[1] Univ Geneva, Dept Astron, Chemin Pegasi 51, CH-1290 Versoix, Switzerland
[2] European Southern Observ, Karl Schwarzschild Str 2, D-85748 Garching, Germany
[3] European Southern Observ, Casilla, Alonso Cordova 3107, Santiago 19001, Chile
[4] Univ Claude Bernard Lyon I, CNRS, Ctr Rech Astrophys Lyon, 9 Ave Charles Andre, F-69230 St Genis Laval, France
[5] KTH Royal Inst Technol, Nordita, Hannes Alfvens Vag 12, S-10691 Stockholm, Sweden
[6] Stockholm Univ, Hannes Alfvens Vag 12, S-10691 Stockholm, Sweden
[7] Cosm Dawn Ctr DAWN, Copenhagen, Denmark
[8] Univ Copenhagen, Niels Bohr Inst, Jagtvej 128, DK-2200 Copenhagen N, Denmark
[9] Aix Marseille Univ, CNRS, LAM Lab Astrophys Marseille, UMR 7326, F-13388 Marseille, France
[10] Inst Astrophys Paris, CNRS SU, UMR7095, 98bis Bd Arago, F-75014 Paris, France
[11] Univ Copenhagen, Niels Bohr Inst, Oster Voldgade 5-7, DK-1350 Copenhagen K, Denmark
[12] Princeton Univ, Dept Astrophys Sci, Princeton, NJ 08544 USA
[13] Tech Univ Denmark, DTU Space, Elekt 327, DK-2800 Lyngby, Denmark