TW Hydrae中20 AU处盘间隙候选体的发现
地球与行星天体物理
2015-06-24 v2
摘要
我们呈现了一幅新的Subaru/HiCIAO高对比度H波段偏振强度（PI）图像，对象为与TW Hydrae相关的邻近过渡盘。盘的散射光从0.2"到1.5"（11-81 AU）被探测到，且PI图像在距中心恒星约0.4"（约20 AU）处显示出清晰的轴对称偏振强度凹陷，类似于先前HST图像报道的约80 AU间隙。方位角偏振强度轮廓也显示超出0.2"的盘几乎是轴对称的。我们讨论了解释偏振强度凹陷起源的两种可能情景：1）因为偏振强度轮廓中看到的浅斜率，可能在距中心恒星约20 AU处存在间隙结构；2）盘的内区可能正在发生颗粒生长。NIR和毫米/亚毫米波长的多波段观测在调查尘埃不透明度方面起补充作用，并可能有助于更精确地揭示间隙起源。
引用
@article{arxiv.1503.01856,
title = {Discovery of a Disk Gap Candidate at 20 AU in TW Hydrae},
author = {E. Akiyama and T. Muto and N. Kusakabe and A. Kataoka and J. Hashimoto and T. Tsukagoshi and J. Kwon and T. Kudo and R. Kandori and C. A. Grady and M. Takami and M. Janson and M. Kuzuhara and T. Henning and M. L. Sitko and J. C. Carson S. Mayama and T. Currie and C. Thalmann and J. Wisniewski and M. Momose and N. Ohashi and L. Abe and W. Brandner and T. D. Brandt and S. Egner and M. Feldt and M. Goto and O. Guyon and Y. Hayano and M. Hayashi and S. Hayashi and K. W. Hodapp and M. Ishi and M. Iye and G. R. Knapp and T. Matsuo and M. W. McElwain and S. Miyama and J. -I. Morino and A. Moro-Martin and T. Nishimura and T. -S. Pyo and G. Serabyn and T. Suenaga and H. Suto and R. Suzuki and Y. H. Takahashi and N. Takato and H. Terada and D. Tomono and E. L. Turner and M. Watanabe and T. Yamada and H. Takami and T. Usuda and M. Tamura},
journal= {arXiv preprint arXiv:1503.01856},
year = {2015}
}
备注
8 pages, 2 figures, ApJL accepted for publication