English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We report observations of a stellar occultation by the classical Kuiper beltobject (50000) Quaoar occurred on 28 June 2019. A single-chord high-cadence (2Hz) photometry dataset was obtained with the Tomo-e Gozen CMOS camera mountedon the 1.05 m Schmidt telescope at Kiso Observatory. The obtained ingress andegress data do not show any indication of atmospheric refraction and allow toset new $1\sigma$ and $3\sigma$ upper limits of 6 and 16 nbar, respectively,for the surface pressure of a pure methane atmosphere. These upper limits arelower than the saturation vapor pressure of methane at Quaoar's expected meansurface temperature ($T \sim 44$ K) and imply the absence of a $\sim$10nbar-level global atmosphere formed by methane ice on Quaoar's surface.

New constraint on the atmosphere of (50000) Quaoar from a stellar occultation