A micronova burst in the intermediate polar IGR J17014-4306

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ID: 326149
2026
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Abstract
Abstract We report the detection of a short optical burst in TESS data of IGR J17014-4306, the eclipsing intermediate polar with the longest known orbital period. The burst lasts 1.56 d and shows multiple peaks, reaching (9.3 ± 0.2) × 1033 erg s−1, and releases a total energy of (3.25 ± 0.01) × 1038 erg. The burst parameters are consistent with those of a micronova eruption, currently understood as a thermonuclear runaway in the magnetically-confined accretion column. From its energy, we infer a burned column mass of ∼1.6 × 10−11 M⊙ which, under several assumptions, suggests a recurrence time of ∼20 d. Our search for similar events in long-term Gaia, ASAS-SN, and AAVSO light curves reveals 16 possible fast brightenings over ∼11 yr, suggesting that micronova events may be frequent in IGR J17014-4306. Timing analysis of the TESS data shows that the white-dwarf spin signal remains stable before and after the burst, but is not clearly detectable during the eruption. Its extreme orbital period and eclipsing nature make IGR J17014-4306 an ideal test-bed for further studies of magnetically confined thermonuclear burning on white dwarfs.
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Authors Alexandre S. Oliveira, D. C. Souza, G. J. M. Luna, C. V. Rodrigues
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Journal monthly notices of the royal astronomical society
Year 2026
DOI
10.1093/mnras/stag1579
URL
https://doi.org/10.1093/mnras/stag1579
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