Universiteit Leiden

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This Week’s Discoveries | 17 May 2016

Tuesday 17 May 2016
Niels Bohrweg 2
2333 CA Leiden
De Sitterzaal

First Lecture

Title: Revolutionizing Our View of Solar System Birth and Binary/Multiple Star Formation
Speaker: John Tobin (Leiden Observatory)

John is a VENI fellow at the Leiden Observatory. He studies the early phases of the star forming process, examining many facets of young stellar objects.

Abstract: It is known that nearly all stars have at least one planet and nearly half of sun-like stars have a companion star. Planets are born within proto-planetary disks surrounding young stars that are thought to form in concert with the star(s) itself. In addition to planets, companion stars may also form within disks if the disks are sufficiently massive. Despite our knowledge on the outcomes of star and planet formation, the formation of proto-planetary disks and companion stars has remained poorly understood observationally, and rapid progress is now being made with using the recently upgraded Very Large Array (VLA) and the recently completed Atacama Large Millimeter/submillimeter Array (ALMA). I will present new results from these observatories that are enabling us to now determine how disks and binary star systems form. I am leading a large international project that is conducting complete surveys protostars to observe the frequency of protostellar disks, the frequency of protostellar multiplicity, and the distribution of companion separations. The results from these projects are enabling us to better understand the early evolution of stars and proto-solar systems.

Second Lecture

Title: Real-Time 3D Tomography
Speaker: Joost Batenburg ( CWI and MI)

Joost Batenburg is professor in Discrete Mathematics and Tomography at the Mathematical Institute and a scientific staff member at the CWI in Amsterdam, where he leads a research team in the field of computational imaging, with a strong focus on tomography. He was awarded a VICI grant from NWO earlier this year for a research proposal entitled: ‘Real-time 3D Tomography’. Tomography is a scanning technique that enables making three-dimensional images of the inside of an object based on a series of X-ray photos. In the VICI project, calculation methods will be developed that will make it possible to already look inside an object during the scan.

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