Rosette Nebula Outburst Gaia 24djk from the Young Stellar Object V557 Mon
Abstract
A previously faint young stellar object (YSO), V557 Mon, rapidly brightened in late 2024 and is currently at least ΔG = 3.3 mag brighter than its typical pre-outburst brightness. The ongoing outburst is identified in the Gaia Alerts system as Gaia24djk. We obtained a 1–2.5 μm spectrum of the object and find the spectrum is dominated by line emission and continuum excess consistent with rapid YSO accretion, similar to the star EX Lup during its outburst state. We speculate that the burst, which has not yet reached its peak brightness, may become an FU Ori outburst, which would be evidenced by the emission spectrum turning into an absorption spectrum.
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.
Software References
Astropy (Astropy Collaboration et al. 2013, 2018, 2022), NumPy (C. R. Harris et al. 2020).
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Additional details
- Caltech groups
- Astronomy Department
- Publication Status
- Published