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A remarkable fraction of supernovae (SNe) have no obvious host galaxy. Twopossible explanations are that (i) the host galaxy is simply not detectedwithin the sensitivity of the available data or that (ii) the progenitor is ahypervelocity star that has escaped its parent galaxy. We use the Type IIb SN2009Z as a prototype of case (i), an example of how a very faint (here LowSurface Brightness; LSB) galaxy can be discovered via the observation of aseemingly host-less SN. By identifying and studying LSB galaxies that host SNerelated to the death of massive stars, we can place constraints on the stellarpopulation and environment of LSB galaxies, which at present are poorlyunderstood. From an HI spectrum, a redshift of z = 0.02513+-0.00001 and an HImass of (2.96+-0.12) 10^9 M_sun are computed. This redshift is consistent withthat obtained from optical emission lines of SN 2009Z. Furthermore, a gas massfraction of f_g = 0.87+-0.04 is obtained, one of the highest fractions evermeasured. The host galaxy shows signs of recently enhanced star formationactivity with a far-UV derived extinction-corrected Star Formation Rate (SFR)of 0.44+-0.34 M_sun/yr. Based on the B-band luminosity we estimate anextinction-corrected metallicity following the calibration by Pilyugin (2001)of 12 + log(O/H) = 8.24+-0.70. The presence of a Type IIb SN in an LSB galaxysuggests, contrary to popular belief, that massive stars can be formed in thistype of galaxies. Furthermore, our results imply that LSB galaxies undergophases of small, local burst activity intermittent with longer phases ofinactivity.

Supernovae without host galaxies? The low surface brightness host of SN 2009Z