| Autor: |
Hinkle, Jason T, Kochanek, Christopher S, Shappee, Benjamin J, Vallely, Patrick J, Auchettl, Katie, Fausnaugh, Michael, Holoien, Thomas W-S, Treiber, Helena P, Payne, Anna V, Gaudi, B Scott, Stassun, Keivan G, Thompson, Todd A, Tonry, J L, Villanueva, Steven |
| Předmět: |
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| Zdroj: |
Monthly Notices of the Royal Astronomical Society; May2023, Vol. 521 Issue 3, p3517-3526, 10p |
| Abstrakt: |
We analyse 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-time-scale 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 |$\hat{\sigma } = 0.93 \pm 0.02$| mJy and a rest-frame time-scale of |$\tau _{DRW} = 20^{+15}_{-6}$| d. We find that the estimated τ DRW for ASASSN-18el is broadly consistent with an apparent relationship between the DRW time-scale 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. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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