彗星81P/ワイルド2彗星の彗星と恒星間塵分析器
J Kissel1, F R Krueger, J Silén
1Max-Planck-Institut fur Aeronomie, Max-Planck-Strasse 2, D-37191 Katlenburg-Lindau, Germany.
まとめ
彗星と恒星間塵の分析は,キノンの誘導体を含む有機物質を明らかにしています. 彗星の塵は水素と酸素を失い,窒素が豊富になるが,星間塵はこれらの元素を保持する.
科学分野:
- 宇宙化学 (コスモケミストリー)
- 天体生物学 アストロバイオロジー
- 惑星科学は惑星科学である.
背景:
- スターダストミッションは,彗星および恒星間塵を彗星および恒星間塵分析器 (CIDA) を使用して分析した.
- 以前の研究では,有機分子が地球外塵に存在する可能性が示唆されていました.
- 塵の組成を理解することは,生命の起源と惑星の形成を理解するための鍵です.
研究 の 目的:
- 恒星間および彗星の塵粒子の有機組成を分析する.
- 異なる起源の塵の分子構成を比較する.
- 恒星間空間から彗星までの有機物質の化学的進化を調査する.
主な方法:
- 彗星と星間塵分析器 (CIDA) 装置,飛行時間質量スペクトロメーターを使用しました.
- 45個の星間塵粒子と,彗星81P/ワイルド2号からの29個の粒子からのイオンスペクトルを分析した.
- 特定された有機成分とその元素組成.
主要な成果:
- 星間塵の微粒子の有機成分に含まれるキノンの誘導体を特定した.
- 彗星塵の有機物質の存在が確認されました.
- 彗星塵の水素と酸素が星間塵と比較して減っていることが観察され,これらの元素は気相 (水,一酸化炭素) として存在する可能性が高い.
- 彗星の塵は窒素を含む種に富んでいることが判明しました.
- アミノ酸は検出されなかったが,彗星塵のスペクトルの一つで硫黄イオンが特定された.
結論:
- 彗星と恒星間の塵は,有機成分を共有していますが,重要な化学処理を受けています.
- 星間環境から彗星環境への移行は,有機物質から水素と酸素の喪失につながります.
- 窒素と硫黄の種は,彗星の有機化学において重要な存在であるように思われる.
関連する概念動画
Kepler's First Law of Planetary Motion
In the early 17th century, German astronomer and mathematician Johannes Kepler postulated three laws for the motion of planets in the solar system. He formulated his first two laws based on the observations of his forebears, Nikolaus Copernicus and Tycho Brahe.
Polish astronomer Nikolaus Copernicus put forth a theory that stated a heliocentric model for the solar system. According to this heliocentric theory, all the planets, including Earth, orbit the Sun in circular orbits.
On the other hand,...
Polish astronomer Nikolaus Copernicus put forth a theory that stated a heliocentric model for the solar system. According to this heliocentric theory, all the planets, including Earth, orbit the Sun in circular orbits.
On the other hand,...
Kepler's Second Law of Planetary Motion
In the early 17th century, German astronomer and mathematician Johannes Kepler postulated three laws for the motion of planets in the solar system. His first law states that all planets orbit the Sun in an elliptical orbit, with the Sun at one of the ellipse's foci. Therefore, the distance of a planet from the Sun varies throughout its revolution around the Sun.
While in an elliptical orbit, the total energy of the planet is conserved. Therefore, the planet slows down when it is at apogee and...
While in an elliptical orbit, the total energy of the planet is conserved. Therefore, the planet slows down when it is at apogee and...
Kepler's Third Law of Planetary Motion
In the early 17th century, German astronomer and mathematician Johannes Kepler postulated three laws for the motion of planets in the solar system. In 1909, he formulated his first two laws based on the observations of his forebears, Nikolaus Copernicus and Tycho Brahe. However, in 1918, he published his third law of planetary motion, which gives a precise mathematical relationship between a planet's average distance from the Sun and the amount of time it takes to revolve around the Sun. It...
Atomic Emission Spectroscopy: Instrumentation
The instrumentation of atomic emission spectrometry (AES) involves various components, including atomization devices that convert samples into gas-phase atoms and ions. There are two main types of atomization devices: continuous and discrete atomizers. Continuous atomizers, like plasmas and flames, introduce samples in a constant stream, while discrete atomizers inject individual samples using syringes or autosamplers. The most common discrete atomizer is the electrothermal atomizer.
Atomic Emission Spectroscopy: Lab
AES is a powerful analytical technique, especially effective when used with plasma sources, producing abundant spectra in characteristic emission lines. The Inductively Coupled Plasma (ICP), in particular, yields superior quantitative analytical data due to its high stability, low noise, low background, and minimal interferences under optimal experimental conditions. However, newer air-operated microwave sources are emerging as promising alternatives that could be more cost-effective than...
Flame Photometry: Lab
In a flame photometer, when a solution like potassium chloride is aspirated into the flame, the solvent evaporates, leaving behind dehydrated salt. This salt dissociates into free gaseous atoms in their ground state. Some of these atoms absorb energy from the flame, leading to their excitation. The excited atoms return to the ground state, emitting photons at characteristic wavelengths. Because only electronic transitions are involved, the resulting emission lines are very narrow. The intensity...


