Using ALMA, the superb new international astronomical facility in Chile, astronomers are at the threshold of directly observing the process of planet formation, thereby stimulating intense research activity by theorists and observers worldwide. However, stubborn puzzles remain, including the "magnetic braking catastrophe" which refers to our failure to understand what stops magnetic forces from funneling all disk material directly into the nascent star. Proper tests of theories that address this puzzle will require observations of magnetic fields over a very wide range of spatial scales. The nearby rich stellar nurseries in Ophiuchus, just 125 parsecs away, provide a unique opportunity to carry out such tests. By combining polarimetry data from the Planck satellite, the HAWC+ far-IR polarimeter on SOFIA, and ALMA, we can trace magnetic fields nearly continuously over more than four orders of magnitude in spatial scale. Here we propose to observe eight protostars with HAWC+/SOFIA, out of 17 bright protostellar targets selected via ALMA total intensity mapping and proposed for ALMA polarimetry. Our results will test whether magnetic field misalignment is important for disk formation and allow field strength estimates, both of which are key unknown factors that strongly affect the formation of disks around protostars.
|Effective start/end date||4/25/18 → 4/24/20|
- Universities Space Research Association (SOFIA Grant 06-0116//NNA17BF53C)
- National Aeronautics and Space Administration (SOFIA Grant 06-0116//NNA17BF53C)
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