ALMA Study of Binary Star Formation

• Project/Area Number: 16H07086
• Research Category: Grant-in-Aid for Research Activity Start-up
• Allocation Type: Single-year Grants
• Research Field: Astronomy
• Research Institution: Kagoshima University
• Principal Investigator: TAKAKUWA Shigehisa 鹿児島大学, 理工学域理学系, 教授 (50777555)
• Project Period (FY): 2016-08-26 – 2018-03-31
• Project Status: Completed (Fiscal Year 2017)
• Budget Amount: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000); Fiscal Year 2017: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2016: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
• Keywords: 連星系形成 / ALMA望遠鏡 / 電波天文学 / 連星形成 / アルマ望遠鏡

Outline of Final Research Achievements

To understand how twin stars orbiting around each other, binaries, form, we have performed Atacama Large Millimeter / submillimeter Array (ALMA) observations of circumbinary disks of molecular gas and dusts in protostellar binaries. We found that in the protostellar binary L1551 NE the circumbinary disk consists of two-arm features, and the materials in the circumbinary disk is being accreted onto the protostellar binary. ALMA observations of another protostellar binary, L1551 IRS 5, on the other hand, do not reveal such arm-like structures in the circumbinary disk. These results imply that mass accretion onto the protostellar binary should depend on the binary mass ratio and the centrifugal radii of the circumbinary disk.

