Vorträge, Seminare, Ereignisse

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To arrange a visit with the speaker during the visit, please contact their host: Mike Lau

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In the era of `Precision Cosmology' remarkable advances have been made in the determination of cosmological parameters from the Cosmic Microwave Background and Big Bang Nucleosynthesis, with spectacular concordance between these two pillars of the Standard Cosmological Model. While much exposure has been given to the impressive results from the WMAP and Planck missions, perhaps less attention has been paid to the equally striking advances made in the last ten years in the measurements of the abundances of the light elements forged in the first few minutes of our Universe history. In this talk I shall focus in particular on the determination of the primordial abundance of deuterium, in an overview that spans almost 80 years, from the first seeds of the idea sown in the 1940s to the most recent results and forward look to the era of Extremely Large Telescopes and next generation Wide Field Surveys of the sky. To arrange a visit with the speaker during the visit, please contact their host: Eduardo Banados

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To arrange a visit with the speaker during the visit, please contact their host: Marcelo Alberto Cortes Vergara

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To arrange a visit with the speaker during the visit, please contact their host: Morgan Fouesnau

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To arrange a visit with the speaker during the visit, please contact their host: Genevieve Parmentier

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The formation history of giant planets inside and outside the solar system remains unknown. I will present a new path for giant planet formation where runaway gas accretion is initiated only at a mass of ~100 M_Earth. This suggests that the transition to a gas giant planet, a planet whose composition is dominated by hydrogen and helium, occurs at ~Saturn’s mass. Delaying runaway accretion to later times (a few Myr) and higher masses is likely to be a result of an intermediate stage of efficient heavy-element accretion that provides sufficient energy to hinder rapid gas accretion. This implies that Saturn has never reached runaway gas accretion, and that it is a "failed giant planet". The transition to a gas giant planet above Saturn's mass naturally explains the differences between the bulk metallicities and internal structures of Jupiter and Saturn, and the characteristics of Uranus and Neptune. In terms of giant exoplanets, delaying runaway gas accretion to planets beyond Saturn's mass explains the transitions in the mass-radius (M-R) relations of observed exoplanets and the high metallicity of intermediate-mass exoplanets. To arrange a visit with the speaker during the visit, please contact their host: Saskia Hekker

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APEx Signature Speaker

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To arrange a visit with the speaker during the visit, please contact their host: Brian Reville

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Stellar feedback shapes the multi-phase interstellar medium in galaxies and the stellar initial mass function. Moreover, feedback impacts the large-scale evolution of galaxies by regulating star formation and by driving galactic fountain flows and outflows. Using modern high-performance computing simulations, we can study the relative importance of stellar winds, radiation, and supernovae in shaping the multi-phase interstellar medium. Using these simulations, we find that pre-supernova feedback is highly relevant for regulating star formation. In particular, the ionizing radiation of massive stars is dominating over the impact of non-ionizing radiation or stellar winds. On the other hand, supernovae drive hot bubbles and super-bubbles with substantially higher pressure than the typical midplane pressure of a disk galaxy, thereby pushing gas out into the circum-galactic medium. Additionally, cosmic rays, which are in this context most importantly accelerated by supernova shocks, help to sustain the galactic outflow via a vertical cosmic ray pressure gradient. In this talk, I will give an overview of the importance of stellar feedback for the evolution of galaxies, which we study using numerical simulations. To arrange a visit with the speaker during the visit, please contact their host: Cormac Larkin

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To arrange a visit with the speaker during the visit, please contact their host: Joachim Wambsganss

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To arrange a visit with the speaker during the visit, please contact their host: Nadine Neumayer

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To arrange a visit with the speaker during the visit, please contact their host: Matteo Maturi

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KoCo Signature Speaker (GC)