TW Hya过渡盘中系外行星的约束吸积特征
Constraining accretion signatures of exoplanets in the TW Hya transitional disk
摘要：
我们提出了一个近红外直接成像搜索周围的年轻恒星对象（YSO）TW Hya，一个多环盘表现出行星形成的证据可能的原行星吸积签名。Pa $β$线（1.282 $μ$ m）是原行星吸积的指示，其强度远高于原行星的黑体辐射。我们专注于Pa $β$线，并进行了Keck/OSIRIS光谱观测。虽然光谱差分成像（SDI）减少检测没有吸积签名，本研究的结果允许我们设置5 $σ$检测限Pa $β$发射的$5.8\times10^{-18}$和$1.5\times10^{-18}$ erg/s/cm $^2$ 0 \farcs 4和1 \farcs 6，分别。我们考虑了潜在行星的质量，使用理论模拟的环行星盘和氢排放。得到的质量分别为25和95 AU的$1.45\pm 0.04$ M $_{\rm J}$和$2.29 ^{+0.03}_{-0.04}$ M $_{\rm J}$，这与先前宽带成像获得的检测限一致。探测极限应该允许识别小到$\sim$ 1 M $_{\rm J}$的原行星，这可能有助于在极端自适应光学仪器无法获得的微弱YSO周围进行直接成像搜索。
英文摘要：
We present a near-infrared direct imaging search for accretion signatures of possible protoplanets around the young stellar object (YSO) TW Hya, a multi-ring disk exhibiting evidence of planet formation. The Pa$β$ line (1.282 $μ$m) is an indication of accretion onto a protoplanet, and its intensity is much higher than that of blackbody radiation from the protoplanet. We focused on the Pa$β$ line and performed Keck/OSIRIS spectroscopic observations. Although spectral differential imaging (SDI) reduction detected no accretion signatures, the results of the present study allowed us to set 5$σ$ detection limits for Pa$β$ emission of $5.8\times10^{-18}$ and $1.5\times10^{-18}$ erg/s/cm$^2$ at 0\farcs4 and 1\farcs6, respectively. We considered the mass of potential planets using theoretical simulations of circumplanetary disks and hydrogen emission. The resulting masses were $1.45\pm 0.04$ M$_{\rm J}$ and $2.29 ^{+0.03}_{-0.04}$ M$_{\rm J}$ at 25 and 95 AU, respectively, which agree with the detection limits obtained from previous broadband imaging. The detection limits should allow the identification of protoplanets as small as $\sim$1 M$_{\rm J}$, which may assist in direct imaging searches around faint YSOs for which extreme adaptive optics instruments are unavailable.
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