تقرير
Hubble Ultraviolet Spectroscopy of Jupiter Trojans
| العنوان: | Hubble Ultraviolet Spectroscopy of Jupiter Trojans |
|---|---|
| المؤلفون: | Wong, Ian, Brown, Michael E., Blacksberg, Jordana, Ehlmann, Bethany L., Mahjoub, Ahmed |
| سنة النشر: | 2019 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - Earth and Planetary Astrophysics |
| الوصف: | We present the first ultraviolet spectra of Jupiter Trojans. These observations were carried out using the Space Telescope Imaging Spectrograph on the Hubble Space Telescope and cover the wavelength range 200-550 nm at low resolution. The targets include objects from both of the Trojan color subpopulations (less-red and red). We do not observe any discernible absorption features in these spectra. Comparisons of the averaged UV spectra of less-red and red targets show that the subpopulations are spectrally distinct in the UV. Less-red objects display a steep UV slope and a rollover at around 450 nm to a shallower visible slope, whereas red objects show the opposite trend. Laboratory spectra of irradiated ices with and without H$_{2}$S exhibit distinct UV absorption features; consequently, the featureless spectra observed here suggest H$_{2}$S alone is not responsible for the observed color bimodality of Trojans, as has been previously hypothesized. We propose some possible explanations for the observed UV-visible spectra, including complex organics, space weathering of iron-bearing silicates, and masked features due to previous cometary activity. Comment: 7 pages, 4 figures, accepted by AJ |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.3847/1538-3881/ab0e00 |
| URL الوصول: | http://arxiv.org/abs/1903.03576 |
| رقم الأكسشن: | edsarx.1903.03576 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.3847/1538-3881/ab0e00 |
|---|