Subaru Seminars



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Subaru Seminars are usually held in Room 104 of the Hilo Base Facility, adjacent to the main lobby. Everyone is welcome to attend. If you would like to give a seminar, please contact Subaru seminar organizers (Rusu Cristian Eduard, Tae-Soo Pyo, Nagayoshi Ohashi) by email : sseminar_at_subaru.naoj.org (please change"_at" to @).

September 18, Tuesday, 11am in 104A

" Astrometry and multiplicity of substellar companions"

Per Calissendorff (Stockholms University)


Multiple systems of stars and substellar objects prove to be excellent benchmarks for testing evolutionary models. By monitoring the motions of the components in the systems we can derive orbital solutions that yield robust dynamical masses to test against the theoretical models, as they are not alway in agreement and especially apparent for low-mass systems. Because not many multiple systems in the low-mass regime with short enough periods to obtain orbital solutions in reasonable time-frames have been observed, systems with constrained orbits become important calibrators for the models. In this talk I will present results from some of our ongoing astrometric surveys using different direct imaging techniques to detect and monitor multiple systems, stretching from low-mass stars down to planetary-mass brown dwarfs, and how we can better improve their orbital solutions to obtain better constrained dynamical masses.


Seminars are also held at JAC, CFHT, and IfA.



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