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ALMA Observation of Gas Spirals as a Nursery of Binary Stars
Dust distribution in the binary protostellar system L1551 NE observed with the SMA in 0.9 mm continuum.
The 7 mm Continuum Image of the Binary Protostellar System L1551 IRS 5
Carbon-chain and Organic Molecules around Very Low Luminosity Protostellar Objects of L1521F-IRS and IRAM 04191+1522
Rotating Gas Motion around Protostars
A Keplerian Circumbinary Disk around the Protostellar System L1551 NE
Takakuwa, Shigehisa
Visiting Scholar
photo of Takakuwa, Shigehisa
Email: takakuwa_replace2@_asiaa.sinica.edu.tw

Education and Positions

  • Professor, Kagoshima University, Japan (2016~present)
  • Associate Research Fellow, ASIAA (2011~2016)
  • Assistant Research Fellow, ASIAA (2007~2011)
  • Postdoctoral Fellow, National Astronomical Observatory of Japan – ALMA Project Office (2005~2007)
  • Postdoctoral Fellow, Harvard-Smithsonian Center for Astrophysics – Submillimeter Array Project (2002~2005)
  • Postdoctoral Fellow, ASIAA (1999~2002)
  • B.S., Astronomy, University of Tokyo (1990~1994)
  • Ph.D., Astronomy, University of Tokyo (1999)
  • M.S., Astronomy, University of Tokyo (1996)

Research Interests

My major research is to study how solar-type stars form in the clouds of molecular gas and dust in the interstellar space. I have two specific strategies to study star formation. One is observing emission from various molecules at millimeter wavelengths in star-forming clouds and studying chemistry of the clouds, because the chemical evolution of the clouds can be linked to the physical evolution into the star formation. The other strategy is single-dish and interferometric observations of molecular emission at submillimeter wavelengths, with the forefront submillimeter telescopes such as SMA, ASTE, and ALMA. Submillimeter molecular lines trace warmer molecular gas, allowing us to study the close vicinity of the forming star.

Recent Journal Papers

  1. Yen HW; Koch PM ; Liu HY B; Puspitaningrum E; Hirano N; Lee CF; Takakuwa S, "Stacking Spectra in Protoplanetary Disks: Detecting Intensity Profiles from Hidden Molecular Lines in HD163296" , Astrophysical Journal Letters: 832(2), 204, 2016-12 [SCI] (Fulltext)
  2. H. Hirashita, P. M. Koch, S. Matsushita, S. Takakuwa, M. Nakamura, K. Asada, H. B. Liu, Y. Urata, M.-J. Wang, W.-H. Wang, S. Takahashi, Y.-W. Tang, H.-H. Chang, K. Huang, O. Morata, M. Otsuka, K.-Y. Lin, A.-L. Tsai, Y.-T. Lin, S. Srinivasan, P. Martin-Cocher, H.-Y. Pu, F. Kemper, N. Patel, P. Grimes, Y.-D. Huang, C.-C. Han, Y.-R. Huang, H. Nishioka, L. C.-C. Lin, Q. Zhang, E. Keto, R. Burgos, M.-T. Chen, M. Inoue, & P. T. P. Ho, "First-generation Science Cases for Ground-based Terahertz Telescopes" , PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN: 68(1), R1, 2016-02 [SCI] (Fulltext)
  3. Shigehisa Takakuwa, Kazuhiro Kiyokane, Kazuya Saigo, & Masao Saito, "Dispersing Envelope around the Keplerian Circumbinary Disk in L1551 NE and its Implications for the Binary Growth" , ASTROPHYSICAL JOURNAL: 814, 160 (18pp), 2015-12 [SCI]
