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16 results on '"BOND, I. A."'

1. GRBS FOLLOWED-UP BY THE BOOTES NETWORK

Author

Guziy, S., primary, Castro-Tirado, A., additional, Jelinek, M., additional, Gorosabel, J., additional, Kubanek, P., additional, Cunniffe, R., additional, Lara-Gil, O., additional, Rabaza-Castillo, O., additional, Ugarte Postigo, A. de, additional, Sanchez-Ramirez, R., additional, Tello, J., additional, Perez del Pulgar, C., additional, Castillo-Carrion, S., additional, Castro Cerion, J., additional, Mateo Sanguino, T. de J., additional, Hudec, R., additional, Vitek, S., additional, Morena Carretero, B. de la, additional, Diaz Andreu, J., additional, Fernandez-Munoz, R., additional, Perez-Ramirez, D., additional, Yock, P., additional, Allen, W., additional, Bond, I., additional, Kheyfets, I., additional, Christie, G., additional, Sabau-Graziati, L., additional, Cui, C., additional, Fan, Y., additional, and Park, I. H., additional

Published
2020
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2. Chemical evolution of the Galactic bulge as traced by microlensed dwarf and subgiant stars

Author

Bensby, T., primary, Feltzing, S., additional, Gould, A., additional, Yee, J. C., additional, Johnson, J. A., additional, Asplund, M., additional, Meléndez, J., additional, Lucatello, S., additional, Howes, L. M., additional, McWilliam, A., additional, Udalski, A., additional, Szymański, M. K., additional, Soszyński, I., additional, Poleski, R., additional, Wyrzykowski, Ł., additional, Ulaczyk, K., additional, Kozłowski, S., additional, Pietrukowicz, P., additional, Skowron, J., additional, Mróz, P., additional, Pawlak, M., additional, Abe, F., additional, Asakura, Y., additional, Bhattacharya, A., additional, Bond, I. A., additional, Bennett, D. P., additional, Hirao, Y., additional, Nagakane, M., additional, Koshimoto, N., additional, Sumi, T., additional, Suzuki, D., additional, and Tristram, P. J., additional

Published
2017
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3. A companion on the planet/brown dwarf mass boundary on a wide orbit discovered by gravitational microlensing

Author

Poleski, R., primary, Udalski, A., additional, Bond, I. A., additional, Beaulieu, J. P., additional, Clanton, C., additional, Gaudi, S., additional, Szymański, M. K., additional, Soszyński, I., additional, Pietrukowicz, P., additional, Kozłowski, Szymon, additional, Skowron, J., additional, Wyrzykowski, Ł., additional, Ulaczyk, K., additional, Bennett, D. P., additional, Sumi, T., additional, Suzuki, D., additional, Rattenbury, N. J., additional, Koshimoto, N., additional, Abe, F., additional, Asakura, Y., additional, Barry, R. K., additional, Bhattacharya, A., additional, Donachie, M., additional, Evans, P., additional, Fukui, A., additional, Hirao, Y., additional, Itow, Y., additional, Li, M. C. A., additional, Ling, C. H., additional, Masuda, K., additional, Matsubara, Y., additional, Muraki, Y., additional, Nagakane, M., additional, Ohnishi, K., additional, Ranc, C., additional, Saito, To., additional, Sharan, A., additional, Sullivan, D. J., additional, Tristram, P. J., additional, Yamada, T., additional, Yonehara, A., additional, Batista, V., additional, and Marquette, J. B., additional

Published
2017
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4. MOA-2007-BLG-197: Exploring the brown dwarf desert

