Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-09-10
Astrophys.J.690:1358-1362,2009
Astronomy and Astrophysics
Astrophysics
5 pages, 4 figures. Accepted for publication in ApJ. Data are available at http://supernova.lbl.gov/2006Transient/
Scientific paper
10.1088/0004-637X/690/2/1358
We present observations of SCP 06F6, an unusual optical transient discovered during the Hubble Space Telescope Cluster Supernova Survey. The transient brightened over a period of ~100 days, reached a peak magnitude of ~21.0 in both i_775 and z_850, and then declined over a similar timescale. There is no host galaxy or progenitor star detected at the location of the transient to a 3 sigma upper limit of i_775 = 26.4 and z_850 = 26.1, giving a corresponding lower limit on the flux increase of a factor of ~120. Multiple spectra show five broad absorption bands between 4100 AA and 6500 AA and a mostly featureless continuum longward of 6500 AA. The shape of the lightcurve is inconsistent with microlensing. The transient's spectrum, in addition to being inconsistent with all known supernova types, is not matched to any spectrum in the Sloan Digital Sky Survey (SDSS) database. We suggest that the transient may be one of a new class.
Aldering Greg
Amanullah Rahman
Barbary Kyle
Connolly N. V.
Cosmology Project for the Supernova
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