Neustadt, J. M. M. and Holoien, T. W-S and Kochanek, C. S. and Auchettl, K. and Brown, J. S. and Shappee, B. J. and Pogge, R. W. and Dong, Subo and Stanek, K. Z. and Tucker, M. A. and Bose, S. and Chen, Ping and Ricci, C. and Vallely, P. J. and Prieto, J. L. and Coulter, D. A. and Drout, M. R. and Foley, R. J. and Kilpatrick, C. D. and Piro, A. L. and Rojas-Bravo, C. and Buckley, D. A. H. and Gromadzki, M. and Dimitriadis, G. and Siebert, M. R. and Do, A. and Huber, M. E. and Payne, A. (2020) To TDE or not to TDE: the luminous transient ASASSN-18jd with TDE-like and AGN-like qualities. Monthly Notices of the Royal Astronomical Society, 494 (2). pp. 2538-2560. ISSN 0035-8711
Full text not available from this repository.Abstract
We present the discovery of ASASSN-18jd (AT 2018bcb), a luminous optical/ ultraviolet(UV)/X-ray transient located in the nucleus of the galaxy 2MASX J22434289- 1659083 at z = 0.1192. Over the year after discovery, Swift UltraViolet and Optical Telescope (UVOT) photometry shows the UV spectral energy distribution of the transient to be well modelled by a slowly shrinking blackbody with temperature T ∼ 2.5 × 104 K, a maximum observed luminosity of Lmax = 4.5+0.6 -0.3 × 1044 erg s-1, and a radiated energy of E = 9.6+1.1 -0.6 × 1051 erg. X-ray data from Swift X-Ray Telescope (XRT) and XMM-Newton show a transient, variable X-ray flux with blackbody and power-law components that fade by nearly an order of magnitude over the following year. Optical spectra show strong, roughly constant broad Balmer emission and transient features attributable to He II, NIII-V, OIII, and coronal Fe. While ASASSN-18jd shares similarities with tidal disruption events (TDEs), it is also similar to the newly discovered nuclear transients seen in quiescent galaxies and faint active galactic nuclei (AGNs).