Results 71 to 80 of about 293,009 (201)

Dust-evacuated Zones near Massive Stars: Consequences of Dust Dynamics on Star-forming Regions

The Astrophysical Journal
Stars form within dense cores composed of both gas and dust within molecular clouds. However, despite the crucial role that dust plays in the star formation process, its dynamics is frequently overlooked, with the common assumption being a constant ...
Nadine H. Soliman, Philip F. Hopkins, Michael Y. Grudić   +2 more
doaj   +1 more source

The deep eclipses of RW Aur revisited by long‐term photometric and spectroscopic monitoring

Astronomische Nachrichten, Volume 345, Issue 4, May 2024.
Abstract RW Aurigae is a young stellar system containing a classical T Tauri star as the primary component. It shows deep, irregular dimmings, first detected in 2010. At the University Observatory Jena, we carried out optical follow‐up observations. We performed multiband (BVRI) photometry of the system with the Cassegrain‐Teleskop‐Kamera II and the ...
Oliver Lux, Markus Mugrauer, Richard Bischoff   +2 more
wiley   +1 more source

Evidence for the Disruption of a Planetary System During the Formation of the Helix Nebula

The Astronomical Journal, 2022
The persistence of planetary systems after their host stars evolve into their post-main-sequence phase is poorly constrained by observations. Many young white dwarf systems exhibit infrared excess emission and/or spectral absorption lines associated with
Jonathan P. Marshall, Steve Ertel, Eric Birtcil, Eva Villaver, Francisca Kemper, Henri Boffin, Peter Scicluna, Devika Kamath   +7 more
doaj   +1 more source

Limitations of the modified blackbody fit method for determining molecular cloud properties

Astronomische Nachrichten, Volume 345, Issue 4, May 2024.
Abstract Achieving a comprehensive understanding of the star and planet formation process is one of the fundamental tasks of astrophysics, requiring detailed knowledge of the physical conditions during the different phases of this process. During the earliest stages, that is, concerning physical processes in molecular clouds and filaments, the column ...
Niko Zielinski, Sebastian Wolf
wiley   +1 more source

Extreme Debris Disks: Insights into Violent Collisions in Planet Formation and Destruction

The Astrophysical Journal
Debris disks are dusty structures around mature stars, primarily identified by infrared excesses in the stellar spectra. A subset, known as extreme debris disks (EDDs), exhibits stochastic infrared variability, believed to result from large-scale violent
Kate Y. L. Su, Attila Moór, Ágnes Kóspál, George H. Rieke, Antranik A. Sefilian, Renu Malhotra, Ilaria Pascucci, Alan P. Jackson, Péter Ábrahám, Nicholas P. Ballering   +9 more
doaj   +1 more source

Isomerism of CH2SO: Accurate structural, energetic, and spectroscopic characterization

Journal of Computational Chemistry, Volume 45, Issue 11, Page 777-786, April 30, 2024.
What is the next sulfur‐containing molecule that will be detected in space? Guided by the experimental data on the cis‐/trans‐HC(O)SH conformers, the structural and spectroscopic properties of cis‐/trans‐HC(S)OH have been accurately determined using state‐of‐the‐art quantum‐chemical approaches. Abstract A recent work [Ye et al. Mon. Not. R. Astron. Soc.
Cristina Puzzarini, Hexu Ye, Silvia Alessandrini   +2 more
wiley   +1 more source

A MODEL OF SILICATE GRAIN NUCLEATION AND GROWTH IN CIRCUMSTELLAR OUTFLOWS

The Astrophysical Journal, 2011
Based on its abundance, high bond energy, and recent measurements of its vapor pressure SiO is a natural candidate for dust nucleation in circumstellar outflows around asymptotic giant branch stars. In this paper, we describe a model of the nucleation and growth of silicate dust in such outflows.
John A. Paquette, Frank T. Ferguson, Joseph A. Nuth   +2 more
openaire   +1 more source

Chiroptical properties of membrane glycerophospholipids and their chiral backbones

Chirality, Volume 36, Issue 3, March 2024.
Examination of the interaction of glycerophospholipids with circularly polarized light suggests that direct induction of symmetry breaking to membrane lipids by chiral photons is unlikely. However, anisotropy spectra of certain analogs indicate potential alternative mechanisms for the origins of membrane lipid homochirality, providing insights into the
Jana Bocková, Adrien D. Garcia, Nykola C. Jones, Søren V. Hoffmann, Cornelia Meinert   +4 more
wiley   +1 more source

Detection of Water ICE Grains on the Surface of the Circumstellar Disk Around HD 142527

, 2008
Coronagraphic imaging for the Herbig Ae star, HD 142527, was performed using the Coronagraphic Imager with Adaptive Optics (CIAO) on the 8.2 m Subaru Telescope.
明憲, 岡., Kudo, T., Honda, M., 泰史, 中本, Oka, A., Ishii, M., Nakamoto, T., Kawakita, H., Shibai, H., Tamura, M., Inoue, A. K., Okamoto, Y. K., Fukagawa, M., Takato, N., Terada, H., Itoh, and Y.   +15 more
core   +1 more source

L1448 IRS3B: Dust Polarization Aligned with Spiral Features, Tracing Gas Flows

The Astrophysical Journal
Circumstellar disk dust polarization in the (sub)millimeter is, for the most part, not from dust grain alignment with magnetic fields but rather indicative of a combination of dust self-scattering with a yet unknown alignment mechanism that is consistent
Leslie W. Looney, Zhe-Yu Daniel Lin, Zhi-Yun Li, John J. Tobin, Martin Radecki, Syzygy Butte, Ian W. Stephens, Manuel Fernández-López, Haifeng Yang, Nickalas K. Reynolds, Patrick Sheehan, Woojin Kwon, Rachel Harrison, Allen North   +13 more
doaj   +1 more source