A brown dwarf orbiting an M-dwarf: MOA 2009-BLG-411L

• Published in: Astronomy and astrophysics (Berlin) 2012-11, Vol.547, p.1-1
• Main Authors: Bachelet, E, Fouque, P, Han, C, Gould, A, Albrow, M D, Beaulieu, J-P, Bertin, E, Bond, I A, Christie, G W, Heyrovsky, D, Novati, S Calchi, Dreizler, S, Finet, F, Glitrup, M, Grundahl, F, Harpsoee, K, Hessman, F V, Hinse, T C, Hundertmark, M, Liebig, C, Horne, K, Maier, G, Mancini, L, Rahvar, S, Ricci, D, Scarpetta, G, Skottfelt, J, Southworth, J, Surdej, J, Zimmer, F, Joergensen, U G, Maoz, D, Mathiasen, M, Matsunaga, N, McCormick, J, Menzies, J, Nataf, D, Natusch, T, Oi, N, Renon, N, Tsapras, Y, Udalski, A, Yee, J C, Batista, V, Bennett, D P, Brillant, S, Caldwell, J A R, Cassan, A, Cole, A, Cook, K H, et. al
• Format: Article
• Language: English
• Subjects: Indexing in process
• ISSN: 0004-6361; 1432-0746

MOA 2009-BLG-411 was detected on August 5, 2009 by the MOA-Collaboration. Thanks to observations by all the collaborations, this event was well monitored. The authors first decided to characterize the source star properties by using a more refined method than the classical one: they measure the interstellar absorption along the line of sight in five different passbands. Secondly, they model the lightcurve by using the standard technique: make grids to look for local minima and refine the results by using a downhill method. Finally, they use a Galactic model to estimate the physical properties of the lens components. They find that the source star is a giant G star with radius 9 R. The grid search gives two local minima, which correspond to the theoretical degeneracy ... . They find that the lens is composed of a brown dwarf secondary of mass M sub( s) =0.05 M orbiting a primary M-star of mass M super( p) = 0.18 M. (ProQuest: ... denotes formulae/symbols omitted.)