Roth, Lorenz ORCID: 0000-0003-0554-4691, Ivchenko, Nickolay ORCID: 0000-0003-2422-5426, Retherford, Kurt D., Cunningham, Nathaniel J., Feldman, Paul D., Saur, Joachim ORCID: 0000-0003-1413-1231, Spencer, John R. and Strobel, Darrell F. (2016). Constraints on an exosphere at Ceres from Hubble Space Telescope observations. Geophys. Res. Lett., 43 (6). S. 2465 - 2473. WASHINGTON: AMER GEOPHYSICAL UNION. ISSN 1944-8007

Full text not available from this repository.

Abstract

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 angstrom and 1356 angstrom are consistent with zero signals within the 1 sigma propagated statistical uncertainties. The OI 1304 angstrom 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) x 10(10)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 x 10(26)moleculess(-1) was not present at the time of the COS observation. Additionally, we derive an extremely low geometric albedo of approximate to 1% in the 1300 angstrom to 1400 angstrom range.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Roth, LorenzUNSPECIFIEDorcid.org/0000-0003-0554-4691UNSPECIFIED
Ivchenko, NickolayUNSPECIFIEDorcid.org/0000-0003-2422-5426UNSPECIFIED
Retherford, Kurt D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Cunningham, Nathaniel J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Feldman, Paul D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Saur, JoachimUNSPECIFIEDorcid.org/0000-0003-1413-1231UNSPECIFIED
Spencer, John R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Strobel, Darrell F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-281009
DOI: 10.1002/2015GL067451
Journal or Publication Title: Geophys. Res. Lett.
Volume: 43
Number: 6
Page Range: S. 2465 - 2473
Date: 2016
Publisher: AMER GEOPHYSICAL UNION
Place of Publication: WASHINGTON
ISSN: 1944-8007
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
EMISSION CROSS-SECTIONS; ELECTRON-IMPACT; ULTRAVIOLET OBSERVATIONS; WATER-VAPOR; OXYGEN; SUBLIMATION; ATMOSPHERE; GANYMEDE; ALBEDO; AURORAMultiple languages
Geosciences, MultidisciplinaryMultiple languages
Refereed: Yes
URI: http://kups.ub.uni-koeln.de/id/eprint/28100

Downloads

Downloads per month over past year

Altmetric

Export

Actions (login required)

View Item View Item