期刊
SCIENCE
卷 347, 期 6220, 页码 -出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aaa0276
关键词
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资金
- State of Bern
- Swiss National Science Foundation
- European Space Agency (ESA) PRODEX Program
- Max-Planck-Gesellschaft (MPG)
- Bundesministerium fur Wirtschaft und Energie (BMWI) [50QP1302]
- Jet Propulsion Laboratory (JPL) [1496541]
- NASA [NNX148F71G, JPL-1266313]
- Belgian Science Policy Office via PRODEX/ROSINA PEA [90020]
- Science and Technology Facilities Council (STFC)
- A*MIDEX project - Investissements d'Avenir French Government program [ANR-11-IDEX-0001-02]
- CNES at IRAP
- CNES at LATMOS
- CNES at LPC2E
- Laboratoire d'Astrophysique de Marseille (LAM)
- CRPG
- European Research Council [267255]
- Ministry of Science
- Israel Space agency
- NASA JPL [NAS703001TONMO710889]
- Science and Technology Facilities Council [ST/K001051/1] Funding Source: researchfish
- STFC [ST/K001051/1] Funding Source: UKRI
Comets contain the best-preserved material from the beginning of our planetary system. Their nuclei and comae composition reveal clues about physical and chemical conditions during the early solar system when comets formed. ROSINA (Rosetta Orbiter Spectrometer for Ion and Neutral Analysis) onboard the Rosetta spacecraft has measured the coma composition of comet 67P/Churyumov-Gerasimenko with well-sampled time resolution per rotation. Measurements were made over many comet rotation periods and a wide range of latitudes. Thesemeasurements show large fluctuations in composition in a heterogeneous coma that has diurnal and possibly seasonal variations in the major outgassing species: water, carbon monoxide, and carbon dioxide. These results indicate a complex coma-nucleus relationship where seasonal variations may be driven by temperature differences just below the comet surface.
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