2012ApJ...751...41C

Query : 2012ApJ...751...41C

2012ApJ...751...41C - Astrophys. J., 751, 41 (2012/May-3)

Characterizing lenses and lensed stars of high-magnification single-lens gravitational microlensing events with lenses passing over source stars.

CHOI J.-Y., SHIN I.-G., PARK S.-Y., HAN C., GOULD A., SUMI T., UDALSKI A., BEAULIEU J.-P., STREET R., DOMINIK M., ALLEN W., ALMEIDA L.A., BOS M., CHRISTIE G.W., DEPOY D.L., DONG S., DRUMMOND J., GAL-YAM A., GAUDI B.S., HENDERSON C.B., HUNG L.-W., JABLONSKI F., JANCZAK J., LEE C.-U., MALLIA F., MAURY A., McCORMICK J., McGREGOR D., MONARD L.A.G., MOORHOUSE D., MUNOZ J.A., NATUSCH T., NELSON C., PARK B.-G., POGGE R.W., TAN T.-G., THORNLEY G., YEE J.C. (The {mu}FUN Collaboration), ABE F., BARNARD E., BAUDRY J., BENNETT D.P., BOND I.A., BOTZLER C.S., FREEMAN M., FUKUI A., FURUSAWA K., HAYASHI F., HEARNSHAW J.B., HOSAKA S., ITOW Y., KAMIYA K., KILMARTIN P.M., KOBARA S., KORPELA A., LIN W., LING C.H., MAKITA S., MASUDA K., MATSUBARA Y., MIYAKE N., MURAKI Y., NAGAYA M., NISHIMOTO K., OHNISHI K., OKUMURA T., OMORI K., PERROTT Y.C., RATTENBURY N., SAITO T., SKULJAN L., SULLIVAN D.J., SUZUKI D., SUZUKI K., SWEATMAN W.L., TAKINO S., TRISTRAM P.J., WADA K., YOCK P.C.M. (The MOA Collaboration), SZYMANSKI M.K., KUBIAK M., PIETRZYNSKI G., SOSZYNSKI I., POLESKI R., ULACZYK K., WYRZYKOWSKI L., KOZLOWSKI S., PIETRUKOWICZ P. (The OGLE Collaboration), ALBROW M.D., BACHELET E., BATISTA V., BENNETT C.S., BOWENS-RUBIN R., BRILLANT S., CASSAN A., COLE A., CORRALES E., COUTURES Ch., DIETERS S., DOMINIS PRESTER D., DONATOWICZ J., FOUQUE P., GREENHILL J., KANE S.R., MENZIES J., SAHU K.C., WAMBSGANSS J., WILLIAMS A., ZUB M. (The PLANET Collaboration), ALLAN A., BRAMICH D.M., BROWNE P., CLAY N., FRASER S., HORNE K., KAINS N., MOTTRAM C., SNODGRASS C., STEELE I., TSAPRAS Y. (The RoboNet Collaboration), ALSUBAI K.A., BOZZA V., BURGDORF M.J., CALCHI NOVATI S., DODDS P., DREIZLER S., FINET F., GERNER T., GLITRUP M., GRUNDAHL F., HARDIS S., HARPSOE K., HINSE T.C., HUNDERTMARK M., JORGENSEN U.G., KERINS E., LIEBIG C., MAIER G., MANCINI L., MATHIASEN M., PENNY M.T., PROFT S., RAHVAR S., RICCI D., SCARPETTA G., SCHAFER S., SCHONEBECK F., SKOTTFELT J., SURDEJ J., SOUTHWORTH J., ZIMMER F. (The MiNDSTEp Consortium)

Abstract (from CDS):

We present the analysis of the light curves of nine high-magnification single-lens gravitational microlensing events with lenses passing over source stars, including OGLE-2004-BLG-254, MOA-2007-BLG-176, MOA-2007-BLG-233/OGLE-2007-BLG-302, MOA-2009-BLG-174, MOA-2010-BLG-436, MOA-2011-BLG-093, MOA-2011-BLG-274, OGLE-2011-BLG-0990/MOA-2011-BLG-300, and OGLE-2011-BLG-1101/MOA-2011-BLG-325. For all of the events, we measure the linear limb-darkening coefficients of the surface brightness profile of source stars by measuring the deviation of the light curves near the peak affected by the finite-source effect. For seven events, we measure the Einstein radii and the lens-source relative proper motions. Among them, five events are found to have Einstein radii of less than 0.2 mas, making the lenses very low mass star or brown dwarf candidates. For MOA-2011-BLG-274, especially, the small Einstein radius of θE∼ 0.08 mas combined with the short timescale of tE∼ 2.7 days suggests the possibility that the lens is a free-floating planet. For MOA-2009-BLG-174, we measure the lens parallax and thus uniquely determine the physical parameters of the lens. We also find that the measured lens mass of ∼0.84 M☉ is consistent with that of a star blended with the source, suggesting that the blend is likely to be the lens. Although we did not find planetary signals for any of the events, we provide exclusion diagrams showing the confidence levels excluding the existence of a planet as a function of the separation and mass ratio.

Abstract Copyright: ∼

Journal keyword(s): Galaxy: bulge - gravitational lensing: micro

Simbad objects: 23

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Number of rows : 23
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 OGLE-2007-BLG-224 * 08 05 41.0 -28 45 36           FV 27 0
2 OGLE-2003-BUL-238 * 17 45 50.34 -22 40 58.1           K2III 12 0
3 MOA 2011-BLG-93 * 17 46 17.830 -34 20 24.76           GIII 4 0
4 OGLE-2011-BLG-0990 * 17 51 30.240 -30 17 46.70           ~ 3 0
5 MOA 2009-BLG-411 * 17 53 58.400 -29 44 56.01           ~ 7 0
6 MOA 2008-BLG-310 * 17 54 14.53 -34 46 41.0           GV 50 1
7 OGLE-2007-BLG-302 * 17 54 14.855 -31 11 02.65           GIII 5 0
8 MOA 2011-BLG-274 * 17 54 42.340 -28 54 59.26           GV 5 0
9 OGLE-2004-BLG-254 * 17 56 36.20 -32 33 01.8           KIII 3 0
10 OGLE-2003-BUL-262 * 17 57 08.51 -30 20 05.1           ~ 7 0
11 MOA 2010-BLG-523 RS* 17 57 08.870 -29 44 58.40           ~ 13 0
12 OGLE 2004-BUL-482 * 17 57 30.6268943160 -30 51 30.607919388         14.57 MIII 6 0
13 OGLE-2006-BLG-437 * 17 57 47.93 -29 50 44.3           ~ 2 0
14 OGLE-2007-BLG-050 * 17 58 19.39 -28 38 59.0           ~ 10 0
15 OGLE 2008-BUL-290 * 17 58 29.34 -27 59 22.4           K3III 6 0
16 OGLE-2008-BLG-279 * 17 58 36.17 -30 22 08.4           GV 20 0
17 MOA 2009-BLG-174 * 18 02 07.70 -31 25 26.4           FV 10 0
18 MOA 2010-BLG-436 * 18 03 21.680 -27 38 10.74           ~ 3 0
19 OGLE-2011-BLG-1101 * 18 03 31.590 -26 20 39.05           KIII 5 0
20 MOA 2007-BLG-176 * 18 05 00.407 -25 47 03.69           KIII 3 0
21 MOA 2010-BLG-311 * 18 08 49.980 -25 57 04.27           ~ 13 0
22 MOA 2007-BLG-400b Pl 18 09 41.980 -29 13 26.95           ~ 35 1
23 NAME Galactic Bulge reg ~ ~           ~ 4297 0

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