SIMBAD references

2016MNRAS.463.3813H - Mon. Not. R. Astron. Soc., 463, 3813-3828 (2016/December-3)

ASASSN-15oi: a rapidly evolving, luminous tidal disruption event at 216 Mpc.

HOLOIEN T.W.-S., KOCHANEK C.S., PRIETO J.L., GRUPE D., CHEN P., GODOY-RIVERA D., STANEK K.Z., SHAPPEE B.J., DONG S., BROWN J.S., BASU U., BEACOM J.F., BERSIER D., BRIMACOMBE J., CARLSON E.K., FALCO E., JOHNSTON E., MADORE B.F., POJMANSKI G. and SEIBERT M.

Abstract (from CDS):

We present ground-based and Swift photometric and spectroscopic observations of the tidal disruption event (TDE) ASASSN-15oi, discovered at the centre of 2MASX J20390918-3045201 (d ≃ 216 Mpc) by the All-Sky Automated Survey for SuperNovae. The source peaked at a bolometric luminosity of L ≃ 1.3 x 1044 erg s–1 and radiated a total energy of E ≃ 6.6 x 1050 erg over the first ∼3.5 months of observations. The early optical/UV emission of the source can be fit by a blackbody with temperature increasing from T ∼ 2 x 104 K to T ∼ 4 x 104 K while the luminosity declines from L ≃ 1.3 x 1044 erg s–1 to L ≃ 2.3 x 1043 erg s–1, requiring the photosphere to be shrinking rapidly. The optical/UV luminosity decline during this period is most consistent with an exponential decline, L∝e^-(t-t_0)/τ_, with τ ≃ 46.5 d for t0 ≃ 57241.6 (MJD), while a power-law decline of L ∝ (t - t0)–α with t0 ≃ 57 212.3 and α = 1.62 provides a moderately worse fit. ASASSN-15oi also exhibits roughly constant soft X-ray emission that is significantly weaker than the optical/UV emission. Spectra of the source show broad helium emission lines and strong blue continuum emission in early epochs, although these features fade rapidly and are not present ∼3 months after discovery. The early spectroscopic features and colour evolution of ASASSN-15oi are consistent with a TDE, but the rapid spectral evolution is unique among optically selected TDEs.

Abstract Copyright: © 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): accretion, accretion discs - black hole physics - galaxies: nuclei - galaxies: nuclei

VizieR on-line data: <Available at CDS (J/MNRAS/463/3813): tablea1.dat>

Simbad objects: 8

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2021.04.13-12:12:02

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