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PreprintCC BY-NC-SA 4.0arXiv

Secular Evolution of Quasiperiodic Eruptions: eRO-QPE2

  • Zirui Zhang
  • Cong Zhou
  • Zhen Pan
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Abstract

Quasi-periodic eruptions (QPEs) are recurrent soft X-ray flares from galactic nuclei. In this work, we analyze both the quiescent and eruption emission of eRO-QPE2, using 11 XMM-Newton observations spanning 4.33 yr. The key findings include (1) the eruption peak count rate remains approximately constant, while the quiescent count rate shows an approximately linear decline superposed with a large-amplitude oscillation; (2) no secondary eruptions are detected between the normal eruptions and any such events would have to be fainter by more than two orders of magnitude; (3) the recurrence time decreases at an average rate of Ṫrec≈−5×10−6. These findings are consistent with an extreme mass-ratio inspiral (EMRI) interacting with a precessing accretion disk and producing two normal eruptions per orbital period. Bayesian timing analyses further constrain the EMRI orbital eccentricity to e<0.033 (at 95% confidence level).

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Cite

BibTeXRIS
BibTeX
@misc{zhang2026secular,
  title = {{Secular Evolution of Quasiperiodic Eruptions: eRO-QPE2}},
  author = {Zirui Zhang and Cong Zhou and Zhen Pan},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.21844},
  eprint = {2610.21844},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.21844},
  note = {CC BY-NC-SA 4.0},
}
RIS
TY  - UNPB
TI  - Secular Evolution of Quasiperiodic Eruptions: eRO-QPE2
AU  - Zirui Zhang
AU  - Cong Zhou
AU  - Zhen Pan
PY  - 2026
DA  - 2026/10/15
PB  - arXiv
DO  - 10.48550/arxiv.2610.21844
UR  - https://arxiv.org/abs/2610.21844
AB  - Quasi-periodic eruptions (QPEs) are recurrent soft X-ray flares from galactic nuclei. In this work, we analyze both the quiescent and eruption emission of eRO-QPE2, using 11 XMM-Newton observations spanning 4.33 yr. The key findings include (1) the eruption peak count rate remains approximately constant, while the quiescent count rate shows an approximately linear decline superposed with a large-amplitude oscillation; (2) no secondary eruptions are detected between the normal eruptions and any such events would have to be fainter by more than two orders of magnitude; (3) the recurrence time decreases at an average rate of Ṫ_rec≈−5×10^−6. These findings are consistent with an extreme mass-ratio inspiral (EMRI) interacting with a precessing accretion disk and producing two normal eruptions per orbital period. Bayesian timing analyses further constrain the EMRI orbital eccentricity to e<0.033 (at 95% confidence level).
ER  -