Full characterization of binary-lens event OGLE-2002-BLG-069 from PLANET observations

D  Kubas; A  Cassan; J P  Beaulieu; C  Coutures; M  Dominik; M D  Albrow; S  Brillant; J A R  Caldwell; D  Dominis; J  Donatowicz; C  Fendt; P  Fouque; U G  Jorgensen; J  Greenhill; K  Hill; J  Heinmuller; K  Horne; S  Kane; J B  Marquette; R  Martin; J  Menzies; K R  Pollard; K C  Sahu; C  Vinter; J  Wambsganss; R  Watson; A  Williams; C  Thurl

doi:10.1051/0004-6361:20042624

Full characterization of binary-lens event OGLE-2002-BLG-069 from PLANET observations

D Kubas, A Cassan, J P Beaulieu, C Coutures, M Dominik, M D Albrow, S Brillant, J A R Caldwell, D Dominis, J Donatowicz, C Fendt, P Fouque, U G Jorgensen, J Greenhill, K Hill, J Heinmuller, K Horne, S Kane, J B Marquette, R MartinJ Menzies, K R Pollard, K C Sahu, C Vinter, J Wambsganss, R Watson, A Williams, C Thurl

School of Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

Abstract

We analyze the photometric data obtained by PLANET and OGLE on the caustic-crossing binary-lens microlensing event OGLE-2002-BLG-069. Thanks to the excellent photometric and spectroscopic coverage of the event, we are able to constrain the lens model up to the known ambiguity between close and wide binary lenses. The detection of annual parallax in combination with measurements of extended-source effects allows us to determine the mass, distance and velocity of the lens components for the competing models. While the model involving a close binary lens leads to a Bulge-Disc lens scenario with a lens mass of M = (0.51 &PLUSMN; 0.15) M-&ODOT; and distance of D-L = (2.9 &PLUSMN; 0.4) kpc, the wide binary lens solution requires a rather implausible binary black-hole lens ( M &GSIM; 126 M-&ODOT;). Furthermore we compare current state-of-the-art numerical and empirical models for the surface brightness profile of the source, a G5III Bulge giant. We find that a linear limb-darkening model for the atmosphere of the source star is consistent with the data whereas a PHOENIX atmosphere model assuming LTE and with no free parameter does not match our observations.

Original language	English
Pages (from-to)	941-948
Number of pages	8
Journal	Astronomy & Astrophysics
Volume	435
DOIs	https://doi.org/10.1051/0004-6361:20042624
Publication status	Published - Jun 2005

Keywords

gravitational lensing
stars : atmospheres
stars : binaries : general
MICROLENSING FOLD CAUSTICS
LIMB-DARKENING MEASUREMENT
GRAVITATIONAL LENS
GALACTIC BULGE
STELLAR ATMOSPHERE
MAGNIFICATION
PHOTOMETRY
GIANT
STAR
RESOLUTION

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Kubas, D., Cassan, A., Beaulieu, J. P., Coutures, C., Dominik, M., Albrow, M. D., Brillant, S., Caldwell, J. A. R., Dominis, D., Donatowicz, J., Fendt, C., Fouque, P., Jorgensen, U. G., Greenhill, J., Hill, K., Heinmuller, J., Horne, K., Kane, S., Marquette, J. B., ... Thurl, C. (2005). Full characterization of binary-lens event OGLE-2002-BLG-069 from PLANET observations. Astronomy & Astrophysics, 435, 941-948. https://doi.org/10.1051/0004-6361:20042624

@article{2735af68924a4365b867d2b15a215054,

title = "Full characterization of binary-lens event OGLE-2002-BLG-069 from PLANET observations",

abstract = "We analyze the photometric data obtained by PLANET and OGLE on the caustic-crossing binary-lens microlensing event OGLE-2002-BLG-069. Thanks to the excellent photometric and spectroscopic coverage of the event, we are able to constrain the lens model up to the known ambiguity between close and wide binary lenses. The detection of annual parallax in combination with measurements of extended-source effects allows us to determine the mass, distance and velocity of the lens components for the competing models. While the model involving a close binary lens leads to a Bulge-Disc lens scenario with a lens mass of M = (0.51 &PLUSMN; 0.15) M-&ODOT; and distance of D-L = (2.9 &PLUSMN; 0.4) kpc, the wide binary lens solution requires a rather implausible binary black-hole lens ( M &GSIM; 126 M-&ODOT;). Furthermore we compare current state-of-the-art numerical and empirical models for the surface brightness profile of the source, a G5III Bulge giant. We find that a linear limb-darkening model for the atmosphere of the source star is consistent with the data whereas a PHOENIX atmosphere model assuming LTE and with no free parameter does not match our observations.",

keywords = "gravitational lensing, stars : atmospheres, stars : binaries : general, MICROLENSING FOLD CAUSTICS, LIMB-DARKENING MEASUREMENT, GRAVITATIONAL LENS, GALACTIC BULGE, STELLAR ATMOSPHERE, MAGNIFICATION, PHOTOMETRY, GIANT, STAR, RESOLUTION",

