A New FU Orionis Accretion Outburst in the W5 H ii Region

Lynne A. Hillenbrand; Matthew J. Graham; Mansi M. Kasliwal; Josiah Purdum; Jesper Sollerman; Adolfo S. Carvalho; Michael A. Kuhn; Roger Smith; Michael C. B. Ashley; Nicholas Earley; Russ R. Laher; Tracy X. Chen

doi:10.3847/2515-5172/ae226e

A New FU Orionis Accretion Outburst in the W5 H ii Region

Lynne A. Hillenbrand
, Matthew J. Graham
, Mansi M. Kasliwal
, Josiah Purdum
, Jesper Sollerman
, Adolfo S. Carvalho
, Michael A. Kuhn
, Roger Smith
, Michael C. B. Ashley
, Nicholas Earley
, Russ R. Laher
, Tracy X. Chen

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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.

Original language	English
Number of pages	3
Journal	Research Notes of the American Astronomical Society
Volume	9
Issue number	11
Early online date	25 Nov 2025
DOIs	https://doi.org/10.3847/2515-5172/ae226e
Publication status	Published - 25 Nov 2025

Keywords

FU Orionis stars
Young stellar objects

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10.3847/2515-5172/ae226eLicence: CC BY

Final_Version
© 2025 The Author(s). This is an open access article distributed under the Creative Commons Attribution License, to view a copy of the license, see: https://creativecommons.org/licenses/by/4.0/
Final published version, 859 KBLicence: CC BY

Cite this

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title = "A New FU Orionis Accretion Outburst in the W5 H ii Region",

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.",

keywords = "FU Orionis stars, Young stellar objects",

author = "Hillenbrand, \{Lynne A.\} and Graham, \{Matthew J.\} and Kasliwal, \{Mansi M.\} and Josiah Purdum and Jesper Sollerman and Carvalho, \{Adolfo S.\} and Kuhn, \{Michael A.\} and Roger Smith and Ashley, \{Michael C. B.\} and Nicholas Earley and Laher, \{Russ R.\} and Chen, \{Tracy X.\}",

note = "{\textcopyright}2025 The Author(s). This is an open access article distributed under the Creative Commons Attribution License, to view a copy of the license, see: https://creativecommons.org/licenses/by/4.0/ ",

year = "2025",

month = nov,

day = "25",

doi = "10.3847/2515-5172/ae226e",

language = "English",

volume = "9",

journal = "Research Notes of the American Astronomical Society ",

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TY - JOUR

T1 - A New FU Orionis Accretion Outburst in the W5 H ii Region

AU - Hillenbrand, Lynne A.

AU - Graham, Matthew J.

AU - Kasliwal, Mansi M.

AU - Purdum, Josiah

AU - Sollerman, Jesper

AU - Carvalho, Adolfo S.

AU - Kuhn, Michael A.

AU - Smith, Roger

AU - Ashley, Michael C. B.

AU - Earley, Nicholas

AU - Laher, Russ R.

AU - Chen, Tracy X.

PY - 2025/11/25

Y1 - 2025/11/25

N2 - 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.

AB - 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.

KW - FU Orionis stars

KW - Young stellar objects

U2 - 10.3847/2515-5172/ae226e

DO - 10.3847/2515-5172/ae226e

M3 - Article

SN - 2515-5172

VL - 9

JO - Research Notes of the American Astronomical Society

JF - Research Notes of the American Astronomical Society

IS - 11

ER -

A New FU Orionis Accretion Outburst in the W5 H ii Region

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Keywords

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