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Peer-reviewedCC BY 4.0The Astrophysical Journal Letters

A Recurrent Infrared Modulation in the Warm Postimpact Debris Disk NGC 2547 ID8

  • Xiaodian Chen1,2,3
  • Shu Wang1,3
  • Zhuochao Huang1,4
4 affiliations
  1. 1Chinese Academy of Sciences
  2. 2Beijing Normal University
  3. 3University of Chinese Academy of Sciences
  4. 4Beihang University
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Abstract

Extreme debris disks are signposts of violent rocky collisions, but it remains unclear whether their mid-infrared variability traces transient dust clouds or longer-lived postimpact reservoirs. We analyze a 19 yr mid-infrared record of the young solar analog NGC 2547 ID8, combining four spectra from 2007 to 2024 with 3–5 μ m monitoring through 2026. The optically thin mineral surface remains compositionally stable: broad fits spanning multiple grain sizes give 550–577 K, and a common-basis decomposition with T surf fixed at 560 K is dominated by 1 μ m olivine/Mg-olivine and 0.1 μ m forsterite. The W2-equivalent 4.5 μ m excess, traced across six recurrent high states, is instead driven mainly by changes in the hot-base continuum component and defines a 956.8 days infrared recurrence timescale with cycle-to-cycle variations in timing and amplitude. This combination supports the interpretation of ID8 as an early postimpact stage in which material on eccentric orbits repeatedly interacts with a warm rocky reservoir, preserving the impact’s mineral fingerprint while the interaction geometry evolves. Material on eccentric orbits can persist for decades, and possibly longer, while interacting with debris disks. Longer-baseline, higher-cadence infrared monitoring of ID8 will further constrain the stability of its recurrence timescale and the detailed evolution of its infrared variability.

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Cite

BibTeXRIS
BibTeX
@article{chen2026recurrent,
  title = {{A Recurrent Infrared Modulation in the Warm Postimpact Debris Disk NGC 2547 ID8}},
  author = {Xiaodian Chen and Shu Wang and Zhuochao Huang},
  journal = {The Astrophysical Journal Letters},
  year = {2026},
  month = oct,
  doi = {10.3847/2041-8213/aeb1cf},
  url = {https://iopscience.iop.org/article/10.3847/2041-8213/aeb1cf},
  note = {CC BY 4.0},
}
RIS
TY  - JOUR
TI  - A Recurrent Infrared Modulation in the Warm Postimpact Debris Disk NGC 2547 ID8
AU  - Xiaodian Chen
AU  - Shu Wang
AU  - Zhuochao Huang
PY  - 2026
DA  - 2026/10/29
JO  - The Astrophysical Journal Letters
DO  - 10.3847/2041-8213/aeb1cf
UR  - https://iopscience.iop.org/article/10.3847/2041-8213/aeb1cf
AB  - Extreme debris disks are signposts of violent rocky collisions, but it remains unclear whether their mid-infrared variability traces transient dust clouds or longer-lived postimpact reservoirs. We analyze a 19 yr mid-infrared record of the young solar analog NGC 2547 ID8, combining four spectra from 2007 to 2024 with 3–5 μ m monitoring through 2026. The optically thin mineral surface remains compositionally stable: broad fits spanning multiple grain sizes give 550–577 K, and a common-basis decomposition with T surf fixed at 560 K is dominated by 1 μ m olivine/Mg-olivine and 0.1 μ m forsterite. The W2-equivalent 4.5 μ m excess, traced across six recurrent high states, is instead driven mainly by changes in the hot-base continuum component and defines a 956.8 days infrared recurrence timescale with cycle-to-cycle variations in timing and amplitude. This combination supports the interpretation of ID8 as an early postimpact stage in which material on eccentric orbits repeatedly interacts with a warm rocky reservoir, preserving the impact’s mineral fingerprint while the interaction geometry evolves. Material on eccentric orbits can persist for decades, and possibly longer, while interacting with debris disks. Longer-baseline, higher-cadence infrared monitoring of ID8 will further constrain the stability of its recurrence timescale and the detailed evolution of its infrared variability.
SN  - 2041-8213
SN  - 2041-8205
ER  -