Zobrazeno 1 - 10
of 44
pro vyhledávání: '"Durisen, R H"'
Autor:
Durisen, R. H., Estrada, Paul. R.
Publikováno v:
Icarus, Volume 400, 2023, article id. 115221
The Cassini mission provided key measurements needed to determine the absolute age of Saturn's rings, including the extrinsic micrometeoroid flux at Saturn, the volume fraction of non-icy pollutants in the rings, and the total ring mass. These three
Externí odkaz:
http://arxiv.org/abs/2305.13578
Autor:
Evans, M. G., Ilee, J. D., Hartquist, T. W., Caselli, P., Szucs, L., Purser, S. J. D., Boley, A. C., Durisen, R. H., Rawlings, J. M. C.
Gravitational instabilities (GIs) are most likely a fundamental process during the early stages of protoplanetary disc formation. Recently, there have been detections of spiral features in young, embedded objects that appear consistent with GI-driven
Externí odkaz:
http://arxiv.org/abs/1706.00254
Autor:
Evans, M. G., Ilee, J. D., Boley, A. C., Caselli, P., Durisen, R. H., Hartquist, T. W., Rawlings, J. M. C.
To date, most simulations of the chemistry in protoplanetary discs have used 1+1D or 2D axisymmetric $\alpha$-disc models to determine chemical compositions within young systems. This assumption is inappropriate for non-axisymmetric, gravitationally
Externí odkaz:
http://arxiv.org/abs/1508.00773
Autor:
Douglas, T. A., Caselli, P., Ilee, J. D., Boley, A. C., Hartquist, T. W., Durisen, R. H., Rawlings, J. M. C.
The formation and earliest stages of protoplanetary discs remain poorly constrained by observations. ALMA will soon revolutionise this field. Therefore, it is important to provide predictions which will be valuable for the interpretation of future hi
Externí odkaz:
http://arxiv.org/abs/1305.3777
Until now, axisymmetric, alpha-disc models have been adopted for calculations of the chemical composition of protoplanetary discs. While this approach is reasonable for many discs, it is not appropriate when self-gravity is important. In this case, s
Externí odkaz:
http://arxiv.org/abs/1107.3041
Autor:
Michael, Scott, Durisen, R. H.
We test the effect of assumptions about stellar motion on the behavior of gravitational instabilities in protoplanetary disks around solar-type stars by performing two simulations that are identical in all respects except the treatment of the star. I
Externí odkaz:
http://arxiv.org/abs/1005.3744
Publikováno v:
Astrophys.J.651:517-534,2006
This paper presents a fully three-dimensional radiative hydrodymanics simulation with realistic opacities for a gravitationally unstable 0.07 Msun disk around a 0.5 Msun star. We address the following aspects of disk evolution: the strength of gravit
Externí odkaz:
http://arxiv.org/abs/astro-ph/0607112
Autor:
Boley, A. C., Durisen, R. H.
Publikováno v:
Astrophys.J.641:534-546,2006
In this paper, we describe the nonlinear outcome of spiral shocks in protoplanetary disks. Spiral shocks, for most protoplanetary disk conditions, create a loss of vertical force balance in the post-shock region and result in rapid expansion of the g
Externí odkaz:
http://arxiv.org/abs/astro-ph/0510305
Autor:
Pittard, J. M., Dobson, M. S., Durisen, R. H., Dyson, J. E., Hartquist, T. W., O'Brien, J. T.
We investigate the Mach number dependence of the radiative overstability of shocks. We find that the stability of radiative shocks increases with decreasing Mach number, with the result that M=2 shocks require cooling exponents < -1.2 to be overstabl
Externí odkaz:
http://arxiv.org/abs/astro-ph/0504640
Autor:
Boss, A. P., Durisen, R. H.
Publikováno v:
Astrophys.J. 621 (2005) L137-L140
Chondrules are mm-sized spherules found throughout primitive, chondritic meteorites. Flash heating by a shock front is the leading explanation of their formation. However, identifying a mechanism for creating shock fronts inside the solar nebula has
Externí odkaz:
http://arxiv.org/abs/astro-ph/0501592