Physics
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011sptz.prop80165a&link_type=abstract
Spitzer Proposal ID #80165
Physics
Scientific paper
Most young stars are variable, and not only at optical, but also at infrared wavelengths. Our group had proposed a new method to interpret such light variations using a tomographic technique. It is based on analyzing the time variations of the integrated flux of a shrinking illuminated disk area during the fading. We also suggested that rearrangement in the density structure of the inner disk - mainly due to evaporation/condensation of dust particles in the outburst heat - can be seen in the multicolor light curves. The outbursts of two so-far unknown young eruptive stars in Cygnus in 2010 August offer the long-waited opportunity to perform a proof-of-concept analysis of our proposed methods to investigate disk tomography and dynamics. Here we propose to conduct a multi-epoch survey of two young eruptive star during their outburst with Spitzer/IRAC. We will obtain 3.6 and 4.5 um images at 9 epochs, and the data will be supplemented by simultaneous ground-based optical and near-infrared photometry. The flux and color variations of HBC 722 will be interpreted using the new method of disk tomography, while the corresponding data on VSX J205126.1+440523 will be interpreted in terms of the sum of variable illumination and time variable density structure of the inner disk/envelope. Our study may demonstrate that variability, in particular the wavelength dependence of flux variations over the whole infrared domain, provides an extremely powerful ?extra dimension? of information, in addition to space and wavelength.
Ábrahám Peter
Kóspál Ágnes
Moór Attila
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