DOI: 10.1002/2015GL067451
论文题名: Constraints on an exosphere at Ceres from Hubble Space Telescope observations
作者: Roth L. ; Ivchenko N. ; Retherford K.D. ; Cunningham N.J. ; Feldman P.D. ; Saur J. ; Spencer J.R. ; Strobel D.F.
刊名: Geophysical Research Letters
ISSN: 0094-9219
EISSN: 1944-8950
出版年: 2016
卷: 43, 期: 6 起始页码: 2465
结束页码: 2472
语种: 英语
英文关键词: Ceres
; Dawn mission
; exosphere
; HST
; water vapor
Scopus关键词: Cosmology
; Luminance
; Space telescopes
; Water vapor
; Ceres
; Dawn missions
; Exosphere
; Far ultraviolet
; Geometric albedos
; Hubble space telescopes
; Resonant scattering
; Statistical uncertainty
; Ionosphere
; albedo
; asteroid
; geometry
; observational method
; oxygen
; planetary atmosphere
; scattering
; sublimation
; water vapor
; wavelength
; Ceres
英文摘要: We report far ultraviolet observations of Ceres obtained with the Cosmic Origin Spectrograph (COS) of the Hubble Space Telescope in the search for atomic emissions from an exosphere. The derived brightnesses at the oxygen lines at 1304 Å and 1356 Å are consistent with zero signals within the 1σ propagated statistical uncertainties. The OI 1304 Å brightness of 0.12 ± 0.20 Rayleighs can be explained by solar resonant scattering from an atomic oxygen column density of (8.2 ± 13.4) × 1010 cm-2. Assuming that O is produced by photodissociation of H2O, we derive an upper limit for H2O abundance and compare it to previous observations. Our upper limit is well above the expected O brightness for a tenuous sublimated H2O exosphere, but it suggests that H2O production with a rate higher than 4 × 1026 molecules s-1 was not present at the time of the COS observation. Additionally, we derive an extremely low geometric albedo of ∼1% in the 1300 Å to 1400 Å range. ©2016. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84979467658&doi=10.1002%2f2015GL067451&partnerID=40&md5=f48e73b4e8a0b0eaa72181f3db12d8b0
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/10182
Appears in Collections: 科学计划与规划 气候变化与战略
There are no files associated with this item.
作者单位: School of Electrical Engineering, KTH Royal Institute of Technology, Stockholm, Sweden
Recommended Citation:
Roth L.,Ivchenko N.,Retherford K.D.,et al. Constraints on an exosphere at Ceres from Hubble Space Telescope observations[J]. Geophysical Research Letters,2016-01-01,43(6).