Author

Ranc, C., Cassan, A., Albrow, M., Kubas, D., Bond, I., Batista, V., Beaulieu, J., Bennett, D., Dominik, M., Dong, S., Fouqué, P., Gould, A., Greenhill, J., Jørgensen, U., Kains, N., Menzies, J., Sumi, T., Bachelet, E., Coutures, C., Dieters, S., Dominis Prester, D., Donatowicz, J., Gaudi, B., Han, C., Hundertmark, M., Horne, K., Kane, S., Lee, C., Marquette, J., Park, B., Pollard, K., Sahu, K., Street, R., Tsapras, Y., Wambsganss, J., Williams, Andrew, Zub, M., Abe, F., Fukui, A., Itow, Y., Masuda, K., Matsubara, Y., Muraki, Y., Ohnishi, K., Rattenbury, N., Saito, T., Sullivan, D., Sweatman, W., Tristram, P., Yock, P., Yonehara, A., Ranc, C., Cassan, A., Albrow, M., Kubas, D., Bond, I., Batista, V., Beaulieu, J., Bennett, D., Dominik, M., Dong, S., Fouqué, P., Gould, A., Greenhill, J., Jørgensen, U., Kains, N., Menzies, J., Sumi, T., Bachelet, E., Coutures, C., Dieters, S., Dominis Prester, D., Donatowicz, J., Gaudi, B., Han, C., Hundertmark, M., Horne, K., Kane, S., Lee, C., Marquette, J., Park, B., Pollard, K., Sahu, K., Street, R., Tsapras, Y., Wambsganss, J., Williams, Andrew, Zub, M., Abe, F., Fukui, A., Itow, Y., Masuda, K., Matsubara, Y., Muraki, Y., Ohnishi, K., Rattenbury, N., Saito, T., Sullivan, D., Sweatman, W., Tristram, P., Yock, P., and Yonehara, A.

Abstract

© ESO 2015. We present the analysis of MOA-2007-BLG-197Lb, the first brown dwarf companion to a Sun-like star detected through gravitational microlensing. The event was alerted and followed-up photometrically by a network of telescopes from the PLANET, MOA, and µFUN collaborations, and observed at high angular resolution using the NaCo instrument at the VLT. From the modelling of the microlensing light curve, we derived basic parameters such as, the binary lens separation in Einstein radius units (s ? 1:13), the mass ratio q = (4:732 ± 0:020) × 10-2 and the Einstein radius crossing time (tE ? 82d). Because of this long time scale, we took annual parallax and orbital motion of the lens in the models into account, as well as finite source effects that were clearly detected during the source caustic exit. To recover the lens system's physical parameters, we combined the resulting light curve best-fit parameters with (J, H, Ks) magnitudes obtained with VLT NaCo and calibrated using IRSF and 2MASS data. From this analysis, we derived a lens total mass of 0:86 ± 0:04 M? and a lens distance of DL = 4:2 ± 0:3 kpc. We find that the companion of MOA-2007-BLG-197L is a brown dwarf of 41 ± 2 MJ observed at a projected separation of a? = 4:3 ± 0:1 AU, and orbits a 0:82 ± 0:04 M? G-K dwarf star. We then placed the companion of MOA-2007-BLG-197L in a mass-period diagram consisting of all brown dwarf companions detected so far through different techniques, including microlensing, transit, radial velocity, and direct imaging (most of these objects orbit solar-type stars). To study the statistical properties of this population, we performed a two-dimensional, non-parametric probability density distribution fit to the data, which draws a structured brown dwarf landscape. We confirm the existence of a reg

Published
2015

5. MOA-2007-BLG-197: Exploring the brown dwarf desert

Author

Ranc, C., primary, Cassan, A., additional, Albrow, M. D., additional, Kubas, D., additional, Bond, I. A., additional, Batista, V., additional, Beaulieu, J.-P., additional, Bennett, D. P., additional, Dominik, M., additional, Dong, Subo, additional, Fouqué, P., additional, Gould, A., additional, Greenhill, J., additional, Jørgensen, U. G., additional, Kains, N., additional, Menzies, J., additional, Sumi, T., additional, Bachelet, E., additional, Coutures, C., additional, Dieters, S., additional, Dominis Prester, D., additional, Donatowicz, J., additional, Gaudi, B. S., additional, Han, C., additional, Hundertmark, M., additional, Horne, K., additional, Kane, S. R., additional, Lee, C.-U., additional, Marquette, J.-B., additional, Park, B.-G., additional, Pollard, K. R., additional, Sahu, K. C., additional, Street, R., additional, Tsapras, Y., additional, Wambsganss, J., additional, Williams, A., additional, Zub, M., additional, Abe, F., additional, Fukui, A., additional, Itow, Y., additional, Masuda, K., additional, Matsubara, Y., additional, Muraki, Y., additional, Ohnishi, K., additional, Rattenbury, N., additional, Saito, To., additional, Sullivan, D. J., additional, Sweatman, W. L., additional, Tristram, P. J., additional, Yock, P. C. M., additional, and Yonehara, A., additional

