Keck/OSIRIS Paβ High-contrast Imaging and Updated Constraints on PDS 70b

November 2021 • 2021AJ....162..214U

Authors • Uyama, Taichi • Xie, Chen • Aoyama, Yuhiko • Beichman, Charles A. • Hashimoto, Jun • Dong, Ruobing • Hasegawa, Yasuhiro • Ikoma, Masahiro • Mawet, Dimitri • McElwain, Michael W. • Ruffio, Jean-Baptiste • Wagner, Kevin R. • Wang, Jason J. • Zhou, Yifan

Abstract • We present a high-contrast imaging search for Paβ line emission from protoplanets in the PDS 70 system with Keck/OSIRIS integral field spectroscopy. We applied the high-resolution spectral differential imaging technique to the OSIRIS J-band data but did not detect the Paβ line at the level predicted using the parameters of Hashimoto et al. (2020). This lack of Paβ emission suggests the MUSE-based study may have overestimated the line width of Hα. We compared our Paβ detection limits with the previous Hα flux and Hβ limits and estimated A_V to be ~0.9 and 2.0 for PDS 70 b and c, respectively. In particular, PDS 70 b's A_V is much smaller than implied by high-contrast near-infrared studies, which suggests the infrared-continuum photosphere and the hydrogen-emitting regions exist at different heights above the forming planet.

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• SIMBAD https://simbad.u-strasbg.fr/simbad/sim-ref?querymethod=bib&simbo=on&submit=submit+bibcode&bibcode=2021AJ....162..214U
• PDF https://iopscience.iop.org/article/10.3847/1538-3881/ac2739/pdf
• PREPRINT http://arxiv.org/abs/2109.06930
• DATA https://archive.stsci.edu/mastbibref.php?bibcode=2021AJ....162..214U
• DATA https://hst.esac.esa.int/ehst/#/pages/search;bibcode=2021AJ....162..214U
• DATA https://irsa.ipac.caltech.edu/bibdata/2021/U/2021AJ....162..214U.html
• ELECTR https://doi.org/10.3847/1538-3881/ac2739