Details

Autor(en) / Beteiligte

• Arimatsu, Ko
• Ohsawa, Ryou
• Hashimoto, George L.
• Urakawa, Seitaro
• Takahashi, Jun
• Tozuka, Miyako
• Itoh, Yoichi
• Yamashita, Misato
• Usui, Fumihiko
• Aoki, Tsutomu
• Arima, Noriaki
• Doi, Mamoru
• Ichiki, Makoto
• Ikeda, Shiro
• Ita, Yoshifusa
• Kasuga, Toshihiro
• Kobayashi, Naoto
• Kokubo, Mitsuru
• Konishi, Masahiro
• Maehara, Hiroyuki
• Matsunaga, Noriyuki
• Miyata, Takashi
• Morii, Mikio
• Morokuma, Tomoki
• Motohara, Kentaro
• Nakada, Yoshikazu
• Okumura, Shin-ichiro
• Sako, Shigeyuki
• Sarugaku, Yuki
• Sato, Mikiya
• Shigeyama, Toshikazu
• Soyano, Takao
• Takahashi, Hidenori
• Tarusawa, Ken'ichi
• Tominaga, Nozomu
• Watanabe, Jun-ichi
• Yamashita, Takuya
• Yoshikawa, Makoto

Titel

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

Ist Teil von

• The Astronomical journal, 2019-12, Vol.158 (6), p.236

Ort / Verlag

Madison: The American Astronomical Society

Erscheinungsjahr

2019

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• 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 1 and 3 upper limits of 6 and 16 nbar, respectively, to be set for the surface pressure of a pure methane atmosphere. These upper limits are lower than the saturation vapor pressure of methane at Quaoar's expected mean surface temperature (T ∼ 44 K) and imply the absence of a ∼10 nbar-level global atmosphere formed by methane ice on Quaoar's surface.