On the ionisation fraction in protoplanetary disks
نویسندگان
چکیده
منابع مشابه
On the Ionisation Fraction in Protoplanetary Disks I: Comparing Different Reaction Networks
We calculate the ionisation fraction in protostellar disk models using a number of different chemical reaction networks, including gas–phase and gas–grain reaction schemes. The disk models we consider are conventional α–disks, which include viscous heating and radiative cooling. The primary source of ionisation is assumed to be X–ray irradiation from the central star. For most calculations we a...
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Context. Recent observations of the X–ray emission from T Tauri stars in the Orion nebula have shown that they undergo frequent outbursts in their X–ray luminosity. These X–ray flares are characterised by increases in luminosity by two orders of magnitude, a typical duration of less than one day, and a significant hardening of the X–ray spectrum. Aims. It is unknown what effect these X–ray flar...
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We calculate the ionisation fraction in protostellar disk models using two different gas–phase chemical networks, and examine the effect of turbulent mixing by modelling the diffusion of chemical species vertically through the disk. The aim is to determine in which regions of the disk gas can couple to a magnetic field and sustain MHD turbulence. The disk models are conventional α–disks, and th...
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This paper considers the chemistry in a protoplanetary accretion disk during the viscous stage. The model calculation extends our previous work by including in the chemical reaction network the ionisation processes due to cosmic rays and especially the ionisation due to the extinct radio-nuclides 26Al and 60Fe which are known to have been present at the time of formation of our own solar system...
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3 Material Inventory and Fundamental Chemical Processes in Disks 14 3.1 Inventory of Gas-Phase Molecules . . . . . . . . . . . . . . . . . . . . . . . . . . 14 3.1.1 Results from (Sub-)millimeter Spectroscopy . . . . . . . . . . . . . . . . . 15 3.1.2 Results from Far-Infrared Spectroscopy . . . . . . . . . . . . . . . . . . . 17 3.1.3 Results from Midand Near-Infrared Spectroscopy . . . . . . ...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2005
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361:20053678