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Type: Artigo
Title: Rapidly evolving transients in the dark energy survey
Author: Pursiainen, M.
Childress, M.
Smith, M.
Prajs, S.
Sullivan, M.
Davis, T. M.
Foley, R. J.
Asorey, J.
Calcino, J.
Carollo, D.
Curtin, C.
D'Andrea, C. B.
Glazebrook, K.
Gutierrez, C.
Hinton, S. R.
Hoormann, J. K.
Inserra, C.
Kessler, R.
King, A.
Kuehn, K.
Lewis, G. F.
Lidman, C.
Macaulay, E.
Moller, A.
Nichol, R. C.
Sako, M.
Sommer, N. E.
Swann, E.
Tucker, B. E.
Uddin, S. A.
Wiseman, P.
Zhang, B.
Abbott, T. M. C.
Abdalla, F. B.
Allam, S.
Annis, J.
Avila, S.
Brooks, D.
Buckley-Geer, E.
Burke, D. L.
Rosell, A. Carnero
Kind, M. Carrasco
Carretero, J.
Castander, F. J.
Cunha, C. E.
Davis, C.
De Vicente, J.
Diehl, H. T.
Doel, P.
Eifler, T. F.
Flaugher, B.
Fosalba, P.
Frieman, J.
Garcia-Bellido, J.
Gruen, D.
Gruendl, R. A.
Gutierrez, G.
Hartley, W. G.
Hollowood, D. L.
Honscheid, K.
James, D. J.
Jeltema, T.
Kuropatkin, N.
Li, T. S.
Lima, M.
Maia, M. A. G.
Martini, P.
Menanteau, F.
Ogando, R. L. C.
Plazas, A. A.
Roodman, A.
Sanchez, E.
Scarpine, V.
Schindler, R.
Smith, R. C.
Soares-Santos, M.
Sobreira, F.
Suchyta, E.
Swanson, M. E. C.
Tarle, G.
Tucker, D. L.
Walker, A. R.
Abstract: We present the results of a search for rapidly evolving transients in the Dark Energy Survey Supernova Programme. These events are characterized by fast light-curve evolution (rise to peak in less than or similar to 10 d and exponential decline in less than or similar to 30 d after peak). We discovered 72 events, including 37 transients with a spectroscopic redshift from host galaxy spectral features. The 37 events increase the total number of rapid optical transients by more than a factor of two. They are found at a wide range of redshifts (0.05 < z < 1.56) and peak brightnesses (-15.75 gt; M-g gt; -22.25). The multiband photometry is well fit by a blackbody up to few weeks after peak. The events appear to be hot (T approximate to 10 000-30 000 K) and large (R approximate to 10(14) -2 x 10(15) cm) at peak, and generally expand and cool in time, though some events show evidence for a receding photosphere with roughly constant temperature. Spectra taken around peak are dominated by a blue featureless continuum consistent with hot, optically thick ejecta. We compare our events with a previously suggested physical scenario involving shock breakout in an optically thick wind surrounding a core-collapse supernova, we conclude that current models for such a scenario might need an additional power source to describe the exponential decline. We find that these transients tend to favour star-forming host galaxies, which could be consistent with a core-collapse origin. However, more detailed modelling of the light curves is necessary to determine their physical origin.
Subject: Supernova (Estrela)
Energia escura (Astronomia)
Country: Reino Unido
Editor: Oxford University Press
Rights: aberto
Identifier DOI: 10.1093/mnras/sty2309
Date Issue: 2018
Appears in Collections:IFGW - Artigos e Outros Documentos

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