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Published November 2025 | Version Published
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A New FU Orionis Accretion Outburst in the W5 H II Region

Creators

  • 1. ROR icon California Institute of Technology
  • 2. ROR icon AlbaNova
  • 3. ROR icon Harvard-Smithsonian Center for Astrophysics
  • 4. ROR icon University of Hertfordshire
  • 5. ROR icon UNSW Sydney
  • 6. ROR icon Infrared Processing and Analysis Center

Abstract

We announce a recently detected outburst that is currently only a few months old, and probably of FU Orionis type. The progenitor to the outburst was an emission-line, flat-spectrum spectral energy distribution young stellar object located in the W5 region, though somewhat outside the main star formation action. We present optical, near-infrared, and mid-infrared lightcurves that illustrate the quiescent state of [KAG2008] 13656 and its subsequent Δr ≈ −4 mag and ΔJ ≈ −3 mag outburst over ∼75 days in late-2025. Follow-up optical and near-infrared spectroscopy confirms the expected features from an FU Ori disk and outflow.

Copyright and License

© 2025. The Author(s). Published by the American Astronomical Society. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.

This AAS-Provided PDF is © 2025 The Author(s). Published by the American Astronomical Society.

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Additional details

Related works

Is new version of
Discussion Paper: arXiv:2511.17884 (arXiv)

Dates

Submitted
2025-11-18
Available
2025-11-25
Published online

Caltech Custom Metadata

Caltech groups
Astronomy Department, Infrared Processing and Analysis Center (IPAC), Division of Physics, Mathematics and Astronomy (PMA)
Publication Status
Published