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V1280 Sco is one of the slowest dust-forming nova ever historically observed.We performed multi-epoch high-spatial resolution observations of thecircumstellar dusty environment of V1280 Sco to investigate the level ofasymmetry of the ejecta We observed V1280 Sco in 2009, 2010 and 2011 usingunprecedented high angular resolution techniques. We used the NACO/VLT adaptiveoptics system in the J, H and K bands, together with contemporaneous VISIR/VLTmid-IR imaging that resolved the dust envelope of V1280 Sco, and SINFONI/VLTobservations secured in 2011. We report the discovery of a dustyhourglass-shaped bipolar nebula. The apparent size of the nebula increased from0.30" x 0.17" in July 2009 to 0.64" x 0.42" in July 2011. The aspect ratiosuggests that the source is seen at high inclination. The central source shinesefficiently in the K band and represents more than 56+/-5% of the total flux in2009, and 87+/-6% in 2011. A mean expansion rate of 0.39+/-0.03 mas per day isinferred from the VISIR observations in the direction of the major axis, whichrepresents a projected upper limit. Assuming that the dust shell expands inthat direction as fast as the low-excitation slow ejecta detected inspectroscopy, this yields a lower limit distance to V1280 Sco of 1kpc; however,the systematic errors remain large due to the complex shape and velocity fieldof the dusty ejecta. The dust seems to reside essentially in the polar caps andno infrared flux is detected in the equatorial regions in the latest dataset.This may imply that the mass-loss was dominantly polar.

The expanding dusty bipolar nebula around the nova V1280 Sco