arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2008.00309astro-ph.EP
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HD 15115碎片盘的SCExAO/CHARIS近红外积分场光谱

SCExAO/CHARIS Near-IR Integral Field Spectroscopy of the HD 15115 Debris Disk

Kellen Lawson, Thayne Currie, John P. Wisniewski, Motohide Tamura, Glenn Schneider, Jean-Charles Augereau, Timothy D. Brandt, Olivier Guyon, N. Jeremy Kasdin, T… 展开作者

Kellen Lawson, Thayne Currie, John P. Wisniewski, Motohide Tamura, Glenn Schneider, Jean-Charles Augereau, Timothy D. Brandt, Olivier Guyon, N. Jeremy Kasdin, Tyler D. Groff, Julien Lozi, Jeffrey Chilcote, Klaus Hodapp, Nemanja Jovanovic, Frantz Martinache, Nour Skaf, Eiji Akiyama, Thomas Henning, Gillian R. Knapp, Jungmi Kwon, Satoshi Mayama, Michael W. McElwain, Michael L. Sitko, Ruben Asensio-Torres, Taichi Uyama, Kevin Wagner

摘要:

我们提出了新的,近红外($1.1 - 2.4$ $μm$)高对比度成像的碎片盘周围的HD 15115与斯巴鲁Coronagraphic极端自适应光学系统(SCExAO)加上Coronagraphic高角分辨率成像光谱仪(CHARIS)。SCExAO/CHARIS将磁盘解析为$ρ\sim 0.2''$($\rm{r_{proj}} \sim 10$ $\rm{au}$),$\sim 3-5$的一个因子小于先前的最新研究。我们导出了$\rm{PA}$ $\sim 279.4^\circ - 280.5^\circ$的圆盘位置角和$\rm{i}$ $\sim 85.3^\circ - 86.2^\circ$的倾角。虽然最近的SPHERE/IRDIS图像可能表明该系统的两个环盘几何形状明显不一致,但CHARIS图像并没有为这一假设提供确凿的证据。此外,优化模型的一个和两个环的几何形状,使用差分进化,我们发现,一个单一的环具有洪散射相函数匹配的数据同样很好的CHARIS视野内($ρ\lesssim 1''$)。星盘的不对称性,在较大的分离处得到了很好的证明,也得到了恢复;星盘的西侧在$0.25''$和$1''$之间的CHARIS带通上平均亮约0.4等。比较STIS/50 CCD光学光度法($2000-10500$ $Å$)与CHARIS近红外光度法,我们发现在整个$0.4'' - 1''$重叠区域,光盘两侧的红色(STIS/50 CCD $-$ CHARIS宽带),与$\sim 2''$外部区域在类似波长下报告的蓝色形成对比。此外,该颜色可能表明比先前在较大分离处估计的更小的最小晶粒尺寸。最后,我们提供了对行星同伴的限制,并讨论了所观察到的内盘通量不对称性和颜色的可能机制。

英文摘要:

We present new, near-infrared ($1.1 - 2.4$ $μm$) high-contrast imaging of the debris disk around HD 15115 with the Subaru Coronagraphic Extreme Adaptive Optics system (SCExAO) coupled with the Coronagraphic High Angular Resolution Imaging Spectrograph (CHARIS). SCExAO/CHARIS resolves the disk down to $ρ\sim 0.2''$ ($\rm{r_{proj}} \sim 10$ $\rm{au}$), a factor of $\sim 3-5$ smaller than previous recent studies. We derive a disk position angle of $\rm{PA}$ $\sim 279.4^\circ - 280.5^\circ$ and an inclination of $\rm{i}$ $\sim 85.3^\circ - 86.2^\circ$. While recent SPHERE/IRDIS imagery of the system could suggest a significantly misaligned two ring disk geometry, CHARIS imagery does not reveal conclusive evidence for this hypothesis. Moreover, optimizing models of both one and two ring geometries using differential evolution, we find that a single ring having a Hong-like scattering phase function matches the data equally well within the CHARIS field of view ($ρ\lesssim 1''$). The disk's asymmetry, well-evidenced at larger separations, is also recovered; the west side of the disk appears on average around 0.4 magnitudes brighter across the CHARIS bandpass between $0.25''$ and $1''$. Comparing STIS/50CCD optical photometry ($2000-10500$ $Å$) with CHARIS NIR photometry, we find a red (STIS/50CCD$-$CHARIS broadband) color for both sides of the disk throughout the $0.4'' - 1''$ region of overlap, in contrast to the blue color reported at similar wavelengths for regions exterior to $\sim 2''$. Further, this color may suggest a smaller minimum grain size than previously estimated at larger separations. Finally, we provide constraints on planetary companions, and discuss possible mechanisms for the observed inner disk flux asymmetry and color.

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