TESS 阐明模糊核瞬变 ASASSN-18el 的起源
TESS Shines Light on the Origin of the Ambiguous Nuclear Transient ASASSN-18el
AI总结：
本研究利用 TESS 数据分析模糊核瞬变 ASASSN-18el，通过 DRW 模型拟合光变曲线，发现其大振幅随机变异性与 AGN 质量关系一致，推断其起源更可能是极端 AGN 活动而非 TDE。
摘要：
我们分析了模糊核瞬变（ANT）ASASSN-18el 的凌日系外行星巡天卫星（TESS）高频次数据。ASASSN-18el 的光学“变脸”现象被认为源于现有活动星系核（AGN）吸积率的剧烈变化，或是潮汐瓦解事件（TDE）的结果。在整个 TESS 观测期间，观测到了与 AGN 一致的短时标随机变异性。我们用阻尼随机游走（DRW）模型拟合了 TESS 光变曲线，恢复了静止系变振幅 $\hatσ = 0.93 \pm 0.02$ mJy 和静止系时标 $τ_{DRW} = 20^{+15}_{-6}$ 天。我们发现 ASASSN-18el 估计的 $τ_{DRW}$ 与 DRW 时标和中心超大质量黑洞质量之间的表观关系大致一致。ASASSN-18el 的大振幅随机变异性，特别是在耀斑的后期阶段，表明该 ANT 的起源可能归因于极端的 AGN 活动而非 TDE。
英文摘要：
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.
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