Tootfinder

"Hades 2" angespielt: Götterdämmerung
Supergiant Games legt noch einen drauf: Das Hack'n Slash "Hades 2" ist größer, schöner und abwechslungsreicher als der preisgekrönte Vorgänger.
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Same!
#Hades2 #Hades #Gaming
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A constant upper luminosity limit of cool supergiant stars down to the extremely low metallicity of I Zw 18
Abel Schootemeijer, Ylva G\"otberg, Norbert Langer, Giacomo Bortolini, Alec S. Hirschauer, Lee Patrick
https://arxiv.org/abs/2510.12594

A constant upper luminosity limit of cool supergiant stars down to the extremely low metallicity of I Zw 18
Stellar wind mass loss is often assumed to depend on their metallicity $Z$. Therefore, evolutionary models of massive stars at lower $Z$ are able to retain more of their H-rich layers and evolve into brighter cool supergiants (cool SGs; $T_\mathrm{eff} < 7$ kK). Surprisingly, in galaxies in the range $0.2 \lesssim Z / Z_\odot \lesssim 1.5$ previous studies did not find a $Z$-dependence of the upper luminosity limit $L_\mathrm{max}$ of cool SGs. Here, we study four extra galaxies with HST and JW…

The Type II SN 2025pht in NGC 1637 - A Red Supergiant with Carbon-rich Circumstellar Dust as the First JWST Detection of a #Supernova Progenitor Star: https://iopscience.iop.org/article/10.3847/2041-8213/ae04de -> Webb Telescope unveils doomed star hidden in dust: https://news.northwestern.edu/stories/2025/10/webb-telescope-unveils-doomed-star-hidden-in-dust?fj=1 - new finding could help solve the mystery of the missing massive red supergiants.

Hidden massive eclipsing binaries in red supergiant systems: The hierarchical triple system KQ Puppis and other candidates
D. Jadlovsk\'y, L. Moln\'ar, A. Ercolino, M. Bernini-Peron, A. M\'erand, J. Krti\v{c}ka, L. Wang, R. Z. \'Ad\'am, D. Baade, G. Gonz\'alez-Tor\`a, T. Granzer, J. Jan\'ik, J. Kol\'a\v{r}, K. Kravchenko, N. Langer, L. M. Oskinova, D. Pauli, V. Ramachandran, A. C. Rubio, A. A. C. Sander, K. G. Strassmeier, M. Weber, M. Wittkowski, R. Bra…

Hidden massive eclipsing binaries in red supergiant systems: The hierarchical triple system KQ Puppis and other candidates
The majority of massive stars are part of binary systems that may interact during their evolution. This has important consequences for systems in which one star develops into a Red supergiant (RSG); however, not many RSGs are known binaries. We aim to better constrain the properties of some of the known RSGs in binaries. We first focus on the VV Cephei type RSG KQ Pup (RSG+B-type companion, orbital period of 26 yr), where we have enough data to constrain the system's properties. We use archiv…

Mass loading of outflows from evolving Young Massive Clusters
C. J. K. Larkin, C. Hawcroft, J. Mackey, R. R. Lefever, L. H\"arer, A. A. C. Sander
https://arxiv.org/abs/2510.06100

Mass loading of outflows from evolving Young Massive Clusters
Feedback from Young Massive Clusters (YMCs) is an important driver of galaxy evolution. In the first few Myr, mechanical feedback is dominated by collective effects of the massive stellar winds in the YMC. The mass-loss rates and terminal wind velocities of these stars change by orders of magnitude over pre-SN timescales as the massive stars evolve, and mass-loss rates of Cool Supergiant (CSG) stars in particular are uncertain by a factor $\sim~20$ or more. In this work we perform a first study…

Ultra-long Gamma-ray Bursts from Micro-Tidal Disruption Events: The Case of GRB 250702B
Paz Beniamini, Hagai B. Perets, Jonathan Granot
https://arxiv.org/abs/2509.22779 https://…

Ultra-long Gamma-ray Bursts from Micro-Tidal Disruption Events: The Case of GRB 250702B
Ultra-long gamma-ray bursts (ULGRBs), a rare class of high-energy transients with durations $>10^3$,s, remain poorly understood. GRB,250702B ($z=1.04$) is notable for its multi-hour prompt emission, an X-ray precursor $\sim$1 day earlier, off-nuclear host position, and hard, rapidly variable gamma-rays. This combination is difficult to explain with standard ULGRB progenitors such as blue-supergiant collapsars, magnetar engines, or white-dwarf tidal disruptions by intermediate-mass black holes. …

Luminous Blue Variables
Nathan Smith
https://arxiv.org/abs/2509.22990 https://arxiv.org/pdf/2509.22990

Luminous Blue Variables
Luminous Blue Variables (LBVs) are a class of massive blue supergiants exhibiting irregular and eruptive instability, sometimes accompanied by extreme mass loss. While they have often been considered to be a brief but very important transitional phase in the evolution of massive single stars, mounting evidence suggests that LBVs are actually a phenomenon associated with binary star evolution by way of mass gainers and mergers. If true, this would leave single massive stars without a way to shed…