  4. Yoshito Shimajiri, Takeshi Sakai, Yoshimi Kitamura, Takashi Tsukagoshi, Masao Saito, Fumitaka Nakamura, Munetake Momose, Shigehisa Takakuwa, Takahiro Yamaguchi, Nami Sakai, Satoshi Yamamoto, & Ryohei Kawabe, "Spectral-Line Survey at Millimeter and Submillimeter Wavelengths toward an Outflow-Shocked Region, OMC 2-FIR 4" , ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES: 221, 31 (31pp), 2015-12 [SCI]
  5. Yusuke Aso, Nagayoshi Ohashi, Kazuya Saigo, Shin Koyamatsu, Yuri Aikawa, Masahiko Hayashi, Masahiro N. Machida, Masao Saito, Shigehisa Takakuwa, Kengo Tomida, Kohji Tomisaka, & Hsi-Wei Yen, "ALMA Observations of the Transition from Infall Motion to Keplerian Rotation around the Late-phase Protostar TMC-1A" , ASTROPHYSICAL JOURNAL: 812, 27 (20pp), 2015-10 [SCI]
  6. Hsi-Wei Yen, Shigehisa Takakuwa, Patrick M. Koch, Yusuke Aso, Shin Koyamatsu, Ruben Krasnopolsky, & Nagayoshi Ohashi, "No Keplerian Disk >10 AU around the Protostar B335: Magnetic Braking or Young Age?" , ASTROPHYSICAL JOURNAL: 812, 129 (22pp), 2015-10 [SCI] (Fulltext)
  7. ALMA Partnership, C. L. Brogan, L. M. Pérez, T. R. Hunter, W. R. F. Dent, A. S. Hales, R. E. Hills, S. Corder, E. B. Fomalont, C. Vlahakis, Y. Asaki, D. Barkats, A. Hirota, J. A. Hodge, C. M. V. Impellizzeri, R. Kneissl, E. Liuzzo, R. Lucas, N. Marcelino, S. Matsushita, K. Nakanishi, N. Phillips, A. M. S. Richards, I. Toledo, R. Aladro, D. Broguiere, J. R. Cortes, P. C. Cortes, D. Espada, F. Galarza, D. Garcia- Appadoo, L. Guzman- Ramirez, E. M. Humphreys, T. Jung, S. Kameno, R. A. Laing, S. Leon, G. Marconi, A. Mignano, B. Nikolic, L.-A. Nyman, M. Radiszcz, A. Remijan, J. A. Rodón, T. Sawada, S. Takahashi, R. P. J. Tilanus, B. Vila Vilaro, L. C. Watson, T. Wiklind, E. Akiyama, E. Chapillon, I. de Gregorio- Monsalvo, J. Di Francesco, F. Gueth, A. Kawamura, C.-F. Lee, Q. Nguyen Luong, J. Mangum, V. Pietu, P. Sanhueza, K. Saigo, S. Takakuwa, C. Ubach, T. van Kempen, A. Wootten, A. Castro- Carrizo, H. Francke, J. Gallardo, J. Garcia, S. Gonzalez, T. Hill, T. Kaminski, Y. Kurono, H.-Y. Liu, C. Lopez, F. Morales, K. Plarre, G. Schieven, L. Testi, L. Videla, E. Villard, P. Andreani, J. E. Hibbard, & K. Tatematsu, "The 2014 ALMA Long Baseline Campaign: First Results from High Angular Resolution Observations toward the HL Tau Region" , Astrophysical Journal Letters: 808, L3 (10pp), 2015-07 [SCI]
  8. Hsi-Wei Yen, Patrick M. Koch, Takakuwa Shigehisa, Paul T. P. Ho, Nagayoshi Ohashi, & Ya-Wen Tang, "Observations of Infalling and Rotational Motions on a 1,000-AU Scale around 17 Class 0 and 0/I Protostars: Hints of Disk Growth and Magnetic Braking ?" , ASTROPHYSICAL JOURNAL: 799, 193 (26pp), 2015-02 [SCI]
  9. Aya Higuchi, Kazuya Saigo, James Chibueze, Patricio Sanhueza, Shigehisa Takakuwa, and Guido Garay, "IRAS 16547-4247: A New Candidate of a Protocluster Unveiled with ALMA" , Astrophysical Journal Letters: 798, L33 (6pp), 2015-01 [SCI]
  10. Nagayoshi Ohashi, Kazuya Saigo, Yusuke Aso, Yuri Aikawa, Shin Koyamatsu, Masahiro N. Machida, Masao Saito, Sanemichi Z. Takahashi, Shigehisa Takakuwa, Kengo Tomida, Kohji Tomisaka, & Hsi-Wei Yen, "Formation of a Keplerian Disk in the Infalling Envelope around L1527 IRS: Transformation from Infalling Motions to Kepler Motions" , ASTROPHYSICAL JOURNAL: 796, 131 (11pp), 2014-12 [SCI]
