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People > Visiting Scholar > Curriculum Vita
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 (Kagoshima University)
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.

Journal Papers affiliated with ASIAA

  1. Ichikawa T; Kido M; Takaishi D; Shimajiri Y; Tsukamoto Y; Takakuwa S, "Misaligned Circumstellar Disks and Orbital Motion of the Young Binary XZ Tau" , ApJ: 919(1), id.55 (18pp), Sep, 2021 [SCI] ( ADS | Fulltext )
  2. Kitayama T; Ueda S; Akahori T; ...; Takakuwa S; et al., "Deeply cooled core of the Phoenix galaxy cluster imaged by ALMA with the Sunyaev─Zel'dovich effect" , PASJ: 72(2), id.33 (18 pp.), Apr, 2020 [SCI] ( ADS | Fulltext )
  3. Sai J; Ohashi N; Saigo K; ...; Aso Y; Takakuwa S; ...; Yen H-W; et al., "Disk Structure around the Class I Protostar L1489 IRS Revealed by ALMA: A Warped-disk System" , ApJ: 893(1), id.51 (26pp.), Apr, 2020 [SCI] ( ADS | Fulltext )
  4. Takakuwa S; Saigo K; Matsumoto T; ...; Lim J; Yen H-W; Ohashi N; Ho PTP; et al., "Circumbinary Disks of the Protostellar Binary Systems in the L1551 Region" , ApJ: 898(1), id.10 (22pp.), Jul, 2020 [SCI] ( ADS | Fulltext )
  5. Yen H-W; Zhao B; Koch P; Krasnopolsky R; Li Z-Y; Ohashi N; Shang H; Takakuwa S; Tang Y-W, "Transition from Ordered Pinched to Warped Magnetic Field on a 100 au Scale in the Class 0 Protostar B335" , ApJ: 893(1), id.54 (11pp.), Apr, 2020 [SCI] ( ADS | Fulltext )
  6. Aso Y; Hirano N; ...; Ohashi N; ...; Takakuwa S; Yen H-W; et al., "Protostellar Evolution in Serpens Main: Possible Origin of Disk-size Diversity" , ApJ: 877(2), id. 209 (14 pp.), Dec, 2019 [SCI] ( ADS | Fulltext )
  7. Kamazaki T; Nakamura F; Kawabe R; ...; Takakuwa S; Hirano N; et al., "ALMA Observations of the ρ Ophiuchus B2 Region. I. Molecular Outflows and Their Driving Sources" , ApJ: 871(1), id. 86 (20 pp.), Jan, 2019 [SCI] ( ADS | Fulltext )
  8. Matsumoto T; Saigo K; Takakuwa S, "Structure of a Protobinary System: An Asymmetric Circumbinary Disk and Spiral Arms" , ApJ: 871(1), id. 36 (17 pp.), Jan, 2019 [SCI] ( ADS | Fulltext )
  9. Sahu D; Liu S-Y; Sue Y-N; ...; Lee CF; Hirano N; Takakuwa S, "Implications of a Hot Atmosphere/Corino from ALMA Observations toward NGC 1333 IRAS 4A1" , ApJ: 872(2), id. 196 (14pp), Feb, 2019 [SCI] ( ADS | Fulltext )
  10. Su Y-N; Liu S-Y; Li Z-Y; Lee C-F; Hirano N; Takakuwa S; Hsieh I-T, "The Infall Motion in the Low-mass Protostellar Binary NGC 1333 IRAS 4A1/4A2" , ApJ: 885(2), id. 98 (16 pp.), Nov, 2019 [SCI] ( ADS | Fulltext )
  11. Yen H-W; Gu P-G; Hirano N; Koch PM; Lee C-F; Liu HB; Takakuwa S, "HL Tau Disk in HCO+ (3-2) and (1-0) with ALMA: Gas Density, Temperature, Gap, and One-arm Spiral" , ApJ: 880(2), id. 69 (18 pp.), Aug, 2019 [SCI] ( ADS | Fulltext )
  12. Yen H-W; Takakuwa S; Gu P-G; Hirano N; Lee CF; Liu HB; Liu SY; Wu CJ, "Signs of outflow feedback from a nearby young stellar object on the protostellar envelope around HL Tauri" , A&A: 623, id. A96 (20 pp.), Mar, 2019 [SCI] ( ADS | Fulltext )
  13. Yen H-W; Zhao B; Hsieh I-T; Koch P; Krasnopolsky R; Lee C-F; Li Z-Y; Liu S-Y; Ohashi N; Takakuwa S; Tang Y-W; et al., "JCMT POL-2 and ALMA Polarimetric Observations of 6000─100 au Scales in the Protostar B335: Linking Magnetic Field and Gas Kinematics in Observations and MHD Simulations" , ApJ: 871(2), id. 243 (18 pp.), Feb, 2019 [SCI] ( ADS | Fulltext )
