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The cool brown dwarf Gliese 229 B is a close binary.
Nature
October 2024
European Southern Observatory, Garching, Germany.
Article Synopsis
- Brown dwarf companions to stars help us understand planet formation processes, but some of them are more massive than expected based on their luminosities and host star ages.
- Gliese 229 B, previously thought to be a single entity, was revealed through observations to actually be two brown dwarfs, Gliese 229 Ba and Bb, with masses of 38.1 and 34.4 Jupiter masses, respectively.
- This discovery challenges existing theories and raises questions about the formation and occurrence of binary brown dwarfs in close orbits around stars.
Article Synopsis
- Researchers found that the subseafloor crust harbors not only microbes and viruses, but also animals like the giant tubeworm Riftia pachyptila, suggesting a link between seafloor and subseafloor ecosystems.
- The study proposes that tubeworm larvae may travel through the hydrothermal vent fluid rather than dispersing in the open water.
- The discovery of these animals in the subseafloor has significant implications for understanding geochemical processes and highlights the necessity of protecting these habitats, which are not yet fully understood.
Transition metals and oxidation reactions trigger stargate opening during the initial stages of the replicative cycle of the giant Tupanvirus.
mBio
October 2024
Department of Molecular and Cell Biology, University of Connecticut, Storrs, Connecticut, USA.
Article Synopsis
- Tupanviruses are a type of virus that infect special cells in the immune system called phagocytes.
- Scientists discovered how certain metal ions and hydrogen peroxide can cause these viruses to open up in a specific way.
- This opening might release the part of the virus that is needed to start an infection, making the treated viruses no longer able to infect cells.
Shedding Light on the Origin of ^{204}Pb, the Heaviest s-Process-Only Isotope in the Solar System.
Phys Rev Lett
August 2024
European Organization for Nuclear Research (CERN), Switzerland.
Asymptotic giant branch stars are responsible for the production of most of the heavy isotopes beyond Sr observed in the solar system. Among them, isotopes shielded from the r-process contribution by their stable isobars are defined as s-only nuclei. For a long time the abundance of ^{204}Pb, the heaviest s-only isotope, has been a topic of debate because state-of-the-art stellar models appeared to systematically underestimate its solar abundance.
View Article and Find Full Text PDFBarrier crossing in a viscoelastic medium under active noise: Predictions of Kramers' flux-over-population method.
J Chem Phys
July 2024
Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore 560012, Karnataka, India.
The biochemical activity inside a cell has recently been suggested to act as a source of hydrodynamic fluctuations that can speed up or slow down enzyme catalysis [Tripathi et al., Commun. Phys.
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