高解像度円偏光観測による原始惑星系円盤の研究

• Project/Area Number: 14F04023
• Research Category: Grant-in-Aid for JSPS Fellows
• Allocation Type: Single-year Grants
• Section: 外国
• Research Field: Astronomy
• Research Institution: The University of Tokyo
• Principal Investigator: 田村 元秀 東京大学, 理学(系)研究科(研究院), 教授 (00260018)
• Co-Investigator(Kenkyū-buntansha): KWON JUNGMI 東京大学, 理学(系)研究科(研究院), 外国人特別研究員 ; KWON Jungmi 東京大学, 理学(系)研究科(研究院), 外国人特別研究員
• Project Period (FY): 2014-04-25 – 2016-03-31
• Project Status: Completed (Fiscal Year 2015)
• Budget Amount: ¥2,300,000 (Direct Cost: ¥2,300,000); Fiscal Year 2015: ¥1,100,000 (Direct Cost: ¥1,100,000); Fiscal Year 2014: ¥1,200,000 (Direct Cost: ¥1,200,000)
• Keywords: 赤外線 / 直線偏光 / 円偏光 / 星惑星形成 / 偏光

Outline of Annual Research Achievements

本研究では、すばる望遠鏡やそれ以外の望遠鏡を利用して、星・惑星形成領域における赤外円および直線偏光観測を行う。本研究の目標は以下のとおりであり、世界で初めて0.1 秒角での赤外円偏光観測を実現し、これによって、若い星の星周構造の円偏光場をマップすることで、散乱の効果および磁場の影響について、直線偏光と組み合わせて解明することである。同じデータから、円盤上層部のダストサイズ・性質の情報も得ることも期待できる。これと並行して、1秒角程度の偏光サーベイも行い、星・惑星形成領域全般における円偏光の分布を調べることを目指した。

本研究のため、すばる望遠鏡のための赤外偏光器の円偏光機能の拡充を行った。観測に必要なハードウエア・ソフトウエアについての開発を進めた。並行して、南アフリカにある赤外線望遠鏡 IRSF を用いて、星形成領域の赤外円偏光サーベイ観測を行なった。その結果、大質量星から小質量星に至るまでの星形成領域における星雲中に普遍的に赤外円偏光が検出されること、および、その偏光度や領域の広がりは、領域中で誕生している星の質量（光度）と良い相関があることを見出した。今年度は、とりわけ、その領域を拡張子、その結果を査読論文として出版した。本研究は、今後、円盤スケールでの円偏光と生命のホモキラリティーの議論を初めて行うことにつながる。本研究で取得している円偏光データは、いずれも過去にはない全く新しいデータであり、星形成、円盤およびアストロバイオロジーの研究に新展開をもたらすものと期待される。

