Binary formation in Lupus Molecular Clouds with high resolution NIR and Radio observations

• Project/Area Number: 16K05303
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Astronomy
• Research Institution: National Astronomical Observatory of Japan
• Principal Investigator: Saito Masao 国立天文台, TMT推進室, 教授 (90353424)
• Co-Investigator(Kenkyū-buntansha): 西合 一矢 国立天文台, アルマプロジェクト, 特任助教 (30399290)
• Research Collaborator: Itziar de Gregorio-Monsalvo ; Adele Plunkett ; Koraljka Muzic ; Rebekka Grellmann ; Takahashi Satoko ; Antonio Hales ; Christian Lopez ; Lewis Knee
• Project Period (FY): 2016-04-01 – 2019-03-31
• Project Status: Completed (Fiscal Year 2018)
• Budget Amount: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000); Fiscal Year 2018: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2017: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000); Fiscal Year 2016: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
• Keywords: 電波天文学 / 星形成 / 連星 / 原始星 / 降着円盤 / 電波干渉計 / 原始惑星系円盤 / 質量降着

Outline of Final Research Achievements

We carried out an unbiased study with ALMA to investigate the binary properties at the early phase in Lupus molecular clouds and binary formation, a major mode of star formation in most nearby star forming regions. Surprisingly, our results indicate that the binary population in the early stages is very low and only one protobinary candidate was identified. It could be due to specific environment of this star forming region. Further, we found an intersting object that shows extended emission in continuum and the emission distribution appears to show two arms or spiral structure. We also detected molecular line emission toward this source having a velocity gradient roughly along the major axis of the continuum disk presumably suggestive of a rotating disk. Its kinematics is not simple Keplerian and infall or outflowing motion is suggested, which may explain the spiral structure.

Academic Significance and Societal Importance of the Research Achievements

私たちの太陽は現在単独星であるが、近傍の星を調べると多くの星は連星となっている。そこで、単独星と連星を決めるメカニズムを知ることは宇宙における単独星の誕生およびその周囲の惑星形成の理解につながる。生命の発生進化は多くの場合単独星で起こると考えられるので、本研究は宇宙における生命を育む惑星がどのようにできたかという理解へつながるものと考える。

