@article{bc91d4870c66478084e53268d951be93,
title = "Early Planet Formation in Embedded Disks (eDisk). XXII. Keplerian Disk, Disk Structures, and Jets/Outflows in the Class 0 Protostar IRAS 04166+2706",
abstract = "We present Atacama Large Millimeter/submillimeter Array (ALMA) observations of the Class 0 protostar IRAS 04166+2706, obtained as part of the ALMA Large Program Early Planet Formation in Embedded Disks. These observations were made in the 1.3 mm dust continuum and molecular lines at angular resolutions of ∼ 0 . ″ 05 (∼8 au) and ∼ 0 . ″ 16 (∼25 au), respectively. The continuum emission shows a disklike structure with a radius of ∼22 au. Kinematical analysis of 13CO (2-1), C18O (2-1), H2CO (30,3-20,2), CH3OH (42-31) emission demonstrates that these molecular lines trace the infalling-rotating envelope and possibly a Keplerian disk, enabling us to estimate the protostar mass to be 0.15 M⊙ < M⋆ < 0.39 M⊙. The dusty disk is found to exhibit a brightness asymmetry along its minor axis in the continuum emission, probably caused by a flared distribution of the dust and the high optical depth of the dust emission. In addition, the 12CO (2-1) and SiO (5-4) emissions show knotty and wiggling motions in the jets. Our high-angular-resolution observations revealed the most recent mass ejection events, which have occurred within the last ∼25 yr.",
author = "Phuong, \{Nguyen Thi\} and Lee, \{Chang Won\} and Tobin, \{John J.\} and Nagayoshi Ohashi and J{\o}rgensen, \{Jes K.\} and Shigehisa Takakuwa and Yuri Aikawa and Yusuke Aso and Li, \{Zhi Yun\} and Koch, \{Patrick M.\} and Williams, \{Jonathan P.\} and Sacha Gavino and Lin, \{Zhe Yu Daniel\} and Kengo Tomida and Woojin Kwon and Looney, \{Leslie W.\} and Ilseung Han and Alejandro Santamar{\'i}a-Miranda and Lai, \{Shih Ping\} and Yen, \{Hsi Wei\} and Thieme, \{Travis J.\} and Jinshi Sai and Christian Flores",
note = "We are grateful to the anonymous reviewer for valuable comments. This paper makes use of the following ALMA data: ADS/JAO.ALMA\#2019.1.00261.L. ALMA is a partnership of ESO (representing its member states), NSF (USA) and NINS (Japan), together with NRC (Canada), MOST and ASIAA (Taiwan), and KASI (Republic of Korea), in cooperation with the Republic of Chile. The Joint ALMA Observatory is operated by ESO, AUI/NRAO, and NAOJ. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. C.W.L. was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (NRF-2019R1A2C1010851), and by the Korea Astronomy and Space Science Institute grant funded by the Korea government (MSIT; project No. 2024-1-841-00). J.J.T. acknowledges support from NASA XRP 80NSSC22K1159. Z.Y.L. is supported in part by NASA 80NSSC20K0533 and NSF AST-2307199 and AST-1910106. J.K.J. and S.G. acknowledge support from the Independent Research Fund Denmark (grant No. 0135-00123B). S.T. is supported by JSPS KAKENHI grant Nos. 21H00048 and 21H04495. This research is funded by the Vietnam Academy of Science and Technology under grant No. VAST08.02/25-26. This work was supported by NAOJ ALMA Scientific Research Grant Code 2022-20A. This work was partly supported by a grant from the Simons Foundation to IFIRSE, ICISE(916424;N.H.). L.W.L. acknowledges support from NSF AST-2108794. Z.Y.D.L. acknowledges support from NASA 80NSSCK1095, the Jefferson Scholars Foundation, the NRAO ALMA Student Observing Support (SOS) SOSPA8-003, the Achievements Rewards for College Scientists (ARCS) Foundation Washington Chapter, the Virginia Space Grant Consortium (VSGC), and UVA research computing (RIVANNA). N.O. and C.F. acknowledge support from the National Science and Technology Council (NSTC) in Taiwan through NSTC 113-2112-M-001-037 and from the Academia Sinica Investigator Project Grant AS-IV-114-M02. H.-W.Y. acknowledges support from the National Science and Technology Council (NSTC) in Taiwan through the grant NSTC 114-2112-M-001-017 and from the Academia Sinica Career Development Award (AS-CDA-111-M03). W.K. is supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (RS-2024-00342488). I.H. acknowledges funding from the European Research Council (ERC) under the European Union{\textquoteright}s Horizon 2020 research and innovation program (grant agreement No. 101098309 - PEBBLES). Y.A. is supported by JSPSKAKENHI grant No. 24K00674.",
year = "2025",
month = oct,
day = "10",
doi = "10.3847/1538-4357/adfa92",
language = "English (US)",
volume = "992",
journal = "Astrophysical Journal",
issn = "0004-637X",
publisher = "American Astronomical Society",
number = "1",
}