Professor, CITAInterstellar matter, H2: collisional rate ceofficients, Canadian Galactic Plane Survey, infrared imaging: HiRes, MSX and SIRTF, H II regions: Orion, structure, dynamics and chemical abundances, dust: interstellar polarization.Ph.D. 1972, Cambridge
I study astrophysical fluid dynamics with an emphasis on star formation, stellar feedback in the interstellar medium, accretion, and explosive transients, using analytical studies, numerical simulations, and observations. Recent projects include ways to constrain the interactions between star clusters and galaxies, models for star cluster feedback in starburst galaxies, a catalog of young giant star clusters, long-duration modeling of stellar tidal disruptions, new models for supernova shocks and the dynamics of gamma-ray bursts, simulations of massive black hole accretion, fragmentation criteria in star and planet formation, models for protostellar outflows and their interaction with molecular clouds, and models for giant molecular cloud evolution.
My research focuses on reconstructing the formation conditions of the Milky Way using the positions, kinematics, ages, and chemical compositions of pulsating variable stars. I use data from proprietary surveys and publicly available databases, including (but not limited to) the Halo Outskirts With VAriable STars (HOWVAST), the Southern Stellar Stream Spectroscopic Survey (S⁵), and the Gaia mission. These projects are pivotal to lay the groundwork for exploiting the large amount of data upcoming in the next generation of large sky surveys.
I am an observational cosmologist that develops novel instrumentation and analysis techniques for studying the origin, composition, and evolution of the universe. One of such instruments is the Canadian Hydrogen Intensity Mapping Experiment (CHIME), a ground-breaking radio telescope that is mapping the large-scale structure of neutral hydrogen to constrain the expansion history of the universe. Thanks to its unique design and powerful digital backend, CHIME has also become a leading facility for studying the radio transient sky, including the mysterious fast radio bursts (FRBs). I am now focused on the development of CHIME/FRB Outriggers and the Canadian Hydrogen Observatory and Radio-transient Detector (CHORD), next-generation telescope arrays that will provide unprecedented observational capabilities for cosmology and radio transient science.
My primary research interest in theoretical astrophysics is the study of the structure and evolution of planets, accretion discs and stars. The fluid dynamics of these objects is a topic I particularly enjoy exploring, through a combination of analytical and numerical simulation work.
Development and operation of instruments for small satellites such as BRITE Constellation. Properties and evolution of contact binary stars. Techniques for accurate computation of light curves and spectral line profiles of close binary stars, including previously neglected numerical and relativistic effects. Spectroscopy of late-type stars, their rotation and variation
ProfessorExperimental astrophysics and astronomical instrumentation (IR and optical),compact objects (black holes, neutron stars, and X-ray binaries), supernovae and GRBs, supernova remnants, highly-obscured hard X-ray sourcesPh.D Cornell, 2004
My research interest lies primarily in experimental astrophysics and astronomical instrumentation, along with observational studies of various objects. I’ve developed instruments, especially infrared spectrographs (e.g., WIFIS, NIRES, MOSMAS), and am interested in advancing novel devices (e.g., polarization gratings) and techniques for astronomical applications. Observationally, I am more interested in objects with high-energy phenomena, such as supernovae and supernova remnants (both stellar and gaseous), optical transients, ultra-luminous X-ray sources and massive stars.