Results 61 to 70 of about 77,803 (191)

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

Simulations of Multiple Dust Ring Formation in a Subsolar-metallicity Protoplanetary Disk

The Astrophysical Journal
Super-Earths exist around subsolar-metallicity host stars with a frequency comparable to that around solar-metallicity stars, suggesting efficient assembly of dust grains even in metal-deficient environments.
Ryoki Matsukoba, Eduard I. Vorobyov, Takashi Hosokawa   +2 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

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

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

CIRCUMSTELLAR DISKS AROUND BINARY STARS IN TAURUS

The Astrophysical Journal, 2014
We have conducted a survey of 17 wide (> 100 AU) young binary systems in Taurus with the Atacama Large Millimeter Array (ALMA) at two wavelengths. The observations were designed to measure the masses of circumstellar disks in these systems as an aid to understanding the role of multiplicity in star and planet formation.
Akeson, R. L., Jensen, Eric L.N.
openaire   +4 more sources

Multiwavelength Dust Characterization of the HL Tau Disk and Implications for Planet Formation

The Astrophysical Journal
We present a comprehensive analysis of the HL Tau dust disk by modeling its intensity profiles across six wavelengths (0.45–7.9 mm) with a resolution of 0 $\mathop{.}\limits^{^{\prime\prime} }$ 05 (∼7 au). Using a Markov Chain Monte Carlo (MCMC) approach,
Takahiro Ueda, Sean M. Andrews, Carlos Carrasco-González, Osmar M. Guerra-Alvarado, Satoshi Okuzumi, Ryo Tazaki, Akimasa Kataoka   +6 more
doaj   +1 more source

Velocity Structure of Circumstellar Environment around Class 0/I Protostars: Uncertainty in the Protostellar Mass Estimation Using Circumstellar Velocities

The Astrophysical Journal
Recent high-resolution observations have enabled detailed investigations of the circumstellar environments around Class 0/I protostars. Several studies have reported that the infall velocity of the envelope is a few times smaller than the freefall ...
Shingo Hirano, Yuri Aikawa, Masahiro N. Machida   +2 more
doaj   +1 more source

The 12CO gas structures of protoplanetary disks in the Upper Scorpius region

Astronomy & Astrophysics
We present measurements of key protoplanetary disk properties inferred from parametric models of ALMA 12CO spectral line visibilities. We derived gas-disk radii, integrated fluxes, optically thick emission layers, and brightness temperature profiles for ...
Zallio Luigi, Rosotti Giovanni P., Vioque Miguel, Miotello Anna, Andrews Sean M., Manara Carlo F., Carpenter John M., Empey Aaron, Kurtovic Nicolás T., Law Charles J., Longarini Cristiano, Paneque-Carreño Teresa, Teague Richard, Villenave Marion, Yen Hsi-Wei, Zagaria Francesco   +15 more
doaj   +1 more source

Observing CO in Circumstellar Disks [PDF]

, 2010
This dissertation includes high-resolution, near-infrared spectroscopy to study CO in circumstellar disks around Herbig Ae/Be stars. The velocity-resolved spectra was used to measure the distribution of gas in the circumstellar disk and thus determine ...
Troutman, Matthew
core   +1 more source