  14. Aso Y; Hirano N; Aikawa Y; Machida MN; Takakuwa S; Yen HW; Williams JP, "The Distinct Evolutionary Nature of Two Class 0 Protostars in Serpens Main SMM4" , ApJ: 863(1), id. 19 (16 pp.), Aug, 2018 [SCI] ( ADS | Fulltext )
  15. Kawabe R; Hara C; Nakamura F; ...; Takakuwa S; ...; Hirano N; et al., "Extremely Dense Cores Associated with Chandra Sources in Ophiuchus A: Forming Brown Dwarfs Unveiled?" , ApJ: 866(2), id. 141 (15 pp.), Oct, 2018 [SCI] ( ADS | Fulltext )
  16. Koch PM; Tang Y-W; Ho PTP; Yen H-W; Su Y-N; Takakuwa S, "Polarization Properties and Magnetic Field Structures in the High-Mass Star-Forming Region W51 Observed with ALMA" , ApJ: 855(1), id. 39 (19 pp.), March, 2018 [SCI] ( ADS | Fulltext )
  17. Takakuwa S; Tsukamoto Y; Saigo K; Saito M, "Possible Counterrotation between the Disk and Protostellar Envelope around the Class I Protostar IRAS 04169+2702" , ApJ: 865(1), id. 51 (17 pp.), Sep, 2018 [SCI] ( ADS | Fulltext )
  18. Ueda S; Kitayama T; Oguri M; ...; Takakuwa S; et al., "A Cool Core Disturbed: Observational Evidence for the Coexistence of Subsonic Sloshing Gas and Stripped Shock-heated Gas around the Core of RX J1347.5─1145" , ApJ: 866(1), id. 48 (13 pp.), Oct, 2018 [SCI] ( ADS | Fulltext )
  19. Wu C-J; Hirano N; Takakuwa S; Yen H-W; Aso Y, "Physical and Chemical Conditions of the Protostellar Envelope and the Protoplanetary Disk in HL Tau" , ApJ: 869(1), id. 59 (17 pp.), Dec, 2018 [SCI] ( ADS | Fulltext )
  20. Yen H-W; Zhao B; Koch PM; Krasnopolsky R; Li Z-Y; Ohashi N; Takakuwa S, "Constraint on ion-neutral drift velocity in the Class 0 protostar B335 from ALMA observations" , A&A: 615, id.A58 (11 pp.), July, 2018 [SCI] ( ADS | Fulltext )
  21. Aso Y; Ohashi N; Aikawa Y; ...; Takakuwa S; ...; Yen HW; et al., "ALMA Observations of SMM11 Reveal an Extremely Young Protostar in Serpens Main Cluster" , ApJL: 850(1), L2, Nov 20, 2017 [SCI] ( ADS | Fulltext )
  22. Aso Y; Ohashi N; Aikawa Y;...; Takakuwa S;...; Yen HW, "ALMA Observations of the Protostar L1527 IRS: Probing Details of the Disk and the Envelope Structures" , ApJ: 849 (1), 56, Nov 1, 2017 [SCI] ( ADS | Fulltext )
  23. Takakuwa S; Saigo K; Matsumoto T; ...; Yen H-W; Ho PTP, "Spiral Arms, Infall, and Misalignment of the Circumbinary Disk from the Circumstellar Disks in the Protostellar Binary System L1551 NE" , ApJ: 837(1), 86, March, 2017 [SCI] ( ADS | Fulltext )
  24. Yen H-W; Koch PM; Takakuwa S; Krasnopolsky R; Ohashi N; et al., "Signs of Early-stage Disk Growth Revealed with ALMA" , ApJ: 834(2), 178, Jan, 2017 [SCI] ( ADS | Fulltext )
  25. Hirashita H; Koch PM; Matsushita S; Takakuwa S; Nakamura M; Asada K; Liu HB; Urata U; Wang M-J; Wang W-H; Takahashi S; Tang Y-W; Chang H-H; Huang K; Morata O; Otsuka M; Lin K-Y; Tsai A-L; Lin Y-T; Srinivasan S; Martin-Cocher P; Pu J-Y; Kemper F; Patel N; Grimes P; Huang Y-D; Han C-C; Huang Y-R; Nishioka H; Lin C-CL; Zhang Q; Keto E; Burgos R; Chen M-T; Inoue M; Ho PTP, "First-generation Science Cases for Ground-based Terahertz Telescopes" , PASJ: 68(1), R1, Feb, 2016 [SCI] ( ADS | Fulltext )
