DISCOVERY OF A DISK GAP CANDIDATE AT 20 AU IN TW HYDRAE

DISCOVERY OF A DISK GAP CANDIDATE AT 20 AU IN TW HYDRAE
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DOI：
10.1088/2041-8205/802/2/l17
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发表时间：
2015-03
期刊：
The Astrophysical Journal Letters
影响因子：
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通讯作者：
E. Akiyama;T. Muto;N. Kusakabe;A. Kataoka;J. Hashimoto;T. Tsukagoshi;J. Kwon;T. Kudo;R. Kandori;C. Grady;M. Takami;M. Janson;M. Kuzuhara;T. Henning;M. Sitko;J. C. C. S. Mayama-J.-C.-C.-S.-Mayama-1401890576;T. Currie;C. Thalmann;J. Wisniewski;M. Momose;N. Ohashi;L. Abe;W. Brandner;Timothy D. Brandt;S. Egner;M. Feldt;M. Goto;O. Guyon;Y. Hayano;M. Hayashi;S. Hayashi;K. Hodapp;M. Ishi;M. Iye;G. Knapp;T. Matsuo;M. McElwain;S. Miyama;J. Morino;A. Moro-Martin;T. Nishimura;T. Pyo;G. Serabyn;T. Suenaga;H. Suto;R. Suzuki;Y. Takahashi;N. Takato;H. Terada;D. Tomono;E. Turner;M. Watanabe;T. Yamada;H. Takami;T. Usuda;M. Tamura
E. Akiyama;T. Muto;N. Kusakabe;A. Kataoka;J. Hashimoto;T. Tsukagoshi;J. Kwon;T. Kudo;R. Kandori;C. Grady;M. Takami;M. Janson;M. Kuzuhara;T. Henning;M. Sitko;J. C. C. S. Mayama-J.-C.-C.-S.-Mayama-1401890576;T. Currie;C. Thalmann;J. Wisniewski;M. Momose;N. Ohashi;L. Abe;W. Brandner;Timothy D. Brandt;S. Egner;M. Feldt;M. Goto;O. Guyon;Y. Hayano;M. Hayashi;S. Hayashi;K. Hodapp;M. Ishi;M. Iye;G. Knapp;T. Matsuo;M. McElwain;S. Miyama;J. Morino;A. Moro-Martin;T. Nishimura;T. Pyo;G. Serabyn;T. Suenaga;H. Suto;R. Suzuki;Y. Takahashi;N. Takato;H. Terada;D. Tomono;E. Turner;M. Watanabe;T. Yamada;H. Takami;T. Usuda;M. Tamura
中科院分区：
其他
文献类型：
--
作者：
E. Akiyama;T. Muto;N. Kusakabe;A. Kataoka;J. Hashimoto;T. Tsukagoshi;J. Kwon;T. Kudo;R. Kandori;C. Grady;M. Takami;M. Janson;M. Kuzuhara;T. Henning;M. Sitko;J. C. C. S. Mayama-J.-C.-C.-S.-Mayama-1401890576;T. Currie;C. Thalmann;J. Wisniewski;M. Momose;N. Ohashi;L. Abe;W. Brandner;Timothy D. Brandt;S. Egner;M. Feldt;M. Goto;O. Guyon;Y. Hayano;M. Hayashi;S. Hayashi;K. Hodapp;M. Ishi;M. Iye;G. Knapp;T. Matsuo;M. McElwain;S. Miyama;J. Morino;A. Moro-Martin;T. Nishimura;T. Pyo;G. Serabyn;T. Suenaga;H. Suto;R. Suzuki;Y. Takahashi;N. Takato;H. Terada;D. Tomono;E. Turner;M. Watanabe;T. Yamada;H. Takami;T. Usuda;M. Tamura

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我们展示了与 TW Hydrae 相关的附近过渡盘的新 Subaru/HiCIAO 高对比度 H 波段偏振强度 (PI) 图像。圆盘的散射光在 0.″ 2 到 1.″ 5 (11–81 AU) 范围内被检测到，PI 图像显示 PI 中距中央恒星 ∼0.″ 4 (∼20 AU) 处有明显的轴对称凹陷，类似于之前从哈勃太空望远镜图像中报道的 ∼80 AU 间隙。方位角 PI 剖面还表明，超过 0." 2 的圆盘几乎是轴对称的。我们讨论了解释 PI 凹陷起源的两种可能情况：（1）由于 PI 剖面中看到的浅坡度，在距中心恒星约 20 个天文单位处可能存在间隙结构，（2）晶粒生长可能发生在盘的内部区域。近红外和毫米/亚毫米波长的多波段观测在研究灰尘不透明度方面发挥着补充作用，可能有助于更准确地揭示间隙的起源。
We present a new Subaru/HiCIAO high-contrast H-band polarized intensity (PI) image of a nearby transitional disk associated with TW Hydrae. The scattered light from the disk was detected from 0.″ 2 to 1.″ 5 (11–81 AU) and the PI image shows a clear axisymmetric depression in PI at ∼0.″ 4 (∼20 AU) from the central star, similar to the ∼80 AU gap previously reported from Hubble Space Telescope images. The azimuthal PI profile also shows that the disk beyond 0.″ 2 is almost axisymmetric. We discuss two possible scenarios explaining the origin of the PI depression: (1) a gap structure may exist at ∼20 AU from the central star because of a shallow slope seen in the PI profile, and (2) grain growth may be occurring in the inner region of the disk. Multi-band observations at near-infrared and millimeter/submillimeter wavelengths play a complementary role in investigating dust opacity and may help reveal the origin of the gap more precisely.