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My research as an NAOJ Fellow of the National Astronomical Observatory of Japan's Chile Observatory, based at the Joint ALMA Observatory in Santiago de Chile, currently focuses on star formation, dust polarization, and polarization calibration with ALMA.

Prior to moving to Chile (with a brief stopover at NAOJ HQ in Tokyo), I worked for three years as a Jansky Fellow of the National Radio Astronomy Observatory, based at the Harvard-Smithsonian Center for Astrophysics. There I published some of the first ALMA observations of magnetic fields toward extremely young, "Class 0" star-forming cores, investigating the role of turbulence at the smallest scales of magnetized star formation (click here), and finding that the a protostar's bipolar outflow can shape the source's ambient magnetic field (click here).

Before moving back to the East Coast, I was a graduate student at the University of California, Berkeley, where I was the principal investigator (PI) of the TADPOL collaboration, which comprised 25 astronomers from twelve institutions across the U.S. and Canada. The main goal of the TADPOL survey was to map the magnetic fields in the densest regions of cold, dusty star-forming clouds. We used the 1 mm, dual-polarization receiver system at CARMA, a millimeter-wave radio telescope near Bishop, CA.

The results from the TADPOL survey (click here), published in 2014, show that the magnetic fields in a subset of the low-mass protostellar cores we observed may have been wrapped up by core rotation, and that overall, outflows and small-scale magnetic fields these objects are randomly aligned. These results are consistent with the first results from the TADPOL survey, which discussed the misalignment of magnetic fields and outflows (click here).

Along with Dick Plambeck, a research astronomer at UC Berkeley, I tested, installed, and calibrated the CARMA dual-polarization receiver system; click here for the publication that describes the receiver system in detail.

My research career began in the summer of 2005, when I worked as an NSF REU intern with astronomy professor Dan Watson at the University of Rochester, analyzing a sample of Class 0 protostars observed by the Spitzer Space Telescope. Our work was published in a Nature article (click here) that discussed the observational signatures of an accretion shock caused by material falling from the protostellar envelope onto the deeply embedded protostellar disk of the protostar NGC 1333-IRAS 4B.

Selected Publications
(see the full list on my CV or on ADS)

Hull, C. L. H., et al., “ALMA observations of dust polarization and molecular line emission from the Class 0 protostellar source Serpens SMM1,” 2017, ApJ, 847, 92

Hull, C. L. H., et al., “Unveiling the Role of the Magnetic Field at the Smallest Scales of Star Formation,” 2017, ApJL, 842, 9

Lee, J. W. Y., Hull, C. L. H., and Offner, S. R., “Synthetic Observations of Magnetic Fields in Protostellar Cores,” 2017, ApJ, 834, 201

Hull, C. L. H., Girart, J. M., and Zhang, Q., “880 µm SMA polarization observations of the quasar 3C 286,” 2016, ApJ, 830, 124

Hull, C. L. H., et al., “An extremely high velocity molecular jet surrounded by an ionized cavity in the protostellar source Serpens SMM1,” 2016, ApJL, 823, 27

Hull, C. L. H. and Plambeck, R. L., “The 1.3mm Full-Stokes Polarization System at CARMA,” 2015, JAI, 4, 1550005

Hull, C. L. H., “From Cores to Envelopes to Disks: A Multi-scale View of Magnetized Star Formation,” 2014, Ph.D. Thesis, University of California, Berkeley [PDF] [ADS] [ProQuest]

Hull, C. L. H., Plambeck, R. L. et al., “TADPOL: A 1.3 mm Survey of Dust Polarization in Star-forming Cores and Regions,” 2014, ApJS, 213, 13

Hull, C. L. H., Plambeck, R. L. et al., “Misalignment of Magnetic Fields and Outflows in Protostellar Cores,” 2013, ApJ, 768, 159

Hull, C. L. H., Bower, G. C., Croft, S., Williams, P. K. G., Law, C., Whysong, D., “Primary Beam Shape Calibration from Mosaicked, Interferometric Observations,” 2010, PASP, 122, 1510

Watson, D. M., Bohac, C. J., Hull, C., Forrest, W. J., Furlan, E., Najita, J., Calvet, N., d’Alessio, P., Hartmann, L., Sargent, B., Green, J. D., Kim, K. H., Houck, J. R., “The development of a protoplanetary disk from its natal envelope,” 2007, Nature, 448, 1026