Results 91 to 100 of about 17,073 (217)

Observations of Circumstellar Disks

, 2001
Review article to appear in "The 4th Tetons Summer School Conference: "Galactic Structure, Stars, and the Interstellar Medium," ed. C.W. Woodward, M. . Bicay, & J.M. Schull (San Francisco: ASP), 23 page LaTeX file with 7 low-resolution figures. For postscript version with embedded high-resolution figures, retrieve from http://www.hep.upenn.edu/PORG/
openaire   +2 more sources

Irradiated Disks May Settle into Staircases

The Astrophysical Journal
Much of a protoplanetary disk is thermally controlled by irradiation from the central star. Such a disk, long thought to have a smoothly flaring shape, is unstable due to the so-called irradiation instability .
Taylor Kutra, Yanqin Wu, Yoram Lithwick
doaj   +1 more source

Molecules in the transition disk orbiting T Cha

, 2013
We seek to establish the presence and properties of gas in the circumstellar disk orbiting T Cha, a nearby (d~110 pc), relatively evolved (age ~5-7 Myr) yet actively accreting 1.5 Msun T Tauri star.
Forveille, T., Hily-Blant, P., Kastner, J. H., Montez Jr., R., Principe, D., Sacco, G. G., Zuckerman, B.   +6 more
core   +1 more source

Particle emissivity in circumstellar disks

The Astrophysical Journal, 1991
Submillimeter continuum observations of 29 pre-main-sequence objects in Taurus and Orion are used to study the wavelength dependence of particle emission. These objects are mostly T Tauri stars whose long-wavelength emission is thought to originate in circumstellar disks.
Steven V. W. Beckwith, Anneila I. Sargent   +1 more
openaire   +1 more source

Dual-band Observations of the Asymmetric Ring around CIDA 9A: Dead or Alive?

The Astrophysical Journal
While the most exciting explanation of the observed dust asymmetries in protoplanetary disks is the presence of protoplanets, other mechanisms can also form the dust features.
Daniel Harsono, Feng Long, Paola Pinilla, Alessia A. Rota, Carlo F. Manara, Gregory J. Herczeg, Doug Johnstone, Giovanni Rosotti, Giuseppe Lodato, Francois Menard, Marco Tazzari, Yangfan Shi   +11 more
doaj   +1 more source

Dust distribution in circumstellar disks harboring multi-planet systems

Astronomy & Astrophysics
Context. Theoretical formation models and exoplanet detection surveys indicate that systems with multiple giant planets are common. Aims. We investigate how multiple super-thermal-mass planets embedded in a circumstellar disk shape the dust distribution ...
Roatti V., Picogna G., Marzari F.
doaj   +1 more source

Dynamics of Circumstellar Disks III: The case of GG Tau A

, 2016
(abridged) We present 2-dimensional hydrodynamic simulations using the Smoothed Particle Hydrodynamic (SPH) code, VINE, to model a self-gravitating binary system similar to the GG Tau A system.
Marzari, F., Nelson, Andrew F.
core   +1 more source

Imaging Circumstellar Debris Disks

, 1998
4 pages, includes one color PostScript figure, to appear in Proceedings of the Vatican Observatory Symposium on Astrophysics Research and Science ...
openaire   +2 more sources

The Warped Circumstellar Disk of HD 100546

The Astrophysical Journal, 2006
We propose that the two armed spiral features seen in visible Hubble Space Telescope images of scattered light in HD100546's circumstellar disk are caused by the illumination of a warped outer disk. A tilt of 6-15 degrees from the symmetry plane can cause the observed surface brightness variations providing the disk is very twisted (highly warped) at ...
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Dust in circumstellar disks

, 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.
openaire   +2 more sources