DISCOVERY OF SMALL-SCALE SPIRAL STRUCTURES IN THE DISK OF SAO 206462 (HD 135344B): IMPLICATIONS FOR THE PHYSICAL STATE OF THE DISK FROM SPIRAL DENSITY WAVE THEORY
DISCOVERY OF SMALL-SCALE SPIRAL STRUCTURES IN THE DISK OF SAO 206462 (HD 135344B): IMPLICATIONS FOR THE PHYSICAL STATE OF THE DISK FROM SPIRAL DENSITY WAVE THEORY
复制标题
DOI：
10.1088/2041-8205/748/2/l22
复制
发表时间：
2012-02
期刊：
影响因子：
--
通讯作者：
T. Muto;C. Grady;J. Hashimoto;M. Fukagawa;J. Hornbeck;M. Sitko;R. Russell;C. Werren;M. Curé;T. Currie;N. Ohashi;Y. Okamoto;M. Momose;M. Honda;S. Inutsuka;T. Takeuchi;R. Dong;L. Abe;W. Brandner;Timothy D. Brandt;J. Carson;S. Egner;M. Feldt;T. Fukue;M. Goto;O. Guyon;Y. Hayano;M. Hayashi;S. Hayashi;T. Henning;K. Hodapp;M. Ishii;M. Iye;M. Janson;R. Kandori;G. Knapp;T. Kudo;N. Kusakabe;M. Kuzuhara;T. Matsuo;S. Mayama;M. McElwain;S. Miyama;J. Morino;A. Moro-Martin;T. Nishimura;T. Pyo;E. Serabyn;H. Suto;R. Suzuki;M. Takami;N. Takato;H. Terada;C. Thalmann;D. Tomono;E. Turner;M. Watanabe;J. Wisniewski;T. Yamada;H. Takami;T. Usuda;M. Tamura
中科院分区：
文献类型：
--
作者：
T. Muto;C. Grady;J. Hashimoto;M. Fukagawa;J. Hornbeck;M. Sitko;R. Russell;C. Werren;M. Curé;T. Currie;N. Ohashi;Y. Okamoto;M. Momose;M. Honda;S. Inutsuka;T. Takeuchi;R. Dong;L. Abe;W. Brandner;Timothy D. Brandt;J. Carson;S. Egner;M. Feldt;T. Fukue;M. Goto;O. Guyon;Y. Hayano;M. Hayashi;S. Hayashi;T. Henning;K. Hodapp;M. Ishii;M. Iye;M. Janson;R. Kandori;G. Knapp;T. Kudo;N. Kusakabe;M. Kuzuhara;T. Matsuo;S. Mayama;M. McElwain;S. Miyama;J. Morino;A. Moro-Martin;T. Nishimura;T. Pyo;E. Serabyn;H. Suto;R. Suzuki;M. Takami;N. Takato;H. Terada;C. Thalmann;D. Tomono;E. Turner;M. Watanabe;J. Wisniewski;T. Yamada;H. Takami;T. Usuda;M. Tamura
我们提出了高分辨率，H波段成像观测，收集与斯巴鲁/HiCIAO，从过渡盘周围SAO 206462（HD 135344 B）的散射光。虽然以前的亚毫米图像表明在r = 46 Au处存在一个尘埃耗尽的空腔，但我们的观测揭示了距离星星0.“2（0.28 Au）的散射光成分的存在。此外，我们还发现了两个位于0.“5（1070 Au）范围内的小尺度螺旋结构。我们目前的螺旋结构模型，使用螺旋密度波理论，并得出一个磁盘的纵横比h = 0.1，这是符合以前的亚毫米观测。该模型可以潜在地基于动力学过程给出盘的温度和旋转轮廓的估计，独立于亚毫米观测。它还预测了螺旋结构的演变，可以在10-20年的时间尺度上观察到，为模型提供了结论性的测试。虽然我们不能唯一地确定这些螺旋的起源，但嵌入盘中的行星可能能够激发观察到的形态。假设是这样的话，我们就可以预测看不见的行星的位置，可能还有质量。未来的多波长观测可能会发现这样的行星。
We present high-resolution, H-band imaging observations, collected with Subaru/HiCIAO, of the scattered light from the transitional disk around SAO 206462 (HD 135344B). Although previous sub-mm imagery suggested the existence of a dust-depleted cavity at r ⩽ 46 AU, our observations reveal the presence of scattered light components as close as 0.″2 (∼ 28 AU) from the star. Moreover, we have discovered two small-scale spiral structures lying within 0.″5 (∼ 70 AU). We present models for the spiral structures using the spiral density wave theory, and derive a disk aspect ratio of h ∼ 0.1, which is consistent with previous sub-mm observations. This model can potentially give estimates of the temperature and rotation profiles of the disk based on dynamical processes, independently from sub-mm observations. It also predicts the evolution of the spiral structures, which can be observable on timescales of 10–20 years, providing conclusive tests of the model. While we cannot uniquely identify the origin of these spirals, planets embedded in the disk may be capable of exciting the observed morphology. Assuming that this is the case, we can make predictions on the locations and, possibly, the masses of the unseen planets. Such planets may be detected by future multi-wavelength observations.