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

V. Batista; S. Dong; A. Gould; J. P. Beaulieu; A. Cassan; G. W. Christie; C. Han; A. Udalski; W. Allen; D. L. DePoy; A. Gal-Yam; B. S. Gaudi; B. Johnson; S. Kaspi; C. U. Lee; D. Maoz; J. McCormick; I. McGreer; B. Monard; T. Natusch; E. Ofek; B.-G. Park; R. W. Pogge; D. Polishook; A. Shporer; M. D. Albrow; D. P. Bennett; S. Brillant; M. Bode; D. M. Bramich; M. Burgdorf; J. A. R. Caldwell; H. Calitz; A. Cole; K. H. Cook; Ch. Coutures; S. Dieters; M. Dominik; D. D. Prester; J. Donatowicz; P. Fouque; J. Greenhill; M. Hoffman; K. Horne; U. G. Jorgensen; N. Kains; S. Kane; D. Kubas; R. Martin; Y. Tsapras; μFUN Collaboration; PLANET RoboNet Collaboration; OGLE Collaboration; MOA Collaboration

doi:10.1051/0004-6361/200912923

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

V. Batista^*, S. Dong, A. Gould, J. P. Beaulieu, A. Cassan, G. W. Christie, C. Han, A. Udalski, W. Allen, D. L. DePoy, A. Gal-Yam, B. S. Gaudi, B. Johnson, S. Kaspi, C. U. Lee, D. Maoz, J. McCormick, I. McGreer, B. Monard, T. NatuschE. Ofek, B.-G. Park, R. W. Pogge, D. Polishook, A. Shporer, M. D. Albrow, D. P. Bennett, S. Brillant, M. Bode, D. M. Bramich, M. Burgdorf, J. A. R. Caldwell, H. Calitz, A. Cole, K. H. Cook, Ch. Coutures, S. Dieters, M. Dominik, D. D. Prester, J. Donatowicz, P. Fouque, J. Greenhill, M. Hoffman, K. Horne, U. G. Jorgensen, N. Kains, S. Kane, D. Kubas, R. Martin, Y. Tsapras, μFUN Collaboration, PLANET RoboNet Collaboration, OGLE Collaboration, MOA Collaboration

^*Corresponding author for this work

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

Abstract

Aims. We analyze OGLE-2007-BLG-050, a high magnification microlensing event (A similar to 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.

Methods. Both finite-source and parallax effects permit a measurement of the angular Einstein radius theta(E) = 0.48 +/- 0.01 mas and the parallax pi(E) = 0.12 +/- 0.03, leading to an estimate of the lens mass M = 0.50 +/- 0.14 M(circle dot) and its distance to the observer D(L) = 5.5 +/- 0.4 kpc. This is only the second determination of a reasonably precise (

Results. When computing planet detection efficiency, we did not find any planetary signature, i.e. none of the planetary configurations provides a Delta chi(2) 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.

Original language	English
Pages (from-to)	467-478
Number of pages	12
Journal	Astronomy & Astrophysics
Volume	508
Issue number	1
DOIs	https://doi.org/10.1051/0004-6361/200912923
Publication status	Published - Dec 2009

Keywords

gravitational lensing
techniques: photometric
stars: individual: OGLE 2007-BLG-050
planetary systems
GRAVITATIONAL LENSING EXPERIMENT
PARALLAX MICROLENSING EVENT
LARGE-MAGELLANIC-CLOUD
HIGH-MAGNIFICATION
GALACTIC BULGE
EXTRASOLAR PLANETS
BROWN DWARF
THICK-DISK
COMPANIONS
PHOTOMETRY

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10.1051/0004-6361/200912923

Astrophysics in St Andrews: Astrophysics in St Andrews / SUPA (Continuan of Rolling Grant - XPP089
Bonnell, I. (PI), Cameron, A. (CoI), Dominik, M. (CoI), Driver, S. (CoI), Greaves, J. (CoI), Horne, K. (CoI), Jardine, M. (CoI), Wood, K. (CoI) & Zhao, H. (CoI)
Science & Technology Facilities Council
1/04/09 → 31/03/12
Project: Standard

