SCExAO/CHARIS High-contrast Imaging of Spirals and Darkening Features in the HD 34700 A Protoplanetary Disk
SCExAO/CHARIS High-contrast Imaging of Spirals and Darkening Features in the HD 34700 A Protoplanetary Disk
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DOI：
10.3847/1538-4357/aba8f6
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发表时间：
2020-07
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通讯作者：
T. Uyama;T. Currie;V. Christiaens;J. Bae;T. Muto;Sanemichi Z. Takahashi;R. Tazaki;M. Ygouf
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作者：
T. Uyama;T. Currie;V. Christiaens;J. Bae;T. Muto;Sanemichi Z. Takahashi;R. Tazaki;M. Ygouf
我们展示了 HD 34700 A 的 Subaru/SCExAO+冠状高角分辨率成像光谱仪 (CHARIS) 宽带（JHK 波段）积分场光谱。CHARIS 数据恢复了 HD 34700 A 的盘环并确认了 Monnier 等人发现的多个螺旋。我们将 ∼12 MJup 的亚恒星伴星限制在 0.″3（环隙内），将 ∼5 MJup 限制在 0.″75（环外）。数据揭示了环和螺旋上的变暗效应，尽管我们没有确定每个特征的起源，例如与外螺旋相关的阴影或物理特征。从表面亮度转换而来的几何反照率表明，在~45°和90°之间的位置角处存在更大的尺度高度和/或显着丰富的亚微米灰尘。螺旋拟合导致非常大的螺距角（∼30°–50°）； HD 34700 B 的恒星飞越或从可能的包络线坠落也许是解释大俯仰角的合理场景。
We present Subaru/SCExAO+Coronagraphic High Angular Resolution Imaging Spectrograph (CHARIS) broadband (JHK-band) integral field spectroscopy of HD 34700 A. CHARIS data recover HD 34700 A’s disk ring and confirm multiple spirals discovered by Monnier et al. We set limits on substellar companions of ∼12 MJup at 0.″3 (in the ring gap) and ∼5 MJup at 0.″75 (outside the ring). The data reveal darkening effects on the ring and spiral, although we do not identify the origin of each feature such as shadows or physical features related to the outer spirals. Geometric albedos converted from the surface brightness suggest a greater scale height and/or prominently abundant submicron dust at position angles between ∼45° and 90°. Spiral fitting resulted in very large pitch angles (∼30°–50°); a stellar flyby of HD 34700 B or infall from a possible envelope is perhaps a reasonable scenario to explain the large pitch angles.