Published
2015
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6. A giant planet beyond the snow line in microlensing event OGLE-2011-BLG-0251

Author

Kains, N., Street, R., Choi, J., Han, C., Udalski, A., Almeida, L., Jablonski, F., Tristram, P., Jorgensen, U., Szymanski, M., Kubiak, M., Pietrzynski, G., Soszynski, I., Poleski, R., Kozlowski, S., Pietrukowicz, P., Ulaczyk, K., Wyrzykowski, L., Skowron, J., Alsubai, K., Bozza, V., Browne, P., Burgdorf, M., Calchi Novati, S., Dodds, P., Dominik, M., Dreizler, S., Fang, X., Grundahl, F., Gu, C., Hardis, S., Harpsoe, K., Hessman, F., Hinse, T., Hornstrup, A., Hundertmark, M., Jessen-Hansen, J., Kerins, E., Liebig, C., Lund, M., Lundkvist, M., Mancini, L., Mathiasen, M., Penny, M., Rahvar, S., Ricci, D., Sahu, K., Scarpetta, G., Skottfelt, J., Snodgrass, C., Southworth, J., Surdej, J., Tregloan-Reed, J., Wambsganss, J., Wertz, O., Bajek, D., Bramich, D., Horne, K., Ipatov, S., Steele, I., Tsapras, Y., Abe, F., Bennett, D., Bond, I., Botzler, C., Chote, P., Freeman, M., Fukui, A., Furusawa, K., Itow, Y., Ling, C., Masuda, K., Matsubara, Y., Miyake, N., Muraki, Y., Ohnishi, K., Rattenbury, N., Saito, T., Sullivan, D., Sumi, T., Suzuki, D., Suzuki, K., Sweatman, W., Takino, S., Wada, K., Yock, P., Allen, W., Batista, V., Chung, S., Christie, G., DePoy, D., Drummond, J., Gaudi, B., Gould, A., Henderson, C., Jung, Y., Koo, J., Lee, C., McCormick, J., McGregor, D., Munoz, J., Natusch, T., Ngan, H., Park, H., Pogge, R., Shin, I., Yee, J., Albrow, M., Bachelet, E., Beaulieu, J., Brillant, S., Caldwell, J., Cassan, A., Cole, A., Corrales, E., Coutures, C., Dieters, S., Dominis Prester, D., Donatowicz, J., Fouque, P., Greenhill, J., Kane, S., Kubas, D., Marquette, J., Martin, R., Meintjes, P., Menzies, J., Pollard, K., Williams, Andrew, Wouters, D., Zub, M., Kains, N., Street, R., Choi, J., Han, C., Udalski, A., Almeida, L., Jablonski, F., Tristram, P., Jorgensen, U., Szymanski, M., Kubiak, M., Pietrzynski, G., Soszynski, I., Poleski, R., Kozlowski, S., Pietrukowicz, P., Ulaczyk, K., Wyrzykowski, L., Skowron, J., Alsubai, K., Bozza, V., Browne, P., Burgdorf, M., Calchi Novati, S., Dodds, P., Dominik, M., Dreizler, S., Fang, X., Grundahl, F., Gu, C., Hardis, S., Harpsoe, K., Hessman, F., Hinse, T., Hornstrup, A., Hundertmark, M., Jessen-Hansen, J., Kerins, E., Liebig, C., Lund, M., Lundkvist, M., Mancini, L., Mathiasen, M., Penny, M., Rahvar, S., Ricci, D., Sahu, K., Scarpetta, G., Skottfelt, J., Snodgrass, C., Southworth, J., Surdej, J., Tregloan-Reed, J., Wambsganss, J., Wertz, O., Bajek, D., Bramich, D., Horne, K., Ipatov, S., Steele, I., Tsapras, Y., Abe, F., Bennett, D., Bond, I., Botzler, C., Chote, P., Freeman, M., Fukui, A., Furusawa, K., Itow, Y., Ling, C., Masuda, K., Matsubara, Y., Miyake, N., Muraki, Y., Ohnishi, K., Rattenbury, N., Saito, T., Sullivan, D., Sumi, T., Suzuki, D., Suzuki, K., Sweatman, W., Takino, S., Wada, K., Yock, P., Allen, W., Batista, V., Chung, S., Christie, G., DePoy, D., Drummond, J., Gaudi, B., Gould, A., Henderson, C., Jung, Y., Koo, J., Lee, C., McCormick, J., McGregor, D., Munoz, J., Natusch, T., Ngan, H., Park, H., Pogge, R., Shin, I., Yee, J., Albrow, M., Bachelet, E., Beaulieu, J., Brillant, S., Caldwell, J., Cassan, A., Cole, A., Corrales, E., Coutures, C., Dieters, S., Dominis Prester, D., Donatowicz, J., Fouque, P., Greenhill, J., Kane, S., Kubas, D., Marquette, J., Martin, R., Meintjes, P., Menzies, J., Pollard, K., Williams, Andrew, Wouters, D., and Zub, M.

