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| Titel |
CO Upper Limits on Jupiter's Atmosphere After the July 2009 Impact |
| VerfasserIn |
Raphaël Moreno, Bruno Bézard, André Marten, Emmanuel Lellough, Pierre Drossart, Paul Hartogh, Thibault Cavalalie, Miriam Rengel, Glenn Orton, Jose Luis Ortiz |
| Konferenz |
EGU General Assembly 2010
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250044483
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| Zusammenfassung |
| We report a search for carbon monoxide in Jupiter’s atmosphere after the impact of July 19th
2009 with the IRAM-30m telescope (Pico Veleta, Spain)
The CO (2-1) rotational line (at a frequency of 230.538 GHz) has been observed on the
new impact on Jupiter, on July 24th and 27th 2009 (i.e. ~5, and 8 days after the impact)
without any clear CO (2-1) detection. The rms in antenna temperature was about
0.06 K. For comparison, the same rms was measured in July 1994 on the medium
impact site E from comet SL9. On October 29th 2009, we tried again to search
for CO, having in mind that the dispersion would increase the emitting size and
favour the CO detection. Nevertheless, this last measurement did not detect CO
either.
Taking into account the estimated impact size on July 20th (11- in longitude and 5.5- in
latitude), we ran several radiative transfer model of Jupiter’s atmosphere. With
stratospheric temperatures taken between 162 and 165 K at pressures less than
0.1 mbar, we found a 2-sigma upper limit of CO mass of 1 x 1013 and 6 x 1013 g,
respectively. Assuming that CO is formed by shock chemistry, these upper limits
correspond to a cometary (icy) impactor diameter less than 320 or 575 m, respectively. |
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