New Constraint on the Atmosphere of (50000) Quaoar from a Stellar Occultation

@article{Arimatsu2019NewCO,
  title={New Constraint on the Atmosphere of (50000) Quaoar from a Stellar Occultation},
  author={Ko Arimatsu and Ryou Ohsawa and George L. Hashimoto and Seitaro Urakawa and Jun Takahashi and Miyako Tozuka and Yoichi Itoh and Misato Yamashita and Fumihiko Usui and Tsutomu Aoki and Noriaki Arima and Mamoru Doi and Makoto Ichiki and Shiro Ikeda and Yoshifusa Ita and Toshihiro Kasuga and Naoto Kobayashi and Mitsuru Kokubo and Masahiro Konishi and Hiroyuki Maehara and Noriyuki Matsunaga and Takashi Miyata and Mikio Morii and Tomoki Morokuma and Kentaro Motohara and Yoshikazu Nakada and Shin-ichiro Okumura and Shigeyuki Sako and Yuki Sarugaku and Mikiya Sato and Toshikazu Shigeyama and Takao Soyano and Hidenori Takahashi and Ken’ichi Tarusawa and Nozomu Tominaga and Jun-ichi Watanabe and Takuya Yamashita and Makoto Yoshikawa},
  journal={The Astronomical Journal},
  year={2019},
  volume={158}
}
We report observations of a stellar occultation by the classical Kuiper Belt object (50000) Quaoar that occurred on 2019 June 28. A single-chord high-cadence (2 Hz) photometry data set was obtained with the Tomo-e Gozen CMOS camera mounted on the 1.05 m Schmidt telescope at Kiso Observatory. The obtained ingress and egress data do not show any indication of atmospheric refraction and allow new 1σ and 3σ upper limits of 6 and 16 nbar, respectively, to be set for the surface pressure of a pure… 

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