A Spitzer study of the extreme outburst of EX Lup

Details A Spitzer study of the extreme outburst of EX Lup A Spitzer study of the extreme outburst of EX Lup

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sptz.prop..477a&link_type=abstract

Spitzer Proposal ID #477

Computer Science

Scientific paper

EX Lupi is the prototype of EXors, a class of pre-main sequence eruptive variables defined by their unpredictable brightenings which typically last several months. Since 2008 January EX Lup is unusually bright and apparently entered a new outburst period. It reached an extreme peak brightness of 8 mag, brighter than at any time before. We propose to observe EX Lup during its most extreme eruption with the Spitzer Space Telescope, in order tomeasure the 3.6-70 micrometer spectral energy distribution and perform mid-infrared spectroscopy. Using the new Spitzer data we will compare the quiescent and outburst states by analysing the wavelength-dependence of the outburst and interpret the results in terms of disk temperature/density structure. We will also analyse the silicate spectral features in order to look for the formation of crystalline silicates, never seen in young eruptive stars before. We request 1.4 h observing time for this program.

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