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ASASSN-18ap: A Dusty Tidal Disruption Event Candidate with an Early Bump in the Light Curve

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arxiv 2312.12015 v2 pith:KLOKSB6S submitted 2023-12-19 astro-ph.HE

Yibo Wang , Tingui Wang , Ning Jiang , Xiaer Zhang , JiaZheng Zhu , XinWen Shu , Shifeng Huang , FaBao Zhang
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Zhenfeng Sheng Zheyu Lin
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classification astro-ph.HE
keywords asassn-18apemissionlightopticalbumpcurvedisruptiondusty
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abstract

We re-examined the classification of the optical transient ASASSN-18ap, which was initially identified as a supernova (SNe) upon its discovery. Based on newly emerged phenomena, such as a delayed luminous infrared outburst and the emergence of luminous coronal emission lines, we suggest that ASASSN-18ap is more likely a tidal disruption event (TDE) in a dusty environment, rather than a supernova. The total energy in the infrared outburst is $\rm 3.1\times10^{51}$ erg, which is an order of magnitude higher than the total energy in the optical-to-ultraviolet range, indicating a large dust extinction, an extra-EUV component, or anisotropic continuum emission. A bumpy feature appeared in the optical light curve at the start of brightening, which was reported in a couple of TDEs very recently. This early bump may have been overlooked in the past due to the lack of sufficient sampling of the light curves of most TDEs during their ascending phase, and it could provide insight into the origin of optical emission.

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  1. Insights from the "Red devil" AT 2022fpx: A Dust-reddened Family of Tidal Disruption Events Excluded by Their Apparent Red Color?

    astro-ph.HE 2025-07 conditional novelty 6.0 of 10

    A persistently red nuclear transient that resembles a TDE, together with UV-inclusive SED fits of four known TDEs, indicates the blue-color selection test biases the optical TDE census and blackbody-based TDE energies...

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