Results 71 to 80 of about 13,144 (210)

Grain Size in the Class I Protostellar System TMC-1A Constrained with ALMA and Very Large Array Observations

The Astrophysical Journal
The disk mass and substructure in young stellar objects suggest that planet formation may start at the protostellar stage, through the growth of dust grains.
Yusuke Aso, Satoshi Ohashi, Hauyu Baobab Liu, Wenrui Xu   +3 more
doaj   +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

Dust evolution and satellitesimal formation in circumplanetary disks [PDF]

, 2018
It is believed that satellites of giant planets form in circumplanetary disks. Many of the previous contributions assumed that their formation process proceeds similarly to rocky planet formation, via accretion of the satellite seeds, called ...
Drazkowska, Joanna, Szulágyi, Judit
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

Effects of Metallicity on Graphite, TiC, and SiC Condensation in Carbon Stars

The Astrophysical Journal
From transmission electron microscopy and other laboratory studies of presolar grains, the implicit condensation sequence of carbon-bearing condensates in circumstellar envelopes of carbon stars is (from first to last) TiC-graphite-SiC.
Gabrielle M. Adams, Katharina Lodders
doaj   +1 more source

The Dusty Aftermath of the V1309 Sco Binary Merger

, 2013
We present mid-IR photometry and spectra of the merged binary V1309 Sco taken between 18 and 23 months after outburst. Strong mid-IR emission and a solid state absorption feature indicate the presence of a significant amount of dust in the circumstellar ...
Kozłowski, S., Kubiak, M., Melis, C., Nicholls, C. P., Pietrukowicz, P., Pietrzyński, G., Poleski, R., Soszyński, I., Szymański, M. K., Udalski, A., Ulaczyk, K., Wyrzykowski, Ł.   +11 more
core   +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

Multiband ALMA Polarization Observations of BHB 07-11 Reveal Aligned Dust Grains in Complex Spiral Arm Structures

The Astrophysical Journal
Polarization-mode observations from the Atacama Large Millimeter/submillimeter Array (ALMA) are powerful tools for studying the dust grain populations in circumstellar disks.
Austen Fourkas, Leslie W. Looney, Zhe-Yu Daniel Lin, Martin Radecki, Zhi-Yun Li, John J. Tobin, Ian W. Stephens, Manuel Fernández-López, Haifeng Yang, Woojin Kwon, Rachel Harrison   +10 more
doaj   +1 more source

A search for diffuse bands in the circumstellar envelopes of post-AGB stars

, 2007
In this work we present the results of a systematic search for diffuse bands (DBs, hereafter) in the circumstellar envelopes of a carefully selected sample of post-AGB stars.
Allamandola, Arellano, Arkhipova, Bakker, Bujarrabal, Clube, Cohen, Cox, Cox, Crawford, D. A. García Hernández, de Jong, Desmurs, Douglas, Drimmel, Ehrenfreund, Ehrenfreund, Fernie, Fernández de Córdoba, Fitzgerald, Foing, Fujii, Fulara, Galazutdinov, García-Lario, García-Lario, García-Lario, Gauba, Gauba, Gauba, Guarinos, Guarinos, Heap, Heger, Herbig, Herbig, Hrivnak, Hrivnak, Hrivnak, Hrivnak, Hrivnak, Hrivnak, Hrivnak, Hu, Hu, Iglesias-Groth, Iglesias-Groth, Jenniskens, Kendall, Kerr, Klochkova, Klochkova, Klochkova, Krelowski, Krelowski, Krelowski, Kwok, Kwok, Le Bertre, Le Bertre, Le Bertre, Leger, Lewis, M. A. Satorre, Maas, Malfait, Mauron, McCall, Megier, Meixner, Merrill, N. L. J. Cox, O. Suárez, Oudmaijer, P. García Lario, Parthasarathy, Pottasch, Prichet, R. Luna, Reddy, Reddy, Reed, Reyniers, Ruiterkamp, Salama, Salama, Sarre, Sarre, Scarrott, Snow, Snow, Suárez, te Lintel Hekkert, Thorburn, Torres-Peimbert, Turner, Van de Steene, Van der Veen, Van der Zwet, Van Winckel, Van Winckel, Volk, Weselak, Zacs, Zacs, Zacs, Zacs   +106 more
core   +2 more sources

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