The outburst of V1647 orionis revealed by spitzer

J. Muzerolle, S. T. Megeath, K. M. Flaherty, K. D. Gordon, G. H. Rieke, E. T. Young, C. J. Lada

Research output: Contribution to journalArticlepeer-review

44 Scopus citations


We present Spitzer Space Telescope observations of V1647 Ori, the outbursting source lighting McNeil's Nebula, taken near the optical peak of the outburst in early March 2004. The source is easily detected in all Spitzer imaging bands from 3.6 to 70 μm. The fluxes at all wavelengths are roughly a factor of 15 brighter than pre-outburst levels; we measure a bolometric luminosity of 44 L. We posit that this event is due to an increase in the accretion luminosity of the source. Simple models of an accretion disk plus a tenuous envelope can qualitatively explain the observed pre- and post-outburst spectral energy distributions. The accretion activity implied by our results indicates that the outburst may be intermediate between FUor- and EXor-type events. We also report the discovery of a previously unknown mid-infrared counterpart to the nearby Herbig-Haro object HH 22.

Original languageEnglish (US)
Pages (from-to)L107-L110
JournalAstrophysical Journal
Issue number2 II
StatePublished - Feb 20 2005


  • Infrared: stars
  • Stars: formation
  • Stars: pre-main-sequence

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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