论文标题
高对比度成像，围绕2 myr龄的Ci Tau与近距离气体巨头
High-contrast Imaging around a 2 Myr-old CI Tau with a Close-in Gas Giant
论文作者
论文摘要
年轻恒星周围的巨型行星是揭示其形成史和轨道进化的线索。 Ci Tau是一位2 \，Myr旧的古典T-Tauri星，拥有一位古怪的热木星，Ci Tau \，b。热木星的标准形成场景预测，行星进一步形成并向内迁移。 Ci Tau B的高偏心率可能暗示着由于外部伴侣的世俗重力扰动而引起的高$ E $迁移。同样，ALMA 1.3 \，MM-continuum观察结果表明，Ci Tau至少存在三个环形间隙，其中可能存在看不见的行星。我们提出了围绕keck/nirc2 $ l^{\ prime} $的Ci Tau的高对比度成像 - 带滤波器和涡旋coronagraph，使我们能够搜索外部伴侣。我们没有使用两个深度成像数据集从角度差异成像（ADI）中检测到Ci Tau周围的任何外伴侣。来自Adi-Red映像的检测限制排除了$ \ sim30 $ \，Au的外部伴侣的存在，该外壳可能导致Ci tau \，b的Kozai-Lidov迁移。我们的结果表明，Ci Tau \，B可能经历了II型迁移，从$ \ Lessim 2 $ \，Au中的Myrs中的迁移。我们还确认没有$ \ geq 2-4 \，m_ \ mathrm {jup} $的行星隐藏在两个外部间隙中。
Giant planets around young stars serve as a clue to unveiling their formation history and orbital evolution. CI Tau is a 2\,Myr-old classical T-Tauri star hosting an eccentric hot Jupiter, CI Tau\,b. The standard formation scenario of a hot Jupiter predicts that planets formed further out and migrated inward. A high eccentricity of CI Tau b may be suggestive of high-$e$ migration due to secular gravitational perturbations by an outer companion. Also, ALMA 1.3\,mm-continuum observations show that CI Tau has at least three annular gaps in which unseen planets may exist. We present high-contrast imaging around CI Tau taken from Keck/NIRC2 $L^{\prime}$-band filter and vortex coronagraph that allows us to search for an outer companion. We did not detect any outer companion around CI Tau from angular differential imaging (ADI) using two deep imaging data sets. The detection limits from ADI-reduced images rule out the existence of an outer companion beyond $\sim30$\,au that can cause the Kozai-Lidov migration of CI Tau\,b. Our results suggest that CI Tau\,b may have experienced Type II migration from $\lesssim 2$\,au in Myrs. We also confirm that no planets with $\geq 2-4\,M_\mathrm{Jup}$ are hidden in two outer gaps.
