A Recurrent Infrared Modulation in the Warm Post-impact Debris Disk NGC 2547 ID8
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 post-impact reservoirs. We analyze a 19 yr mid-infrared record of the young solar analog NGC 2547 ID8, combining four spectra from 2007-2024 with 3-5 micron 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 micron olivine/Mg-olivine and 0.1 micron forsterite. The W2-equivalent 4.5 micron excess, traced across six recurrent high states, is instead driven mainly by changes in the hot-base continuum component and defines a 956.8 d infrared recurrence timescale with cycle-to-cycle variations in timing and amplitude. This combination supports the interpretation of ID8 as an early post-impact 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.
Related
- Infrared-excess sources in VVV: candidate debris discs, SED characterization, and variability analysis
- An unresolved extreme warm infrared excess toward a nearby low-mass star
- Impact of Gaia-Sausage-Enceladus Debris on Milky Way Escape-velocity Estimates in TNG50
- Impact of Gaia–Sausage–Enceladus Debris on Milky Way Escape-velocity Estimates in TNG50
- Resolved Dust in z ≈ 1 Galaxies with JWST/MIRI MRS: Survey Description and First View on Polycyclic Aromatic Hydrocarbons, Mid-infrared Atomic Emission, and Warm H ₂
BibTeX
@misc{chen2026recurrent,
title = {{A Recurrent Infrared Modulation in the Warm Post-impact Debris Disk NGC 2547 ID8}},
author = {Xiaodian Chen and Shu Wang and Zhuochao Huang},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.10130},
eprint = {2610.10130},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.10130},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - A Recurrent Infrared Modulation in the Warm Post-impact Debris Disk NGC 2547 ID8
AU - Xiaodian Chen
AU - Shu Wang
AU - Zhuochao Huang
PY - 2026
DA - 2026/10/07
PB - arXiv
DO - 10.48550/arxiv.2610.10130
UR - https://arxiv.org/abs/2610.10130
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 post-impact reservoirs. We analyze a 19 yr mid-infrared record of the young solar analog NGC 2547 ID8, combining four spectra from 2007-2024 with 3-5 micron 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 micron olivine/Mg-olivine and 0.1 micron forsterite. The W2-equivalent 4.5 micron excess, traced across six recurrent high states, is instead driven mainly by changes in the hot-base continuum component and defines a 956.8 d infrared recurrence timescale with cycle-to-cycle variations in timing and amplitude. This combination supports the interpretation of ID8 as an early post-impact 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.
ER -