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We report on the study of interstellar extinction across the Tarantula nebula(30 Doradus), in the Large Magellanic Cloud, using observations from the HubbleTarantula Treasury Project in the 0.3 - 1.6 micron range. The considerable andpatchy extinction inside the nebula causes about 3500 red clump stars to bescattered along the reddening vector in the colour-magnitude diagrams, therebyallowing an accurate determination of the reddening slope in all bands. Themeasured slope of the reddening vector is remarkably steeper in all bands thanin the the Galactic diffuse interstellar medium. At optical wavelengths, thelarger ratio of total-to-selective extinction, namely Rv = 4.5 +/- 0.2, impliesthe presence of a grey component in the extinction law, due to a largerfraction of large grains. The extra large grains are most likely ices fromsupernova ejecta and will significantly alter the extinction properties of theregion until they sublimate in 50 - 100 Myr. We discuss the implications ofthis extinction law for the Tarantula nebula and in general for regions ofmassive star formation in galaxies. Our results suggest that fluxes of stronglystar forming regions are likely to be underestimated by a factor of about 2 inthe optical.

Hubble Tarantula Treasury Project. IV. The extinction law