AI 中文总结
研究TW Hya这一距地球最近的原行星盘，用JWST/NIRCam进行高对比度日冕成像，检测散射光发射，拟合盘图像参数，搜索伴星并确定质量限制，还确认外盘特征，展示了JWST对原行星盘结构的表征及对形成中天体属性的约束能力。
AI 中文摘要
TW Hya是距离地球最近的原行星盘（d = 60.14秒差距），是研究最多的原行星盘之一，也是检验行星形成理论的关键基准。本文展示了詹姆斯·韦布空间望远镜/近红外相机对TW Hya盘在四个滤光片（F187N、F200W、F356W和F444W）下的高对比度日冕成像。在F200W、F356W和F444W中检测到了盘的散射光发射。对盘图像进行椭圆拟合，得到平均倾角i = 8.74^{+1.03}_{-0.94}度，方位角PA = 75.62^{+7.86}_{-6.56}度。发现这些参数存在径向变化的初步证据，这一趋势与盘翘曲一致。伴星搜索未发现新天体，确定了可能造成尘埃间隙的伴星的最低质量限制。假设无局部消光且系统年龄为1000万年，F444W数据在1角秒（约60天文单位）的间距下对低至约0.4木星质量的天体敏感。考虑到类似于AS 209系统的局部盘消光，在2角秒以外的质量限制达到亚木星质量。此外，分析提供了外盘中约120天文单位处先前检测到的特征的详细视图，确认其形态为独特的分叉结构。该特征可能表明存在由动态行星 - 盘相互作用产生的复杂子结构。这些结果证明了詹姆斯·韦布空间望远镜表征原行星盘结构和约束形成中天体属性 的能力。
英文摘要
As the nearest protoplanetary disk to Earth ($d = 60.14$ pc), TW Hya is one of the most studied protoplanetary disks and a critical benchmark for testing planet formation theories. We present high-contrast coronagraphic imaging of the TW Hya disk from JWST/NIRCam across four filters (F187N, F200W, F356W, and F444W). We detect the disk's scattered-light emission in F200W, F356W, and F444W. An elliptical fit to the disk image yields an average inclination of $i = 8.74^{+1.03}_{-0.94}$ degrees and a position angle of $\mathrm{PA} = 75.62^{+7.86}_{-6.56}$ degrees. We find tentative evidence for radial variations in these parameters, a trend consistent with a disk warp. Our companion search yields no new detections, placing the lowest mass limits yet on companions that might be responsible for carving out the dust gap. Assuming no local extinction and a system age of 10 Myr, the F444W data are sensitive to masses down to $\sim 0.4\,M_{\rm Jup}$ at separations of $1$ arcsec ($\sim 60$ AU). Accounting for local disk extinction analogous to the AS 209 system, our limits reach sub-Jupiter masses beyond $2$ arcsec. Furthermore, our analysis provides a detailed view of a previously detected feature in the outer disk at $\sim 120$ AU, confirming its morphology as a distinct bifurcation structure. This feature may indicate the presence of complex substructures arising from dynamical planet-disk interactions. These results demonstrate JWST's ability to characterize the architecture of protoplanetary disks and constrain the properties of forming worlds.
Comments31 pages, 14 figures, 7 tables. Accepted for publication in The Astronomical Journal (AJ)
