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Fully compressible simulations of waves and core convection in main-sequence stars

Abstract (Expand)

Context. Recent, nonlinear simulations of wave generation and propagation in full-star models have been carried out in the anelastic approximation using spectral methods. Although it makes long time … steps possible, this approach excludes the physics of sound waves completely and requires rather high artificial viscosity and thermal diffusivity for numerical stability. A direct comparison with observations is thus limited. Aims. We explore the capabilities of our compressible multidimensional Seven-League Hydro (SLH) code to simulate stellar oscillations. Methods. We compare some fundamental properties of internal gravity and pressure waves in 2D SLH simulations to linear wave theory using two test cases: (1) an interval gravity wave packet in the Boussinesq limit and (2) a realistic 3 M⊙ stellar model with a convective core and a radiative envelope. Oscillation properties of the stellar model are also discussed in the context of observations. Results. Our tests show that specialized low-Mach techniques are necessary when simulating oscillations in stellar interiors. Basic properties of internal gravity and pressure waves in our simulations are in good agreement with linear wave theory. As compared to anelastic simulations of the same stellar model, we can follow internal gravity waves of much lower frequencies. The temporal frequency spectra of velocity and temperature are flat and compatible with the observed spectra of massive stars. Conclusion. The low-Mach compressible approach to hydrodynamical simulations of stellar oscillations is promising. Our simulations are less dissipative and require less luminosity boosting than comparable spectral simulations. The fully-compressible approach allows for the coupling of gravity and pressure waves in the outer convective envelopes of evolved stars to be studied in the future.

Authors: L. Horst, P. V. F. Edelmann, R. Andrássy, F. K. Röpke, D. M. Bowman, C. Aerts, R. P. Ratnasingam

Date Published: 1st Sep 2020

Publication Type: Journal

Cataloguing the radio-sky with unsupervised machine learning: a new approach for the SKA era

Abstract

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Authors: T J Galvin, M T Huynh, R P Norris, X R Wang, E Hopkins, K Polsterer, N O Ralph, A N O’Brien, G H Heald

Date Published: 1st Sep 2020

Publication Type: Journal

The VLT-FLAMES Tarantula Survey

Abstract

Not specified

Authors: C. Evans, D. Lennon, N. Langer, L. Almeida, E. Bartlett, N. Bastian, J. Bestenlehner, N. Britavskiy, N. Castro, S. Clark, P. Crowther, A. de Koter, S. de Mink, P. Dufton, L. Fossati, M. Garcia, M. Gieles, G. Gräfener, N. Grin, V. Hénault-Brunet, A. Herrero, I. Howarth, R. Izzard, V. Kalari, J. Maı́z Apellániz, N. Markova, F. Najarro, L. Patrick, J. Puls, O. Ramı́rez-Agudelo, M. Renzo, C. Sabı́n-Sanjulián, H. Sana, F. Schneider, A. Schootemeijer, S. Simón-Dı́az, S. Smartt, W. Taylor, F. Tramper, J. van Loon, J. Villaseñor, J. S. Vink, N. Walborn

Date Published: 1st Sep 2020

Publication Type: Journal

The Art of Modeling Stellar Mergers and the Case of the B[e] Supergiant R4 in the Small Magellanic Cloud

Abstract

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Authors: Samantha Wu, Rosa Wallace Everson, Fabian R. N. Schneider, Philipp Podsiadlowski, Enrico Ramirez-Ruiz

Date Published: 1st Sep 2020

Publication Type: Journal

Advanced Heuristics for Accelerating PaPaRa

Abstract

Not specified

Author: Dimitri Höhler

Date Published: 1st Sep 2020

Publication Type: Master's Thesis

The first 10 years of the international coordination network for standards in systems and synthetic biology (COMBINE)

Abstract (Expand)

This paper presents a report on outcomes of the 10th Computational Modeling in Biology Network (COMBINE) meeting that was held in Heidelberg, Germany, in July of 2019. The annual event brings together … researchers, biocurators and software engineers to present recent results and discuss future work in the area of standards for systems and synthetic biology. The COMBINE initiative coordinates the development of various community standards and formats for computational models in the life sciences. Over the past 10 years, COMBINE has brought together standard communities that have further developed and harmonized their standards for better interoperability of models and data. COMBINE 2019 was co-located with a stakeholder workshop of the European EU-STANDS4PM initiative that aims at harmonized data and model standardization for in silico models in the field of personalized medicine, as well as with the FAIRDOM PALs meeting to discuss findable, accessible, interoperable and reusable (FAIR) data sharing. This report briefly describes the work discussed in invited and contributed talks as well as during breakout sessions. It also highlights recent advancements in data, model, and annotation standardization efforts. Finally, this report concludes with some challenges and opportunities that this community will face during the next 10 years.

Authors: Dagmar Waltemath, Martin Golebiewski, Michael L Blinov, Padraig Gleeson, Henning Hermjakob, Michael Hucka, Esther Thea Inau, Sarah M Keating, Matthias König, Olga Krebs, Rahuman S Malik-Sheriff, David Nickerson, Ernst Oberortner, Herbert M Sauro, Falk Schreiber, Lucian Smith, Melanie I Stefan, Ulrike Wittig, Chris J Myers

Date Published: 24th Aug 2020

Publication Type: Journal

The windblown: possible explanations for dinophyte DNA in forest soils

Abstract

Not specified

Authors: Marc Gottschling, Lucas Czech, Frédéric Mahé, Sina Adl, Micah Dunthorn

Date Published: 10th Aug 2020

Publication Type: Journal

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