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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
A brown dwarf orbiting an M-dwarf: MOA 2009-BLG-411L
Astronomy and Astrophysics, Volume 547, Article A55, Year 2012
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Description
Context. Caustic crossing is the clearest signature of binary lenses in microlensing. In the present context, this signature is diluted by the large source star but a detailed analysis has allowed the companion signal to be extracted. Aims. MOA 2009-BLG-411 was detected on August 5, 2009 by the MOA-Collaboration. Alerted as a high-magnification event, it was sensitive to planets. Suspected anomalies in the light curve were not confirmed by a real-time model, but further analysis revealed small deviations from a single lens extended source fit. Methods. Thanks to observations by all the collaborations, this event was well monitored. We first decided to characterize the source star properties by using a more refined method than the classical one: we measure the interstellar absorption along the line of sight in five different passbands (VIJHK). Secondly, we model the lightcurve by using the standard technique: make (s,q,α) grids to look for local minima and refine the results by using a downhill method (Markov chain Monte Carlo). Finally, we use a Galactic model to estimate the physical properties of the lens components. Results. We 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 s s-1. We find that the lens is composed of a brown dwarf secondary of mass MS = 0.05 M· orbiting a primary M-star of mass MP = 0.18 M·. We also reveal a new mass-ratio degeneracy for the central caustics of close binaries. Conclusions. As far as we are aware, this is the first detection using the microlensing technique of a binary system in our Galaxy composed of an M-star and a brown dwarf. © 2012 ESO.
Authors & Co-Authors
Bachelet, Etienne
Unknown Affiliation
Fouqué, Pascal
Unknown Affiliation
Han, Cheongho
Unknown Affiliation
Gould, Andrew P.
Unknown Affiliation
Albrow, Michael D.
Unknown Affiliation
Beaulieu, Jean Philippe H.
Unknown Affiliation
Bertin, Emmanuel
Unknown Affiliation
Bond, Ian A.
Unknown Affiliation
Christie, Grant W.
Unknown Affiliation
Heyrovský, D.
Unknown Affiliation
Hörne, Keith D.
Unknown Affiliation
Jörgensen, Uffe Gråe
Unknown Affiliation
Maoz, Dan
Unknown Affiliation
Mathiasen, M.
Unknown Affiliation
Matsunaga, Noriyuki
Unknown Affiliation
McCormick, Jennie M.
Unknown Affiliation
Menzies, John W.
Unknown Affiliation
Nataf, D.
Unknown Affiliation
Natusch, Timothy J.
Unknown Affiliation
Oi, Nagisa
Unknown Affiliation
Renon, N.
Unknown Affiliation
Tsapras, Yiannis
Unknown Affiliation
Udalski, Andrzej
Unknown Affiliation
Yee, Jennifer C.
Unknown Affiliation
Batista, Virginie
Unknown Affiliation
Bennett, David P.
Unknown Affiliation
Brillant, Stéphanie
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Caldwell, John A.R.
Unknown Affiliation
Cassan, Arnaud
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Cole, Andrew A.
Unknown Affiliation
Cook, Kem H.
Unknown Affiliation
Coutures, Christian
Unknown Affiliation
Dieters, Stefan W.B.
Unknown Affiliation
Dominik, Martin
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Dominis-Prester, Dijana
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Donatowicz, J.
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Greenhill, John G.
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Kains, Noé
Unknown Affiliation
Kane, Stephen R.
Unknown Affiliation
Marquette, Jean Baptiste
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Martin, Ralph
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Pollard, Karen R.
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Sahu, Kailash C.
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Street, Rachel A.
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Wambsganss, Joachim
Unknown Affiliation
Williams, Andrew J.
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Zub, Marta
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Bos, Marc
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Dong, Subo
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Drummond, John
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Gaudi, B. Scott
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Graff, David S.
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Janczak, Julia
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Kaspi, Shai S.
Unknown Affiliation
Kozłowski, Szymon Z.
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Lee, Chung-uk
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Monard, Libert A.G.Berto
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Muñoz, José Antonio
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Park, Byeong-gon
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Pogge, Richard W.
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Polishook, David
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Shporer, Avi
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Abe, Fumio
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Botzler, Christine S.
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Fukui, Akihiko
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Furusawa, Kei
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Hearnshaw, John B.
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Itow, Yoshitaka
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Korpela, Aarno V.
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Ling, Chohong
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Masuda, Kimiaki
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Matsubara, Yutaka
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Miyake, Noriyuki
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Muraki, Y.
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Ohnishi, Kouji
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Rattenbury, Nicholas James
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Saito, To
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Sullivan, Denis J.
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Sumi, Takahiro
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Suzuki, Daisuke
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Sweatman, Winston L.
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Tristram, Paul J.
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Wada, Kohei
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Allan, Alasdair
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Bode, Michael F.
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Bramich, Daniel M.
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Clay, Neil R.
Unknown Affiliation
Fraser, Stephen N.
Unknown Affiliation
Hawkins, Eric
Unknown Affiliation
Kerins, Eamonn J.
Unknown Affiliation
Lister, Tim A.
Unknown Affiliation
Mottram, Christopher J.
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Saunders, Eric S.
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Snodgrass, Colin
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Steele, Iain A.
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Wheatley, Peter J.
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Bozza, Valerio
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Browne, Paul
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Burgdorf, Martin J.
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Calchi-Novati, Sebastiano
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Statistics
Citations: 100
Authors: 100
Affiliations: 65
Identifiers
Doi:
10.1051/0004-6361/201219765
ISSN:
00046361
e-ISSN:
14320746