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A Low Signal Detection of X-Rays From Uranus

文献类型：期刊论文

作者Dunn, W. R.5; Ness, J-U4; Lamy, L.2,3; Tremblay, G. R.1; Branduardi-Raymont, G.5; Snios, B.1; Kraft, R. P.1; Yao, Z.6; Wibisono, A. D.5
刊名JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
出版日期2021-04-01
卷号126期号:4页码:11
ISSN号2169-9380
关键词aurora Chandra X‐ ray Observatory Ice Giants rings Uranus X‐ ray
DOI10.1029/2020JA028739
英文摘要Within the solar system, X-ray emissions have been detected from every planet except the Ice Giants: Uranus and Neptune. We analyze the three archival Chandra X-ray observations of Uranus (each 24-30 ks duration) to date: a stand-alone Advanced CCD Imaging Spectrometer (ACIS) observation on August 7, 2002 and two High Resolution Camera (HRC) observations on November 11 and 12, 2017 coordinated with optical observations. For the earlier ACIS observation, the Uranus-coincident photons were clustered in the 0.6-1.1 keV spectral range, consistent with emission from Jupiter and Saturn. To test the significance of the detected signal, we distributed a grid of similar to 10,000 Uranus-sized regions across the field of view (FoV). The number of Uranus-coincident X-ray photons in the 0.5-1.2 keV range exceeded 99.9% of Uranus-sized regions across the FoV (10.2 standard deviations > FoV mean; probability of chance occurrence similar to 10(-6)-10(-7)). However, the planetary signal was low with only 5 +/- 2.2 X-ray photons against a FoV mean background of 0.16 photons. Without the possibility of energy filtering, the recent HRC observations had a much brighter background (FoV mean similar to 10 photons). Consequently, neither of the new observations provided a second unambiguous Uranus detection, although a 40-min interval of brightening on November 12, 2017 did produce a signal above 99.9% of the FoV. The observed Uranus X-ray fluxes of 10(-15)-10(-16) erg/cm(2)/s are consistent with previous observational limits and modeling predictions. These fluxes exceed expectations from scattered solar emission alone, suggesting either a larger X-ray albedo than Jupiter/Saturn or the possibility of additional X-ray production processes at Uranus. Further observations are needed to test this.
WOS关键词WIND CHARGE-EXCHANGE ; XMM-NEWTON ; 1ST OBSERVATION ; EMISSION ; DISCOVERY ; CHANDRA ; AURORAE ; SURFACE ; MARS
资助项目Science and Technology Facilities Council (STFC) ; European Space Agency (ESA)[4000120752/17/NL/MH] ; CNES ; CNRS/INSU programs of planetology and heliophysics ; Chandra project
WOS研究方向Astronomy & Astrophysics
语种英语
出版者AMER GEOPHYSICAL UNION
WOS记录号WOS:000645003000034
资助机构Science and Technology Facilities Council (STFC) ; Science and Technology Facilities Council (STFC) ; European Space Agency (ESA) ; European Space Agency (ESA) ; CNES ; CNES ; CNRS/INSU programs of planetology and heliophysics ; CNRS/INSU programs of planetology and heliophysics ; Chandra project ; Chandra project ; Science and Technology Facilities Council (STFC) ; Science and Technology Facilities Council (STFC) ; European Space Agency (ESA) ; European Space Agency (ESA) ; CNES ; CNES ; CNRS/INSU programs of planetology and heliophysics ; CNRS/INSU programs of planetology and heliophysics ; Chandra project ; Chandra project ; Science and Technology Facilities Council (STFC) ; Science and Technology Facilities Council (STFC) ; European Space Agency (ESA) ; European Space Agency (ESA) ; CNES ; CNES ; CNRS/INSU programs of planetology and heliophysics ; CNRS/INSU programs of planetology and heliophysics ; Chandra project ; Chandra project ; Science and Technology Facilities Council (STFC) ; Science and Technology Facilities Council (STFC) ; European Space Agency (ESA) ; European Space Agency (ESA) ; CNES ; CNES ; CNRS/INSU programs of planetology and heliophysics ; CNRS/INSU programs of planetology and heliophysics ; Chandra project ; Chandra project
源URL[http://ir.iggcas.ac.cn/handle/132A11/101205]  
专题地质与地球物理研究所_中国科学院地球与行星物理重点实验室
通讯作者Dunn, W. R.
作者单位1.Harvard Smithsonian Ctr Astrophys, Smithsonian Astrophys Observ, 60 Garden St, Cambridge, MA 02138 USA
2.Aix Marseille Univ, CNES, CNRS, Pytheas,LAM, Marseille, France
3.Univ Paris, Sorbonne Univ, Univ PSL, Observ Paris,LESIA, Meudon, France
4.European Space Astron Ctr, Madrid, Spain
5.Univ Coll London, Mullard Space Sci Lab, Dorking, Surrey, England
6.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, Beijing, Peoples R China
推荐引用方式
GB/T 7714		 Dunn, W. R.,Ness, J-U,Lamy, L.,et al. A Low Signal Detection of X-Rays From Uranus[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,2021,126(4):11.
APA Dunn, W. R..,Ness, J-U.,Lamy, L..,Tremblay, G. R..,Branduardi-Raymont, G..,...&Wibisono, A. D..(2021).A Low Signal Detection of X-Rays From Uranus.JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,126(4),11.
MLA Dunn, W. R.,et al."A Low Signal Detection of X-Rays From Uranus".JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 126.4(2021):11.

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来源：地质与地球物理研究所

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