Discovery of an Unusual Optical Transient with the Hubble Space Telescope

Details Discovery of an Unusual Optical Transient with the Hubble Space Telescope Discovery of an Unusual Optical Transient with the Hubble Space Telescope

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21343802b&link_type=abstract

American Astronomical Society, AAS Meeting #213, #438.02; Bulletin of the American Astronomical Society, Vol. 41, p.310

Astronomy and Astrophysics

Astronomy

Scientific paper

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 angstroms and 6500 angstroms and a mostly featureless continuum longward of 6500 angstroms. 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 review possible explanations.

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