NSF faces choice between multibillion-dollar projects after board sets cost cap.
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Glare from proposed green hydrogen plant could degrade views of distant universe.
View Article and Find Full Text PDFPhosphazene base-catalyzed telescopic three-component reaction involving 1,1-difunctionalization of electron-deficient alkenes.
Chem Commun (Camb)
December 2024
Department of Chemistry, Graduate School of Science, Tohoku University, Aramaki, Aoba-ku, Sendai 980-8578, Japan.
Article Synopsis
- - P2-Bu, a phosphazene base, effectively catalyzes a three-component reaction that combines diethyl phosphite, cinnamonitrile derivatives, and -Boc imines to create β-aminophosphonates.
- - This reaction is notable for producing compounds with a tetrasubstituted carbon while maintaining high levels of diastereoselectivity.
- - It introduces a new approach for a rare reaction type called 1,1-difunctionalization of an electron-deficient alkene, expanding the methods available for reactions catalyzed by Brønsted bases.
A giant planet transiting a 3-Myr protostar with a misaligned disk.
Nature
November 2024
Department of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA, USA.
Astronomers have found more than a dozen planets transiting stars that are 10-40 million years old, but younger transiting planets have remained elusive. The lack of such discoveries may be because planets have not fully formed at this age or because our view is blocked by the protoplanetary disk. However, we now know that many outer disks are warped or broken; provided the inner disk is depleted, transiting planets may thus be visible.
View Article and Find Full Text PDFThe 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.
Atacama Large Aperture Submillimeter Telescope (AtLAST) science: Our Galaxy.
Open Res Eur
June 2024
Institute of Theoretical Physics, University of Oslo, Blindern, Oslo, 0315, Norway.
Article Synopsis
- Researchers are studying the multi-scale interstellar medium (ISM) of our Galaxy to understand the relationships between gas, dust, and star formation in Giant Molecular Clouds (GMCs).
- The Milky Way's complex structure is influenced by massive stars and dust lanes, making it essential to observe these features at (sub-)millimeter wavelengths for in-depth analysis.
- A proposed 50m single-dish sub-mm telescope called AtLAST aims to provide comprehensive observations of the Galactic Plane and surrounding areas to enhance our understanding of stellar formation, planetary system evolution, and the overall ecology of our Galaxy.
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