Research Progress Status

27年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

27年度が最終年度であるため、記入しない。

Research Products

• [Journal Article] Number density distribution of near-infrared sources on a sub-degree scale in the Galactic center: Comparison with the Fe XXV Kα line at 6.7 keV (2015)
  • Author(s): Yasui, K.; Nishiyama, S.; Yoshikawa, T. et al.（12名中8番目）
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 67 Issue: 6
  • DOI: 10.1093/pasj/psv100
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Detailed structure of the outer disk around HD 169142 with polarized light in H-band (2015)
  • Author(s): Munetake Momose, Ayaka Morita, Misato Fukagawa, Takayuki Muto, Taku Takeuchi, Jun Hashimoto et al.
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 67 Issue: 5 Pages: 67-83
  • DOI: 10.1093/pasj/psv051
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Wide-field Infrared Polarimetry of the ρ Ophiuchi Cloud Core (2015)
  • Author(s): Kwon, J.; Tamura, M.; Hough, J. H. et al.（8名中2番目）
  • Journal Title: The Astrophysical Journal Supplement Series Volume: 220 Issue: 1 Pages: 17-33
  • DOI: 10.1088/0067-0049/220/1/17
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Near-IR Polarized Scattered Light Imagery of the DoAr 28 Transitional Disk (2015)
  • Author(s): Rich, Evan A.; Wisniewski, John P.; Mayama, Satoshi; et al.（55名中55番目）
  • Journal Title: The Astronomical Journal Volume: 150 Issue: 3 Pages: 86-94
  • DOI: 10.1088/0004-6256/150/3/86
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Near-IR High-resolution Imaging Polarimetry of the SU Aur Disk: Clues for Tidal Tails? (2015)
  • Author(s): de Leon, J.; Takami, M.; Karr, J. L. et al.（56名中56番目）
  • Journal Title: The Astrophysical Journal Letters Volume: 806 Issue: 1 Pages: L10-L10
  • DOI: 10.1088/2041-8205/806/1/l10
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Discovery of a Disk Gap Candidate at 20 AU in TW Hydrae (2015)
  • Author(s): E. Akiyama, T. Muto, N. Kusakabe, A. Kataoka, J. Hashimoto et al.
  • Journal Title: The Astrophysical Journal Letters Volume: 802 Issue: 2 Pages: L17-L17
  • DOI: 10.1088/2041-8205/802/2/l17
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Indications of M-dwarf deficits in the halo and thick disk of the Galaxy (2015)
  • Author(s): Konishi, Mihoko ほか57名
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 67 Issue: 1 Pages: 1-1
  • DOI: 10.1093/pasj/psu125
  • Peer Reviewed / Open Access
• [Journal Article] The outer disks of Herbig stars from the UV to NIR (2015)
  • Author(s): Grady, C. ほか59名
  • Journal Title: Astrophysics and Space Science Volume: 355 Issue: 2 Pages: 253-266
  • DOI: 10.1007/s10509-014-2214-2
  • Peer Reviewed
• [Journal Article] The Structure of Pre-transitional Protoplanetary Disks. II. Azimuthal Asymmetries, Different Radial Distributions of Large and Small Dust Grains in PDS 70 (2015)
  • Author(s): Hashimoto, J. ほか56名
  • Journal Title: The Astrophysical Journal Volume: 799 Issue: 1 Pages: 43-54
  • DOI: 10.1088/0004-637x/799/1/43
  • Peer Reviewed / Open Access
• [Journal Article] SEEDS Adaptive Optics Imaging of the Asymmetric Transition Disk Oph IRS 48 in Scattered Light (2015)
  • Author(s): Follette, Katherine B. ほか62名
  • Journal Title: The Astrophysical Journal Volume: 798 Issue: 2 Pages: 132-132
  • DOI: 10.1088/0004-637x/798/2/132
  • Peer Reviewed / Open Access
• [Journal Article] Near-IR Imaging Polarimetry toward a Bright-rimmed Cloud: Magnetic Field in SFO 74 (2015)
  • Author(s): Kusune, Takayoshi; Sugitani, Koji; Miao, Jingqi; Tamura, Motohide; Sato, Yaeko; Kwon, Jungmi; Watanabe, Makoto; Nishiyama, Shogo; Nagayama, Takahiro; Sato, Shuji
  • Journal Title: The Astrophysical Journal Volume: 798 Issue: 1 Pages: 60-75
  • DOI: 10.1088/0004-637x/798/1/60
  • Peer Reviewed / Open Access
• [Journal Article] Recovery of the Candidate Protoplanet HD 100546 b with Gemini/NICI and Detection of Additional (Planet-induced?) Disk Structure at Small Separations (2014)
  • Author(s): Currie, Thayne; Muto, Takayuki; Kudo, Tomoyuki; Honda, Mitsuhiko; Brandt, Timothy D.; Grady, Carol; Fukagawa, Misato; Burrows, Adam; Janson, Markus; Kuzuhara, Masayuki; McElwain, Michael W.; Follette, Katherine; Hashimoto, Jun; Henning, Thomas; Kandori, Ryo; Kusakabe, Nobuhiko; Kwon, Jungmi;...; Tamura, Motohide
  • Journal Title: The Astrophysical Journal Letters Volume: 796 Issue: 2 Pages: L30-L30
  • DOI: 10.1088/2041-8205/796/2/l30
  • Peer Reviewed / Open Access
• [Journal Article] Near-infrared polarimetry of the GG Tauri A binary system (2014)
  • Author(s): Itoh, Yoichi ほか49名
  • Journal Title: Research in Astronomy and Astrophysics Volume: 14 Issue: 11 Pages: 1438-1446
