Japan Geoscience Union Meeting 2018

Presentation information

[JJ] Poster

P (Space and Planetary Sciences) » P-CG Complex & General

[P-CG22] New Developments of Planetary Sciences with ALMA

Wed. May 23, 2018 3:30 PM - 5:00 PM Poster Hall (International Exhibition Hall7, Makuhari Messe)

convener:Takayuki Muto(Division of Liberal Arts, Kogakuin University), Munetake Momose(The College of Science, Ibaraki University), Hideo Sagawa(京都産業大学理学部, 共同), Masumi Shimojo(National Astronomical Observatory of Japan)

[PCG22-P05] On the spatial distribution of Neptune's stratospheric HCN obtained with ALMA

*Takahiro IINO1, Hideo Sagawa2, Takashi Tsukagoshi3 (1.Nature and Science Museum, Tokyo University of Agriculture and Technology, 2.Kyoto Sangyo University, 3.Ibaraki Univerisity)

Keywords:ALMA, Planetary atmosphere, Neptune

We present spatially resolved hydrogen cyanide (HCN) (J=4--3) molecular emission spectra and its three-dimensitonal distribution in the Neptune's stratosphere.
We analyzed a data obtained from the archive of the Atacama Large Millimeter-submillimeter Array (ALMA) observed with a band-7 receiver(Project ID: 2015.1.01471.S).
Synthesized beam size was 0.42 x 0.38 arcsec, synthesized beam is fine enough to resolve Neptune's 2.24 arcsec diameter disk.
The integrated intensity map of HCN shows a latitudinal gradient that has highest and lowest peak at the equator and 60S, respectively.
Radiative transfer analysis showed that column densities measures at the equator shows 1.5 times higher value than that of measured at 60S.
The derived HCN spatial distribution is consistent with the previously proposed stratospheric global circulation, which has upwelling and downwelling at 60S and the equator, respectively.