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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., ... MOA Collaboration (2009). Mass measurement of a single unseen star and planetary detection efficiency for OGLE 2007-BLG-050. Astronomy & Astrophysics, 508(1), 467-478. https://doi.org/10.1051/0004-6361/200912923

@article{fc5df66587054cada92b336d0a098575,

title = "Mass measurement of a single unseen star and planetary detection efficiency for OGLE 2007-BLG-050",

abstract = "Aims. We analyze OGLE-2007-BLG-050, a high magnification microlensing event (A similar to 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.Methods. Both finite-source and parallax effects permit a measurement of the angular Einstein radius theta(E) = 0.48 +/- 0.01 mas and the parallax pi(E) = 0.12 +/- 0.03, leading to an estimate of the lens mass M = 0.50 +/- 0.14 M(circle dot) and its distance to the observer D(L) = 5.5 +/- 0.4 kpc. This is only the second determination of a reasonably precise (Results. When computing planet detection efficiency, we did not find any planetary signature, i.e. none of the planetary configurations provides a Delta chi(2) 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.",

keywords = "gravitational lensing, techniques: photometric, stars: individual: OGLE 2007-BLG-050, planetary systems, GRAVITATIONAL LENSING EXPERIMENT, PARALLAX MICROLENSING EVENT, LARGE-MAGELLANIC-CLOUD, HIGH-MAGNIFICATION, GALACTIC BULGE, EXTRASOLAR PLANETS, BROWN DWARF, THICK-DISK, COMPANIONS, PHOTOMETRY",

author = "V. Batista and S. Dong and A. Gould and Beaulieu, {J. P.} and A. Cassan and Christie, {G. W.} and C. Han and A. Udalski and W. Allen and DePoy, {D. L.} and A. Gal-Yam and Gaudi, {B. S.} and B. Johnson and S. Kaspi and Lee, {C. U.} and D. Maoz and J. McCormick and I. McGreer and B. Monard and T. Natusch and E. Ofek and B.-G. Park and Pogge, {R. W.} and D. Polishook and A. Shporer and Albrow, {M. D.} and Bennett, {D. P.} and S. Brillant and M. Bode and Bramich, {D. M.} and M. Burgdorf and Caldwell, {J. A. R.} and H. Calitz and A. Cole and Cook, {K. H.} and Ch. Coutures and S. Dieters and M. Dominik and Prester, {D. D.} and J. Donatowicz and P. Fouque and J. Greenhill and M. Hoffman and K. Horne and Jorgensen, {U. G.} and N. Kains and S. Kane and D. Kubas and R. Martin and Y. Tsapras and {μFUN Collaboration} and {PLANET RoboNet Collaboration} and {OGLE Collaboration} and {MOA Collaboration}",

year = "2009",

month = dec,

doi = "10.1051/0004-6361/200912923",

language = "English",

volume = "508",

pages = "467--478",

journal = "Astronomy & Astrophysics",

issn = "0004-6361",

publisher = "EDP Sciences",

number = "1",

}

Batista, V, Dong, S, Gould, A, Beaulieu, JP, Cassan, A, Christie, GW, Han, C, Udalski, A, Allen, W, DePoy, DL, Gal-Yam, A, Gaudi, BS, Johnson, B, Kaspi, S, Lee, CU, Maoz, D, McCormick, J, McGreer, I, Monard, B, Natusch, T, Ofek, E, Park, B-G, Pogge, RW, Polishook, D, Shporer, A, Albrow, MD, Bennett, DP, Brillant, S, Bode, M, Bramich, DM, Burgdorf, M, Caldwell, JAR, Calitz, H, Cole, A, Cook, KH, Coutures, C, Dieters, S, Dominik, M, Prester, DD, Donatowicz, J, Fouque, P, Greenhill, J, Hoffman, M, Horne, K, Jorgensen, UG, Kains, N, Kane, S, Kubas, D, Martin, R, Tsapras, Y, μFUN Collaboration, PLANET RoboNet Collaboration, OGLE Collaboration & MOA Collaboration 2009, 'Mass measurement of a single unseen star and planetary detection efficiency for OGLE 2007-BLG-050', Astronomy & Astrophysics, vol. 508, no. 1, pp. 467-478. https://doi.org/10.1051/0004-6361/200912923

TY - JOUR

T1 - Mass measurement of a single unseen star and planetary detection efficiency for OGLE 2007-BLG-050

AU - Batista, V.