  26. Kitayama T; Ueda S; Takakuwa S; et al., "The Sunyaev-Zel'dovich effect at 5″: RX J1347.5-1145 imaged by ALMA" , PASJ: 68(5), 88, Oct, 2016 [SCI] ( ADS | Fulltext )
  27. Leung GYC; Lim J; Takakuwa S, "Tracing Infall and Rotation along the Outflow Cavity Walls of the L483 Protostellar Envelope" , ApJ: 833(1), 55, Dec, 2016 [SCI] ( ADS | Fulltext )
  28. Lim J; Yeung PKH; Hanawa T; Takakuwa S; et al., "Rotationally driven Fragmentation in the Formation of the Binary Protostellar System L1551 IRS 5" , ApJ: 826(2), 153, Aug 1, 2016 [SCI] ( ADS | Fulltext )
  29. Yen H-W; Liu HB; Gu P-G; Hirano N; Lee C-F ; Puspitaningrum E; Takakuwa S, "Gas Gaps in the Protoplanetary Disk around the Young Protostar HL Tau" , ApJL: 820(2), L25, April 1, 2016 [SCI] ( ADS | Fulltext )
  30. Yen HW; Koch PM ; Liu HB; Puspitaningrum E; Hirano N; Lee CF; Takakuwa S, "Stacking Spectra in Protoplanetary Disks: Detecting Intensity Profiles from Hidden Molecular Lines in HD163296" , ApJL: 832(2), 204, Dec, 2016 [SCI] ( ADS | Fulltext )
  31. ALMA Partnership; Brogan CL; Pérez LM; ...; Matsushita S; ...; Takahashi S; Lee C-F; ...; Takakuwa S; ...; Liu H-Y; et al., "The 2014 ALMA Long Baseline Campaign: First Results from High Angular Resolution Observations toward the HL Tau Region" , ApJL: 808(1), L3, July 20, 2015 [SCI] ( ADS | Fulltext )
  32. Aso Y; Ohashi N; Saigo K; ...; Takakuwa S; ...; Yen H-W, "ALMA Observations of the Transition from Infall Motion to Keplerian Rotation around the Late-phase Protostar TMC-1A" , ApJ: 812(1), 27, Oct, 2015 [SCI] ( ADS | Fulltext )
  33. Higuchi A; Saigo K; Chibueze J; Sanhueza P; Takakuwa S; Garay G, "IRAS 16547-4247: A New Candidate of a Protocluster Unveiled with ALMA" , ApJL: 798(2), L33, Jan, 2015 [SCI] ( ADS | Fulltext )
  34. Shimajiri Y; Sakai T; Kitamura Y; ...; Takakuwa S; et al. ,, "Spectral-Line Survey at Millimeter and Submillimeter Wavelengths toward an Outflow-Shocked Region, OMC 2-FIR 4" , ApJS: 221(2), 31, Dec, 2015 [SCI] ( ADS | Fulltext )
  35. Takakuwa S; Kiyokane K; Saigo K; Saito M, "Dispersing Envelope around the Keplerian Circumbinary Disk in L1551 NE and its Implications for the Binary Growth" , ApJ: 814, 160, Dec, 2015 [SCI] ( ADS | Fulltext )
  36. Yen H-W; Koch PM; Takakuwa S; Ho PTP; Ohashi N; Tang Y-W, "Observations of Infalling and Rotational Motions on a 1000 AU Scale around 17 Class 0 and 0/I Protostars: Hints of Disk Growth and Magnetic Braking?" , ApJ: 799(2), 193, Feb 1, 2015 [SCI] ( ADS | Fulltext )
  37. Yen H-W; Takakuwa S; Koch PM; ...; Krasnopolsky R; Ohashi N, "No Keplerian Disk >10 AU around the Protostar B335: Magnetic Braking or Young Age?" , ApJ: 812(2), 129, Oct 20, 2015 [SCI] ( ADS | Fulltext )
  38. Chitsazzadeh S; Di Francesco J; Schnee S; ...; Takakuwa S; et al., "Physical and Chemical Characteristics of L1689-SMM16, an Oscillating Prestellar Core in Ophiuchus" , ApJ: 790(2), 129, Aug 1, 2014 [SCI] ( ADS | Fulltext )
  39. Chou T-L; Takakuwa S; Yen H-W; Ohashi N; Ho PTP, "Transition from the Infalling Envelope to the Keplerian Disk around L1551 IRS 5" , ApJ: 796(1), 70, Nov 20, 2014 [SCI] ( ADS | Fulltext )
  40. Koyamatsu S; Takakuwa S; Hayashi M; Mayama S; Ohashi N, "The Disappearing Envelope around the Transitional Class I Object L43" , ApJ: 789(2), 95, July, 2014 [SCI] ( ADS | Fulltext )
