Deciphering cometary outbursts: linking gas composition changes to trigger mechanisms

被引：0

作者：

Muller, Daniel R. ^{[1
]}

Altwegg, Kathrin ^{[1
]}

Berthelier, Jean-Jacques ^{[2
]}

Combi, Michael R. ^{[3
]}

De Keyser, Johan ^{[4
]}

Fuselier, Stephen A. ^{[5
,6
]}

Garnier, Philippe ^{[7
]}

Hanni, Nora ^{[1
]}

Mall, Urs ^{[8
]}

Rubin, Martin ^{[1
]}

Wampfler, Susanne F. ^{[9
]}

Wurz, Peter ^{[1
,9
]}

机构：

[1] Univ Bern, Phys Inst, Space Res & Planetary Sci, Sidlerstr 5, CH-3012 Bern, Switzerland

[2] Lab Atmospheres, Milieux, Observat Spatiales LATMOS, 4 Ave Neptune, F-94100 Saint-maur, France

[3] Univ Michigan, Dept Climate & Space Sci & Engn, 2455 Hayward, Ann Arbor, MI 48109 USA

[4] Royal Belgian Inst Space Aeron, BIRA, IASB, Ringlaan 3, B-1180 Brussels, Belgium

[5] Southwest Res Inst, Space Sci Directorate, 6220 Culebra Rd, San Antonio, TX 78228 USA

[6] Univ Texas San Antonio, Dept Phys & Astron, San Antonio, TX 78249 USA

[7] Univ Toulouse, IRAP, CNRS, CNES,UPS, 9 Ave Colonel Roche, F-31028 Toulouse, France

[8] Max Planck Inst Solar Syst Res, Justus von Liebig Weg 3, D-37077 Gottingen, Germany

[9] Univ Bern, Ctr Space & Habitabil, Gesellschaftsstr 6, CH-3012 Bern, Switzerland

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2024年 / 529卷 / 03期

基金：

瑞士国家科学基金会;

关键词：

instrumentation: detectors; methods: data analysis; comets: general; comets: individual: 67P/Churyumov-Gerasimenko; DUST OUTBURSTS; 67P/CHURYUMOV-GERASIMENKO; COMA; 67P; MODEL; SURFACE; ORIGIN; JETS; H2O; ION;

D O I：

10.1093/mnras/stae622

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Dust and gas outbursts are recurrent cometary phenomena, playing a crucial role in shaping the coma. Proposed outburst trigger mechanisms include cliff collapse, pressure pockets, and amorphous-to-crystalline phase transition of water ice; however, the underlying processes remain inadequately understood. In this study, we analyse Rosetta/ROSINA data from multiple outbursts on comet 67P/Churyumov-Gerasimenko and present the evolution of the gas composition in the comet's coma during outburst events. We distinguish two distinct categories of cometary outbursts on the comet: water-driven events characterized by rapid (minutes to hours) changes in coma composition, and CO2-driven events displaying a slow, prolonged (hours to days) increase in highly volatile species. We tentatively associate these different gas composition patterns with different trigger mechanisms. Exposure of fresh ice due to cliff collapse leads to a notable water enhancement, while most perihelion outbursts coincide with substantial density increases of CO2. We propose that these CO2-driven events originate from subsurface gas-filled cavities, whose walls are suggested to have been sealed by earlier refreezing of CO2 migrating from warmer spots, hence increasing the cavity pressure required to burst.

引用

页码：2763 / 2776

页数：14

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