The UHH Research Park includes the headquarters for the East Asian Observatory, the Caltech Submillimeter Observatory, Subaru, Gemini, UKIRT, the Smithsonian Submillimeter Array and the Institute for Astronomy, plus the astronomers at the University of Hawaii at Hilo. We are one of the major centres for astronomy in the world and encourage all visitors to the JCMT to take advantage of the proximity of these institutes, and give a seminar while in Hilo. Your talk will be advertised at each of the above institutes.

Upcoming Seminar: November 27th, 2018, 2pm (HST)

Constraining the Physics of Relativistic Jets with X-ray Binaries

Location: EAO Office, Hilo

Alex Tetarenko, EAO

Astrophysical jets are ubiquitous phenomena in our universe, linked to a wide range of objects, from young stars to black holes. These powerful, highly collimated outflows deposit significant amounts of energy and matter into the surrounding medium, affecting star formation, galaxy evolution, and even the distribution of matter in the universe. However, despite decades of research, our current knowledge of the physics that gives rise to and governs the behaviour of these jets is still extremely limited. Of all the systems that launch jets, X-ray binaries are particularly excellent testbeds, as they evolve through bright outburst phases on rapid timescales of days to months, providing a real-time view of how these jets evolve and interact with their environment. In this talk, I will detail new tools and techniques that my team and I are developing to study X-ray binary jets, including utilizing time domain analyses to connect jet variability properties to internal jet physics, and using the astrochemical properties of regions where these jets collide with their local environment to constrain jet structure and energetics. Through this work, we also demonstrate that the relatively untested mm/sub-mm frequency bands provide a unique viewpoint on these jets, and are crucial in allowing us to open up new ways to study jet phenomena across the X-ray binary population.

Upcoming Seminar: December 3rd, 2018, 2pm (HST)

Structure of a protobinary system – an asymmetric circumbinary disk and spiral arms

Location: EAO Office, Hilo

Tomoaki Matsumoto, Hosei University, Japan

Recent high-resolution observations have revealed the early phases of low-mass binary and multiple star formation. Several circumbinary disks exhibit asymmetry and spiral arms as their structures. We performed numerical simulations of the circumbinary disks in order to investigate the formation mechanism of these observed features. The three-dimensional models were calculated by using the so-called fixed mesh refinement to achieve the high resolution around the binary stars. We compared the results of the simulations with the ALMA observations toward the Class I protobinary L1551 NE by using synthetic observations. The comparison demonstrates that these features are an evidence of the interaction between the circumbinary disks and binary stars via the gravitational torque, which promotes gas accretion onto the circumstellar disks and binary stars.

Where and How:

EAO seminars are (usually) held in the second floor conference room at the East Asia Observatory, 660 N. A’ohoku Place, Hilo, Hawaii. Please note that access to EAO is possible only through the main entrance (through the side doors facing Subaru).

If you would like to view the seminar via Polycom or Zoom, please contact the helpdesk well in advance of the talk and we will make sure that the option it available. Polycom contact details or Zoom meeting information will be made available on request.

The EAO phone number is: (808) 961-3756. A full list of past seminar speakers can be found below for the current and previous years. These pages also contain links to PDF copies of the seminar slides and other materials, where available.

To join the Seminar e-mail list:

EAO Seminars are sent out via If you wish to join this seminar list please send an e-mail to

Print Friendly, PDF & Email

Comments are closed.