劉 姝玥 Liu, Shuyue

 

東京大学 大学院新領域創成科学研究科 複雑理工学専攻

吉川研究室 修士課程1年

 

Email: liu-shuyue@g.ecc.u-tokyo.ac.jp

居室：新領域基盤棟4E5（柏キャンパス）

 

Research Theme:

The effect of space weathering on the UV-visible spectrum of PAH

Research Progress:

I am learning about the PAH hypothesis and related astronomical and astrochemical background knowledge by reading papers.

Through experimental study of the absorption spectra of specific PAH molecules,I am learning about the knowledge related to UV experiments and how to process experimental data.

Also I am learning how to calculate the UV-visible absorption spectra of PAH by studying the literature.

 

Research background:

PAH, known as polycyclic aromatic hydrocarbons, contains only carbon and hydrogen and may be very abundant in the universe. With the development and study of astronomical observations, the PAH hypothesis was proposed. In recent years, the study of its presence in the universe has developed rapidly, and PAHs have been detected in nebulae and in the upper atmosphere of Saturn’s largest moon, Titan.[1][2] Among them, the hypothesis suggests that the absorption band of PAHs around 210 nm may correspond to the absorption band of 217.5 nm that appears on the interstellar extinction curve.[3] Also, objects exposed to outer space and cosmic rays undergo space weathering, and these processes affect their physical and optical properties. Carbonization increases the proportion of carbon atoms in organic matter on the surface of space weathered objects. If it can be confirmed that their absorption bands tend to shift toward the long-wave side due to exposure, this would be a clue to connect the 217.5 nm absorption band of interstellar medium and polycyclic aromatic hydrocarbons.

Reference:

[1] Garcia-Hernandez D A , Manchado A , Garcia-Lario P , et al. Formation of fullerenes in Hcontaining Planetary Nebulae[J]. Astrophysical Journal Letters, 2010, 724(1):L39.

[2] Lopez-Puertas M , Dinelli B M , Adriani A , et al. LARGE ABUNDANCES OF POLYCYCLIC AROMATIC HYDROCARBONS IN TITAN’S UPPER ATMOSPHERE[J]. The Astrophysical Journal, 2013, 770(2):132-.

[3] Joblin C , Leger A , Martin P . Contribution of polycyclic aromatic hydrocarbon molecules to the interstellar extinction curve[J]. Astrophysical Journal, 1992, 393(2):L79-L82.