Discovery of a years-delayed radio flare from an unusually slow-evolved tidal disruption event
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| Main Authors: | , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866912189789503488 |
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| author | Zhang, Zhumao Shu, Xinwen Yang, Lei Sun, Luming Ding, Hucheng Yan, Lin Jiang, Ning An, Fangxia Silima, Walter Zhang, Fabao Chandola, Yogesh Wu, Zhongzu Liu, Daizhong Dou, Liming Wang, Jianguo Wang, Yibo Yang, Chenwei Li, Di Zhou, Tianyao Zhang, Wenjie Peng, Fangkun Wang, Tinggui |
| author_facet | Zhang, Zhumao Shu, Xinwen Yang, Lei Sun, Luming Ding, Hucheng Yan, Lin Jiang, Ning An, Fangxia Silima, Walter Zhang, Fabao Chandola, Yogesh Wu, Zhongzu Liu, Daizhong Dou, Liming Wang, Jianguo Wang, Yibo Yang, Chenwei Li, Di Zhou, Tianyao Zhang, Wenjie Peng, Fangkun Wang, Tinggui |
| contents | SDSS J1115+0544 is a unique low-ionization nuclear emission-line region (LINER) galaxy with energetic ultraviolet (UV), optical and mid-infrared outbursts occurring in its nucleus. We present the results from an analysis of multi-wavelength photometric and radio follow-up observations covering a period of ~9 years since its discovery. We find that following a luminosity plateau of ~500 days, the UV/optical emission has decayed back to the pre-outburst level, suggesting that the nuclear outburst might be caused by a stellar tidal disruption event (TDE). In this case, SDSS J1115+0544 could be an unusually slow-evolved optical TDE with longest rise and decline time-scales ever found. Three years later than the optical peak, a delayed radio brightening was found with a 5.5 GHz luminosity as high as ~1.9x10^39 erg/s. Using a standard equipartition analysis, we find the outflow powering the radio emission was launched at t~1260 days with a velocity of beta<~0.1 and kinetic energy of E_K~>10^50 erg. The delayed radio brightening coupled with the disappearing plateau in the UV/optical light curves is consistent with the scenario involving delayed ejection of an outflow from a state transition in the disk. SDSS J1115+0544 is the first TDE displaying both a short-lived UV/optical plateau emission and a late-time radio brightening. Future radio observations of these TDEs in the post-plateau decay phase will help to establish the connection between outflow launching and changes in accretion rate. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_08812 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Discovery of a years-delayed radio flare from an unusually slow-evolved tidal disruption event Zhang, Zhumao Shu, Xinwen Yang, Lei Sun, Luming Ding, Hucheng Yan, Lin Jiang, Ning An, Fangxia Silima, Walter Zhang, Fabao Chandola, Yogesh Wu, Zhongzu Liu, Daizhong Dou, Liming Wang, Jianguo Wang, Yibo Yang, Chenwei Li, Di Zhou, Tianyao Zhang, Wenjie Peng, Fangkun Wang, Tinggui High Energy Astrophysical Phenomena Astrophysics of Galaxies SDSS J1115+0544 is a unique low-ionization nuclear emission-line region (LINER) galaxy with energetic ultraviolet (UV), optical and mid-infrared outbursts occurring in its nucleus. We present the results from an analysis of multi-wavelength photometric and radio follow-up observations covering a period of ~9 years since its discovery. We find that following a luminosity plateau of ~500 days, the UV/optical emission has decayed back to the pre-outburst level, suggesting that the nuclear outburst might be caused by a stellar tidal disruption event (TDE). In this case, SDSS J1115+0544 could be an unusually slow-evolved optical TDE with longest rise and decline time-scales ever found. Three years later than the optical peak, a delayed radio brightening was found with a 5.5 GHz luminosity as high as ~1.9x10^39 erg/s. Using a standard equipartition analysis, we find the outflow powering the radio emission was launched at t~1260 days with a velocity of beta<~0.1 and kinetic energy of E_K~>10^50 erg. The delayed radio brightening coupled with the disappearing plateau in the UV/optical light curves is consistent with the scenario involving delayed ejection of an outflow from a state transition in the disk. SDSS J1115+0544 is the first TDE displaying both a short-lived UV/optical plateau emission and a late-time radio brightening. Future radio observations of these TDEs in the post-plateau decay phase will help to establish the connection between outflow launching and changes in accretion rate. |
| title | Discovery of a years-delayed radio flare from an unusually slow-evolved tidal disruption event |
| topic | High Energy Astrophysical Phenomena Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2501.08812 |