Research Products

• [Int'l Joint Research] 欧州南天観測所/国際アルマ観測所/チリ大学(チリ)
• [Int'l Joint Research] カナダ国立研究機関(カナダ)
• [Int'l Joint Research] ケルン大学(ドイツ)
• [Int'l Joint Research] ディエゴポルタレス大学(ポルトガル)
• [Int'l Joint Research] ハワイ大学(米国)
• [Int'l Joint Research] 欧州南天観測所/国際アルマ観測所/チリ大学(チリ)
• [Int'l Joint Research] カナダ国立研究機関(カナダ)
• [Int'l Joint Research] ケルン大学(ドイツ)
• [Int'l Joint Research] ディエゴポルタレス大学(ポルトガル)
• [Int'l Joint Research] ハワイ大学(米国)
• [Int'l Joint Research] 欧州南天観測所/国際アルマ観測所/チリ大学(チリ)
• [Int'l Joint Research] カナダ国立研究機関(カナダ)
• [Int'l Joint Research] ケルン大学(ドイツ)
• [Int'l Joint Research] ディエゴポルタレス大学(ポルトガル)
• [Int'l Joint Research] オンサラ宇宙観測所(スウェーデン)
• [Journal Article] Possible Counterrotation between the Disk and Protostellar Envelope around the Class I Protostar IRAS 04169+2702 (2018)
  • Author(s): Takakuwa Shigehisa、Tsukamoto Yusuke、Saigo Kazuya、Saito Masao
  • Journal Title: The Astrophysical Journal Volume: 865 Issue: 1 Pages: 51-51
  • DOI: 10.3847/1538-4357/aadb93
  • Peer Reviewed
• [Journal Article] The Circumstellar Disk and Asymmetric Outflow of the EX Lup Outburst System (2018)
  • Author(s): Hales, A. S.; Perez, S.; Saito, M.; Pinte, C.; Knee, L. B. G.; de Gregorio-Monsalvo, I.; Dent, B.; Lopez, C.; Plunkett, A.; Cortes, P.; and 2 coauthors
  • Journal Title: Astrophysical Journal Volume: 859 Issue: 2 Pages: 111-111
  • DOI: 10.3847/1538-4357/aac018
  • 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] A Detached Protostellar Disk around a ~0.2 Mo Protostar in a Possible Site of a Multiple Star Formation in a Dynamical Environment in Taurus (2017)
  • Author(s): Tokuda Kazuki、Onishi Toshikazu、Saigo Kazuya、Hosokawa Takashi、Matsumoto Tomoaki、Inutsuka Shu-ichiro、Machida Masahiro N.、Tomida Kengo、Kunitomo Masanobu、Kawamura Akiko、Fukui Yasuo、Tachihara Kengo
  • Journal Title: The Astrophysical Journal Volume: 849 Issue: 2 Pages: 101-101
  • DOI: 10.3847/1538-4357/aa8e9e
  • Peer Reviewed / Open Access / 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] 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] Kinematic Structure of Molecular Gas around High-mass YSO, Papillon Nebula, in N159 East in the Large Magellanic Cloud: A New Perspective with ALMA (2017)
  • Author(s): Saigo, K., Onishi, T., Nayak, O., Meixner, M., Tokuda, K., Harada, R., Morioka, Y., Sewilo, M., Indebetouw, R., Torii, K., Kawamura, A., Ohama, A., Hattori, Y., Yamamoto, H., Tachihara, K., Minamidani, T., Inoue, T., Madden, S., Galametz, M., Lebouteiller, V., Chen, C.-H. R., Mizuno, N., and Fukui, Y.
  • Journal Title: The Astrophysical Journal Volume: 835 Issue: 1 Pages: 108-119
  • DOI: 10.3847/1538-4357/835/1/108
  • Peer Reviewed / Open Access / 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] 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] Revealing a Detailed Mass Distribution of a High-density Core MC27/L1521F in Taurus with ALMA (2016)
  • Author(s): Tokuda, K., Onishi, T., Matsumoto, T., Saigo, K., Kawamura, A., Fukui, Y., Inutsuka, S.-i., Machida, M. N., Tomida, K., Tachihara, K., and Andre, P.
  • Journal Title: The Astrophysical Journal Volume: 826 Issue: 1 Pages: 26-35
  • DOI: 10.3847/0004-637x/826/1/26
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Presentation] High Resolution ALMA Images of Young Stellar Objects in Lupus (2019)
  • Author(s): Masao Saito,
  • Organizer: American Astronomical Society 233th Meeting
  • Int'l Joint Research
• [Presentation] Misaligned Circunbinary Keplerian Disks around the Protobinary B59 BHB11 (2019)
  • Author(s): Saigo, Kazuya; Takakuwa, Shigehisa; Matsumoto, Tomoaki; Onishi, Toshikazu; Tokuda, Kazuki; Tachihara, Kengo; Saito, Masao; Kawabe, Ryohei; Sanhueza, Patricio
  • Organizer: American Astronomical Society 233th Meeting
  • Int'l Joint Research
• [Presentation] High Resolution ALMA Images of Young Stellar Objects in Lupus from the SOLA Project (2018)
  • Author(s): 齋藤 正雄
  • Organizer: 日本天文学会春季年会
• [Presentation] Multiplicity at early stages of star formation, small clusters: observations overview (2017)
  • Author(s): Masao Saito（NAOJ)
  • Organizer: Star Formation from Cores to Clusters
  • Place of Presentation: Santiago, Chile
  • Year and Date: 2017-03-06
  • Int'l Joint Research / Invited
• [Presentation] First ALMA Results on Young Binaries in Lupus from the SOLA Project (2017)
  • Author(s): 齋藤 正雄
  • Organizer: 日本天文学会秋季年会
• [Presentation] TMT (2017)
  • Author(s): 齋藤 正雄
  • Organizer: Future Exploration of Star and Planet Formation with Subaru
  • Int'l Joint Research / Invited
• [Presentation] Barnard 59 に付随する原始星連星系 BHB11 の力学構造の解明 (2017)
  • Author(s): 西合 一矢
  • Organizer: 日本天文学会秋季年会
• [Presentation] JVLA による原始星 VLA1623 の 0.1 秒角高分解能観測 (2016)
  • Author(s): 西合一矢 (大阪府立大学)
  • Organizer: 日本天文学会秋年会
  • Place of Presentation: 愛媛大学（愛媛県、松山市）
  • Year and Date: 2016-09-14
• [Remarks] Soul of Lupus with ALMA (SOLA)
  • URL: https://wikis.alma.cl/bin/view/Main/JAOSF