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ASASSN-15lh: A highly super-luminous supernova

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Science  15 Jan 2016:
Vol. 351, Issue 6270, pp. 257-260
DOI: 10.1126/science.aac9613
  • Fig. 1 Multi-band light curve of ASASSN-15lh.

    The V-band ASAS-SN light curve is shown as black solid dots, and upper limits are represented by black arrows. Swift and LCOGT 1-m data are shown as open circles.

  • Fig. 2 Rest-frame spectra of ASASSN-15lh (black) compared with SLSN-I PTF10cwr/SN 2010gx (red).

    (A) The spectra are offset for clarity, labeled with phases and telescopes, and ranked by descending TBB (given on the right) from the top. The ASASSN-15lh spectra are blue and featureless, except for broad absorption features labeled “a,” “b,” and “c” (marked in blue), which match those of PTF10cwr/SN 2010gx at similar TBB. Absorption features “a” at ~4100 Å and “d” at ~4400 Å (marked in red) in PTF10cwr/SN 2010gx are commonly attributed to O II (3, 15). The ~4400 Å feature is not present in ASASSN-15lh. (B) Close-ups of the 4100 Å features, whose evolution in shape, depth, and velocity as a function of TBB is similar for both supernovae. (C and D) The ASASSN-15lh host redshift (z = 0.2326) is determined from the Mg II doublets seen in the SALT and Clay MagE spectra, with EW 0.55 ± 0.05 and 0.49 ± 0.05 Å in (C) and (D), respectively.

  • Fig. 3 Time evolution of blackbody temperatures, radii and bolometric luminosities for ASASSN-15lh (black) and SLSN-I iPTF13ajg (red).

    Solid black dots show estimates derived from the full UV and optical bands, whereas the open circles show those from optical only. For trest < 10 days, only V-band is available, and the temperatures are estimated on the basis of linear extrapolation from MJD = 57191 – 57241.

  • Fig. 4 Rest-frame absolute magnitude light curve of ASASSN-15lh near peak compared with other SLSNe-I.

    Estimates of Mu,AB for ASASSN-15lh at trest ≳ 10 days are derived from B-band fluxes, which are subject to small K-corrections, whereas the less reliable Mu,AB estimates are based on V-band only for trest ≲ 10 days. The comparison sample (3, 17) includes the most luminous SLSNe-I previously known. At Mu,AB = –23.5, ASASSN-15lh stands out from the SLSNe-I luminosity distribution (2, 19). Its peak bolometric absolute magnitude is more than ~1 mag more luminous than any other SLSN-I.

Supplementary Materials

  • ASASSN-15lh: A highly super-luminous supernova

    Subo Dong, B. J. Shappee, J. L. Prieto, S. W. Jha, K. Z. Stanek, T. W.-S. Holoien, C. S. Kochanek, T. A. Thompson, N. Morrell, I. B. Thompson, U. Basu, J. F. Beacom, D. Bersier, J. Brimacombe, J. S. Brown, F. Bufano, Ping Chen, E. Conseil, A. B. Danilet, E. Falco, D. Grupe, S. Kiyota, G. Masi, B. Nicholls, F. Olivares E., G. Pignata, G. Pojmanski, G. V. Simonian, D. M. Szczygiel, P. R. Woźniak

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