Near-infrared High-resolution Imaging Polarimetry of FU Ori-type Objects: Toward a Unified Scheme for Low-mass Protostellar Evolution
Near-infrared High-resolution Imaging Polarimetry of FU Ori-type Objects: Toward a Unified Scheme for Low-mass Protostellar Evolution
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DOI：
10.3847/1538-4357/aad2e1
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发表时间：
2018-07
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通讯作者：
M. Takami;Guangwei Fu;H. Liu;J. Karr;J. Hashimoto;T. Kudo;E. Vorobyov;Á. Kóspál;P. Scicluna;R. Dong;M. Tamura;T. Pyo;M. Fukagawa;T. Tsuribe;M. Dunham;T. Henning;J. D. Leon
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作者：
M. Takami;Guangwei Fu;H. Liu;J. Karr;J. Hashimoto;T. Kudo;E. Vorobyov;Á. Kóspál;P. Scicluna;R. Dong;M. Tamura;T. Pyo;M. Fukagawa;T. Tsuribe;M. Dunham;T. Henning;J. D. Leon
我们展示了五个经典 FU Ori 型天体（FU Ori、V1057 Cyg、V1515 Cyg、V1735 Cyg、Z CMa）的近红外成像偏振测量，使用 HiCIAO+AO188 在斯巴鲁望远镜上观察到分辨率为 ∼0.”1。我们观察到与其中四个（即除 V1515 Cyg 之外的所有）周围的星周尘埃相关的散射光。它们的偏振强度分布显示出多种形态，包括臂、尾或流、尖峰和碎片分布，其中许多在我们之前的论文中已经报道过。这些反射星云的形态与许多其他正常的年轻恒星物体（I-II 类物体）显着不同。这些结构归因于引力不稳定的圆盘、团块喷射的痕迹、风或喷气机吹起的尘埃以及恒星伴星。我们可以一致地解释我们的结果，假设它们的吸积爆发（FU或爆发）是由引力碎片盘触发的，并假设许多低质量的年轻恒星物体经历了这种爆发。
We present near-IR imaging polarimetry of five classical FU Ori-type objects (FU Ori, V1057 Cyg, V1515 Cyg, V1735 Cyg, Z CMa) with an ∼0.″1 resolution observed using HiCIAO+AO188 at the Subaru Telescope. We observed scattered light associated with circumstellar dust around four of them (i.e., all but V1515 Cyg). Their polarized intensity distribution shows a variety of morphologies with arms, tails or streams, spikes, and fragmented distributions, many of which were reported in our previous paper. The morphologies of these reflection nebulae significantly differ from many other normal young stellar objects (Class I–II objects). These structures are attributed to gravitationally unstable disks, trails of clump ejections, dust blown by a wind or a jet, and a stellar companion. We can consistently explain our results with the scenario that their accretion outbursts (FUor outbursts) are triggered by gravitationally fragmenting disks, and with the hypothesis that many low-mass young stellar objects experience such outbursts.