research Image Credit: Bill Saxton, NRAO/AUI; KALYPSO project, Harvard/CfA Travel Google Scholar |  arXiv |  ADS |  CV | 

My research currently focuses on star formation, dust polarization, and millimeter radio instrumentation.

I am the principal investigator (PI) of the TADPOL collaboration, which comprises 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, and were published in the Astrophysical Journal (click here) in 2013.

Along with Dick Plambeck, a research astronomer at UC Berkeley, I tested, installed, and calibrated the CARMA dual-polarization receiver system, which has been available to all observers since the spring of 2012.

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., 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

Krumholz, M. R., Crutcher, R. M., Hull, C. L. H., “Protostellar Disk Formation Enabled by Weak, Misaligned Magnetic Fields,” 2013, ApJL, 767, 11

Hughes, A. M., Hull, C. L. H., Wilner, D. J., Plambeck, R. L., “Interferometric Upper Limits on Millimeter Polarization of the Disks around DG Tau, GM Aur, and MWC 480,” 2013, AJ, 145, 115

Hull, C., Plambeck, R., & Engargiola, G., “1 mm Dual-polarization Science with CARMA,” 2011, in General Assembly and Scientific Symposium, 2011 XXXth URSI, 1–4

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