Polycyclic Aromatic Hydrocarbons in Protoplanetary Disks around Herbig Ae/Be and T Tauri Stars
文献类型：期刊论文
| 作者 | Seok,Ji Yeon1,2; Li,Aigen1 |
| 刊名 | The Astrophysical Journal
 |
| 出版日期 | 2017-02-02 |
| 卷号 | 835期号:2 |
| ISSN号 | 0004-637X |
| 关键词 | circumstellar matter infrared: stars planetary systems protoplanetary disks |
| DOI | 10.3847/1538-4357/835/2/291 |
| 英文摘要 | Abstract A distinct set of broad emission features at 3.3, 6.2, 7.7, 8.6, 11.3, and 12.7 μm, is often detected in protoplanetary disks (PPDs). These features are commonly attributed to polycyclic aromatic hydrocarbons (PAHs). We model these emission features in the infrared spectra of 69 PPDs around 14 T Tauri and 55 Herbig Ae/Be stars in terms of astronomical PAHs. For each PPD, we derive the size distribution and the charge state of the PAHs. We then examine the correlations of the PAH properties (i.e., sizes and ionization fractions) with the stellar properties (e.g., stellar effective temperature, luminosity, and mass). We find that the characteristic size of the PAHs tends to correlate with the stellar effective temperature ( ) and interpret this as the preferential photodissociation of small PAHs in systems with higher of which the stellar photons are more energetic. In addition, the PAH size shows a moderate correlation with the red-ward wavelength shift of the 7.7 μm PAH feature that is commonly observed in disks around cool stars. The ionization fraction of PAHs does not seem to correlate with any stellar parameters. This is because the charging of PAHs depends on not only the stellar properties (e.g., , luminosity) but also their spatial distribution in the disks. The marginally negative correlation between PAH size and stellar age suggests that continuous replenishment of PAHs via the outgassing of cometary bodies and/or the collisional grinding of planetesimals and asteroids is required to maintain the abundance of small PAHs against complete destruction by photodissociation. |
| 语种 | 英语 |
| 出版者 | The American Astronomical Society |
| WOS记录号 | IOP:0004-637X-835-2-291 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/36109]  |
| 专题 | 中国科学院国家天文台 |
| 作者单位 | 1.Department of Physics and Astronomy, University of Missouri, Columbia, MO 65211, USA; seokji@missouri.edu, lia@missouri.edu, jiseok@bao.ac.cn 2.Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China |
| 推荐引用方式 GB/T 7714 | Seok,Ji Yeon,Li,Aigen. Polycyclic Aromatic Hydrocarbons in Protoplanetary Disks around Herbig Ae/Be and T Tauri Stars[J]. The Astrophysical Journal,2017,835(2). |
| APA | Seok,Ji Yeon,&Li,Aigen.(2017).Polycyclic Aromatic Hydrocarbons in Protoplanetary Disks around Herbig Ae/Be and T Tauri Stars.The Astrophysical Journal,835(2). |
| MLA | Seok,Ji Yeon,et al."Polycyclic Aromatic Hydrocarbons in Protoplanetary Disks around Herbig Ae/Be and T Tauri Stars".The Astrophysical Journal 835.2(2017). |
入库方式： OAI收割
来源：国家天文台
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