  11. Shigehisa Takakuwa, Masao Saito, Kazuya Saigo, Tomoaki Matsumoto, Jeremy Lim, Tomoyuki Hanawa, & Paul T. P. Ho, "Angular Momentum Exchange by Gravitational Torques and Infall in the Circumbinary Disk of the Protostellar System L1551 NE" , ASTROPHYSICAL JOURNAL: 796, 1 (17pp), 2014-11 [SCI]
  12. Ti-Lin Chou, Shigehisa Takakuwa, Hsi-Wei Yen, Nagayoshi Ohashi, & Paul T. P. Ho, "Transition from the Infalling Envelope to the Keplerian Disk around L1551 IRS 5" , ASTROPHYSICAL JOURNAL: 796, 70 (15pp), 2014-11 [SCI]
  13. Hsi-Wei Yen, Shigehisa Takakuwa, Nagayoshi Ohashi, Yuri Aikawa, Yusuke Aso, Shin Koyamatsu, Masahiro N. Machida, Kazuya Saigo, Masao Saito, Kengo Tomida, & Kohji Tomisaka, "ALMA Observations of Infalling Flows Toward the Keplerian Disk Around the Class I Protostar L1489 IRS" , ASTROPHYSICAL JOURNAL: 793, 1 (20pp), 2014-09 [SCI]
  14. Nami Sakai, Yoko Oya, Takeshi Sakai, Yoshimasa Watanabe, Tomoya Hirota, Cecilia Ceccarelli, Claudine Kahane, Ana Lopez-Sepulcre, Bertrand Lefloch, Charlotte Vastel, Sandrine Bottinelli, Emmanuel Caux, Audrey Coutens, Yuri Aikawa, Shigehisa Takakuwa, Nagayoshi Ohashi, Hsi-Wei Yen, & Satoshi Yamamoto, "A Chemical View of Protostellar-Disk Formation in L1527" , Astrophysical Journal Letters: 791, L38 (5pp), 2014-08 [SCI]
  15. S. Chitsazzadeh, J. Di Francesco, S. Schnee, R. K. Friesen, Y. Shimajiri, G. I. Langston, S. I. Sadavoy, T. L. Bourke, E. R. Keto, J. E. Pineda, S. Takakuwa, K. Tatematsu, "Physical and Chemical Characteristics of L1689-SMM16, an Oscillating Prestellar Core in Ophiuchus" , ASTROPHYSICAL JOURNAL: 790, 129 (21pp), 2014-08 [SCI]
  16. Shin Koyamatsu, Shigehisa Takakuwa, Masahiko Hayashi, Satoshi Mayama, & Nagayoshi Ohashi, "The Disappearing Envelope around the Transitional Class I Object L43" , ASTROPHYSICAL JOURNAL: 789, 95 (13pp), 2014-07 [SCI]
  17. E. S. Wirstrom, S. B. Charnley, C. M. Persson, J. V. Buckle, M. A. Cordiner, & S. Takakuwa, "Cold Water Vapor in the Barnard 5 Molecular Cloud" , Astrophysical Journal Letters: 788, L32 (5pp), 2014-06 [SCI]
  18. Sakai N; Sakai T; Hirota T; ...; Ohashi N; Takakuwa S; Yen H-W; et al., "Change in the chemical composition of infalling gas forming a disk around a protostar" , NATURE: 507(7490), 78-80, 2014-03 [SCI] (Fulltext)
  19. Shigehisa Takakuwa, Masao Saito, Jeremy Lim & Kazuya Saigo, "Evidence for Infalling Gas of Low Angular Momentum towards the L1551 NE Keplerian Circumbinary Disk" , ASTROPHYSICAL JOURNAL: 776, 51 (11pp), 2013-10 [SCI]
  20. Hsi-Wei Yen, Shigehisa Takakuwa, Nagayoshi Ohashi, & Paul, T. P. Ho, "Unveiling the Evolutionary Sequence from Infalling Envelopes to Keplerian Disks around Low-Mass Protostars" , ASTROPHYSICAL JOURNAL: 772, 22 (25pp), 2013-07 [SCI]
  21. Kenkichi Yamada, Tetsu Kitayama, Shigehisa Takakuwa, Daisuke Iono, Takahiro Tsutsumi, Kotaro Kohno, Motokazu Takizawa, Kohji Yoshikawa, Takuya Akahori, Eiichiro Komatsu, Yasushi Suto, Hiroshi Matsuo, & Ryohei Kawabe, "Imaging Simulations of the Sunyaev-Zel'dovich Effect for ALMA" , PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN: 64, 102 (16pp), 2012-10 [SCI]
  22. Takahiro Yamaguchi, Shuro Takano, Yoshimasa Watanabe, Nami Sakai, Takeshi Sakai, Sheng-Yuan Liu, Yu-Nung Su, Naomi Hirano, Shigehisa Takakuwa, Yuri Aikawa, Hideko Nomura, & Satoshi Yamamoto, "The 3 mm Spectral Line Survey toward the Lynds 1157 B1 Shocked Region. I. Data" , PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN: 64(5), 105 (45pp), 2012-10 [SCI]
