Tapia, M.M.TapiaPersi, P.P.PersiRomán-Zúñiga, C.C.Román-ZúñigaELIA, Davide QuintinoDavide QuintinoELIAGiovannelli, F.F.GiovannelliSabau-Graziati, L.L.Sabau-Graziati2020-11-262020-11-2620180035-8711http://hdl.handle.net/20.500.12386/28551A new detailed infrared (IR) study of eight star-forming dense condensations (TCs) in M 20, the Trifid nebula, is presented. The aim is to determine the physical properties of the dust in such globules and establish the presence and properties of their embedded protostellar and/or young stellar population. For this, we analysed new Herschel far-IR and Calar Alto near-IR images of the region, combined with Spitzer Infrared Array Camera (Spitzer/IRAC) archival observations. We confirm the presence of several young stellar objects (YSOs), most with mid-IR colours of Class II sources in all but one of the observed cores. Five TCs are dominated in the far-IR by Class I sources with bolometric luminosities between 100 and 500 L<SUB>☉</SUB>. We report the discovery of a possible counterjet to HH 399 and its protostellar engine inside the photodissociation region TC2, as well as a bipolar outflow system, signposted by symmetric H<SUB>2</SUB> emission knots, embedded in TC3. The present results are compatible with previous suggestions that star formation has been active in the region for some 3 × 10<SUP>5</SUP> yr, and that the most recent events in some of these TCs may have been triggered by the expansion of the H II region. We also obtained a revised value for the distance to M 20 of 2.0 ± 0.1 kpc.STAMPAenArticle10.1093/mnras/sty0482-s2.0-85042438887000427141900012https://academic.oup.com/mnras/article-abstract/475/3/3029/48221592018MNRAS.475.3029TFIS/05 - ASTRONOMIA E ASTROFISICA