The Unusual Late-Time Evolution of the Tidal Disruption Event ASASSN-15oi
| Autor: | Holoien, T. W. -S., Brown, J. S., Auchettl, K., Kochanek, C. S., Prieto, J. L., Shappee, B. J., Van Saders, J. |
|---|---|
| Rok vydání: | 2018 |
| Předmět: | |
| Zdroj: | MNRAS, 480, 5689 (2018) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1093/mnras/sty2273 |
| Popis: | We present late-time optical spectroscopy and X-ray, UV, and optical photometry of the nearby ($d=214$ Mpc, $z=0.0479$) tidal disruption event (TDE) ASASSN-15oi. The optical spectra span 450 days after discovery and show little remaining transient emission or evolution after roughly 3 months. In contrast, the Swift and XMM-Newton observations indicate the presence of evolving X-ray emission and lingering thermal UV emission that is still present 600 days after discovery. The thermal component of the X-ray emission shows a unique, slow brightening by roughly an order of magnitude to become the dominant source of emission from the TDE at later times, while the hard component of the X-ray emission remains weak and relatively constant throughout the flare. The TDE radiated $(1.32\pm0.06)\times10^{51}$ ergs across all wavelengths, and the UV and optical emission is consistent with a power law decline and potentially indicative of a late-time shift in the power-law index that could be caused by a transition in the dominant emission mechanism. Comment: 16 pages, 9 figures, 4 tables. Updated to reflect changes made in the published version |
| Databáze: | arXiv |
| Externí odkaz: |
|