  23. Fumitaka Nakamura, Shigehisa Takakuwa, & Ryohei Kawabe, "Substellar-mass Condensations in Prestellar Cores" , Astrophysical Journal Letters: 758, L25 (5pp), 2012-09 [SCI]
  24. Shigehisa Takakuwa, Masao Saito, Lim Jeremy, Kazuya Saigo, T. K. Sridharan, & Nimesh A. Patel, "A Keplerian Circumbinary Disk around the Protostellar System L1551 NE" , ASTROPHYSICAL JOURNAL: 754, 52 (12pp), 2012-07 [SCI] (Fulltext)
  25. Yen H-W; Takakuwa S; Ohashi N, "Kinematics and Physical Conditions of the Innermost Envelope in B335" , ASTROPHYSICAL JOURNAL: 742(1), 57 (17pp), 2011-11 [SCI]
  26. Jorgensen JK; Bourke TL; Nguyen Luong Q; Takakuwa S, "Arcsecond resolution images of the chemical structure of the low-mass protostar IRAS 16293-2422; An overview of a large molecular line survey from the Submillimeter Array" , ASTRONOMY & ASTROPHYSICS: 534, A100 (28pp), 2011-10 [SCI]
  27. Yamaguchi T; ...; Liu SY; Su Y-N; Hirano N; Takakuwa S; et al. , "Detection of Phosphorus Nitride in the Lynds 1157 B1 Shocked Region" , PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN: 63(5), L37-L41, 2011-10 [SCI]
  28. Shigehisa Takakuwa & Takeshi Kamazaki, "Skewed Distributions and Opposite Velocity Gradients of Submillimeter Molecular Lines in Low-Mass Protostellar Envelopes" , PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN: 63(4), 921-939, 2011-08 [SCI] (Fulltext)
  29. Sugimura M; ...; Hirano N; Liu S-Y; ...; Su Y-N; Takakuwa S; et al., "Early Results of the 3 mm Spectral Line Survey toward the L1157 B1 Shocked Region" , PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN: 63(2), 459-472, 2011-04 [SCI] (Fulltext)
  30. Shigehisa Takakuwa, Nagayoshi Ohashi, & Yuri Aikawa, "Carbon-chain and Organic Molecules Around Very Low Luminosity Protostellar Objects of L1521F-IRS and IRAM 04191+1522" , ASTROPHYSICAL JOURNAL: 728(2), 101 (10pp), 2011-02 [SCI]
  31. Yoshito Shimajiri, Ryohei Kawabe, Shigehisa Takakuwa, Masao Saito, Takashi Tsukagoshi, Munetake Momose, Norio Ikeda, E. Akiyama, Austermann, J. E., H. Ezawa, K. Fukue, M. Hiramatsu, D. Hughes, Y. Kitamura, K. Kohno, Y. Kurono, Scott, K. S., G. Wilson, A. Yoshida, & M. S. Yun, "New Panoramic View of $^{12}$CO and 1.1 mm Continuum Emission in the Orion A Molecular Cloud. I. Survey Overview and Possible External Triggers of Star Formation" , PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN: 63(1), 105--123, 2011-02 [SCI] (Fulltext)
  32. Hiramatsu M; Hirano N; Takakuwa S, "Outflow - Core Interaction in Barnard 1" , ASTROPHYSICAL JOURNAL: 712(2), 778-789, 2010-04 [SCI] (Fulltext)
  33. Yen H-W; Takakuwa S; Ohashi N, "High-Velocity Jets and Slowly Rotating Envelope in B335" , ASTROPHYSICAL JOURNAL: 710(2), 1786-1799, 2010-02 [SCI] (Fulltext)
  34. Friesen RK; Di Francesco J; Shimajiri Y; Takakuwa S, "The Initial Conditions of Clustered Star Formation. II. N2H+ Observations of the Ophiuchus B Core" , ASTROPHYSICAL JOURNAL: 708(2), 1002-1024, 2010-01 [SCI] (Fulltext)
