S21A0029
S21A0029
HR 8799 hosts the first and most frequently-studied directly-imaged exoplanetary system. Despite the system’s critical importance, spectra for its companions from recent publications show significant disagreement. We propose ultra-deep SCExAO/CHARIS observations to clarify the JHK spectra of HR 8799 bcde. Fall 2017 SCExAO/CHARIS data without precise spectrophotometric calibration reveal HR 8799 cde at SNR = 23-100. Recent upgrades to SCExAO will yield another factor of 2-3 higher SNR for HR 8799 cde as well as new, similar-quality detections for HR 8799 b. New, precisely calibrated spectra will be easier to extract than for rival systems SPHERE and (especially) GPI. Our results will better clarify how HR 8799 bcde’s spectral properties (and thus atmospheres) differ from both field and young, low-gravity brown dwarfs as well as how they differ from one another. HR 8799 bcde will soon be extensively observed with JWST in the thermal IR; soon-to-be discovered planets from SCExAO will likely be similar. Therefore, our program will provide timely and critical comparison near-IR observations of THE benchmark directly imaged planetary system.
This document was translated from LATEX by HEVEA.