Results 101 to 110 of about 13,043 (174)

Molecules and Chemistry in Red Supergiants

Galaxies
The envelopes of Red Supergiants (RSGs) have a unique chemical environment not seen in other types of stars. They foster an oxygen-rich synthesis but are tempered by sporadic and chaotic mass loss, which distorts the envelope and creates complex outflow ...
Lucy M. Ziurys, Anita M. S. Richards
doaj   +1 more source

Dust distribution in circumstellar disks harboring multi-planet systems

Astronomy & Astrophysics
Context. Theoretical formation models and exoplanet detection surveys indicate that systems with multiple giant planets are common. Aims. We investigate how multiple super-thermal-mass planets embedded in a circumstellar disk shape the dust distribution ...
Roatti V., Picogna G., Marzari F.
doaj   +1 more source

Subtle and Spectacular: Diverse White Dwarf Debris Disks Revealed by JWST

The Astrophysical Journal Letters
This Letter reports 12 novel spectroscopic detections of warm circumstellar dust orbiting polluted white dwarfs using the JWST Mid-Infrared Instrument (MIRI). The disks span 2 orders of magnitude in fractional infrared brightness and more than double the
J. Farihi, K. Y. L. Su, C. Melis, S. J. Kenyon, A. Swan, S. Redfield, M. C. Wyatt, J. H. Debes   +7 more
doaj   +1 more source

Confined Circumstellar Material as a Dust Formation Site in Type II Supernovae

The Astrophysical Journal
We propose a model for dust formation in Type II supernovae (SNe) interacting with confined circumstellar material (CSM), motivated by recent time-domain surveys that have revealed a substantial fraction of SN progenitors to be surrounded by CSM ejected ...
Yuki Takei, Kunihito Ioka, Masaru Shibata   +2 more
doaj   +1 more source

Dust dynamics in planet-forming discs in binary systems. [PDF]

Eur Phys J Plus, 2023
Zagaria F, Rosotti GP, Alexander RD, Clarke CJ.   +3 more
europepmc   +1 more source

PO and PN in the Envelope of VY Canis Majoris: Elucidating the Chemistry and Origin of Phosphorus

The Astrophysical Journal Letters
The J = 5.5 → 4.5 and J = 5 → 4 transitions of PO and PN, respectively, have been imaged in the envelope of hypergiant star VY Canis Majoris (VY CMa) using the Atacama Large Millimeter/submillimeter Array with angular resolutions of 0.″2 and 1.″5 and ...
R. Ravi, A. P. Singh, A. M. S. Richards, R. M. Humphreys, L. Decin, L. M. Ziurys   +5 more
doaj   +1 more source

Unconventional gas-phase preparation of the prototype polycyclic aromatic hydrocarbon naphthalene (C₁₀H₈) via the reaction of benzyl (C₇H₇) and propargyl (C₃H₃) radicals coupled with hydrogen-atom assisted isomerization. [PDF]

Chem Sci, 2023
He C, Kaiser RI, Lu W, Ahmed M, Krasnoukhov VS, Pivovarov PS, Zagidullin MV, Azyazov VN, Morozov AN, Mebel AM.   +9 more
europepmc   +1 more source

Nucleation experiments on a titanium-carbon system imply nonclassical formation of presolar grains. [PDF]

Sci Adv, 2023
Kimura Y, Tanaka KK, Inatomi Y, Aktas C, Blum J.   +4 more
europepmc   +1 more source

Crystallization of stardust analogs under an electron flux atmosphere. [PDF]

PNAS Nexus
Shohan RA, Cly C, Speck A, Sargent B, Nuth JA, Whittington A, Ponce A.   +6 more
europepmc   +1 more source

Gas-phase synthesis of the bicyclic silicon tricarbide molecule (c-SiC₃) as a precursor to silicon carbide nanoparticles in space. [PDF]

Chem Sci
Goettl SJ, Fujioka K, Alves MO, Silva MX, Yang Z, Metya S, Medvedkov IA, Sattasathuchana T, Galvão BRL, Sun R, Kaiser RI.   +10 more
europepmc   +1 more source