Abstract

Aims. We present the analysis of the gravitational microlensing event OGLE-2011-BLG-0251. This anomalous event was observed by several survey and follow-up collaborations conducting microlensing observations towards the Galactic bulge.Methods. Based on detailed modelling of the observed light curve, we find that the lens is composed of twomasses with a mass ratio q = 1.9 × 10-3. Thanks to our detection of higher-order effects on the light curve due to the Earth’s orbital motion and the finite size of source, we are able to measure the mass and distance to the lens unambiguously.Results. We find that the lens is made up of a planet of mass 0.53 ± 0.21 MJ orbiting an M dwarf host star with a mass of 0.26 ± 0.11 M. The planetary system is located at a distance of 2.57 ± 0.61 kpc towards the Galactic centre. The projected separation of the planet from its host star is d = 1.408 ± 0.019, in units of the Einstein radius, which corresponds to 2.72 ± 0.75 AU in physical units. We also identified a competitive model with similar planet and host star masses, but with a smaller orbital radius of 1.50 ± 0.50 AU. The planet is therefore located beyond the snow line of its host star, which we estimate to be around ~1-1.5 AU.

Published
2013

7. A giant planet beyond the snow line in microlensing event OGLE-2011-BLG-0251

Author

Kains, N., primary, Street, R. A., additional, Choi, J.-Y., additional, Han, C., additional, Udalski, A., additional, Almeida, L. A., additional, Jablonski, F., additional, Tristram, P. J., additional, Jørgensen, U. G., additional, Szymański, M. K., additional, Kubiak, M., additional, Pietrzyński, G., additional, Soszyński, I., additional, Poleski, R., additional, Kozłowski, S., additional, Pietrukowicz, P., additional, Ulaczyk, K., additional, Wyrzykowski, Ł., additional, Skowron, J., additional, Alsubai, K. A., additional, Bozza, V., additional, Browne, P., additional, Burgdorf, M. J., additional, Calchi Novati, S., additional, Dodds, P., additional, Dominik, M., additional, Dreizler, S., additional, Fang, X.-S., additional, Grundahl, F., additional, Gu, C.-H., additional, Hardis, S., additional, Harpsøe, K., additional, Hessman, F. V., additional, Hinse, T. C., additional, Hornstrup, A., additional, Hundertmark, M., additional, Jessen-Hansen, J., additional, Kerins, E., additional, Liebig, C., additional, Lund, M., additional, Lundkvist, M., additional, Mancini, L., additional, Mathiasen, M., additional, Penny, M. T., additional, Rahvar, S., additional, Ricci, D., additional, Sahu, K. C., additional, Scarpetta, G., additional, Skottfelt, J., additional, Snodgrass, C., additional, Southworth, J., additional, Surdej, J., additional, Tregloan-Reed, J., additional, Wambsganss, J., additional, Wertz, O., additional, Bajek, D., additional, Bramich, D. M., additional, Horne, K., additional, Ipatov, S., additional, Steele, I. A., additional, Tsapras, Y., additional, Abe, F., additional, Bennett, D. P., additional, Bond, I. A., additional, Botzler, C. S., additional, Chote, P., additional, Freeman, M., additional, Fukui, A., additional, Furusawa, K., additional, Itow, Y., additional, Ling, C. H., additional, Masuda, K., additional, Matsubara, Y., additional, Miyake, N., additional, Muraki, Y., additional, Ohnishi, K., additional, Rattenbury, N., additional, Saito, T., additional, Sullivan, D. J., additional, Sumi, T., additional, Suzuki, D., additional, Suzuki, K., additional, Sweatman, W. L., additional, Takino, S., additional, Wada, K., additional, Yock, P. C. M., additional, Allen, W., additional, Batista, V., additional, Chung, S.-J., additional, Christie, G., additional, DePoy, D. L., additional, Drummond, J., additional, Gaudi, B. S., additional, Gould, A., additional, Henderson, C., additional, Jung, Y.-K., additional, Koo, J.-R., additional, Lee, C.-U., additional, McCormick, J., additional, McGregor, D., additional, Muñoz, J. A., additional, Natusch, T., additional, Ngan, H., additional, Park, H., additional, Pogge, R. W., additional, Shin, I.-G., additional, Yee, J., additional, Albrow, M. D., additional, Bachelet, E., additional, Beaulieu, J.-P., additional, Brillant, S., additional, Caldwell, J. A. R., additional, Cassan, A., additional, Cole, A., additional, Corrales, E., additional, Coutures, Ch., additional, Dieters, S., additional, Dominis Prester, D., additional, Donatowicz, J., additional, Fouqué, P., additional, Greenhill, J., additional, Kane, S. R., additional, Kubas, D., additional, Marquette, J.-B., additional, Martin, R., additional, Meintjes, P., additional, Menzies, J., additional, Pollard, K. R., additional, Williams, A., additional, Wouters, D., additional, and Zub, M., additional