  • DOI: 10.1088/1674-4527/14/11/007
  • Peer Reviewed / Open Access
• [Journal Article] Near-infrared Circular Polarization Survey in Star-forming Regions: Correlations and Trends (2014)
  • Author(s): Kwon, Jungmi; Tamura, Motohide; Hough, James H.; Kusakabe, Nobuhiko; Nagata, Tetsuya; Nakajima, Yasushi; Lucas, Phil W.; Nagayama, Takahiro; Kandori, Ryo
  • Journal Title: The Astrophysical Journal Volume: 795 Issue: 1 Pages: L16-L16
  • DOI: 10.1088/2041-8205/795/1/l16
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Surface Geometry of Protoplanetary Disks Inferred From Near-Infrared Imaging Polarimetry (2014)
  • Author(s): Takami, Michihiro ほか60名
  • Journal Title: The Astrophysical Journal Volume: 795 Issue: 1 Pages: 71-91
  • DOI: 10.1088/0004-637x/795/1/71
  • Peer Reviewed / Open Access
• [Journal Article] A Statistical Analysis of SEEDS and Other High-contrast Exoplanet Surveys: Massive Planets or Low-mass Brown Dwarfs? (2014)
  • Author(s): Brandt, Timothy D.; McElwain, Michael W.; Turner, Edwin L.; Mede, Kyle; Spiegel, David S.; Kuzuhara, Masayuki; Schlieder, Joshua E.; Wisniewski, John P.; Abe, L.; Biller, B.; Brandner, W.; Carson, J.; Currie, T.; Egner, S.; Feldt, M.; Golota, T.; Goto, M.;...;Kudo, Tomoyuki; Kusakabe, Nobuhiko;...; Tamura, Motohide
  • Journal Title: The Astrophysical Journal Volume: 794 Issue: 2 Pages: 159-159
  • DOI: 10.1088/0004-637x/794/2/159
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Young Stellar Object Search toward the Boundary of the Central Molecular Zone with Near-infrared Polarimetry (2014)
  • Author(s): Yoshikawa, Tatsuhito; Nishiyama, Shogo; Tamura, Motohide; Kwon, Jungmi; Nagata, Tetsuya
  • Journal Title: The Astrophysical Journal Supplement Volume: 213 Issue: 2 Pages: 22-22
  • DOI: 10.1088/0067-0049/213/2/22
  • Peer Reviewed
• [Journal Article] The VVV Templates Project Towards an automated classification of VVV light-curves. I. Building a database of stellar variability in the near-infrared (2014)
  • Author(s): Angeloni, R ほか52名
  • Journal Title: Astronomy and Astrophysics Volume: 567 Pages: A100-A100
  • DOI: 10.1051/0004-6361/201423904
  • Peer Reviewed
• [Journal Article] The Moving Group Targets of the SEEDS High-contrast Imaging Survey of Exoplanets and Disks : Results and Observations from the First Three Years (2014)
  • Author(s): Brandt, Timothy D. ; Kuzuhara, Masayuki. ; McElwain, M. W. ; Schlieder, J. E. ; Wisniewski, J. P. ; Turner, E. L., Carson, J., Matsuo, T. ; Biller, B. ; Bonnefoy, M. ; Dressing, C. ; Janson, M. ; Knapp, G. R. ; Moro-Martin, A. ; Thalmann, C. ; Kudo, T. ; Kusakabe, N. ; Hashimoto, J. ; Abe, L. ; Brandner. W., er al.
  • Journal Title: The AstrophysicalJournal Volume: 786 Issue: 1 Pages: 1-1
  • DOI: 10.1088/0004-637x/786/1/1
  • Peer Reviewed
• [Presentation] 赤外線における星形成領域の偏光観測 (2016)
  • Author(s): Kwon, J. and SIRPOL team
  • Organizer: ALMAワークショップ
  • Place of Presentation: 国立天文台（東京都、三鷹市）
  • Year and Date: 2016-03-30
• [Presentation] Near-Infrared Linear and Circular Polarimetry in Star Forming Regions (2016)
  • Author(s): Kwon, J. and SIRPOL team
  • Organizer: 天文学教室談話会
  • Place of Presentation: 東京大学（東京都、文京区）
  • Year and Date: 2016-03-23
• [Presentation] First Infrared Circular Polarization Survey using IRSF/SIRPOL (2016)
  • Author(s): Kwon, J. and SIRPOL team
  • Organizer: IRSF Past & Future
  • Place of Presentation: SAAO (Cape Town, South Africa)
  • Year and Date: 2016-03-02
  • Int'l Joint Research
• [Presentation] Near-infrared Circular Polarization Survey in Star Forming Regions (2015)
  • Author(s): Kwon, J., Tamura, M., and SIRPOL team
  • Organizer: Annual Meeting of the Astronomical Society of Japan
  • Place of Presentation: Osaka University
  • Year and Date: 2015-03-19
• [Presentation] A Circular Polarization Survey in Star Forming Regions: Implication on Homochirality (2014)
  • Author(s): Kwon, J., Tamura, M., and SIRPOL team
  • Organizer: Origins 2014
  • Place of Presentation: Nara New Public Hall
  • Year and Date: 2014-07-07
• [Presentation] Near-Infrared Circular Polarization of Star Forming Regions: Implication on Homochirality of Life (2014)
  • Author(s): Kwon, J., Tamura, M., and SIRPOL team
  • Organizer: 新学術領域研究「Evolution of Molecules in Space」The 2nd Workshop
  • Place of Presentation: University of Tokyo
  • Year and Date: 2014-06-24
• [Presentation] Circular Polarization from Star Forming Regions (2014)
  • Author(s): Kwon, J., Tamura, M., and SIRPOL team
  • Organizer: Astronomical Polarimetry 2014
  • Place of Presentation: Grenoble, France
  • Year and Date: 2014-05-27
  • Invited
• [Remarks] Jungmi Kwon's Home Page
  • URL: http://seeds.astron.s.u-tokyo.ac.jp/~jmkwon/