Exoplanet Imaging with CHARIS and Future Synergies with WFIRST CGI

[摘要] The principal science goal of directly imaging exoplanets is spectroscopy. At Subaru, the SCExAO instrument uses the CHARIS integral field spectrograph (IFS) to take spectra of young, self-luminous companions and disks in the near-infrared. CHARIS provides both R70 and R20 spectral resolutions across the J, H, and K bands. Of the two, R20 is the primary observing mode, which provides both excellent spectral coverage of the companions and a larger bandpass for advanced speckle subtraction techniques. Looking to the future, the WFIRST CoronaGraph Instrument (CGI) is a technology demonstration for future missions whose spectroscopic techniques are rooted in what has been demonstrated at ground observatories. CGI will reach very high contrast in broadband light with advanced wavefront control and coronagraphy techniques, paving the way for characterizing Earth-like planets. The spectral resolution of CGI spectroscopic modes is R50 with 15% bandpasses from 600 to 970nm. The calibration, speckle subtraction, and spectral extraction methods for CGI spectroscopy has a strong heritage from techniques developed for SCExAO+CHARIS. We discuss such synergies between CHARIS and CGI characterization capabilities from both a science and engineering perspective, including the new Wollaston polarization upgrade to CHARIS.

[发布日期] 2019-11-17

[学科分类] 原子、分子光学和等离子物理

[关键词] CONTROL SYSTEMS DESIGN;CORONAGRAPHS;EXTRASOLAR PLANETS;IMAGING TECHNIQUES;PLANET DETECTION;PROTOPLANETARY DISKS;SPECTRAL RESOLUTION;SPECTROSCOPY;WAVE FRONTS;WIDE-FIELD INFRARED SURVEY TELESCOPE (WFIRST)