Aarmed with Data: Bumps, Outflows, and Disk-like Emission in TDE 2025aarm

@misc{aamer2026aarmed,
  title = {{Aarmed with Data: Bumps, Outflows, and Disk-like Emission in TDE 2025aarm}},
  author = {Aysha Aamer and Kate D. Alexander and Charlotte R. Angus and Panos Charalampopoulos and Megan Newsome and Iair Arcavi and Giorgos Leloudas and Matt Nicholl and Jennifer Andrews and Katie Auchettl and Thomas de Boer and K. Azalee Bostroem and Y. -Z. Cai and Kenneth C. Chambers and Collin T. Christy and Sara Faris and Noah Franz and Sebastian Gomez and Maider González-Bañuelos and Mariusz Gromadzki and Paul J. Groot and Claudia Gutiérrez and Brian Hsu and Mark Huber and Thomas L. Killestein and Chien-Cheng Lin and Thomas B. Lowe and Peter Lundqvist and Dylan Magill and Seppo Mattila and Francesca Onori and Gregory S. H. Paek and Jeniveve Pearson and Miika Pursiainen and Niko Pyykkinen and Conor Ransome and Sara Romagnoli and Jennifer Shi and Manisha Shrestha and Nathan Smith and Maximilian Stritzinger and Bhagya Subrayan and Richard Wainscoat and Ziyang Y. Wang and Simon de Wet and Hannah Wichern},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.09725},
  eprint = {2609.09725},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.09725},
  note = {CC BY 4.0},
}

TY  - UNPB
TI  - Aarmed with Data: Bumps, Outflows, and Disk-like Emission in TDE 2025aarm
AU  - Aysha Aamer
AU  - Kate D. Alexander
AU  - Charlotte R. Angus
AU  - Panos Charalampopoulos
AU  - Megan Newsome
AU  - Iair Arcavi
AU  - Giorgos Leloudas
AU  - Matt Nicholl
AU  - Jennifer Andrews
AU  - Katie Auchettl
AU  - Thomas de Boer
AU  - K. Azalee Bostroem
AU  - Y. -Z. Cai
AU  - Kenneth C. Chambers
AU  - Collin T. Christy
AU  - Sara Faris
AU  - Noah Franz
AU  - Sebastian Gomez
AU  - Maider González-Bañuelos
AU  - Mariusz Gromadzki
AU  - Paul J. Groot
AU  - Claudia Gutiérrez
AU  - Brian Hsu
AU  - Mark Huber
AU  - Thomas L. Killestein
AU  - Chien-Cheng Lin
AU  - Thomas B. Lowe
AU  - Peter Lundqvist
AU  - Dylan Magill
AU  - Seppo Mattila
AU  - Francesca Onori
AU  - Gregory S. H. Paek
AU  - Jeniveve Pearson
AU  - Miika Pursiainen
AU  - Niko Pyykkinen
AU  - Conor Ransome
AU  - Sara Romagnoli
AU  - Jennifer Shi
AU  - Manisha Shrestha
AU  - Nathan Smith
AU  - Maximilian Stritzinger
AU  - Bhagya Subrayan
AU  - Richard Wainscoat
AU  - Ziyang Y. Wang
AU  - Simon de Wet
AU  - Hannah Wichern
PY  - 2026
DA  - 2026/09/17
PB  - arXiv
DO  - 10.48550/arxiv.2609.09725
UR  - https://arxiv.org/abs/2609.09725
AB  - The origin of the optical emission in tidal disruption events (TDEs) remains one of the major outstanding questions in the field, in part due to the limited number of nearby events with high-cadence monitoring to track their evolving photometric and spectroscopic properties. We present multi-wavelength observations of the nearby (z=0.01368) TDE\,2025aarm, including near-daily spectroscopic coverage prior to the optical peak. Its proximity makes it one of the brightest TDEs discovered, reaching a peak magnitude of m_r∼15.5 (M_r∼−18). The light curve deviates from a smooth evolution, exhibiting multiple rebrightening episodes visible in both the individual filter light curves and the bolometric luminosity. Blackbody modelling reveals that these rebrightenings are associated with an increase in temperature of > 5,000−10,000\,K, while the inferred photospheric radius remains approximately constant. Simultaneously, the Hα line not only increases in blueshift but also broadens, suggesting a link between the continuum rebrightenings to changes in the kinematics of the line-forming gas. We identify a persistent absorption component at ∼−3900\,km\,s^−1 in multiple Balmer lines, providing further evidence for outflowing material. The Hα profile also exhibits excess flux compared to a Gaussian on both sides of the line, inconsistent with simple scattering-dominated outflow models. Disk-profile modelling provides evidence for the emergence of a disk-like component least ∼20 days after peak, with substantial changes in the disk properties between ∼50 and 60 days. These observations highlight the complexity of TDE emission processes and demonstrate how dense multi-wavelength monitoring can disentangle the roles of accretion, reprocessing, and outflows in shaping TDE emission.
ER  -