Zobrazeno 1 - 10
of 142
pro vyhledávání: '"Willacy, K."'
We present a new method for assessing the intrinsic 3D shape of prestellar cores from molecular column densities. We have employed hydrodynamic simulations of contracting, isothermal cores considering three intrinsic geometries: spherical, cylindrica
Externí odkaz:
http://arxiv.org/abs/1602.03187
Autor:
Willacy, K., Alexander, C., Ali-Dib, M., Ceccarelli, C., Charnley, S. B., Doronin, M., Ellinger, Y., Gast, P., Gibb, E., Milam, S. N., Mousis, O., Pauzat, E., Tornow, C., Wirstrom, E. S., Zicler, E
Conditions in the protosolar nebula have left their mark in the composition of cometary volatiles, thought to be some of the most pristine material in the solar system. Cometary compositions represent the end point of processing that began in the par
Externí odkaz:
http://arxiv.org/abs/1507.02328
The ratio of mass and magnetic flux determines the relative importance of magnetic and gravitational forces in the evolution of molecular clouds and their cores. Its measurement is thus central in discriminating between different theories of core for
Externí odkaz:
http://arxiv.org/abs/1408.5895
ABRIDGED: Context: HI and CO large scale surveys of the Milky Way trace the diffuse atomic clouds and the dense shielded regions of molecular hydrogen clouds. However, until recently, we have not had spectrally resolved C+ surveys to characterize the
Externí odkaz:
http://arxiv.org/abs/1312.3320
The influence of turbulent mixing on the chemistry of the interstellar medium has so far received little attention. Previous studies of this effect have suggested that it might play an important role in mixing the various phases of the interstellar m
Externí odkaz:
http://arxiv.org/abs/1102.2698
Autor:
Decin, L., De Beck, E., Brunken, S., Muller, H. S. P., Menten, K. M., Kim, H., Willacy, K., de Koter, A., Wyrowski, F.
Aims: Little information exists on the circumstellar molecular abundance stratifications of many molecules. The aim is to study the circumstellar chemical abundance pattern of 11 molecules and isotopologs ($^{12}$CO, $^{13}$CO, SiS, $^{28}$SiO, $^{29
Externí odkaz:
http://arxiv.org/abs/1004.1914
Autor:
Willacy, K., Woods, P.
We present the results of models of the chemistry, including deuterium, in the inner regions of protostellar disks. We find good agreement with recent gas phase observations of several (non--deuterated) species. We also compare our results with obser
Externí odkaz:
http://arxiv.org/abs/0908.1114
Autor:
Willacy, K.
Publikováno v:
Astrophys.J.660:441-460,2007
We present new models of the deuterium chemistry in protoplanetary disks, including, for the first time, multiply deuterated species. We use these models to explore whether observations in combination with models can give us clues as to which desorpt
Externí odkaz:
http://arxiv.org/abs/astro-ph/0701484
Publikováno v:
Astrophys.J. 644 (2006) 1202-1213
The dynamics and chemistry of protostellar disks are likely to be intricately linked, with dynamical processes altering the chemical composition, and chemistry, in turn, controlling the ionization structure and hence the ability of the magneto-rotati
Externí odkaz:
http://arxiv.org/abs/astro-ph/0603103
Publikováno v:
Astrophys.J.639:1218-1226,2006
The effects of turbulence on the mixing of gases and dust in the outer Solar nebula are examined using 3-D MHD calculations in the shearing-box approximation with vertical stratification. The turbulence is driven by the magneto-rotational instability
Externí odkaz:
http://arxiv.org/abs/astro-ph/0511325