High-contrast observations of brown dwarf companion HR 2562 B with the vector Apodizing Phase Plate coronagraph
Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 506:3 (2021) stab1893-
Vector-apodizing phase plate coronagraph: design, current performance, and future development [Invited].
Applied optics 60:19 (2021) D52-D72
Abstract:
Over the last decade, the vector-apodizing phase plate (vAPP) coronagraph has been developed from concept to on-sky application in many high-contrast imaging systems on 8 m class telescopes. The vAPP is a geometric-phase patterned coronagraph that is inherently broadband, and its manufacturing is enabled only by direct-write technology for liquid-crystal patterns. The vAPP generates two coronagraphic point spread functions (PSFs) that cancel starlight on opposite sides of the PSF and have opposite circular polarization states. The efficiency, that is, the amount of light in these PSFs, depends on the retardance offset from a half-wave of the liquid-crystal retarder. Using different liquid-crystal recipes to tune the retardance, different vAPPs operate with high efficiencies (${\gt}96\%$) in the visible and thermal infrared (0.55 µm to 5 µm). Since 2015, seven vAPPs have been installed in a total of six different instruments, including Magellan/MagAO, Magellan/MagAO-X, Subaru/SCExAO, and LBT/LMIRcam. Using two integral field spectrographs installed on the latter two instruments, these vAPPs can provide low-resolution spectra (${\rm{R}} \sim 30$) between 1 µm and 5 µm. We review the design process, development, commissioning, on-sky performance, and first scientific results of all commissioned vAPPs. We report on the lessons learned and conclude with perspectives for future developments and applications.Origins space telescope: from first light to life
Experimental Astronomy Springer Nature 51:3 (2021) 595-624
First Detection of Hydroxyl Radical Emission from an Exoplanet Atmosphere: High-dispersion Characterization of WASP-33b Using Subaru/IRD *Based on data collected at the Subaru Telescope, which is operated by the National Astronomical Observatory of Japan.
The Astrophysical Journal Letters American Astronomical Society 910:1 (2021) l9
Prospects for characterizing the haziest sub-Neptune exoplanets with high-resolution spectroscopy
Astronomical Journal IOP Publishing 160:5 (2020) 160-198