Host galaxy line diagnostics for the candidate tidal disruption events XMMSL1 J111527.3+180638 and PTF09axc

ABSTRACT We present results of our analysis spectra the host galaxies candidate tidal disruption events (TDEs) XMMSL1 J111527.3+180638 and PTF09axc to determine nature these transients. subtract starlight component from galaxy origin nuclear emission lines. Using a Baldwin–Phillips–Terlevich (BPT) diagram, we conclude that is classified as Seyfert galaxy, suggesting this transient likely be caused by (extreme) variability in active galactic nucleus. find falls ‘star-forming’ region BPT implying strong TDE candidate. For both galaxies, WISE colour difference W1 − W2 < 0.8, which means there no indication dusty torus therefore an nucleus, seemingly contradicting finding for J111527.3+180638. discuss possible reasons discrepant obtained through two methods.