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Astrophysics Group

Prof. Friedrich (Fritz) Röpke, Universität Heidelberg

Our group Physics of Stellar Objects is now part of the Heidelberg Institute for Theoretical Studies (HITS). Prof. Fritz Röpke is professor at the Zentrum für Astronomie, belonging to Heidelberg University, and group leader at HITS.

Before moving to Heidelberg, our group was part of the Astronomy Chair at the Institute of Theoretical Physics and Astrophysics (ITPA) at the Julius-Maximilians Universität Würzburg, Germany.

Part of the group was funded by the Emmy Noether project "Comprehensive Modeling of Type Ia Supernova Explosions". Additional information can be found on Friedrich (Fritz) Röpke's personal webpage.

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Upcoming group meeting.


News

Upcoming events

  • Our research is featured in an article at the Gauss Centre for Supercomputing.

Past events

  • The 10th Würzburg Workshop took place on July 21/22, 2016.
  • The 9th Würzburg Workshop took place on December 17/18, 2015.
  • The 8th Würzburg Workshop took place on July 9/10, 2015. The program is available now!
  • The 7th Würzburg Workshop took place on December 18/19, 2014. The schedule is finished.
  • Wolfram Schmidt from University of Göttingen will visit on December 8. He will give a talk about “Turbulence in the Cosmic Web” at 11am in room 30.03.007.
  • September 22-26: Annual Meeting of the Astronomische Gesellschaft 2014 with splinter meeting Exploding stellar transients on Tuesday/Wednesday, September 23/24, 14:00 – 18:00 in Bamberg.
  • July 14/15 Bernhard Müller visiting from Monash University, Australia; talk on “Core-Collapse Supernova Simulations - Challenges and Perspectives” on Tuesday, July 15, 2pm in room 31.00.017
  • The 6th Würzburg Workshop took place on July 10./11., 2013. Here is the schedule.
  • Ruth Durrer (Université de Genève) gave a talk on “What do we know about dark energy?” as part of our Graduate School Seminar series on June 12, 2014
  • Volker Springel (Heidelberger Institut für Theoretische Studien, HITS) gave the Physics Colloquium on “Forming the milky way in a supercomputer” on June 2, 2014
  • Eiichiro Komatsu (Max Planck Institute for Astrophysics, Garching) gave a talk on the “Physics of the Cosmic Microwave Background” as part of our Graduate School Seminar series on April 17, 2014
  • Ringberg Workshop "Nuclear Astrophysics XVII", Tegernsee, Germany, April 7 – 12, with talks given by several group members
  • Wolfgang Hillebrandt from the Max Planck Institute for Astrophysics, Garching, visited on January 23 and gave a talk on “Explosive Nucleosynthesis” as part of our Graduate School Seminar series.
  • The 5th Würzburg Workshop took place on December 19./20., 2013.
  • Christian Iliadis from the University of North Carolina, USA visited on December 10 to 13 and gave a lecture series on “Nuclear astrophysics” (schedule)
  • René Reifarth from Goethe Universität Frankfurt visited on November 21 and gave a talk on “Astrophysics with unstable nuclei at FAIR and FRANZ” as part of our Graduate School Seminar series
  • On October 24, 2013, Alain Coc from CSNSM Orsay was visiting and gave a talk on “Big Bang Nucleosynthesis” as part of our Graduate School Seminar series
  • On September 11, 2013, Stuart Sim from Queen's University Belfast gives a talk at 2.15pm about 'AGN disc winds: interpreting the X-ray spectra of accreting super-massive black holes'.
  • On September 5, 2013, Wolfgang Kerzendorf from the University of Toronto will talk at 2.15pm about his research on searches for SN Ia progenitors and on radiative transfer modeling.
  • On July 10, 2013, Benedikt Diemer from the University of Chicago will present his research results about fitting SN Ia light curves in our group meeting at 1pm.
  • The FRANCI ’13 meeting took place on Friday, July 5, 2013 starting at 10 am in Würzburg.
  • The 4th Würzburg Workshop, Summer 2013 took place Tuesday and Wednesday, June 25./26., 2013.
  • On June 20, 2013, Reinhard Meinel from the University of Jena was visiting and gave a talk on “Black Holes” as part of our Graduate School Seminar series
  • On June 6, 2013, Thomas Janka from the Max Planck Institute for Astrophysics, Garching, was visiting and gave a talk on “Core Collapse Supernovae” as part of our Graduate School Seminar series
  • On April 28/29, 2013, Rüdiger Pakmor from the Heidelberg Institute for Theoretical Studies will give a 2-day indroduction to the Arepo code
  • On May 2, 2013, David Blaschke from the University of Wroclaw will be visiting. He will give a talk on “Proving the existence of the QCD critical point by compact star observations” as part of our Graduate School Seminar series (14:15, room 30.00.017)
  • Talk on April 26, 2013: Philipp Edelmann from MPA Garching (12:00 probably in room 31.00.017) will cover two topics: “Spurious Instabilities in Low Mach Number Simulations” and “Using the Taylor-Green Vortex to Investigate Turbulence Behavior of Different Hydro Codes” (Special Group Meeting)
  • Talk on April 26, 2013: Hannes Grimm-Strele from the University of Vienna (14:30 probably in room 31.00.017) will talk “On the Use of Curvilinear Grids for Spherical Shells and Other Complex Domains” (Astro Seminar)
  • Christmas party of the Würzburg Astronomy Chair, December 17, 2012, 3pm.
  • 3rd Würzburg Workshop on Supernovae and Related Topics, December 13/14, 2012
  • September, 10 – 14, 2012: Conference in Garching “Supernovae Illuminating the Universe: from Individuals to Populations”