Published
2013
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8. GRBS Followed-up by the bootes network

Author

Guziy, S., primary, Castro-Tirado, A., additional, Jelínek, M., additional, Gorosabel, J., additional, Kubánek, P., additional, Cunniffe, R., additional, Lara-Gil, O., additional, Rabaza-Castillo, O., additional, de Ugarte Postigo, A., additional, Sánchez-Ramírez, R., additional, Tello, J., additional, Pérez del Pulgar, C., additional, Castillo-Carrión, S., additional, Castro Cerón, J., additional, Mateo Sanguino, T. de J., additional, Hudec, R., additional, Vitek, S., additional, de la Morena Carretero, B., additional, Díaz Andreu, J., additional, Fernández-Muñoz, R., additional, Pérez-Ramírez, D., additional, Yock, P., additional, Allen, W., additional, Bond, I., additional, Kheyfets, I., additional, Christie, G., additional, Sabau-Graziati, L., additional, Cui, C., additional, Fan, Y., additional, and Park, I.H., additional

Published
2013
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9. Chemical evolution of the Galactic bulge as traced by microlensed dwarf and subgiant stars

Author

Bensby, T., primary, Yee, J. C., additional, Feltzing, S., additional, Johnson, J. A., additional, Gould, A., additional, Cohen, J. G., additional, Asplund, M., additional, Meléndez, J., additional, Lucatello, S., additional, Han, C., additional, Thompson, I., additional, Gal-Yam, A., additional, Udalski, A., additional, Bennett, D. P., additional, Bond, I. A., additional, Kohei, W., additional, Sumi, T., additional, Suzuki, D., additional, Suzuki, K., additional, Takino, S., additional, Tristram, P., additional, Yamai, N., additional, and Yonehara, A., additional

Published
2013
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10. A frozen super-Earth orbiting a star at the bottom of the main sequence

Author

Kubas, D., primary, Beaulieu, J. P., additional, Bennett, D. P., additional, Cassan, A., additional, Cole, A., additional, Lunine, J., additional, Marquette, J. B., additional, Dong, S., additional, Gould, A., additional, Sumi, T., additional, Batista, V., additional, Fouqué, P., additional, Brillant, S., additional, Dieters, S., additional, Coutures, C., additional, Greenhill, J., additional, Bond, I., additional, Nagayama, T., additional, Udalski, A., additional, Pompei, E., additional, Nürnberger, D. E. A., additional, and Le Bouquin, J. B., additional

Published
2012
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11. Chemical evolution of the Galactic bulge as traced by microlensed dwarf and subgiant stars