  35. Shimajiri Y; Takahashi S; Takakuwa S; et al., "Millimeter- and Submillimeter-Wave Observations of the OMC-2/3 region. IV; Interaction between the Outflow and the Dense Gas in the Cluster Forming Region of OMC-2 FIR 6" , PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN: 61(5), 1055-1063, 2009-10 [SCI] (Fulltext)
  36. Wu P-F; Takakuwa S; Lim J, "Multiple Bipolar Molecular Outflows from the L1551 IRS5 Protostellar System" , ASTROPHYSICAL JOURNAL: 698(1), 184–197, 2009-06 [SCI] (Fulltext)
  37. Iguchi S; Morita KI; Sugimoto M; ...; Takakuwa S; et al., "The Atacama Compact Array (ACA)" , PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN: 61(1), 1-12, 2009-02 [SCI] (Fulltext)
  38. Takahashi S; Saito M; Ohashi N; ...; Takakuwa S; et al., "Millimeter- and Submillimeter- Wave Observations of the OMC-2/3 Region. III. An Extensive Survey for Molecular Outflows" , ASTROPHYSICAL JOURNAL: 688(1), 344-361, 2008-11 [SCI] (Fulltext)
  39. Shimajiri Y; Takahashi S; Takakuwa S; et al., "Millimeter- and Submillimeter- Wave Observations of the OMC-2/3 Region. II. Observational Evidence for Outflow Triggered Star Formation in the OMC-2 FIR3/4 Region" , ASTROPHYSICAL JOURNAL: 683(1), 255-266, 2008-08 [SCI] (Fulltext)
  40. Yeh SCC; Hirano N; ...; Ho PTP; Lee CF; Ohashi N; Takakuwa S, "The CO Molecular Outflows of IRAS 16293-2422 Probed by the Submillimeter Array" , ASTROPHYSICAL JOURNAL: 675(1), 454-463, 2008-03 [SCI] (Fulltext)
  41. Takahashi S; Saito M; Takakuwa S; Kawabe R, "A new evolutionary scenario of intermediate-mass star-formation revealed by multi-wavelength observations of OMC-2/3" , ASTROPHYSICS AND SPACE SCIENCE: 313(1-3), 165-168, 2008-01 [SCI] (Fulltext)
  42. Takakuwa S; Iono D; Vila-Vilaro B; Sekiguchi T; et al., "Scientific role of ACA for low-mass star-formation study" , ASTROPHYSICS AND SPACE SCIENCE: 313(1-3), 169-173, 2008-01 [SCI] (Fulltext)
  43. Takakuwa S, "Frontier of Submillimeter Astronomy - SMA, ASTE, and ALMA Observations of Protostellar Envelopes in Submillimeter Molecular Lines" , ASTRONOMICAL HERALD: 100(7), 330 - 339, 2007-07 (Fulltext)
  44. Takakuwa S; Ohashi N; Hirano N, "Interaction between the Outflow and the Core in IRAM 04191+1522" , ASTROPHYSICAL JOURNAL: Journal 590(2), 932-943, 2003-06 [SCI] (Fulltext)
  45. Takakuwa S; Kamazaki T; Saito M; Hirano N, "H13CO+ and CH3OH Line Observations of Prestellar Dense Cores in the TMC-1C Region. II. Internal Structure" , ASTROPHYSICAL JOURNAL: 584(2), 818-831, 2003-02 [SCI] (Fulltext)
  46. Ikeda M; Kawaguchi K; Takakuwa S; et al, "Multi-transitional observations of methanol in Comet Hale-Bopp (1995 O1)" , ASTRONOMY AND ASTROPHYSICS: 390(1), 363-367, 2002-07 [SCI] (Fulltext)
  47. Aikawa Y; Ohashi N; ...; Takakuwa S, "Molecular evolution in collapsing prestellar cores" , ASTROPHYSICAL JOURNAL: 552(2), 639-653, 2001-05 [SCI] (Fulltext)
  48. Takakuwa S; Kawaguchi K; Mikami H; Saito M, "The ortho-to-para ratio and the chemical properties of C3H2 in dark cloud cores" , PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN: 53(2), 251-257, 2001 [SCI] (Fulltext)
  49. Takakuwa S; Mikami H; Saito M; Hirano N, "A comparison of the spatial distribution of (HCO+)-C-13, CH3OH, and (CS)-S-34 emission and its implication in Heiles cloud 2" , ASTROPHYSICAL JOURNAL: 542(1), 367-379, 2000-10 [SCI] (Fulltext)
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