The FU Ori Outburst of PR Ori B

@article{pena2026outburst,
  title = {{The FU Ori Outburst of PR Ori B}},
  author = {Carlos Contreras Peña and Zsófia Nagy and Gregory 雷歌 Herczeg 沈 and Jeong-Eun 정은 Lee 이 and Ágnes Kóspál and Péter Ábrahám and Doug Johnstone and Bo Reipurth and Chul-Hwan 철환 Kim 김 and Hyun-Il 현일 Sung 성 and Yihan Li and Jiaze Wang and Rui Wu and Foteini Lykou and Mizna Ashraf and John Bally and Fernando Cruz-Saénz de Miera and Min Fang and Eleonora Fiorellino and Christoffer Fremling and Teresa Giannini and Jessy Jose and Mansi Kasliwal and Mária Kun and Ho-Gyu 호규 Lee 이 and Michal Siwak and Máté Szilágyi and Sung-Yong 성용 Yoon 윤 and Zsófia Bora and Borbála Cseh and Ágoston Horti-Dávid and Zsóka Horváth and András Peter Joó and Csilla Kalup and Klára Lelkes and András Pál and Zsolt Regály and Krisztián Sárneczky and Bálint Seli and Ádám Sódor and Norton O. Szabó and Zsófia Szabó and Róbert Szakáts and Nóra Takács and Miguel Vioque},
  journal = {The Astrophysical Journal},
  year = {2026},
  month = oct,
  doi = {10.3847/1538-4357/aea56e},
  url = {https://iopscience.iop.org/article/10.3847/1538-4357/aea56e},
  note = {CC BY 4.0},
}

TY  - JOUR
TI  - The FU Ori Outburst of PR Ori B
AU  - Carlos Contreras Peña
AU  - Zsófia Nagy
AU  - Gregory 雷歌 Herczeg 沈
AU  - Jeong-Eun 정은 Lee 이
AU  - Ágnes Kóspál
AU  - Péter Ábrahám
AU  - Doug Johnstone
AU  - Bo Reipurth
AU  - Chul-Hwan 철환 Kim 김
AU  - Hyun-Il 현일 Sung 성
AU  - Yihan Li
AU  - Jiaze Wang
AU  - Rui Wu
AU  - Foteini Lykou
AU  - Mizna Ashraf
AU  - John Bally
AU  - Fernando Cruz-Saénz de Miera
AU  - Min Fang
AU  - Eleonora Fiorellino
AU  - Christoffer Fremling
AU  - Teresa Giannini
AU  - Jessy Jose
AU  - Mansi Kasliwal
AU  - Mária Kun
AU  - Ho-Gyu 호규 Lee 이
AU  - Michal Siwak
AU  - Máté Szilágyi
AU  - Sung-Yong 성용 Yoon 윤
AU  - Zsófia Bora
AU  - Borbála Cseh
AU  - Ágoston Horti-Dávid
AU  - Zsóka Horváth
AU  - András Peter Joó
AU  - Csilla Kalup
AU  - Klára Lelkes
AU  - András Pál
AU  - Zsolt Regály
AU  - Krisztián Sárneczky
AU  - Bálint Seli
AU  - Ádám Sódor
AU  - Norton O. Szabó
AU  - Zsófia Szabó
AU  - Róbert Szakáts
AU  - Nóra Takács
AU  - Miguel Vioque
PY  - 2026
DA  - 2026/10/19
JO  - The Astrophysical Journal
DO  - 10.3847/1538-4357/aea56e
UR  - https://iopscience.iop.org/article/10.3847/1538-4357/aea56e
AB  - We report the discovery of a nearby FU Ori–type outburst (FUor), PR Ori B, in the L1641 cluster of the Orion star-forming region. The high-amplitude variability was first identified in the NEOWISE (3–5 μ m) photometry of the unresolved PR Ori binary system. Long-term, resolved optical photometric monitoring demonstrates that PR Ori B is the driver of a Δ G = 5 mag outburst, while PR Ori A has remained constant over the past 20 yr. The near-IR spectrum of PR Ori B changes from a late K-type spectral type during quiescence to a viscously heated disk during outburst, including deep absorption in ¹² CO and H ₂ O bands. The optical spectrum also exhibits features that are commonly associated with FUors, including P Cygni profiles in Na i D lines and absorption in the Ca ii infrared triplet. The luminosity of the outburst ( L acc ∼ 30–40 L ⊙ ) is similar to that commonly observed in FUors. The comparison of Spitzer/Infrared Spectrograph and Very Large Telescope/VISIR spectroscopy shows some evidence of silicate crystallization during the outburst. PR Ori B is one of the closest and brightest FUors discovered over the past few years, only one magnitude fainter than the archetype of the class FU Ori. The proximity and brightness will allow for future high angular resolution observations to probe the physics of the inner disk and to evaluate changes in the disk due to the increased luminosity.
SN  - 0004-637X
SN  - 1538-4357
ER  -