  41. Ohashi N; Saigo K; Aso Y; ...; Takakuwa S; ...; Yen H-W ., "Formation of a Keplerian Disk in the Infalling Envelope around L1527 IRS: Transformation from Infalling Motions to Kepler Motions" , ApJ: 796(2), 131, Dec 1, 2014 [SCI] ( ADS | Fulltext )
  42. Sakai N; Oya Y; Sakai T; ...; Takakuwa S; Ohashi N; Yen H-W; et al., "A Chemical View of Protostellar-Disk Formation in L1527" , ApJL: 791(2), L38, Aug 20, 2014 [SCI] ( ADS | Fulltext )
  43. 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, March 6, 2014 [SCI] ( ADS | Fulltext )
  44. Takakuwa S; Saito M; Saigo K; Matsumoto T; Lim J; Hanawa T; Ho PTP, "Angular Momentum Exchange by Gravitational Torques and Infall in the Circumbinary Disk of the Protostellar System L1551 NE" , ApJ: 796(1), 1, Nov, 2014 [SCI] ( ADS | Fulltext )
  45. Wirstrom ES; Charnley SB; Persson CM; Buckle JV; Cordiner MA; Takakuwa S, "Cold Water Vapor in the Barnard 5 Molecular Cloud" , ApJL: 788(2), L32, June, 2014 [SCI] ( ADS | Fulltext )
  46. Yen H-W; Takakuwa S; Ohashi N; et al., "ALMA Observations of Infalling Flows toward the Keplerian Disk around the Class I Protostar L1489 IRS" , ApJ: 793(1), 1, Sept 20, 2014 [SCI] ( ADS | Fulltext )
  47. Takakuwa S; Saito M; Lim J; Saigo K, "Evidence for Infalling Gas of Low Angular Momentum toward the L1551 NE Keplerian Circumbinary Disk" , ApJ: 776(1), 51, Oct, 2013 [SCI] ( ADS | Fulltext )
  48. Yen H-W; Takakuwa S; Ohashi N; Ho PTP, "Unveiling the Evolutionary Sequence from Infalling Envelopes to Keplerian Disks around Low-Mass Protostars" , ApJ: 772(1), 22, July, 2013 [SCI] ( ADS | Fulltext )
  49. Nakamura F; Takakuwa S; Kawabe R, "Substellar-mass Condensations in Prestellar Cores" , ApJL: 758(2), L25, Oct 20, 2012 [SCI] ( ADS | Fulltext )
  50. Takakuwa S; Saito M; Lim J; Saigo K; Sridharan TK; Patel NA, "A Keplerian Circumbinary Disk around the Protostellar System L1551 NE" , ApJ: 754(1), 52, July 20, 2012 [SCI] ( ADS | Fulltext )
  51. Yamada K; Kitayama T; Takakuwa S; et al., "Imaging Simulations of the Sunyaev-Zel'dovich Effect for ALMA" , PASJ: 64(5), 102, Oct 25, 2012 [SCI] ( ADS | Fulltext )
  52. Yamaguchi T; ...; Liu S-Y; Su Y-N; Hirano N; Takakuwa S; et al., "The 3 mm Spectral Line Survey toward the Lynds 1157 B1 Shocked Region. I. Data" , PASJ: 64(5), 105, Oct 25, 2012 [SCI] ( ADS | Fulltext )
  53. Jorgensen JK; Bourke TL; ...; 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" , A&A: 534, A100, Oct, 2011 [SCI] ( ADS | Fulltext )
  54. Shimajiri Y; Kawabe R; Takakuwa S; et al., "New Panoramic View of 12CO and 1.1mm Continuum Emission in the Orion A Giant Molecular Cloud. I. Survey Overview and Possible External Triggers of Star Formation" , PASJ: 63(1), 105-123, Feb 25, 2011 [SCI] ( ADS | Fulltext )
  55. Sugimura M; ...; Hirano N; Liu S-Y; ...; Su Y-N; Takakuwa S; et al., "Early Results of the 3mm Spectral Line Survey toward the Lynds 1157 B1 Shocked Region" , PASJ: 63(2), 459-472, Apr 25, 2011 [SCI] ( ADS | Fulltext )
  56. Takakuwa S; Kamazaki T, "Skewed Distributions and Opposite Velocity Gradients of Submillimeter Molecular Lines in Low-Mass Protostellar Envelopes" , PASJ: 63(4), 921-939, Aug, 2011 [SCI] ( ADS | Fulltext )
