Results 21 to 30 of about 35,527 (304)

Spitzer spectroscopy of circumstellar disks in the 5 Myr old upper Scorpius OB association [PDF]

, 2009
We present mid-infrared spectra between 5.2 and 38 μm for 26 disk-bearing members of the ~5 Myr old Upper Scorpius OB association obtained with the Infrared Spectrograph (IRS) onboard the Spitzer Space Telescope. We find clear evidence for changes in the
Carpenter, John M., Dahm, S. E.
core   +1 more source

Evidence for Disk Photoevaporation Driven by the Central Star [PDF]

, 2009
The lifetime of isolated protoplanetary disks is thought to be set by the combination of viscous accretion and photoevaporation driven by stellar high-energy photons.
Alcala, Alexander, Azevedo, Bally, Bouwman, Brandner, Brown, Calvet, Calvet, Cox, Currie, Currie, Cutri, Dullemond, Ercolano, Ercolano, Espaillat, Flaccomio, Font, Glassgold, Gorti, Gorti, Guedel, Gullbring, Herczeg, Herczeg, Hernández, Hollenbach, Hollenbach, I. Pascucci, Kessler-Silacci, Krautter, Käufl, Lagage, Lahuis, Luhman, Lundin, M. Sterzik, Mamajek, Meijerink, Muzerolle, Muzerolle, Najita, Natta, Pascucci, Pascucci, Pascucci, Pascucci, Pontoppidan, Roberge, Smith, Sylvester, van den Ancker, Webb, Weintraub, White   +55 more
core   +1 more source

YOUNG STELLAR OBJECTS IN LYNDS 1641: DISKS, ACCRETION, AND STAR FORMATION HISTORY [PDF]

The Astrophysical Journal Supplement Series, 2013
112 pages, 46 figures, 6 tables, accepted by ...
Fang, Min, Kim, Jinyoung Serena, van Boekel, Roy, Sicilia-Aguilar, Aurora, Henning, Thomas, Flaherty, Kevin   +5 more
openaire   +4 more sources

The spectral energy distribution of self-gravitating protostellar disks [PDF]

, 2001
The long wavelength emission of protostellar objects is commonly attributed to a disk of gas and dust around the central protostar. In the first stages of disk accretion or in the case of high mass protostars, the disk mass is likely to be sufficiently ...
Adams, Adams, Bardou, Beckwith, Bell, Bertin, Bertin, Bertin, Burrows, Calvet, Calvet, Cardelli, Cesaroni, Chiang, Dullemond, Duschl, G. Bertin, G. Lodato, Gullbring, Gullbring, Hartigan, Hartmann, Hohl, Hohl, Kenyon, Kenyon, Kenyon, Kenyon, Kenyon, Laughlin, Laughlin, Lay, Lin, Lin, Lynden-Bell, Nelson, Nelson, Pickett, Pickett, Popham, Richling, Ruden, Rydgren, Shakura, Shu, Stapelfeldt, Valenti, Weaver, Wilner, Yorke   +49 more
core   +2 more sources

Magnetohydrodynamic Simulations of Stellar Magnetosphere–Accretion Disk Interaction

The Astrophysical Journal, 1997
The magnetohydrodynamic evolution of the interaction region between the inner edge of an accretion disk and the magnetosphere of the central object is studied by means of time-dependent numerical simulations. The simulations assume the disk is adiabatic, is axisymmetric, has nonzero resistivity, and is initially in Keplerian rotation. The magnetosphere
Kristen A. Miller, James M. Stone
openaire   +1 more source

The Z Camelopardalis-type Star AY Piscium: Stellar and Accretion Disk Parameters

The Astrophysical Journal, 2023
Abstract We present a new study of the Z Cam-type eclipsing cataclysmic variable AY Piscium with the aim of determining the fundamental parameters of the system and the structure of the accretion flow therein. We use time-resolved photometric observations supplemented by spectroscopy in the standstill, to which we applied our light-curve
Jan Kára, Sergey Zharikov, Marek Wolf, Ainash Amantayeva, Gulnur Subebekova, Serik Khokhlov, Aldiyar Agishev, Jaroslav Merc   +7 more
openaire   +3 more sources

Protoplanetary Disk Structures in Ophiuchus II: Extension to Fainter Sources [PDF]

, 2010
We present new results from a significant extension of our previous high angular resolution (0.3" = 40 AU) Submillimeter Array survey of the 880 um continuum emission from dusty circumstellar disks in the ~1 Myr-old Ophiuchus star-forming region.
A. M. Hughes, Andrews, Andrews, Andrews, Andrews, Andrews, Barranco, Barsony, Boley, Boley, Bouvier, Brown, Brown, C. P. Dullemond, Caselli, Chunhua Qi, Ciesla, Cieza, Crida, Cutri, D'Alessio, D. J. Wilner, de Geus, Dib, Durisen, Eisner, Espaillat, Espaillat, Fleming, Furlan, Gorti, Gorti, Gullbring, Gullbring, Hartmann, Herbig, Hillenbrand, Ho, Hughes, Hughes, Hughes, Ida, Isella, Isella, Johns-Krull, Kitamura, Knude, Kokubo, Loinard, Lubow, Luhman, Lynden-Bell, McCabe, Motte, Muzerolle, Muzerolle, Nürnberger, Padgett, Patience, Prato, Raymond, Reipurth, Schaefer, Sean M. Andrews, Shakura, Siess, Weingartner, Wilking, Zhu   +68 more
core   +1 more source

Alignment of Stellar and AGN Accretion Disks from SDSS Data [PDF]

Proceedings of the International Astronomical Union, 2009
Lagos, Padilla & Cora (2009) show that if alignments between the galaxy kinematics and the AGN system were to occur, massive galaxies should host BHs with high spin values, regardless of the detailed physics of the BH. Since the BH spin regulates the mass-to-energy conversion (Marconi et al. 2004) and possibly the existence of radio jets (Sikora et
Claudia del P. Lagos, Nelson D. Padilla, Michael A. Strauss, Lei Hao   +3 more
openaire   +1 more source

Young Stellar Objects, Accretion Disks, and Their Variability with Rubin Observatory LSST

The Astrophysical Journal Supplement Series, 2023
Abstract Vera C. Rubin Observatory, through the Legacy Survey of Space and Time (LSST), will allow us to derive a panchromatic view of variability in young stellar objects (YSOs) across all relevant timescales. Indeed, both short-term variability (on timescales of hours to days) and long-term variability (months to years), predominantly ...
R. Bonito, L. Venuti, S. Ustamujic, P. Yoachim, R. A. Street, L. Prisinzano, P. Hartigan, M. G. Guarcello, K. G. Stassun, T. Giannini, E. D. Feigelson, A. Caratti o Garatti, S. Orlando, W. I. Clarkson, P. McGehee, E. C. Bellm, J. E. Gizis   +16 more
openaire   +4 more sources

High-energy Neutrinos from Stellar Explosions in Active Galactic Nuclei Accretion Disks [PDF]

The Astrophysical Journal Letters, 2021
Abstract Some catastrophic stellar explosions, such as supernovae (SNe), compact binary coalescences, and microtidal disruption events, are believed to be embedded in the accretion disks of active galactic nuclei (AGNs). We show high-energy neutrinos can be produced efficiently through pp interactions between shock-accelerated cosmic ...
Jin-Ping Zhu, Kai Wang, Bing Zhang
openaire   +2 more sources