AU - Dong, S.

AU - Gould, A.

AU - Beaulieu, J. P.

AU - Cassan, A.

AU - Christie, G. W.

AU - Han, C.

AU - Udalski, A.

AU - Allen, W.

AU - DePoy, D. L.

AU - Gal-Yam, A.

AU - Gaudi, B. S.

AU - Johnson, B.

AU - Kaspi, S.

AU - Lee, C. U.

AU - Maoz, D.

AU - McCormick, J.

AU - McGreer, I.

AU - Monard, B.

AU - Natusch, T.

AU - Ofek, E.

AU - Park, B.-G.

AU - Pogge, R. W.

AU - Polishook, D.

AU - Shporer, A.

AU - Albrow, M. D.

AU - Bennett, D. P.

AU - Brillant, S.

AU - Bode, M.

AU - Bramich, D. M.

AU - Burgdorf, M.

AU - Caldwell, J. A. R.

AU - Calitz, H.

AU - Cole, A.

AU - Cook, K. H.

AU - Coutures, Ch.

AU - Dieters, S.

AU - Dominik, M.

AU - Prester, D. D.

AU - Donatowicz, J.

AU - Fouque, P.

AU - Greenhill, J.

AU - Hoffman, M.

AU - Horne, K.

AU - Jorgensen, U. G.

AU - Kains, N.

AU - Kane, S.

AU - Kubas, D.

AU - Martin, R.

AU - Tsapras, Y.

AU - μFUN Collaboration

AU - PLANET RoboNet Collaboration

AU - OGLE Collaboration

AU - MOA Collaboration

PY - 2009/12

Y1 - 2009/12

N2 - Aims. We analyze OGLE-2007-BLG-050, a high magnification microlensing event (A similar to 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.Methods. Both finite-source and parallax effects permit a measurement of the angular Einstein radius theta(E) = 0.48 +/- 0.01 mas and the parallax pi(E) = 0.12 +/- 0.03, leading to an estimate of the lens mass M = 0.50 +/- 0.14 M(circle dot) and its distance to the observer D(L) = 5.5 +/- 0.4 kpc. This is only the second determination of a reasonably precise (Results. When computing planet detection efficiency, we did not find any planetary signature, i.e. none of the planetary configurations provides a Delta chi(2) 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.

AB - Aims. We analyze OGLE-2007-BLG-050, a high magnification microlensing event (A similar to 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.Methods. Both finite-source and parallax effects permit a measurement of the angular Einstein radius theta(E) = 0.48 +/- 0.01 mas and the parallax pi(E) = 0.12 +/- 0.03, leading to an estimate of the lens mass M = 0.50 +/- 0.14 M(circle dot) and its distance to the observer D(L) = 5.5 +/- 0.4 kpc. This is only the second determination of a reasonably precise (Results. When computing planet detection efficiency, we did not find any planetary signature, i.e. none of the planetary configurations provides a Delta chi(2) 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.

KW - gravitational lensing

KW - techniques: photometric

KW - stars: individual: OGLE 2007-BLG-050

KW - planetary systems

KW - GRAVITATIONAL LENSING EXPERIMENT

KW - PARALLAX MICROLENSING EVENT

KW - LARGE-MAGELLANIC-CLOUD

KW - HIGH-MAGNIFICATION

KW - GALACTIC BULGE

KW - EXTRASOLAR PLANETS

KW - BROWN DWARF

KW - THICK-DISK

KW - COMPANIONS

KW - PHOTOMETRY

U2 - 10.1051/0004-6361/200912923

DO - 10.1051/0004-6361/200912923

M3 - Article

SN - 0004-6361

VL - 508

SP - 467

EP - 478

JO - Astronomy & Astrophysics

JF - Astronomy & Astrophysics

IS - 1

ER -

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

Abstract

Keywords

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Projects

Astrophysics in St Andrews: Astrophysics in St Andrews / SUPA (Continuan of Rolling Grant - XPP089

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