Results 1 to 10 of about 2,036 (233)

Dust in circumstellar disks [PDF]

, 2006
This thesis presents observational and theoretical studies of the size and spatial distribution of dust particles in circumstellar disks. Using millimetre interferometric observations of optically thick disks around T Tauri stars, I provide conclusive evidence for the presence of millimetre- to centimetre-sized dust aggregates.
J. Rodmann
openalex   +3 more sources

Origin of compact exoplanetary systems during disk infall [PDF]

Nature Communications
Exoplanetary systems that contain multiple planets on short-period orbits appear to be prevalent in the current observed exoplanetary population, yet the processes that give rise to such configurations remain poorly understood.
Raluca Rufu, Robin M. Canup
doaj   +2 more sources

Polarization of Circumstellar Debris Disk Light Echoes

The Astronomical Journal
Light echoes of debris disks around active stars can reveal disk structure and composition even when disks are not spatially resolved. Unfortunately, distinguishing reflected light from quiescent starlight and unexpected post-peak flare structure is ...
Austin J. King, Benjamin C. Bromley, Preston W. Harris, Scott J. Kenyon   +3 more
doaj   +3 more sources

Tracing episodic accretion with NOEMA: FU Orionis-type stars and their millimeter environment [PDF]

EPJ Web of Conferences, 2022
The earliest phases of star formation are characterised by intense mass accretion from the circumstellar disk to the central star. One group of lowmass young stellar objects, FU Orionis-type stars (FUors) exhibit accretion rate peaks accompanied by ...
Fehér O., Kóspál Á., de Miera F. Cruz-Saenz, Ábrahám P., Hogerheijde M.R., Brinch Ch., Semenov D.   +6 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

Vortices in Circumstellar Disks [PDF]

The Astrophysical Journal, 1995
Comment: uuencoded compressed PostScript file containing 30 pages. 5 figures available upon request. Submitted to ApJ.
Adams, Fred, Watkins, Richard
openaire   +2 more sources

Dust Disks Around Young Stellar Objects [PDF]

Journal of Astronomy and Space Sciences, 2016
To reproduce the spectral energy distributions (SEDs) of young stellar objects (YSOs), we perform radiative transfer model calculations for the circumstellar dust disks with various shapes and many dust species.
Kyung-Won Suh
doaj   +1 more source

Dynamics of Circumstellar Disks [PDF]

The Astrophysical Journal, 1998
We present a series of 2-dimensional hydrodynamic simulations of massive disks around protostars. We simulate the same physical problem using both a `Piecewise Parabolic Method' (PPM) code and a `Smoothed Particle Hydrodynamic' (SPH) code, and analyze their differences.
Nelson, Andrew F., Benz, Willy, Adams, Fred C., Arnett, David   +3 more
openaire   +2 more sources

Turbulence in circumstellar disks [PDF]

Astronomy & Astrophysics, 2004
We investigate the analogy between circumstellar disks and the Taylor-Couette flow. Using the Reynolds similarity principle, the analogy results in a number of parameter-free predictions about stability of the disks, and their turbulent transport properties, provided the disk structure is available.
Hersant, Franck, Dubrulle, B., Huré, Jean-Marc   +2 more
openaire   +4 more sources

Azimuthal Patterns in Planetesimal Circumstellar Disks

Astronomy Letters, 2023
24 pages, 8 figures.
Demidova, Tatiana V., Shevchenko, Ivan I.   +1 more
openaire   +2 more sources