Results 71 to 80 of about 2,982 (223)

Morphological components analysis for circumstellar disks imaging

, 2020
Recent developments in astronomical observations enable direct imaging of circumstellar disks. Precise characterization of such extended structure is essential to our understanding of stellar systems.
Pairet, Benoît, Cantalloube, Faustine, Jacques, Laurent, iTWIST'20   +3 more
core  

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

Imaging of the Vega Debris System Using JWST/MIRI

The Astrophysical Journal
We present images of the Vega planetary debris disk obtained at 15.5, 23, and 25.5 μ m with the Mid-Infrared Instrument on JWST. The debris system is remarkably symmetric, smooth, and centered accurately on the star.
Kate Y. L. Su, András Gáspár, George H. Rieke, Renu Malhotra, Luca Matrá, Schuyler Grace Wolff, Jarron M. Leisenring, Charles Beichman, Marie Ygouf   +8 more
doaj   +1 more source

Coagulation–Fragmentation Equilibrium for Charged Dust: Abundance of Submicron Grains Increases Dramatically in Protoplanetary Disks

The Astrophysical Journal, 2023
Dust coagulation in protoplanetary disks is not straightforward and is subject to several slowdown mechanisms, such as bouncing, fragmentation, and radial drift to the star.
Vitaly Akimkin, Alexei V. Ivlev, Paola Caselli, Munan Gong, Kedron Silsbee   +4 more
doaj   +1 more source

SpS1-Circumstellar disks & their evolution: Dust

, 2009
Circumstellar disks are an intrinsic part of star formation and are also where planets form, migrate, and where the materials capable of producing life-bearing worlds are produced.
Carol A. Grady
core   +1 more source

Characterizing the dynamical magnetosphere of the extremely slowly rotating magnetic O9.7 V star HD 54879 using rotational modulation of the Hα profile

Astronomische Nachrichten, Volume 345, Issue 4, May 2024.
Abstract The magnetic field in the O9.7 V star HD 54879 has been monitored for almost a decade. Spectropolarimetric observations reveal a rather strong mean longitudinal magnetic field that varies with a period of about 7.41 years. Observations in the Hα$$ \alpha $$ line show a variation with the same period, while the Hβ$$ \beta $$ line shows only ...
Manfred Küker, S. P. Järvinen, S. Hubrig, Ilya Ilyin, M. Schöller   +4 more
wiley   +1 more source

JWST-TST High Contrast: Asymmetries, Dust Populations, and Hints of a Collision in the β Pictoris Disk with NIRCam and MIRI

The Astronomical Journal
We present the first JWST Mid-Infrared Instrument (MIRI) and Near Infrared Camera (NIRCam) observations of the prominent debris disk around β Pictoris.
Isabel Rebollido, Christopher C. Stark, Jens Kammerer, Marshall D. Perrin, Kellen Lawson, Laurent Pueyo, Christine Chen, Dean Hines, Julien H. Girard, Kadin Worthen, Carl Ingerbretsen, Sarah Betti, Mark Clampin, David Golimowski, Kielan Hoch, Nikole K. Lewis, Cicero X. Lu, Roeland P. van der Marel, Emily Rickman, Sara Seager, Rémi Soummer, Jeff A. Valenti, Kimberly Ward-Duong, C. Matt Mountain   +23 more
doaj   +1 more source

Discovery and Classification of New Circumstellar Disks from the AllWISE Catalog with Disk Detective

, 2019
In its five years since launch, DiskDetective.org has led to many new discoveries in the field of circumstellar disks. In my dissertation, I present two major emphases of the project: statistical characterization of infrared excess sources from AllWISE ...
Silverberg, Steven
core  

Circumstellar Disks in the Orion Nebula Cluster [PDF]

, 1998
We combine our previous optical spectroscopic and photometric analysis of ~1600 stars located in the Orion Nebula Cluster (ONC) with our own and published near-infrared photometric surveys of the region in order to investigate the evidence for and ...
Gatley, Ian, Skrutskie, Michael F., Hillenbrand, Lynne A., Strom, Stephen E., Meyer, Michael R., Makidon, Russell B., Merrill, K. Michael, Calvet, Nuria   +7 more
core  

Size distribution of circumstellar disks in the Trapezium cluster

, 2005
In this paper we present results on the size distribution of circumstellar disks in the Trapezium ...
J. Alves, S. M. Vicente
core   +1 more source