Brighter Than 100 Billion Stars
“The new group is another important component of our concept, “ says Klaus Tschira who founded the HITS in 2010 as a non-profit research institute. “Research on stellar astrophysics, like Friedrich Röpke does, is a perfect complement of the work of Volker Springel’s group on large-scale processes like galaxy formation.“
Friedrich Röpke (40) studied Physics at the University of Jena and the University of Virginia, Charlottesville/USA, and received his PhD in 2003 from the Technische Universität München. In the following years, he worked as a postdoc at the Max-Planck-Institute for Astrophysics (MPA) in Garching and at the University of California, Santa Cruz/USA.
Friedrich Röpke studies Type Ia supernovae. Observation of these cosmic explosions allows astronomers to determine distances in space. In 2011, the Nobel Prize in Physics was awarded to researchers who proved the accelerated expansion of the Universe with supernovae. The PSO group collaborates closely with one of the laureates from 2011, Brian Schmidt (Australian National University, Canberra) in a program supported by the German Academic Exchange Service DAAD. Friedrich Röpke’s research aims to understand exactly what happens when stars die.
Remnant of SN 1572 as seen in X-ray light from the Chandra X-ray Observatory. The supernova of 1572 is often called “Tycho’s supernova”, because of Tycho Brahe’s extensive work De nova et nullius aevi memoria prius visa stella (“Concerning the Star, new and never before seen in the life or memory of anyone”, published in 1573 with reprints overseen by Johannes Kepler in 1602, and 1610), a work containing both Tycho Brahe’s own observations and the analysis of sightings from many other observers.
“Modelling of supernova explosions is, however, just one part of our research at HITS,” says Friedrich Röpke. “We also strive for a better understanding of how stars evolve and how the elements that make up our world are formed within them.” Classical astrophysics follows stellar evolution based on very simplifying assumptions. “To improve the predictive power of the models, we have to describe the physical processes taking place within stars in a dynamic way,” says the astrophysicist. He and his group have developed a new computer code that – combined with the rapidly increasing capacities of supercomputers – opens new perspectives for the modelling of stars.
In contrast to what we are used to from our solar system, most stars in the Universe exist as part of multiple star systems. The interaction between those stars greatly affects their evolution but the involved physical processes are poorly understood until today. The two astrophysics groups at HITS are cooperating on new computer simulations to bring some light into the darkness.
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