2009A&A...508..467B

C.D.S. - SIMBAD4 rel 1.7 - 2021.04.20CEST21:53:21

2009A&A...508..467B - Astronomy and Astrophysics, volume 508, 467-478 (2009/12-2)

Mass measurement of a single unseen star and planetary detection efficiency. for OGLE 2007-BLG-050.

BATISTA V., DONG S., GOULD A., BEAULIEU J.P., CASSAN A., CHRISTIE G.W., HAN C., UDALSKI A., ALLEN W., DEPOY D.L., GAL-YAM A., GAUDI B.S., JOHNSON B., KASPI S., LEE C.U., MAOZ D., McCORMICK J., McGREER I., MONARD B., NATUSCH T., OFEK E., PARK B.-G., POGGE R.W., POLISHOOK D., SHPORER A., ALBROW M.D., BENNETT D.P., BRILLANT S., BODE M., BRAMICH D.M., BURGDORF M., CALDWELL J.A.R., CALITZ H., COLE A., COOK K.H., COUTURES C., DIETERS S., DOMINIK M., DOMINIS PRESTER D., DONATOWICZ J., FOUQUE P., GREENHILL J., HOFFMAN M., HORNE K., JORGENSEN U.G., KAINS N., KANE S., KUBAS D., MARQUETTE J.B., MARTIN R., MEINTJES P., MENZIES J., POLLARD K.R., SAHU K.C., SNODGRASS C., STEELE I., TSAPRAS Y., WAMBSGANSS J., WILLIAMS A., ZUB M., WYRZYKOWSKI L., KUBIAK M., SZYMANSKI M.K., PIETRZYNSKI G., SOSZYNSKI I., SZEWCZYK O., ULACZYK K., ABE F., BOND I.A., FUKUI A., FURUSAWA K., HEARNSHAW J.B., HOLDERNESS S., ITOW Y., KAMIYA K., KILMARTIN P.M., KORPELA A., LIN W., LING C.H., MASUDA K., MATSUBARA Y., MIYAKE N., MURAKI Y., NAGAYA M., OHNISHI K., OKUMURA T., PERROTT Y.C., RATTENBURY N., SAITO T., SAKO T., SKULJAN L., SULLIVAN D., SUMI T., SWEATMAN W.L., TRISTRAM P.J. and YOCK P.C.M.

Abstract (from CDS):

We analyze OGLE-2007-BLG-050, a high magnification microlensing event (A∼432) whose peak occurred on 2 May, 2007, with pronounced finite-source and parallax effects. We compute planet detection efficiencies for this event in order to determine its sensitivity to the presence of planets around the lens star. Both finite-source and parallax effects permit a measurement of the angular Einstein radius θ_E=0.48±0.01mas and the parallax π_E=0.12±0.03, leading to an estimate of the lens mass M=0.50±0.14M_☉ and its distance to the observer D_L=5.5±0.4kpc. This is only the second determination of a reasonably precise (<30%) mass estimate for an isolated unseen object, using any method. This allows us to calculate the planetary detection efficiency in physical units (r_{{perpendicular}},m_p), where r_{{perpendicular}} is the projected planet-star separation and m_p is the planet mass. When computing planet detection efficiency, we did not find any planetary signature, i.e. none of the planetary configurations provides a Δχ² improvement higher than 60, and our detection efficiency results reveal significant sensitivity to Neptune-mass planets, and to a lesser extent Earth-mass planets in some configurations. Indeed, Jupiter and Neptune-mass planets are excluded with a high confidence for a large projected separation range between the planet and the lens star, respectively [0.6-10] and [1.4-4]AU, and Earth-mass planets are excluded with a 10% confidence in the lensing zone, i.e. [1.8-3.1]AU.

Abstract Copyright: ∼

Journal keyword(s): gravitational lensing - techniques: photometric - stars: individual: OGLE 2007-BLG-050 - planetary systems

CDS comments: Paragraphe 1.2 OGLE 2007-BLG-071 is a probable misprint for EWS 2005-BLG-71. OGLE 2003-BLG-267 is EWS 2003-BUL-170 in Jaroszynski et al. 2005.

Simbad objects: 17

Full paper

View the reference in ADS

Number of rows : 17

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag V	Mag I	Sp type	#ref 1850 - 2021	#notes
1	MACHO LMC 5	Lev	05 16 41.1	-70 29 18	21.15		~	61	1
2	EWS 2007-BLG-224	BD*	08 05 41.0	-28 45 36			FV	21	0
3	EWS 2003-BLG-423	Lev	16 00.9	-28 25			~	4	0
4	EWS 2002-BUL-69	Lev	17 48 01.00	-21 16 09.3			G5III	17	0
5	OGLE BUL-SC44 17823	*	17 49 01.66	-30 15 40.4			~	6	0
6	EWS 2005-BLG-71	*	17 50 09.77	-34 40 23.5			~	48	1
7	EWS 2006-BLG-109	*	17 52 34.55	-30 05 15.7	19.035	16.643	~	68	2
8	EROS BLG 2000 5	*	17 53 11.43	-30 55 34.4			K3III	36	0
9	EWS 2007-BLG-50	Lev	17 58 19.39	-28 38 59.0			~	9	0
10	EWS 2003-BUL-170	Lev	18 00 06.93	-29 08 41.3			~	3	0
11	MOA 2003-BLG-53	*	18 05 16.35	-28 53 42.0			GIV	51	1
12	MOA 2003-BLG-32	Lev	18 05 34.64	-29 06 53.6			~	8	0
13	OGLE BUL-SC18 594723	*	18 07 20.83	-27 34 10.8			~	6	0
14	EWS 2004-BLG-343	Lev	18 08 46.43	-27 01 56.5			~	6	0
15	MOA 2007-BLG-400b	Pl	18 09 41.980	-29 13 26.95			~	30	1
16	MOA 2007-BLG-400	*	18 09 41.980	-29 13 26.95			~	34	1
17	MACHO 98-BLG-35	Lev	18 17 16.3	-22 01 18	20.7		~	23	0

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