Detection of Oscillations in a Type I X-Ray Burst of 4U 0614+091 with SVOM/ECLAIRs
astro-ph.HE
/ Authors
Sébastien Le Stum, Floriane Cangemi, Alexis Coleiro, Sébastien Guillot, Jérôme Chenevez, Philippe Bacon, Nicolas Bellemont, Laurent Bouchet, Tristan Bouchet, Cécile Cavet
and 22 more authors
Bertrand Cordier, Antoine Foisseau, Olivier Godet, Andrea Goldwurm, Xu-Hui Han, Cyril Lachaud, Zhaosheng Li, Hua-Li Li, Yu-Lei Qiu, Jérôme Rodriguez, Wen-Jun Tan, L. Tao, Lauryne Verwaerde, Chen-Wei Wang, Jing Wang, Jianyan Wei, Chao Wu, Wen-Jin Xie, Li-Ping Xin, Shaolin Xiong, Shuang-Nan Zhang, S. J. Zheng
/ Abstract
On 2025 January 10, a thermonuclear (Type I) X-ray burst from the neutron star low-mass X-ray binary \textit{4U~0614+091} was detected with the ECLAIRs instrument on board the \textit{SVOM} mission. We present here a time-resolved spectroscopic analysis of the burst, along with the detection of burst oscillations within a 51-second interval during the decay phase. The oscillation frequency is measured to be $ν= 413.674 \pm 0.002\,\mathrm{Hz}$, consistent with previous reports. However, we detect a significant downward frequency drift over the burst duration, characterized by $\dotν = (-4.7 \pm 0.3) \times 10^{-3}\,\mathrm{Hz\,s^{-1}}$. This frequency evolution is atypical compared to those observed in similar burst oscillation sources. We tentatively attribute the observed drift to a Doppler shift induced by orbital motion. Under this interpretation, the inferred orbital period must be shorter than 20 minutes, placing \textit{4U~0614+091} among the most compact known low-mass X-ray binaries.