Results 91 to 100 of about 362,838 (268)

Shallow Ultraviolet Transits of WD 1145+017 [PDF]

, 2019
WD 1145+017 is a unique white dwarf system that has a heavily polluted atmosphere, an infrared excess from a dust disk, numerous broad absorption lines from circumstellar gas, and changing transit features, likely from fragments of an actively ...
Dalba, Paul A., Debes, John, Dufour, Patrick, Fortin-Archambault, Maude, Fukui, Akihiko, Gary, Bruce, Hallakoun, Na'ama, Jura, Michael A., Klein, Beth, Kusakabe, Nobuhiko, Muirhead, Philip S., Narita, Norio, Steele, Amy, Su, Kate Y. L., Vanderburg, Andrew, Watanabe, Noriharu, Xu, Siyi, Zhan, Zhuchang, Zuckerman, Ben   +18 more
core   +1 more source

Commentary on the role of polyoxometalates in nature cybernetic loop

Natural Sciences, Volume 4, Issue 2-3, June-July 2024.
Polyoxometalates (POMs) are both synthetic and naturally occurring coordination compounds. In the biosphere, POMs can participate in many different life‐determining geochemical and biological processes. Future interdisciplinary research on POMs may reveal their potential for prebiotic and abiotic chemistry, as well as for the development of artificial ...
Kirill Yu. Monakhov
wiley   +1 more source

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

The Astrophysical Journal Letters
We present follow-up imaging and spectroscopy and pre-explosion imaging of SN 2025pht located in NGC 1637 at 12 Mpc. Our spectroscopy shows that SN 2025pht is a Type II supernova (SN) with broad lines of hydrogen and with minimal line-of-sight extinction
Charles D. Kilpatrick, Aswin Suresh, Kyle W. Davis, Maria R. Drout, Ryan J. Foley, Alexander Gagliano, Wynn V. Jacobson-Galán, Ravjit Kaur, Kirsty Taggart, Jason Vazquez   +9 more
doaj   +1 more source

AC Her: Evidence of the First Polar Circumbinary Planet

The Astrophysical Journal Letters, 2023
We examine the geometry of the post–asymptotic giant branch (AGB) star binary AC Her and its circumbinary disk. We show that the observations describe a binary orbit that is perpendicular to the disk with an angular momentum vector that is within 9° of ...
Rebecca G. Martin, Stephen H. Lubow, David Vallet, Narsireddy Anugu, Douglas R. Gies   +4 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

Equatorial Enhancement in the Dustiest OH/IR Stars in the Galactic Bulge

The Astrophysical Journal
We have detected the 10 μ m silicate feature and the 11.3 μ m crystalline forsterite feature in absorption in 21 oxygen-rich asymptotic giant branch stars in the Galactic bulge.
Steven R. Goldman, Jacco Th. van Loon, Olivia C. Jones, Joris A. D. L. Blommaert, Martin A. T. Groenewegen   +4 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

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

A Search for Infrared Emission from Core-Collapse Supernovae at the Transitional Phase

, 2012
Most of the observational studies of supernova (SN) explosions are limited to early phases (< a few yr after the explosion) of extragalactic SNe and observations of SN remnants (> 100 yr) in our Galaxy or very nearby galaxies.
Andrews, Artyukhina, Baars, Bode, Bouchet, Bouchet, Cherchneff, Chu, Chugai, Dale, Dopita, Draine, Dwek, Dwek, Dwek, Dwek, Edoh, Fox, Fox, Fox, Freedman, Gordon, Graham, Hidehiro Kaneda, Hideo Matsuhara, Hines, Immler, Immler, Itsuki Sakon, Kaneda, Keiichi Maeda, Ko Arimatsu, Kotak, Kozasa, Lenz, Liszt, Lorente, Masaomi Tanaka, Meikle, Meikle, Meikle, Mezger, Montes, Murakami, Méndez, Nozawa, Nozawa, Nozawa, Nozawa, Onaka, Petre, Rho, Rho, Rieke, Ryo Ohsawa, Sakon, Schlegel, Schlegel, Schlegel, Schlegel, Schoniger, Seok, Sibthorpe, Skrutskie, Smith, Smith, Smith, Soria, Sugerman, Swinyard, Takashi Onaka, Takaya Nozawa, Takehiko Wada, van Dyk, Werner, Williams   +75 more
core   +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