Teaching

For more information about the group's current teaching activities, please refer to the dedicated teaching page.

Research

Our group aims at gaining a sound theoretical understanding of the explosion phase of Type Ia supernovae (SNe Ia). These objects have been applied as cosmological distance indicators and led to the discovery of the currently accelerated expansion of the universe.

This implies a new “Dark Energy” form to dominate the universe and SNe Ia can again be instrumental in constraining its equation of state. Such measurements, however, rely on empirical calibration techniques and a sound theoretical understanding of SNe Ia is required to increase their reliability and accuracy.

Over the past years, observational campaigns produced a wealth of high-quality data calling for a theoretical interpretation. Only models can provide answers to questions concerning the accuracy, possible systematic errors and evolutionary effects in the distance measurements.

With sophisticated three-dimensional numerical simulations several options in building such models will be explored and the results will be compared with observations. The objective is to contribute to the understanding of SNe Ia by developing a theoretical scenario consistent with prototypical SNe Ia explosions and capable of reproducing the observed range of variability among SNe Ia.

On the basis of this work, a suite of numerical simulations is to be constructed varying initial parameters of the explosion process. From these, the origin the diversity of SNe Ia shall be identified and consequences for the calibration of cosmological distance determinations and its far-reaching implications shall be derived.

List of publications

Group Members

room phone ext. email
Prof. Dr. Friedrich Röpke 31.01.017 84230 friedrich.roepke@astro.uni-wuerzburg.de
Dr. Philipp Edelmann 31.01.004 83031 philipp.edelmann@astro.uni-wuerzburg.de
Dipl.-phys. Alejandro Bolaños 31.01.001 91229 abolanos@astro.uni-wuerzburg.de
Dipl.-phys. Kai Marquardt 31.01.002 88026 kmarquardt@astro.uni-wuerzburg.de
Dipl.-phys. Sebastian Ohlmann 31.01.003 88468 sohlmann@astro.uni-wuerzburg.de
Aron Michel 31.01.002 aron.michel@physik.uni-wuerzburg.de
Manuel Schrauth 31.01.018 mschrauth@astro.uni-wuerzburg.de
Joshua Orth 31.01.018 jorth@astro.uni-wuerzburg.de
Leonhard Horst 31.01.001 leonhard.horst@astro.uni-wuerzburg.de

We are located in Building 31 on Campus Hubland Nord. The phone numbers are (+49) 931 31 [phone ext].

Contact

Prof. Dr. Friedrich Röpke
Universität Würzburg
Institut für Theoretische Physik und Astrophysik
Campus Hubland Nord
Emil-Fischer-Str. 31
D-97074 Würzburg
Germany

Phone: (+49) 931 31 84230
Fax: (+49) 931 31 84603

Secretary: Mrs. Karin Kuhns
Phone: (+49) 931 31 85031 (Mon – Thu 1pm – 5pm)

Mail: friedrich.roepke@astro.uni-wuerzburg.de

start.txt · Last modified: 2016/08/16 09:07 by sohlmann