Results 41 to 50 of about 7,097 (207)

Magnetospherically Mediated Accretion in Classical T Tauri Stars [PDF]

Symposium - International Astronomical Union, 1997
Observational evidence suggests that disk accretion in low mass stars is mediated by the stellar magnetosphere in the inner few stellar radii of a star/accretion disk system. A strong stellar field appears to disrupt the inner disk and channel accreting material in a funnel flow toward the stellar surface.
openaire   +2 more sources

Oscillations of the Boundary Layer and High-frequency QPOs

EPJ Web of Conferences, 2014
We observed persistent high-frequency oscillations of the boundary layer near an accreting, weakly-magnetized star in global 3D MHD simulations. The tilted dipole magnetic field is not strong enough to open a gap between the star and the disk.
Blinova A. A., Bachetti M., Romanova M. M.   +2 more
doaj   +1 more source

CO Rovibrational Emission as a Probe of Inner Disk Structure [PDF]

, 2011
We present an analysis of CO emission lines from a sample of T Tauri, Herbig Ae/Be, and transitional disks with known inclinations in order to study the structure of inner disk molecular gas.
Blake, G. A., Boogert, A. C. A., Brown, J. M., Salyk, C.   +3 more
core   +3 more sources

Magnetospheric Accretion in Classical T Tauri Stars

, 2006
The inner 0.1 AU around accreting T Tauri stars hold clues to many physical processes that characterize the early evolution of solar-type stars. The accretion-ejection connection takes place at least in part in this compact magnetized region around the central star, with the inner disk edge interacting with the star's magnetosphere thus leading ...
Bouvier, J., Alencar, S. H. P., Harries, T. J., Johns-Krull, C. M., Romanova, M. M.   +4 more
openaire   +2 more sources

Calcium II infrared triplet line models in classical T Tauri stars [PDF]

Astronomy & Astrophysics, 2006
We study the formation of the calcium II infrared triplet lines 8498 , 8542 and 8662 , in the accreting magnetospheric flows of Classical T Tauri stars (CTTS), and present a grid of models for a large range of magnetospheric conditions. We apply our models to the interpretation of multi epoch observations of the CTTS DI Cep. We find that these lines
Azevedo, R., Calvet, N., Hartmann, L., Folha, D., Gameiro, F., Muzerolle, J.   +5 more
openaire   +2 more sources

Twenty-five Years of Accretion onto the Classical T Tauri Star TW Hya

The Astrophysical Journal, 2023
Accretion plays a central role in the physics that governs the evolution and dispersal of protoplanetary disks. The primary goal of this paper is to analyze the stability over time of the mass accretion rate onto TW Hya, the nearest accreting solar-mass ...
Gregory J. Herczeg, Yuguang Chen, Jean-Francois Donati, Andrea K. Dupree, Frederick M. Walter, Lynne A. Hillenbrand, Christopher M. Johns-Krull, Carlo F. Manara, Hans Moritz Günther, Min Fang, P. Christian Schneider, Jeff A. Valenti, Silvia H. P. Alencar, Laura Venuti, Juan Manuel Alcalá, Antonio Frasca, Nicole Arulanantham, Jeffrey L. Linsky, Jerome Bouvier, Nancy S. Brickhouse, Nuria Calvet, Catherine C. Espaillat, Justyn Campbell-White, John M. Carpenter, Seok-Jun Chang, Kelle L. Cruz, S. E. Dahm, Jochen Eislöffel, Suzan Edwards, William J. Fischer, Zhen Guo, Thomas Henning, Tao Ji, Jessy Jose, Joel H. Kastner, Ralf Launhardt, David A. Principe, Connor E. Robinson, Javier Serna, Michal Siwak, Michael F. Sterzik, Shinsuke Takasao   +41 more
doaj   +1 more source

Very Low Mass Stars and Brown Dwarfs in Taurus-Auriga

, 2002
We present high resolution optical spectra obtained with the HIRES spectrograph on the Keck I telescope of low mass T Tauri stars and brown dwarfs (LMTTs) in Taurus-Auriga.
Baraffe I., Bertout C., Bouvier J., Chabrier G., Delfosse X., Gibor Basri, Herbig G. H., Hessman F. V., Jevremovic D., Magazzu A., Russel J. White, Siess L., Sterzik M. F.   +12 more
core   +1 more source

Modeling the Halpha line emission around classical T Tauri stars using magnetospheric accretion and disk wind models [PDF]

, 2010
Spectral observations of classical T Tauri stars show a wide range of line profiles, many of which reveal signs of matter inflow and outflow. Halpha is the most commonly observed line profile due to its intensity, and it is highly dependent on the ...
Alencar, Alencar, Anderson, Appenzeller, Bacciotti, Blandford, Bouvier, Burrows, Cabrit, Cai, Calvet, Casse, Edwards, Ferreira, Finkenzeller, G. H. R. A. Lima, Ghosh, Gullbring, Gullbring, Hartigan, Hartmann, Hartmann, J. Muzerolle, Johns-Krull, Johns-Krull, Koenigl, Kurosawa, L. Hartmann, Martin, Mestel, Murphy, Muzerolle, Muzerolle, Muzerolle, Muzerolle, Muzerolle, N. Calvet, Pelletier, Pesenti, Pudritz, Pudritz, Reipurth, Romanova, Rybicki, S. H. P. Alencar, Safier, Shu, Symington, Takami, Vernazza, Zanni   +50 more
core   +1 more source

A Comprehensive Analysis of Rovibrational CO in the Era of JWST

The Astronomical Journal
We present an analysis of CO rovibrational emission lines in the 183 infrared spectra of nearby Class II objects obtained with the NIRSPEC instrument on the Keck II telescope over the past two decades.
D. Annie Dickson-Vandervelde, Colette Salyk, Geoffrey A. Blake, Clara Ross, Adwin Boogert, Klaus Pontoppidan   +5 more
doaj   +1 more source

The Comprehensive Archive of Substellar and Planetary Accretion Rates

The Astronomical Journal, 2023
Accretion rates ( $\dot{M}$ ) of young stars show a strong correlation with object mass ( M ); however, extension of the $\dot{M}\mbox{--}M$ relation into the substellar regime is less certain. Here, we present the Comprehensive Archive of Substellar and
S. K. Betti, K. B. Follette, K. Ward-Duong, A. E. Peck, Y. Aoyama, J. Bary, B. Dacus, S. Edwards, G.-D. Marleau, K. Mohamed, J. Palmo, C. Plunkett, C. Robinson, H. Wang   +13 more
doaj   +1 more source