Results 61 to 70 of about 2,119 (235)

Wavelength-dependent Extinction and Grain Sizes in “Dippers”

The Astronomical Journal, 2023
We have examined internight variability of K2-discovered “dippers” that are not close to being viewed edge-on, as determined from previously reported ALMA images, using the SpeX spectrograph on NASA’s Infrared Telescope Facility.
Michael L. Sitko, Ray W. Russell, Zachary C. Long, Korash Assani, Monika Pikhartova, Ammar Bayyari, Carol A. Grady, Carey M. Lisse, Massimo Marengo, John P. Wisniewski, William C. Danchi   +10 more
doaj   +1 more source

FAR-ULTRAVIOLET H ₂ EMISSION FROM CIRCUMSTELLAR DISKS [PDF]

The Astrophysical Journal, 2009
15 pages, 4 figures, accepted to ...
Ingleby, Laura, Calvet, Nuria, Bergin, Edwin, Yerasi, Ashwin, Espaillat, Catherine, Herczeg, Gregory, Roueff, Evelyne, Abgrall, Hervé, Hernández, Jesus, Briceño, César, Pascucci, Ilaria, Miller, Jon, Fogel, Jeffrey, Hartmann, Lee, Meyer, Michael, Carpenter, John, Crockett, Nathan, McClure, Melissa   +17 more
openaire   +4 more sources

L1448 IRS3B: Dust Polarization Aligned with Spiral Features, Tracing Gas Flows

The Astrophysical Journal
Circumstellar disk dust polarization in the (sub)millimeter is, for the most part, not from dust grain alignment with magnetic fields but rather indicative of a combination of dust self-scattering with a yet unknown alignment mechanism that is consistent
Leslie W. Looney, Zhe-Yu Daniel Lin, Zhi-Yun Li, John J. Tobin, Martin Radecki, Syzygy Butte, Ian W. Stephens, Manuel Fernández-López, Haifeng Yang, Nickalas K. Reynolds, Patrick Sheehan, Woojin Kwon, Rachel Harrison, Allen North   +13 more
doaj   +1 more source

NGC7538 IRS1 N: Modeling a Circumstellar Maser Disk [PDF]

Astrophysics and Space Science, 2005
To appear in The Proceedings of the 2004 European Workshop: "Dense Molecular Gas around Protostars and in Galatic Nuclei", Eds. Y. Hagiwara, W.A. Baan, H.J.
Pestalozzi, M. R., Elitzur, M., Conway, J., Booth, R.   +3 more
openaire   +2 more sources

Discovery of Volatile Gas in the Giant Impact Disk Around the 150 Myr Old HD 23514

The Astrophysical Journal Letters
We report the discovery of CO _2 gas emission around HD 23514, an F5V star in the ∼150 Myr old Pleiades cluster, hosting one of the rare giant-impact disks with unique mineralogy dominated by silica dust. We show that the dust feature remains stable over
Kate Y. L. Su, Attila Moór, Chengyan Xie, Ilaria Pascucci, George H. Rieke, Ágnes Kóspál, Mark C. Wyatt, Péter Ábrahám, Luca Matrà, Zoe Roumeliotis, D. J. Wilner   +10 more
doaj   +1 more source

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

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

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

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

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