Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
DETECTION OF A HYDROGEN CORONA IN HST Ly alpha IMAGES OF EUROPA IN TRANSIT OF JUPITER
KTH, School of Electrical Engineering (EES), Space and Plasma Physics.ORCID iD: 0000-0003-0554-4691
KTH, School of Electrical Engineering (EES), Space and Plasma Physics.ORCID iD: 0000-0003-2422-5426
Show others and affiliations
2017 (English)In: Astronomical Journal, ISSN 0004-6256, E-ISSN 1538-3881, Vol. 153, no 2, 67Article in journal (Refereed) Published
Abstract [en]

We report far-ultraviolet observations of Europa in transit of Jupiter obtained with the Space Telescope Imaging Spectrograph of the Hubble Space Telescope on six occasions between 2014 December and 2015 March. Absorption of Jupiter's bright hydrogen Ly alpha dayglow is detected in a region several moon radii above the limb in all observations. The observed extended absorption provides the first detection of an atomic hydrogen corona around Europa. Molecular constituents in Europa's global sputtered atmosphere are shown to be optically thin to Lya. The observations are consistent with a radially escaping H corona with maximum densities at the surface in the range of (1.5-2.2) x 10(3) cm(-3), confirming the abundances predicted by Monte Carlo simulations. In addition, we search for anomalies around the limb of Europa from absorption by localized high H2O abundances from active plumes. No significant local absorption features are detected. We find that an H2O plume with line-of-sight column density in the order of 10(16) cm(-2), as inferred by Roth et al. would not be detectable based on the statistical fluctuations of the transit measurements, and hence is not excluded or further constrained. The presence of plumes with line-of-sight column densities of >2 x 10(17) cm(-2) can be excluded at a 3-sigma level during five of our six observations.

Place, publisher, year, edition, pages
Institute of Physics (IOP), 2017. Vol. 153, no 2, 67
Keyword [en]
planets and satellites: atmospheres, planets and satellites: composition, planets and satellites: detection
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-204093DOI: 10.3847/1538-3881/153/2/67ISI: 000393967900002ScopusID: 2-s2.0-85012067039OAI: oai:DiVA.org:kth-204093DiVA: diva2:1085421
Note

QC 20170329

Available from: 2017-03-29 Created: 2017-03-29 Last updated: 2017-04-28Bibliographically approved

Open Access in DiVA

fulltext(2197 kB)0 downloads
File information
File name FULLTEXT01.pdfFile size 2197 kBChecksum SHA-512
22b334cd738d0e7651c71fc13da03de8c0a8a4ee42201913d4759d776638f3af58b73045ce06db147d78918202dec077034a09aa670f786f85e82dd67c688657
Type fulltextMimetype application/pdf

Other links

Publisher's full textScopus

Search in DiVA

By author/editor
Roth, LorenzIvchenko, NickolaySchlatter, Nicola
By organisation
Space and Plasma PhysicsKTH
In the same journal
Astronomical Journal
Physical Sciences

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 2 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf