Vol. 537
In section 1. Letters

Chemical differentiation toward the Pipe nebula starless cores

by P. Frau, J. M. Girart, and M. T. Beltran, A&A 537, L9

Thanks to the new IRAM-30m wide FTS backend, the authors have been able to make a wide line survey at 3 mm toward the young diffuse starless cores of the Pipe nebula. They find a wide variety of abundances and chemistry and propose a new classification of cores based on the strength of their line emission. This classification led them to identify the so-called "Core 47" as a possible failed core, since it is rich in sulfur oxides, indicating it was quite dense recently and has been blown out to a diffuse core now.