Using magnetic fields to probe the core-fragmentation model of binary formation

2021 年度 実施状況報告書

• 研究課題/領域番号: 18K13586
• 研究機関: 国立天文台
• 研究代表者: HULL CHARLES 国立天文台, アルマプロジェクト, 特任助教 (70814755)
• 研究期間 (年度): 2018-04-01 – 2023-03-31
• キーワード: Star Formation / Radio astronomy / Binary stars / Protostars / Polarization / Magnetic fields / Dust

研究実績の概要

The primary research goals of this program were achieved at the very beginning of FY2020 with the publication of the paper on the ALMA observations of the forming binary protostar BHR 71 (Hull et al. 2020a, ApJ, 892, 152). Our new, ongoing work focus on studying polarization and magnetic fields in a much larger sample of protostars. The main new, relevant project is an ALMA study (on which I am one of the main co-investigators) of polarization in binary/multiple protostars in the Orion star-forming region. A similar, additional ALMA survey (of which I am the PI) of all of the protostars in the Perseus star forming region was accepted for the current ALMA cycle with the highest ranking; these data should be taken within the next 6 months. The analysis of the Orion data is underway, with the first publications expected to come out in late FY2022.

現在までの達成度 (区分)

1: 当初の計画以上に進展している

理由

We have achieved the main goals of this grant, and are now continuing on with similar studies in much larger samples of sources (see the description above regarding the study of magnetic fields in a sample of binary/multiple protostars in Orion, and a future, similar, project in Perseus).

今後の研究の推進方策

The main relevant work going on in my group is on ALMA observations of magnetic fields in binary/multiple protostars. The data have been calibrated, and we have moved into the imaging phase. The plans over the next fiscal year are to perfect the image products of all of the data (both the magnetic fields via the polarized dust emission, as well as several spectral lines), and start drafting the overview/survey paper.

次年度使用額が生じた理由

The main reason why expenditure was so low in FY2021 was because of the coronavirus pandemic. Assuming the situation improves, the remaining funding in this grant will be used to support ongoing work relevant to this project -- in particular travel expenses for conferences and collaborator visits.

研究成果

• [雑誌論文] Magnetic Fields in Massive Star-forming Regions (MagMaR). I. Linear Polarized Imaging of the Ultracompact H II Region G5.89-0.39 (2021)
  • 著者名/発表者名: Fernandez-Lopez, M., Sanhueza, P., Zapata, L. A., Stephens, I., Hull, C., Zhang, Q., Girart, J. M., Koch, P. M., Cortes, P., Silva, A., Tatematsu, K., Nakamura, F., Guzman, A. E., Nguyen Luong, Q., Guzman Ccolque, E., Tang, Y.-W., Chen, H.-R. V.
  • 雑誌名: The Astrophysical Journal 巻: 913 ページ: 29
  • DOI: 10.3847/1538-4357/abf2b6
  • 査読あり / オープンアクセス / 国際共著
• [雑誌論文] Gravity-driven Magnetic Field at 1000 au Scales in High-mass Star Formation (2021)
  • 著者名/発表者名: Sanhueza, P., Girart, J. M., Padovani, M., Galli, D., Hull, C. L. H., Zhang, Q., Cortes, P., Stephens, I. W., Fernandez-Lopez, M., Jackson, J. M., Frau, P., Kock, P. M., Wu, B., Zapata, L. A., Olguin, F., Lu, X., Silva, A., Tang, Y.-W., Sakai, T., Guzman, A. E., Tatematsu, K., Nakamura, F., Chen, H.-R. V.
  • 雑誌名: The Astrophysical Journal Letters 巻: 915 ページ: 10
  • DOI: 10.3847/2041-8213/ac081c
  • 査読あり / オープンアクセス / 国際共著
• [雑誌論文] Magnetic Fields in Massive Star-forming Regions (MagMaR). II. Tomography through Dust and Molecular Line Polarization in NGC 6334I(N) (2021)
  • 著者名/発表者名: Cortes, Paulo C., Sanhueza, Patricio, Houde, Martin, Martin, Sergio, Hull, Charles L. H., Girart, Josep M., Zhang, Qizhou, Fernandez-Lopez, Manuel, Zapata, Luis A., Stephens, Ian W., Li, Hua-bai, Wu, Benjamin, Olguin, Fernando, Lu, Xing, Guzman, Andres E., Nakamura, Fumitaka
  • 雑誌名: The Astrophysical Journal 巻: 923 ページ: 204
  • DOI: 10.3847/1538-4357/ac28a1
  • 査読あり / オープンアクセス / 国際共著
• [学会発表] The Explosion in Orion-KL as Seen by Mosaicking the Magnetic Field with ALMA (2021)
  • 著者名/発表者名: Charles L. H. Hull
  • 学会等名: SOFIA B-fields and filaments meeting (contributed talk, virtual)
  • 国際学会
• [学会発表] Star formation, polarization, and magnetic fields in the ALMA era (2021)
  • 著者名/発表者名: Charles L. H. Hull
  • 学会等名: Irish National Astronomy Meeting (invited talk, virtual)
  • 国際学会 / 招待講演
• [学会発表] Star formation, polarization, and magnetic fields in the ALMA era (2021)
  • 著者名/発表者名: Charles L. H. Hull
  • 学会等名: NRAO (invited talk, virtual)
  • 招待講演
• [備考] C. Hull's personal/work website
  • URL: www.chathull.com
• [備考] C. Hull's publication list
  • URL: https://ui.adsabs.harvard.edu/public-libraries/kqeLWrvzQl-ZD7YGSqFa7A
• [備考] NAOJ main website
  • URL: https://www.nao.ac.jp/en/
• [備考] ALMA Observatory website
  • URL: https://www.almaobservatory.org/en/