V1647 Orionis: Reinvigorated Accretion and the Re-Appearance of McNeil's Nebula

Abstract

In late 2003, the young eruptive variable star V1647 Orionis optically brightened by over 5 magnitudes, stayed bright for around 26 months, and then decline to its pre-outburst level. In August 2008 the star was reported to have unexpectedly brightened yet again and we herein present the first detailed observations of this new outburst. Photometrically, the star is now as bright as it ever was following the 2003 eruption. Spectroscopically, a pronounced P Cygni profile is again seen in Halpha with an absorption trough extending to -700 km/s. In the near-infrared, the spectrum now possesses very weak CO overtone bandhead absorption in contrast to the strong bandhead emission seen soon after the 2003 event. Water vapor absorption is also much stronger than previously seen. We discuss the current outburst below and relate it to the earlier event.

6 pages, 3 figures

References in corpus (7)

• Nearby Supernova Factory Observations of SN 2005gj: Another Type Ia Supernova in a Massive Circumstellar Envelope
• IRAS 05436-0007 and the Emergence of McNeil's Nebula
• The Outburst of V1647 Ori Revealed by Spitzer
• Mid-Infrared and Submillimeter Observations of the Illuminating Source of McNeil's Variable Nebula
• Near-Infrared Spectroscopy of McNeil's Nebula Object
• V1647 Orionis: One Year into Quiescence
• The V1647 Ori (IRAS 05436-0007) Protostar and its Environment

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