2012MNRAS.424..902B

Query : 2012MNRAS.424..902B

2012MNRAS.424..902B - Mon. Not. R. Astron. Soc., 424, 902-918 (2012/August-1)

OGLE-2008-BLG-510: first automated real-time detection of a weak microlensing anomaly – brown dwarf or stellar binary?

BOZZA V., DOMINIK M., RATTENBURY N.J., JORGENSEN U.G., TSAPRAS Y., BRAMICH D.M., UDALSKI A., BOND I.A., LIEBIG C., CASSAN A., FOUQUE P., FUKUI A., HUNDERTMARK M., SHIN I.-G., LEE S.H., CHOI J.-Y., PARK S.-Y., GOULD A., ALLAN A., MAO S., WYRZYKOWSKI L., STREET R.A., BUCKLEY D., NAGAYAMA T., MATHIASEN M., HINSE T.C., CALCHI NOVATI S., HARPSOE K., MANCINI L., SCARPETTA G., ANGUITA T., BURGDORF M.J., HORNE K., HORNSTRUP A., KAINS N., KERINS E., KJAERGAARD P., MASI G., RAHVAR S., RICCI D., SNODGRASS C., SOUTHWORTH J., STEELE I.A., SURDEJ J., THONE C.C., WAMBSGANSS J., ZUB M., ALBROW M.D., BATISTA V., BEAULIEU J.-P., BENNETT D.P., CALDWELL J.A.R., COLE A.A., COOK K.H., COUTURES C., DIETERS S., DOMINIS PRESTER D., DONATOWICZ J., GREENHILL J., KANE S.R., KUBAS D., MARQUETTE J.-B., MARTIN R., MENZIES J., POLLARD K.R., SAHU K.C., WILLIAMS A., SZYMANSKI M.K., KUBIAK M., PIETRZYNSKI G., SOSZYNSKI I., POLESKI R., ULACZYK K., DEPOY D.L., DONG S., HAN C., JANCZAK J., LEE C.-U., POGGE R.W., ABE F., FURUSAWA K., HEARNSHAW J.B., ITOW Y., KILMARTIN P.M., KORPELA A.V., LIN W., LING C.H., MASUDA K., MATSUBARA Y., MIYAKE N., MURAKI Y., OHNISHI K., PERROTT Y.C., SAITO T., SKULJAN L., SULLIVAN D.J., SUMI T., SUZUKI D., SWEATMAN W.L., TRISTRAM P.J., WADA K., YOCK P.C.M., GULBIS A., HASHIMOTO Y., KNIAZEV A. and VAISANEN P.

Abstract (from CDS):

The microlensing event OGLE-2008-BLG-510 is characterized by an evident asymmetric shape of the peak, promptly detected by the Automated Robotic Terrestrial Exoplanet Microlensing Search (ARTEMiS) system in real time. The skewness of the light curve appears to be compatible both with binary-lens and binary-source models, including the possibility that the lens system consists of an M dwarf orbited by a brown dwarf. The detection of this microlensing anomaly and our analysis demonstrate that: (1) automated real-time detection of weak microlensing anomalies with immediate feedback is feasible, efficient and sensitive, (2) rather common weak features intrinsically come with ambiguities that are not easily resolved from photometric light curves, (3) a modelling approach that finds all features of parameter space rather than just the `favourite model' is required and (4) the data quality is most crucial, where systematics can be confused with real features, in particular small higher order effects such as orbital motion signatures. It moreover becomes apparent that events with weak signatures are a silver mine for statistical studies, although not easy to exploit. Clues about the apparent paucity of both brown-dwarf companions and binary-source microlensing events might hide here.

Based in part on data collected by MiNDSTEp with the Danish 1.54m telescope at the ESO La Silla Observatory.

Abstract Copyright: 2012 The Authors Monthly Notices of the Royal Astronomical Society2012 RAS

Journal keyword(s): gravitational lensing: micro - planetary systems

Simbad objects: 9

Full paper

View the references in ADS

Number of rows : 9

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Sp type	#ref 1850 - 2026	#notes
1	NAME Galactic Center	reg	17 45 39.60213	-29 00 22.0000	~	16269	0
2	MOA 2009-BLG-266b	Pl	17 48 05.950	-35 00 19.48	~	16	1
3	OGLE-2007-BLG-302	*	17 54 14.855	-31 11 02.65	GIII	5	0
4	NAME EWS 2005-BLG-390b	Pl	17 54 19.2	-30 22 38	~	80	1
5	MOA 2007-BLG-308	*	17 56 25.96	-32 14 14.7	GV	25	1
6	OGLE-2007-BLG-355	*	17 59 01.751	-27 32 33.28	~	3	0
7	OGLE-2002-BUL-055	PN	17 59 40.93	-27 07 18.2	~	13	0
8	OGLE-2009-BLG-510	*	18 09 37.65	-26 02 26.7	~	7	0
9	NAME Galactic Bulge	reg	~	~	~	4794	0

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