Keck/OSIRIS paβ high-contrast imaging and updated constraints on PDS 70b

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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Scopus citations


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 AV to be ∼0.9 and 2.0 for PDS 70 b and c, respectively. In particular, PDS 70 b's AV is much smaller than implied by highcontrast near-infrared studies, which suggests the infrared-continuum photosphere and the hydrogen-emitting regions exist at different heights above the forming planet.

Original languageEnglish (US)
Article number214
JournalAstronomical Journal
Issue number5
StatePublished - Nov 1 2021

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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