Keck/OSIRIS Pa\ensuremathβ High-contrast Imaging and Updated Constraints on PDS 70b - Archive ouverte HAL Access content directly
Journal Articles aj Year : 2021

Keck/OSIRIS Pa\ensuremathβ High-contrast Imaging and Updated Constraints on PDS 70b

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1
Taichi Uyama
Yuhiko Aoyama
  • Function : Author
Charles A. Beichman
  • Function : Author
Jun Hashimoto
Ruobing Dong
Yasuhiro Hasegawa
  • Function : Author
Masahiro Ikoma
Dimitri Mawet
Michael W. Mcelwain
  • Function : Author
Jean-Baptiste Ruffio
  • Function : Author
Kevin R. Wagner
  • Function : Author
Jason J. Wang
  • Function : Author
Yifan Zhou
  • Function : Author

Abstract

We present a high-contrast imaging search for Pa\ensuremathβ 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 Pa\ensuremathβ line at the level predicted using the parameters of Hashimoto et al. (2020). This lack of Pa\ensuremathβ emission suggests the MUSE-based study may have overestimated the line width of H\ensuremathα. We compared our Pa\ensuremathβ detection limits with the previous H\ensuremathα flux and H\ensuremathβ limits and estimated A_V to be \raisebox-0.5ex~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.

Dates and versions

hal-03585130 , version 1 (23-02-2022)

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Taichi Uyama, Chen Xie, Yuhiko Aoyama, Charles A. Beichman, Jun Hashimoto, et al.. Keck/OSIRIS Pa\ensuremathβ High-contrast Imaging and Updated Constraints on PDS 70b. aj, 2021, 162 (5), pp.214. ⟨10.3847/1538-3881/ac2739⟩. ⟨hal-03585130⟩
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