2026-06-29 フランス国立科学研究センター（CNRS）
Map of gamma-ray bursts recorded over 684 days.
＜関連情報＞
- https://news.cnrs.fr/articles/the-distant-past-catches-up-with-the-universe
- https://iopscience.iop.org/article/10.3847/2041-8213/ae3174
SVOM/ECLAIRを用いた4U 0614+091のI型X線バーストにおける振動の検出 Detection of Oscillations in a Type I X-Ray Burst of 4U 0614+091 with SVOM/ECLAIRs
Sébastien Le Stum, Floriane Cangemi, Alexis Coleiro, Sébastien Guillot, Jérôme Chenevez, Philippe Bacon, Nicolas Bellemont, Laurent Bouchet, Tristan Bouchet, Cécile Cavet,…
The Astrophysical Journal Letters Published: 2026 January 19
DOI:10.3847/2041-8213/ae3174
Abstract
On 2025 January 10, a thermonuclear (Type I) X-ray burst from the neutron star low-mass X-ray binary (LMXB) 4U 0614+091 was detected with the ECLAIRs instrument on board the Space-based multiband astronomical Variable Object Monitor mission. We present here a time-resolved spectroscopic analysis of the burst, along with the detection of burst oscillations within a 51 s interval during the decay phase. The oscillation frequency is measured to be ν = 413.674 ± 0.002 Hz, consistent with previous reports. However, we detect a significant downward frequency drift over the burst duration, characterized by v・=(-4.7±0.3)×10-3Hzs-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 4U 0614+091 among the most compact known LMXBs.
