Detection of an NH$_3$ absorption band at 2.2 $μ$m on Europa
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866911190368649216 |
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| author | Emran, A. |
| author_facet | Emran, A. |
| contents | The presence of NH$_3$-bearing components on icy planetary bodies has important implications for their geology and potential habitability. Here, I report the detection of a characteristic NH$_3$ absorption feature at 2.20 $\pm$ 0.02 $μ$m on Europa, identified in an observation from the Galileo Near Infrared Mapping Spectrometer. Spectral modeling and band position indicate that NH$_3$-hydrate and NH$_4$-chloride are the most plausible candidates. Spatial correlation between detected ammonia signatures and Europa's microchaos, linear, and band geologic units suggests emplacement from the underground or shallow subsurface. I posit that NH$_3$-bearing materials were transported to the surface via effusive cryovolcanism or similar mechanisms during Europa's recent geological past. The presence of ammoniated compounds implies a thinner ice shell (Spohn & Schubert, 2003) and a thicker, chemically reduced, high-pH subsurface ocean on Europa (Hand et al. 2009). With the detection of NH$_3$-bearing components, this study presents the first evidence of a nitrogen-bearing species on Europa -- an observation of astrobiological significance given nitrogen's essential role in the chemistry of life. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2510_02508 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Detection of an NH$_3$ absorption band at 2.2 $μ$m on Europa Emran, A. Earth and Planetary Astrophysics The presence of NH$_3$-bearing components on icy planetary bodies has important implications for their geology and potential habitability. Here, I report the detection of a characteristic NH$_3$ absorption feature at 2.20 $\pm$ 0.02 $μ$m on Europa, identified in an observation from the Galileo Near Infrared Mapping Spectrometer. Spectral modeling and band position indicate that NH$_3$-hydrate and NH$_4$-chloride are the most plausible candidates. Spatial correlation between detected ammonia signatures and Europa's microchaos, linear, and band geologic units suggests emplacement from the underground or shallow subsurface. I posit that NH$_3$-bearing materials were transported to the surface via effusive cryovolcanism or similar mechanisms during Europa's recent geological past. The presence of ammoniated compounds implies a thinner ice shell (Spohn & Schubert, 2003) and a thicker, chemically reduced, high-pH subsurface ocean on Europa (Hand et al. 2009). With the detection of NH$_3$-bearing components, this study presents the first evidence of a nitrogen-bearing species on Europa -- an observation of astrobiological significance given nitrogen's essential role in the chemistry of life. |
| title | Detection of an NH$_3$ absorption band at 2.2 $μ$m on Europa |
| topic | Earth and Planetary Astrophysics |
| url | https://arxiv.org/abs/2510.02508 |