论文标题
部分可观测时空混沌系统的无模型预测
TESS Shines Light on the Origin of the Ambiguous Nuclear Transient ASASSN-18el
论文作者
论文摘要
我们分析了模棱两可的核瞬变（ANT）Asassn-18EL的过境系系卫星（TESS）的高振动数据。 Asassn-18el中的光学更换现象已被认为是由于现有活性银河核（AGN）的吸积率发生了巨大变化，或者是潮汐破坏事件（TDE）的结果。在整个苔丝观察中，可以看到短时间的随机变异性，与AGN一致。 We are able to fit the TESS light curve with a damped-random-walk (DRW) model and recover a rest-frame variability amplitude of $\hatσ = 0.93 \pm 0.02$ mJy and a rest-frame timescale of $τ_{DRW} = 20^{+15}_{-6}$ days.我们发现，Asassn-18el的估计$τ_{Drw} $与DRW时间尺度和中央超级质量黑洞质量之间的明显关系一致。 Asassn-18el的大振幅随机变化，尤其是在耀斑的后期，这表明该蚂蚁的起源可能是由于极端AGN活性而不是TDE所致。
We analyze high-cadence data from the Transiting Exoplanet Survey Satellite (TESS) of the ambiguous nuclear transient (ANT) ASASSN-18el. The optical changing-look phenomenon in ASASSN-18el has been argued to be due to either a drastic change in the accretion rate of the existing active galactic nucleus (AGN) or the result of a tidal disruption event (TDE). Throughout the TESS observations, short-timescale stochastic variability is seen, consistent with an AGN. We are able to fit the TESS light curve with a damped-random-walk (DRW) model and recover a rest-frame variability amplitude of $\hatσ = 0.93 \pm 0.02$ mJy and a rest-frame timescale of $τ_{DRW} = 20^{+15}_{-6}$ days. We find that the estimated $τ_{DRW}$ for ASASSN-18el is broadly consistent with an apparent relationship between the DRW timescale and central supermassive black hole mass. The large-amplitude stochastic variability of ASASSN-18el, particularly during late stages of the flare, suggests that the origin of this ANT is likely due to extreme AGN activity rather than a TDE.
