X-Ray Flares of Sun-Like Young Stellar Objects and Their Effects on Protoplanetary Disks

Astrophysics, abstract
astro-ph/0505562

From: Alfred Glassgold [view email]

Date (v1): Fri, 27 May 2005 17:12:52 GMT   (830kb)

Date (revised v2): Mon, 13 Jun 2005 17:09:30 GMT   (830kb)

Astronomical observations of flares from analogs of the early Sun have the
potential to give critical insights into the high energy irradiation
environment of protoplanetary disks. Solar-mass young stellar objects are
significantly more X-ray luminous than the typical low-mass T Tauri star. They
undergo frequent strong flaring on a several day time scale. Very powerful
flares also occur, but on a longer time frame. The hard X-ray spectrum of these
stars become even harder during flaring. The X-rays from these sun-like young
stellar objects have the potential to ionize circumstellar material out to
large distances. Three specific illustrations are given of the effects of the
X-rays: The physics and chemistry of the atmospheres of the inner accretion
disks; the ionization level at the disk midplane, important for the viability
of the magnetorotational instability; and the nuclear fluence in the
irradiation zone just interior to the inner edge of the disk, important in
local irradiation scenarios for producing the short-lived radionuclides found
in meteorites.

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