star. We do not confirm the tentative correlation between the presence of cold and hot dust found in our earlier analysis of the FLUOR sample alone. Our spectrally dispersed data suggest that either the dust is extremely hot or the emission is dominated by the scattered light in most cases. The implications of our results for the target selection of future terrestrial planet-finding missions using direct imaging are discussed.
机译:上下文。检测和表征星尘是研究行星系统的结构和演化的一种方法。碎片盘中的冷尘仅能追踪到外部区域。为了追踪靠近宜居区域的区域,需要研究温暖和炎热的足外尘。 ud ud我们的目标是确定患病率,并限制附近主要序列恒星周围的炎热的洋外odi尘埃的性质。 ud udMethods。我们使用我们的VLTI访客仪器PIONIER在H波段中搜索了92个恒星的幅度限制(H≤5)样本,寻找明亮的十二生肖尘埃。我们得出了关于参数检测率的统计数据,例如恒星光谱类型和年龄或系统外部区域中是否存在碎片盘。通过将样本与K波段CHARA / FLUOR调查的结果相结合,我们得出了更可靠的统计数据。此外,我们的光谱分散数据使我们能够对检测到的系统中的发射机理和粉尘特性施加约束。 ud udResults。我们发现在H波段中,明亮的外生珠尘的总检出率为11%(85个目标中的9个),并进行了3次试探。检出率从早期类型的星到晚期类型的星降低,并随着宿主星的年龄而增加。我们没有确认在我们单独对FLUOR样品的早期分析中发现的冷尘和热尘之间的暂时相关性。我们的光谱分散数据表明,在大多数情况下,要么粉尘非常热,要么是由散射光主导。讨论了我们的结果对使用直接成像对未来地面行星寻找任务的目标选择的影响。

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