Report
Abundances of trace constituents in Jupiter's atmosphere inferred from Herschel/PACS observations
| العنوان: | Abundances of trace constituents in Jupiter's atmosphere inferred from Herschel/PACS observations |
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| المؤلفون: | Gapp, Cyril, Rengel, Miriam, Hartogh, Paul, Sagawa, Hideo, Feuchtgruber, Helmut, Lellouch, Emmanuel, Villanueva, Geronimo L. |
| سنة النشر: | 2024 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - Earth and Planetary Astrophysics |
| الوصف: | $Context.$ On October 31, 2009, the Photodetector Array Camera and Spectrometer (PACS) on board the Herschel Space Observatory observed far-infrared spectra of Jupiter between 50 and 220$\,\mu$m as part of the program "Water and Related Chemistry in the Solar System". $Aims.$ We investigate the disk-averaged chemical composition of Jupiter's atmosphere as a function of height using these observations. $Methods.$ We used the Planetary Spectrum Generator (PSG) and the least-squares fitting technique to infer the abundances of trace constituents. $Results.$ The PACS data include numerous spectral lines attributable to ammonia (NH$_3$), methane (CH$_4$), phosphine (PH$_3$), water (H$_2$O), and deuterated hydrogen (HD) in the Jovian atmosphere. We infer an ammonia abundance profile that decreases from a mole fraction of $(1.7\pm 0.8)\times 10^{-4}$ at $p\sim 900\,$mbar to $(1.7\pm 0.9)\times 10^{-8}$ at $p\sim 275\,$mbar, following a fractional scale height of about 0.114. For phosphine, we find a mole fraction of $(7.2\pm 1.2)\times 10^{-7}$ at pressures higher than $(550\pm 100)\,$mbar and a decrease of its abundance at lower pressures following a fractional scale height of $(0.09\pm 0.02)$. Our analysis delivers a methane mole fraction of $(1.49\pm 0.09)\times 10^{-3}$. Analyzing the HD $R(0)$ line at $112.1\,\mu$m yields a new measurement of Jupiter's D/H ratio, $\text{D/H}=(1.5\pm 0.6)\times 10^{-5}$. Finally, the PACS data allow us to put the most stringent $3\sigma$ upper limits yet on the mole fractions of hydrogen halides in the Jovian troposphere. These new upper limits are $<1.1\times 10^{-11}$ for hydrogen fluoride (HF), $<6.0\times 10^{-11}$ for hydrogen chloride (HCl), $<2.3\times 10^{-10}$ for hydrogen bromide (HBr) and $<1.2\times 10^{-9}$ for hydrogen iodide (HI) and support the proposed condensation of hydrogen halides into ammonium halide salts in the Jovian troposphere. Comment: Accepted for publication in Astronomy and Astrophysics, 16 pages, 4 tables, 24 figures incl. Appendix |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1051/0004-6361/202347345 |
| URL الوصول: | http://arxiv.org/abs/2406.02179 |
| رقم الانضمام: | edsarx.2406.02179 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1051/0004-6361/202347345 |
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