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JWST/NIRCam Imaging of Young Stellar Objects. III. Detailed Imaging of the Nebular Environment around the HL Tau Disk
The Astronomical Journal ( IF 5.3 ) Pub Date : 2024-03-27 , DOI: 10.3847/1538-3881/ad2de9
Camryn Mullin , Ruobing Dong , Jarron Leisenring , Gabriele Cugno , Thomas Greene , Doug Johnstone , Michael R. Meyer , Kevin R. Wagner , Schuyler G. Wolff , Martha Boyer , Scott Horner , Klaus Hodapp , Don McCarthy , George Rieke , Marcia Rieke , Erick Young

As part of the James Webb Space Telescope (JWST) Guaranteed Time Observation program “Direct Imaging of YSOs” (program ID 1179), we use JWST NIRCam’s direct imaging mode in F187N, F200W, F405N, and F410M to perform high-contrast observations of the circumstellar structures surrounding the protostar HL Tau. The data reveal the known stellar envelope, outflow cavity, and streamers, but do not detect any companion candidates. We detect scattered light from an inflowing spiral streamer previously detected in HCO+ by the Atacama Large Millimeter/submillimeter Array, and part of the structure connected to the c-shaped outflow cavity. For detection limits in planet mass we use BEX evolutionary tracks when M p < 2 M J and AMES-COND evolutionary tracks otherwise, assuming a planet age of 1 Myr (youngest available age). Inside the disk region, due to extended envelope emission, our point-source sensitivities are ∼5 mJy (37 M J) at 40 au in F187N and ∼0.37 mJy (5.2 M J) at 140 au in F405N. Outside the disk region, the deepest limits we can reach are ∼0.01 mJy (0.75 M J) at a projected separation ∼ 525 au.

中文翻译:

年轻恒星物体的 JWST/NIRCam 成像。三. HL Tau 盘周围星云环境的详细成像

作为詹姆斯·韦伯太空望远镜 (JWST) 保证时间观测计划“YSO 直接成像”(计划 ID 1179)的一部分,我们在 F187N、F200W、F405N 和 F410M 中使用 JWST NIRCam 的直接成像模式对 YSO 进行高对比度观测原恒星 HL Tau 周围的星周结构。数据揭示了已知的恒星包层、流出腔和流光,但没有检测到任何伴星候选者。我们检测到了先前由阿塔卡马大型毫米/亚毫米阵列在 HCO +中检测到的流入螺旋流光的散射光,以及连接到 c 形流出腔的部分结构。对于行星质量的检测极限,我们在以下情况下使用 BEX 进化轨迹:中号 p <2中号 J和 AMES-COND 的演化轨迹则不然,假设行星年龄为 1 Myr(最年轻的可用年龄)。在圆盘区域内,由于扩展的包络发射,我们的点源灵敏度为 ∼5 mJy (37中号 J ) 在 F187N 中的 40 au 和 ∼0.37 mJy (5.2中号 J ) 在 F405N 中 140 个天文单位。在磁盘区域之外,我们可以达到的最深极限是 ∼0.01 mJy (0.75中号 J ) 预计间距 ∼ 525 au。
更新日期:2024-03-27
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