Results 81 to 90 of about 17,073 (217)

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

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

The effects of viscosity on the circumplanetary disks

, 2012
The effects of viscosity on the circumplanetary disks residing in the vicinity of protoplanets are investigated through two-dimensional hydrodynamical simulations with the shearing sheet model.
Bai, Bryden, Canup, D'Angelo, De-Fu Bu, Feng Yuan, Goldreich, Hayashi, Hsien Shang, Ikoma, Ikoma, Kley, Lubow, Machida, Machida, Muto, Quillen, Schubert, Stevenson, Tanigawa, Tanigawa   +20 more
core   +1 more source

The New Class of Dusty DAZ White Dwarfs [PDF]

, 2007
Our mid-infrared survey of 124 white dwarfs with the Spitzer Space Telescope and the IRAC imager has revealed an infrared excess associated with the white dwarf WD 2115-560 naturally explained by circumstellar dust.
Fergal Mullally, Friedjung M., Koester D., Marc J. Kuchner, Mukremin Kilic, Ted von Hippel, Weidemann V., William T. Reach   +7 more
core   +3 more sources

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

Circumbinary Molecular Rings Around Young Stars in Orion

, 2007
We present high angular resolution 1.3 mm continuum, methyl cyanide molecular line, and 7 mm continuum observations made with the Submillimeter Array and the Very Large Array, toward the most highly obscured and southern part of the massive star forming ...
L. A. Zapata, L. F. Rodríguez, P. Schilke, P. T. P. Ho, S. Kurtz, Zapata   +5 more
core   +1 more source

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

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

High-contrast imaging constraints on gas giant planet formation - The Herbig Ae/Be star opportunity

, 2015
Planet formation studies are often focused on solar-type stars, implicitly considering our Sun as reference point. This approach overlooks, however, that Herbig Ae/Be stars are in some sense much better targets to study planet formation processes ...
A. Boccaletti, A. Garufi, A. Garufi, A. Vigan, A.-M. Lagrange, A.-M. Lagrange, A.J. Skemer, A.L. Kraus, A.P. Verhoeff, A.S. Hales, A.W. Howard, B. Acke, B. Biller, B. Macintosh, B.A. Biller, B.P. Bowler, B.R. Oppenheimer, C. Marois, C. Marois, C. Marois, C. Pinte, C. Walsh, C.A. Grady, C.A. Grady, C.A. Grady, D.R. Ardila, D.S. Spiegel, E. Pantin, E.L. Nielsen, F. Fressin, F. Joos, F. Pepe, G. Chauvin, G. Witzel, G.D. Mulders, G.M. Kennedy, H. Avenhaus, H. Avenhaus, H. Canovas, H.M. Schmid, H.M. Schmid, I. Baraffe, J. Bouwman, J. Carson, J. Hashimoto, J. Rameau, J. Rameau, J. Rameau, J. Rameau, J. Tinbergen, J.-L. Beuzit, J.-L. Beuzit, J.A. Johnson, J.A. Johnson, J.A. Johnson, J.A. Johnson, J.C. Augereau, J.E. Pineda, J.M. Brown, J.R. Crepp, J.R. Kuhn, K.B. Follette, K.B. Follette, K.I. Öberg, K.M. Kratter, L.M. Close, L.M. Pérez, M. Fukagawa, M. Janson, M. Juan Ovelar de, M. Lambrechts, M. Min, M. Momose, M. Osorio, M. Reggiani, M.D. Perrin, M.S. Marley, N. Kusakabe, P. Pinilla, P. Pinilla, Q.M. Konopacky, R. Dong, S. Casassus, S. Hinkley, S. Ida, S. Reffert, S.D. Brittain, S.D. Brittain, S.M. Andrews, S.P. Quanz, S.P. Quanz, S.P. Quanz, S.P. Quanz, Sascha P. Quanz, T. Currie, T. Muto, T.J. Rodigas, W.J. Borucki, Z. Zhu, Z. Zhu   +99 more
core   +1 more source