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

21 Citations (Scopus)

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

Access to Document

10.1051/0004-6361/200912923

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

Cite this

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 S A",

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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