author = "D Kubas and A Cassan and Beaulieu, {J P} and C Coutures and M Dominik and Albrow, {M D} and S Brillant and Caldwell, {J A R} and D Dominis and J Donatowicz and C Fendt and P Fouque and Jorgensen, {U G} and J Greenhill and K Hill and J Heinmuller and K Horne and S Kane and Marquette, {J B} and R Martin and J Menzies and Pollard, {K R} and Sahu, {K C} and C Vinter and J Wambsganss and R Watson and A Williams and C Thurl",

year = "2005",

month = jun,

doi = "10.1051/0004-6361:20042624",

language = "English",

volume = "435",

pages = "941--948",

journal = "Astronomy & Astrophysics",

issn = "0004-6361",

publisher = "EDP SCIENCES S A",

}

Kubas, D, Cassan, A, Beaulieu, JP, Coutures, C, Dominik, M, Albrow, MD, Brillant, S, Caldwell, JAR, Dominis, D, Donatowicz, J, Fendt, C, Fouque, P, Jorgensen, UG, Greenhill, J, Hill, K, Heinmuller, J, Horne, K, Kane, S, Marquette, JB, Martin, R, Menzies, J, Pollard, KR, Sahu, KC, Vinter, C, Wambsganss, J, Watson, R, Williams, A & Thurl, C 2005, 'Full characterization of binary-lens event OGLE-2002-BLG-069 from PLANET observations', Astronomy & Astrophysics, vol. 435, pp. 941-948. https://doi.org/10.1051/0004-6361:20042624

TY - JOUR

T1 - Full characterization of binary-lens event OGLE-2002-BLG-069 from PLANET observations

AU - Kubas, D

AU - Cassan, A

AU - Beaulieu, J P

AU - Coutures, C

AU - Dominik, M

AU - Albrow, M D

AU - Brillant, S

AU - Caldwell, J A R

AU - Dominis, D

AU - Donatowicz, J

AU - Fendt, C

AU - Fouque, P

AU - Jorgensen, U G

AU - Greenhill, J

AU - Hill, K

AU - Heinmuller, J

AU - Horne, K

AU - Kane, S

AU - Marquette, J B

AU - Martin, R

AU - Menzies, J

AU - Pollard, K R

AU - Sahu, K C

AU - Vinter, C

AU - Wambsganss, J

AU - Watson, R

AU - Williams, A

AU - Thurl, C

PY - 2005/6

Y1 - 2005/6

N2 - We analyze the photometric data obtained by PLANET and OGLE on the caustic-crossing binary-lens microlensing event OGLE-2002-BLG-069. Thanks to the excellent photometric and spectroscopic coverage of the event, we are able to constrain the lens model up to the known ambiguity between close and wide binary lenses. The detection of annual parallax in combination with measurements of extended-source effects allows us to determine the mass, distance and velocity of the lens components for the competing models. While the model involving a close binary lens leads to a Bulge-Disc lens scenario with a lens mass of M = (0.51 &PLUSMN; 0.15) M-&ODOT; and distance of D-L = (2.9 &PLUSMN; 0.4) kpc, the wide binary lens solution requires a rather implausible binary black-hole lens ( M &GSIM; 126 M-&ODOT;). Furthermore we compare current state-of-the-art numerical and empirical models for the surface brightness profile of the source, a G5III Bulge giant. We find that a linear limb-darkening model for the atmosphere of the source star is consistent with the data whereas a PHOENIX atmosphere model assuming LTE and with no free parameter does not match our observations.

AB - We analyze the photometric data obtained by PLANET and OGLE on the caustic-crossing binary-lens microlensing event OGLE-2002-BLG-069. Thanks to the excellent photometric and spectroscopic coverage of the event, we are able to constrain the lens model up to the known ambiguity between close and wide binary lenses. The detection of annual parallax in combination with measurements of extended-source effects allows us to determine the mass, distance and velocity of the lens components for the competing models. While the model involving a close binary lens leads to a Bulge-Disc lens scenario with a lens mass of M = (0.51 &PLUSMN; 0.15) M-&ODOT; and distance of D-L = (2.9 &PLUSMN; 0.4) kpc, the wide binary lens solution requires a rather implausible binary black-hole lens ( M &GSIM; 126 M-&ODOT;). Furthermore we compare current state-of-the-art numerical and empirical models for the surface brightness profile of the source, a G5III Bulge giant. We find that a linear limb-darkening model for the atmosphere of the source star is consistent with the data whereas a PHOENIX atmosphere model assuming LTE and with no free parameter does not match our observations.

KW - gravitational lensing

KW - stars : atmospheres

KW - stars : binaries : general

KW - MICROLENSING FOLD CAUSTICS

KW - LIMB-DARKENING MEASUREMENT

KW - GRAVITATIONAL LENS

KW - GALACTIC BULGE

KW - STELLAR ATMOSPHERE

KW - MAGNIFICATION

KW - PHOTOMETRY

KW - GIANT

KW - STAR

KW - RESOLUTION

UR - http://www.scopus.com/inward/record.url?scp=21144452807&partnerID=8YFLogxK

U2 - 10.1051/0004-6361:20042624

DO - 10.1051/0004-6361:20042624

M3 - Article

SN - 0004-6361

VL - 435

SP - 941

EP - 948

JO - Astronomy & Astrophysics

JF - Astronomy & Astrophysics

ER -

Full characterization of binary-lens event OGLE-2002-BLG-069 from PLANET observations

Abstract

Keywords

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