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We present an observational study of the Type IIn supernovae (SNe IIn) 2005ipand 2006jd. Broad-band UV, optical and near-IR photometry, andvisual-wavelength spectroscopy of SN 2005ip complement and extend uponpublished observations to 6.5 years past discovery. Our observations of SN2006jd extend from UV to mid-infrared wavelengths, and like SN 2005ip, arecompared to reported X-ray measurements to understand the nature of theprogenitor. Both objects display a number of similarities with the 1988Z-likesubclass of SN IIn including: (i) remarkably similar early- and late-phaseoptical spectra, (ii) a variety of high ionization coronal lines, (iii)long-duration optical and near-IR emission and, (iv) evidence of cold and warmdust components. However, diversity is apparent including an unprecedentedlate-time r-band excess in SN 2006jd.The observed differences are attributed todifferences between the mass-loss history of the progenitor stars. We concludethat the progenitor of SN 2006jd likely experienced a significant mass-lossevent during its pre-SN evolution akin to the great 19th century eruption of\eta Carinae. Contrarily, as advocated by Smith et al. (2009), we find thecircumstellar environment of SN 2005ip to be more consistent with a clumpy windprogenitor.

Multi-wavelength Observations of the Enduring Type IIn Supernovae 2005ip and 2006jd