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Probing Ganymede's ...
Probing Ganymede's Atmosphere with HST Ly alpha Images in Transit of Jupiter
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- Roth, Lorenz (author)
- KTH,Rymd- och plasmafysik
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- Marchesini, Gregorio (author)
- KTH,Rymd- och plasmafysik
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- Becker, Tracy M. (author)
- Southwest Res Inst, 6220 Culebra Rd, San Antonio, TX 78238 USA.;Univ Texas San Antonio, 1 UTSA Circle, San Antonio, TX 78249 USA.
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- Hoeijmakers, H. Jens (author)
- Lund Univ, Dept Astron & Theoret Phys, Lund Observ, S-22100 Lund, Sweden.
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- Molyneux, Philippa M. (author)
- Southwest Res Inst, 6220 Culebra Rd, San Antonio, TX 78238 USA.
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- Retherford, Kurt D. (author)
- Southwest Res Inst, 6220 Culebra Rd, San Antonio, TX 78238 USA.;Univ Texas San Antonio, 1 UTSA Circle, San Antonio, TX 78249 USA.
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- Saur, Joachim (author)
- Univ Cologne, Inst Geophys & Meteorol, Albertus Magnus Pl, D-50923 Cologne, Germany.
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- Mogan, Shane Carberry R. (author)
- Univ Calif Berkeley, Space Sci Lab, 7 Gauss Way, Berkeley, CA 94720 USA.
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- Szalay, Jamey R. (author)
- Princeton Univ, Dept Astrophys Sci, 4 Ivy Lane, Princeton, NJ 08540 USA.
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(creator_code:org_t)
- American Astronomical Society, 2023
- 2023
- English.
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In: The Planetary Science Journal. - : American Astronomical Society. - 2632-3338. ; 4:1, s. 12-
- Related links:
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https://urn.kb.se/re...
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https://doi.org/10.3...
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Abstract
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- We report results from far-ultraviolet observations by the Hubble Space Telescope of Jupiter's largest moon, Ganymede, transiting across the planet's dayside hemisphere. Within a targeted campaign on 2021 September 9 two exposures were taken during one transit passage to probe for attenuation of Jupiter's hydrogen Ly alpha dayglow above the moon limb. The background dayglow is slightly attenuated over an extended region around Ganymede, with stronger attenuation in the second exposure, when Ganymede was near the planet's center. In the first exposure, when the moon was closer to Jupiter's limb, the effects from the Ganymede corona are hardly detectable, likely because the Jovian Ly alpha dayglow is spectrally broader and less intense at this viewing geometry. The obtained vertical H column densities of around (1-2) x 10(12) cm(-2) are consistent with previous results. Constraining angular variability around Ganymede's disk, we derive an upper limit on a local H2O column density of (2-3) x 10(16) cm(-2), such as could arise from outgassing plumes in regions near the observed moon limb.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Publication and Content Type
- ref (subject category)
- art (subject category)
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