Author

Bensby, T., primary, Adén, D., additional, Meléndez, J., additional, Gould, A., additional, Feltzing, S., additional, Asplund, M., additional, Johnson, J. A., additional, Lucatello, S., additional, Yee, J. C., additional, Ramírez, I., additional, Cohen, J. G., additional, Thompson, I., additional, Bond, I. A., additional, Gal-Yam, A., additional, Han, C., additional, Sumi, T., additional, Suzuki, D., additional, Wada, K., additional, Miyake, N., additional, Furusawa, K., additional, Ohmori, K., additional, Saito, To., additional, Tristram, P., additional, and Bennett, D., additional

Published
2011
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12. Chemical evolution of the Galactic bulge as traced by microlensed dwarf and subgiant stars

Author

Bensby, T., primary, Feltzing, S., additional, Johnson, J. A., additional, Gould, A., additional, Adén, D., additional, Asplund, M., additional, Meléndez, J., additional, Gal-Yam, A., additional, Lucatello, S., additional, Sana, H., additional, Sumi, T., additional, Miyake, N., additional, Suzuki, D., additional, Han, C., additional, Bond, I., additional, and Udalski, A., additional

Published
2010
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13. Determination of stellar shape in microlensing event MOA 2002-BLG-33

Author

Rattenbury, N. J., primary, Abe, F., additional, Bennett, D. P., additional, Bond, I. A., additional, Calitz, J. J., additional, Claret, A., additional, Cook, K. H., additional, Furuta, Y., additional, Gal-Yam, A., additional, Glicenstein, J.-F., additional, Hearnshaw, J. B., additional, Hauschildt, P. H., additional, Kilmartin, P. M., additional, Kurata, Y., additional, Masuda, K., additional, Maoz, D., additional, Matsubara, Y., additional, Meintjes, P. J., additional, Moniez, M., additional, Muraki, Y., additional, Noda, S., additional, Ofek, E. O., additional, Okajima, K., additional, Philpott, L., additional, Rhie, S. H., additional, Sako, T., additional, Sullivan, D. J., additional, Sumi, T., additional, Terndrup, D. M., additional, Tristram, P. J., additional, Wood, J., additional, Yanagisawa, T., additional, and Yock, P. C. M., additional

Published
2005
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14. Probing the atmosphere of a solar-like star by galactic microlensing at high magnification

Author

Abe, F., primary, Bennett, D. P., additional, Bond, I. A., additional, Calitz, J. J., additional, Claret, A., additional, Cook, K. H., additional, Furuta, Y., additional, Gal-Yam, A., additional, Glicenstein, J.-F., additional, Hearnshaw, J. B., additional, Hauschildt, P. H., additional, Kent, D., additional, Kilmartin, P. M., additional, Kurata, Y., additional, Masuda, K., additional, Maoz, D., additional, Matsubara, Y., additional, Meintjes, P. J., additional, Moniez, M., additional, Muraki, Y., additional, Noda, S., additional, Ofek, E. O., additional, Okajima, K., additional, Philpott, L., additional, Rattenbury, N. J., additional, Rhie, S. H., additional, Sako, T., additional, Sullivan, D. J., additional, Sumi, T., additional, Terndrup, D. M., additional, Tristram, P. J., additional, Yanagisawa, T., additional, and Yock, P. C. M., additional

Published
2003
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15. The nature of V359 Centauri revealed: New long-period SU UMa-type dwarf nova

Author

Kato, T., primary, Stubbings, R., additional, Nelson, P., additional, Santallo, R., additional, Ishioka, R., additional, Uemura, M., additional, Sumi, T., additional, Muraki, Y., additional, Kilmartin, P., additional, Bond, I., additional, Noda, S., additional, Yock, P., additional, Hearnshaw, J. B., additional, Monard, B., additional, and Yamaoka, H., additional

Published
2002
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16. A brown dwarf orbiting an M-dwarf: MOA 2009-BLG-411L.

Author

Bachelet, E., Fouqué, P., Han, C., Gould, A., Albrow, M. D., Beaulieu, J.-P., Bertin, E., Bond, I. A., Christie, G. W., Heyrovský, D., Horne, K., Jørgensen, U. G., Maoz, D., Mathiasen, M., Matsunaga, N., McCormick, J., Menzies, J., Nataf, D., Natusch, T., and Oi, N.

Subjects
DWARF stars, CAUSTICS (Optics), GIANT stars, INTERSTELLAR medium, ASTRONOMY, ASTROPHYSICS
Abstract

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 [ABSTRACT FROM AUTHOR]

Published
2012
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