2018 Fiscal Year Research-status Report
Using magnetic fields to probe the core-fragmentation model of binary formation
| Project/Area Number |
18K13586
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| Research Institution | National Astronomical Observatory of Japan |
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Principal Investigator |
HULL CHARLES 国立天文台, チリ観測所, 特任助教 (70814755)
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| Project Period (FY) |
2018-04-01 – 2020-03-31
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| Keywords | Star formation / Radio astronomy / Binary stars / Protostars / Polarization / Magnetic fields / Outflows / Dust |
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| Outline of Annual Research Achievements |
The ALMA polarization data used for this project received the highest rank possible, and were observed and delivered in June 2018. Since then, my collaborators and I have carefully analyzed the data, and have prepared an article (C. Hull: first author) that has received comments from all coauthors, and will be ready for submission to the Astrophysical Journal (ApJ) by the end of May 2019. The article will be published by the end of C. Hull's two-year KAKENHI grant. Our ALMA observations achieved our stated goal: to observe and analyze the magnetic field in a very young, forming binary star-forming system (known as BHR 71). We have gone beyond our original goals by discovering an unexpected phenomenon: specifically, that the magnetic field in one of the two sources in BHR 71 very closely follows the walls of the cavity created by the outflowing material. This discovery will have an even higher impact than anticipated because similar results were also found in other sources being analyzed by Valentin Le Gouellec, the Research Collaborator (and also Ph.D. student; note that he is not paid by this KAKENHI grant) of C. Hull, who will submit a parallel article (C. Hull, supervisor, second author) at the same time as the BHR 71 article. These observations have already led to new international collaborations, and are the motivation for recently submitted (Cycle 7) ALMA proposals to study the chemistry in these regions in order to better characterize the mechanisms responsible for the polarization we detect in our ALMA observations.
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| Current Status of Research Progress |
Current Status of Research Progress
1: Research has progressed more than it was originally planned.
Reason
The impressive efficiency of the ALMA data delivery (which is not always the case) allows a quick start to this project. The excellent support of the East Asia ALMA ARC, as well as ALMA and the NAOJ in Chile, allowed for a smooth data reduction and analysis process. Finally, the outstanding work by Valentin Le Gouellec, C. Hull's Research Collaborator (and Ph.D. student), on his parallel article (and subsequent ALMA observing proposals) led to a much more thorough development of the exciting and unexpected phenomena discovered in BHR 71.
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| Strategy for Future Research Activity |
The first goal for FY2019 is to publish the article on BHR 71 (C. Hull: first author). The article will be submitted by the end of May 2019, and thus should be published by July-August 2019. ALMA proposals have been submitted by Valentin Le Gouellec, C. Hull's graduate student, following up on intriguing chemistry aspects of BHR 71. If accepted, the data could potentially be observed in FY2019. During the paper publication process, both C. Hull and V. Le Gouellec will continue to advertise the results of this project. Notably, C. Hull was invited to present the results at the major "ALMA 2019" conference in Sardinia, Italy, and will also present the results at UT Austin in September 2019, where he will be in residence as a Tinsley Scholar for 1 week.
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| Causes of Carryover |
One of my major planned trips (to Spain) was delayed by a year due to family constraints and a large number of other trips. That trip is now planned for Oct-Nov 2019. The first week of the trip is to the ALMA 2019 conference (I am an invited speaker) in Cagliari, Sardinia, Italy. After that I will go on a three-week collaboration visit to Barcelona. I will pay for the majority of the trip expenses with my KAKENHI grant, including the conference fee to the Cagliari conference, and hotel/meal fees in both Italy and Spain. In addition to the Italy/Spain trip, I will most likely pay for both myself and my Research Collaborator V. Le Gouellec to attend the "Magnetic Fields in the Universe VII" conference in Vietnam in Feb 2020. I may also pay for my attendance to the AAS meeting in Honolulu in Jan 2020, but that is TBD. Finally, I plan to buy a new laptop. This was not in my original budget, but in the last few months one of the (very old) laptops that I use for work started to malfunction. I will order, receive, and begin using the laptop at my workplace in Chile long before the end of my KAKENHI grant, possibly as early as Oct/Nov 2019 (depending on travel plans to Japan).
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| Remarks |
C. Hull would like to thank the JSPS for the support of his and his Research Collaborator/student's research via this KAKENHI grant.
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Research Products
(15 results)
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[Journal Article] Characterizing magnetic field morphologies in three Serpens protostellar cores with ALMA2019
Author(s)
Le Gouellec, V.J.M., Hull, C.L.H., Maury, A.J., Girart, J.M., Tychoniec, L., Kristensen, L.E., Li, Z.-Y., Louvet, F., Cortes, P.C., and Rao, R.
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Journal Title
Astrophysical Journal
Volume: 885
Pages: 1-24
DOI
Peer Reviewed / Open Access / Int'l Joint Research
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