The VAMPIRES instrument: imaging the innermost regions of protoplanetary discs with polarimetric interferometry
The VAMPIRES instrument: imaging the innermost regions of protoplanetary discs with polarimetric interferometry
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VAMPIRES 仪器：利用偏振干涉测量法对原行星盘的最内部区域进行成像
DOI：
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发表时间：
2014
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通讯作者：
F. Martinache
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作者：
B. Norris;P. Tuthill;N. Jovanovic;G. Schworer;O. Guyon;P. Stewart;F. Martinache
对原行星盘的直接成像有望为行星形成的复杂过程提供关键的见解。然而，对这种盘的最内部区域（对行星形成至关重要的区域）进行成像对于传统的观测技术（例如近红外成像和日冕照相术）来说是具有挑战性的，因为所涉及的波长相对较长，并且被日冕掩模遮蔽的区域。在这里，我们介绍了一种新的仪器-吸血鬼-它结合了非冗余孔径掩蔽干涉与差分偏振直接成像这个以前无法访问的最里面的区域。通过使用光盘中的灰尘散射光的偏振，提供精确的差分校准的干涉仪vibrium和关闭阶段，VAMPIRES允许直接成像和超过望远镜衍射极限。集成到斯巴鲁望远镜的SCExAO系统中，VAMPIRES在可见光波长（偏振度高）下工作，同时允许由CRANIAO进行同步红外观测。在这里，我们描述了仪器设计和独特的观测技术，并提出了第一次在天空调试观测的结果，验证了出色的能见度和关闭阶段的精度，然后用于项目预期的科学性能指标。
Direct imaging of protoplanetary disks promises to provide key insight into the complex sequence of processes by which planets are formed. However imaging the innermost region of such disks (a zone critical to planet formation) is challenging for traditional observational techniques (such as near-IR imaging and coronagraphy) due to the relatively long wavelengths involved and the area occulted by the coronagraphic mask. Here we introduce a new instrument -- VAMPIRES -- which combines non-redundant aperture-masking interferometry with differential polarimetry to directly image this previously inaccessible innermost region. By using the polarisation of light scattered by dust in the disk to provide precise differential calibration of interferometric visibilities and closure phases, VAMPIRES allows direct imaging at and beyond the telescope diffraction limit. Integrated into the SCExAO system at the Subaru telescope, VAMPIRES operates at visible wavelengths (where polarisation is high) while allowing simultaneous infrared observations conducted by HICIAO. Here we describe the instrumental design and unique observing technique and present the results of the first on-sky commissioning observations, validating the excellent visibility and closure phase precision which are then used to project expected science performance metrics.