Following the Outburst of V1647 Ori

Details Following the Outburst of V1647 Ori Following the Outburst of V1647 Ori

Sep 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sptz.prop..228m&link_type=abstract

Spitzer Proposal ID #228

Physics

Scientific paper

We propose to obtain follow-up Spitzer observations of V1647 Ori, the outbursting source lighting McNeil's nebula. Our analysis of serendipitous GTO IRAC and MIPS data of this object taken at the peak of the outburst has shown a significant increase of roughly a factor of 15 over pre-outburst levels. We have interpreted this event as an increase in the accretion luminosity of the source. Simple models of an accretion disk plus tenuous envelope can qualitatively explain the observed pre- and post-outburst spectral energy distributions. The accretion activity implied by our results indicate that the outburst may be intermediate between FUor and EXor-type events. Outbursts of either type have never before been followed in the infrared throughout their course. Follow-up observations taken before V1647 Ori fades to its original brightness are critical to understanding the evolution of this phenomenon. Spitzer photometry and spectra will reveal important clues about the structure of the envelope and how it responds to the changing luminosity of the central source, elucidating the role of outbursts in the evolution of young stellar objects.

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