Near-infrared High-resolution Imaging Polarimetry of FU Ori-type Objects: Toward a Unified Scheme for Low-mass Protostellar Evolution

Michihiro Takami, Guangwei Fu, Hauyu Baobab Liu, Jennifer L. Karr, Jun Hashimoto, Tomoyuki Kudo, Eduard I. Vorobyov, Ágnes Kóspál, Peter Scicluna, Ruobing Dong, Motohide Tamura, Tae-Soo Pyo (+5 others)
2018 Astrophysical Journal  
We present near-IR imaging polarimetry of five classical FU Ori-type objects (FU Ori, V1057 Cyg, V1515 Cyg, V1735 Cyg, Z CMa) with a $\sim$0\farcs1 resolution observed using HiCIAO+AO188 at 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
more » ... ed 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.
doi:10.3847/1538-4357/aad2e1 fatcat:qfuerme4g5cvbpw6ow7dbanht4