2017MNRAS.466.1428G


C.D.S. - SIMBAD4 rel 1.7 - 2021.05.16CEST19:57:16

2017MNRAS.466.1428G - Mon. Not. R. Astron. Soc., 466, 1428-1443 (2017/April-1)

The unexpected, long-lasting, UV rebrightening of the superluminous supernova ASASSN-15lh.

GODOY-RIVERA D., STANEK K.Z., KOCHANEK C.S., CHEN P., DONG S., PRIETO J.L., SHAPPEE B.J., JHA S.W., FOLEY R.J., PAN Y.-C., HOLOIEN T.W.-S., THOMPSON T.A., GRUPE D. and BEACOM J.F.

Abstract (from CDS):

Given its peak luminosity and early-time spectra, ASASSN-15lh was classified as the most luminous supernova ever discovered. Here, we report a UV rebrightening of ASASSN-15lh observed with Swift during our follow-up campaign. The rebrightening began at t ≃ 90 d (observer frame) after the primary peak and was followed by a ∼120-d long plateau in the bolometric luminosity, before starting to fade again at t ≃ 210 d. ASASSN-15lh rebrightened in the Swift UV bands by ΔmUVW2 ≃ -1.75 mag, ΔmUVM2 ≃ -1.25 mag and ΔmUVW1 ≃ -0.8 mag, but did not rebrighten in the optical bands. Throughout its initial decline, subsequent rebrightening and renewed decline, the spectra did not show evidence of interactions between the ejecta and circumstellar medium such as narrow emission lines. There are hints of weak Hα emission at late-times, but Margutti et al. have shown that it is narrow line emission consistent with star formation in the host nucleus. By fitting a blackbody, we find that during the rebrightening, the effective photospheric temperature increased from TBB ≃ 11 000 K to TBB ≃ 18 000 K. Over the ∼ 550 d since its detection, ASASSN-15lh has radiated ∼1.7 -1.9 x 1052 erg. Although its physical nature remains uncertain, the evolution of ASASSN-15lh's photospheric radius, its radiated energy and the implied event rate, are all more similar to those of H-poor superluminous supernovae than to tidal disruption events.

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

Journal keyword(s): supernovae: general - supernovae: individual: ASASSN-15lh - supernovae: individual: ASASSN-15lh

Simbad objects: 11

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Number of rows : 11

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 iPTF 13ehe SN* 06 53 21.50 +67 07 56.0           SLSN-I 52 0
2 PS1-14bj SN* 10 02 08.433 +03 39 19.02           ~ 33 0
3 ASASSN -14ae SN* 11 08 40.11 +34 05 52.4           ~ 76 0
4 SN 2010gx SN* 11 25 46.71 -08 49 41.4           SNIc 139 1
5 SN 2015bn SN* 11 33 41.57 +00 43 32.2           SNIc 86 0
6 PTF 12zp SN* 12 30 11.24 +11 44 40.7           SNIa 2 0
7 LEDA 43234 G 12 48 15.2244073438 +17 46 26.496619532   16.5       ~ 164 0
8 PTF 12dam SN* 14 24 46.20 +46 13 48.3           SLSNIc 119 0
9 ASASSN -15oi SN* 20 39 09.096 -30 45 20.71           ~ 69 0
10 Anon J220215-6139 G 22 02 15.39 -61 39 34.6           ~ 14 0
11 SN 2015L ? 22 02 15.45 -61 39 34.6           ~ 118 2

    Equat.    Gal    SGal    Ecl

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2021.05.16-19:57:16

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