  57. Takakuwa S; Ohashi N; Aikawa Y, "Carbon-chain and Organic Molecules Around Very Low Luminosity Protostellar Objects of L1521F-IRS and IRAM 04191+1522" , ApJ: 728(2), 101, Feb, 2011 [SCI] ( ADS | Fulltext )
  58. Yamaguchi T; ...; Liu SY; Su Y-N; Hirano N; Takakuwa S; et al., "Detection of Phosphorus Nitride in the Lynds 1157 B1 Shocked Region" , PASJ: 63(5), L37-L41, Oct 25, 2011 [SCI] ( ADS | Fulltext )
  59. Yen H-W; Takakuwa S; Ohashi N, "Kinematics and Physical Conditions of the Innermost Envelope in B335" , ApJ: 742(1), 57, Nov 20, 2011 [SCI] ( ADS | Fulltext )
  60. Friesen RK; Di Francesco J; Shimajiri Y; Takakuwa S, "The Initial Conditions of Clustered Star Formation. II. N2H+ Observations of the Ophiuchus B Core" , ApJ: 708(2), 1002-1024, Jan 10, 2010 [SCI] ( ADS | Fulltext )
  61. Hiramatsu M; Hirano N; Takakuwa S, "Outflow - Core Interaction in Barnard 1" , ApJ: 712(2), 778-789, April 1, 2010 [SCI] ( ADS | Fulltext )
  62. Yen H-W; Takakuwa S; Ohashi N, "High-Velocity Jets and Slowly Rotating Envelope in B335" , ApJ: 710(2), 1786-1799, Feb 20, 2010 [SCI] ( ADS | Fulltext )
  63. Iguchi S; Morita KI; Sugimoto M; ...; Takakuwa S; et al., "The Atacama Compact Array (ACA)" , PASJ: 61(1), 1-12, February 25, 2009 [SCI] ( ADS | Fulltext )
  64. 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" , PASJ: 61(5), 1055-1063, October 25, 2009 [SCI] ( ADS | Fulltext )
  65. Wu P-F; Takakuwa S; Lim J, "Multiple Bipolar Molecular Outflows from the L1551 IRS5 Protostellar System" , ApJ: 698(1), 184–197, June 10, 2009 [SCI] ( ADS | Fulltext )
  66. 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" , ApJ: 683(1), 255-266, Aug 10, 2008 [SCI] ( ADS | Fulltext )
  67. 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" , ApJ: 688(1), 344-361, Nov 20, 2008 [SCI] ( ADS | Fulltext )
  68. 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" , Ap&SS: 313(1-3), 165-168, Jan, 2008 [SCI] ( ADS | Fulltext )
  69. Takakuwa S; Iono D; Vila-Vilaro B; Sekiguchi T; et al., "Scientific role of ACA for low-mass star-formation study" , Ap&SS: 313(1-3), 169-173, Jan, 2008 [SCI] ( ADS | Fulltext )
  70. 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" , ApJ: 675(1), 454-463, Mar 1, 2008 [SCI] ( ADS | Fulltext )
  71. 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" , ApJ: 584(2), 818-831, Feb 20, 2003 [SCI] ( ADS | Fulltext )
  72. Takakuwa S; Ohashi N; Hirano N, "Interaction between the Outflow and the Core in IRAM 04191+1522" , ApJ: Journal 590(2), 932-943, Jun 20, 2003 [SCI] ( ADS | Fulltext )
  73. Ikeda M; Kawaguchi K; Takakuwa S; et al, "Multi-transitional observations of methanol in Comet Hale-Bopp (1995 O1)" , A&A: 390(1), 363-367, Jul, 2002 [SCI] ( ADS | Fulltext )
  74. Aikawa Y; Ohashi N; Inutsuka S-i; ...; Takakuwa S, "Molecular evolution in collapsing prestellar cores" , ApJ: 552(2), 639-653, May 10, 2001 [SCI] ( ADS | Fulltext )
  75. Takakuwa S; Kawaguchi K; Mikami H; Saito M, "The ortho-to-para ratio and the chemical properties of C3H2 in dark cloud cores" , PASJ: 53(2), 251-257, 2001 [SCI] ( ADS | Fulltext )
  76. Takakuwa S; Mikami H; Saito M; Hirano N, "A Comparison of the Spatial Distribution of H13CO+, CH3OH, and C34S Emission and Its Implication in Heiles Cloud 2" , ApJ: 542(1), 367-379, Oct 10, 2000 [SCI] ( ADS | Fulltext )
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