Research Products

• [Int'l Joint Research] 台湾中央研究院天文及天文物理 研究所(台湾)
• [Int'l Joint Research] 香港大學(香港)
• [Int'l Joint Research] 台湾中央研究院天文及天文物理研究所(台湾)
• [Int'l Joint Research] 香港大學(香港)
• [Journal Article] Polarization Properties and Magnetic Field Structures in the High-mass Star-forming Region W51 Observed with ALMA (2018)
  • Author(s): Koch Patrick M.、Tang Ya-Wen、Ho Paul T. P.、Yen Hsi-Wei、Su Yu-Nung、Takakuwa Shigehisa
  • Journal Title: The Astrophysical Journal Volume: 855 Issue: 1 Pages: 39-39
  • DOI: 10.3847/1538-4357/aaa4c1
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] 1000 au exterior arcs connected to the protoplanetary disk around HL Tauri (2017)
  • Author(s): Yen Hsi-Wei、Takakuwa Shigehisa、Chu You-Hua、Hirano Naomi、Ho Paul T. P.、Kanagawa Kazuhiro D.、Lee Chin-Fei、Liu Hauyu Baobab、Liu Sheng-Yuan、Matsumoto Tomoaki、Matsushita Satoki、Muto Takayuki、Saigo Kazuya、Tang Ya-Wen、Trejo Alfonso、Wu Chun-Ju
  • Journal Title: The Astrophysical Journal Volume: 608 Pages: A134-A134
  • DOI: 10.1051/0004-6361/201730894
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] ALMA Observations of SMM11 Reveal an Extremely Young Protostar in Serpens Main Cluster (2017)
  • Author(s): Aso Yusuke、Ohashi Nagayoshi、Aikawa Yuri、Machida Masahiro N.、Saigo Kazuya、Saito Masao、Takakuwa Shigehisa、Tomida Kengo、Tomisaka Kohji、Yen Hsi-Wei、Williams Jonathan P.
  • Journal Title: The Astrophysical Journal Volume: 850 Issue: 1 Pages: L2-L2
  • DOI: 10.3847/2041-8213/aa9701
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] ALMA Observations of the Protostar L1527 IRS: Probing Details of the Disk and the Envelope Structures (2017)
  • Author(s): Aso Yusuke、Ohashi Nagayoshi、Aikawa Yuri、Machida Masahiro N.、Saigo Kazuya、Saito Masao、Takakuwa Shigehisa、Tomida Kengo、Tomisaka Kohji、Yen Hsi-Wei
  • Journal Title: The Astrophysical Journal Volume: 849 Issue: 1 Pages: 56-56
  • DOI: 10.3847/1538-4357/aa8264
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] How Do Stars Gain Their Mass? A JCMT/SCUBA-2 Transient Survey of Protostars in Nearby Star-forming Regions (2017)
  • Author(s): Herczeg Gregory J.、Johnstone Doug、Mairs Steve、et al. (Shigehisa Takakuwa)
  • Journal Title: The Astrophysical Journal Volume: 849 Issue: 1 Pages: 43-43
  • DOI: 10.3847/1538-4357/aa8b62
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Signs of Early-stage Disk Growth Revealed with ALMA (2017)
  • Author(s): Yen, Hsi-Wei; Koch, Patrick M.; Takakuwa, Shigehisa; Krasnopolsky, Ruben; Ohashi, Nagayoshi; Aso, Yusuke
  • Journal Title: The Astrophysical Journal Volume: 834 Issue: 2 Pages: 178-178
  • DOI: 10.3847/1538-4357/834/2/178
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Spiral Arms, Infall, and Misalignment of the Circumbinary Disk from the Circumstellar Disks in the Protostellar Binary System L1551 NE (2016)
  • Author(s): Takakuwa, Shigehisa; Saigo, Kazuya; Matsumoto, Tomoaki; Saito, Masao; Lim, Jeremy; Hanawa, Tomoyuki; Yen, Hsi-Wei; Ho, Paul T. P.
  • Journal Title: The Astrophysical Journal Volume: 837 Issue: 1 Pages: 86-99
  • DOI: 10.3847/1538-4357/aa6116
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Tracing Infall and Rotation along the Outflow Cavity Walls of the L483 Protostellar Envelope (2016)
  • Author(s): Leung, Gigi Y. C.; Lim, Jeremy; Takakuwa, Shigehisa
  • Journal Title: The Astrophysical Journal Volume: 833 Issue: 1 Pages: 55-55
  • DOI: 10.3847/1538-4357/833/1/55
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Stacking Spectra in Protoplanetary Disks: Detecting Intensity Profiles from Hidden Molecular Lines in HD 163296 (2016)
  • Author(s): Yen, Hsi-Wei; Koch, Patrick M.; Liu, Hauyu Baobab; Puspitaningrum, Evaria; Hirano, Naomi; Lee, Chin-Fei; Takakuwa, Shigehisa
  • Journal Title: The Astrophysical Journal Volume: 832 Issue: 2 Pages: 204-204
  • DOI: 10.3847/0004-637x/832/2/204
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Formation of the Unequal-mass Binary Protostars in L1551NE by Rotationally driven Fragmentation (2016)
  • Author(s): Jeremy Lim, Tomoyuki Hanawa, Paul K. H. Yeung, Shigehisa Takakuwa, Tomoaki Matsumoto, and Kazuya Saigo
  • Journal Title: The Astrophysical Journal Volume: 831 Issue: 1 Pages: 90-102
  • DOI: 10.3847/0004-637x/831/1/90
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Rotationally driven Fragmentation in the Formation of the Binary Protostellar System L1551 IRS (2016)
  • Author(s): J. Lim, Paul K. H. Yeung, T. Hanawa, S. Takakuwa, T. Matsumoto, K. Saigo
  • Journal Title: The Astrophysical Journal Volume: 826 Issue: 2 Pages: 153-172
  • DOI: 10.3847/0004-637x/826/2/153
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Gas Gaps in the Protoplanetary Disk around the Young Protostar HL Tau (2016)
  • Author(s): Yen, Hsi-Wei; Liu, Hauyu Baobab; Gu, Pin-Gao; Hirano, Naomi; Lee, Chin-Fei; Puspitaningrum, Evaria; Takakuwa, Shigehisa
  • Journal Title: The Astrophysical Journal Letters Volume: 820 Issue: 2 Pages: L25-L25
  • DOI: 10.3847/2041-8205/820/2/l25
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Presentation] ALMA Verification of Counter-rotating Protostellar Envelopes (2018)
  • Author(s): Shigehisa Takakuwa
  • Organizer: Star Formation with ALMA: Evolution from Dense Cores to Protostar
  • Int'l Joint Research / Invited
• [Presentation] Counter-Rotation between the Disk and Envelope around IRAS 04169+2702 (2017)
  • Author(s): Shigehisa Takakuwa, Yusuke Tsukamoto, Kazuya Saigo, & Masao Saito
  • Organizer: East-Asian ALMA Science Workshop 2016
  • Place of Presentation: Hsinchu (Taiwan)
  • Year and Date: 2017-03-10
  • Int'l Joint Research
• [Presentation] Torsionally-Excited CH3OH Line as a Direct Tracer of the First Core with the ALMA Band 1 Observation (2017)
  • Author(s): Shigehisa Takakuwa, Kazuya Saigo, & Naomi Hirano
  • Organizer: ALMA Band 1 Science Workshop
  • Place of Presentation: Taipei (Taiwan)
  • Year and Date: 2017-01-16
  • Int'l Joint Research
• [Presentation] ALMA Study of the Protostellar Binary System L1551 NE; Spiral Arms, Infall, and Misalignment of the Circumbinary Disk from the Circumstellar Disks (2017)
  • Author(s): Shigehisa Takakuwa
  • Organizer: 2017 Asia-Pacific Regional IAU meeting
  • Int'l Joint Research
• [Presentation] Counter-rotating, Infalling Envelope around the central Keplerian Disk in IRAS 04169+2702 (2017)
  • Author(s): 高桑 繁久
  • Organizer: 京都大学 基研研究会「原始惑星系円盤」
  • Invited
• [Presentation] 天の川銀河における連星形成の多様性 (2017)
  • Author(s): 高桑 繁久
  • Organizer: 天の川銀河研究会2017
• [Presentation] CASA Users Committee Report (2017)
  • Author(s): Shigehisa Takakuwa
  • Organizer: ALMA/45m/ASTE Users Meeting 2017
  • Int'l Joint Research / Invited
• [Presentation] ALMAによる HL Tau の最新の観測結果 (2017)
  • Author(s): 高桑 繁久
  • Organizer: 電波天文学によるサイエンスの到達点と未来を俯瞰する