Keck/NIRSPEC Studies of He i in the Atmospheres of Two Inflated Hot Gas Giants Orbiting K Dwarfs: WASP-52b and WASP-177b

  title={Keck/NIRSPEC Studies of He i in the Atmospheres of Two Inflated Hot Gas Giants Orbiting K Dwarfs: WASP-52b and WASP-177b},
  author={James Kirk and Leonardo A. dos Santos and Mercedes L{\'o}pez-Morales and Munazza K. Alam and Antonija Oklop{\vc}i{\'c} and Morgan MacLeod and Li Zeng and George Zhou},
  journal={The Astronomical Journal},
We present the detection of neutral helium at 10833 Å in the atmosphere of WASP-52b and tentative evidence of helium in the atmosphere of the grazing WASP-177b, using high-resolution observations acquired with the NIRSPEC instrument on the Keck II telescope. We detect excess absorption by helium in WASP-52b’s atmosphere of 3.44% ± 0.31% (11σ), or equivalently 66 ± 5 atmospheric scale heights. This absorption is centered on the planet’s rest frame (Δv = 0.00 ± 1.19 km s−1). We model the planet’s… 

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