OGLE 2008-BLG-290: an accurate measurement of the limb darkening of a galactic bulge K Giant spatially resolved by microlensing

P. Fouque; D. Heyrovsky; S. Dong; A. Gould; A. Udalski; M. D. Albrow; V. Batista; J. -P. Beaulieu; D. P. Bennett; I. A. Bond; D. M. Bramich; S. Calchi Novati; A. Cassan; C. Coutures; S. Dieters; M. Dominik; D. Dominis Prester; J. Greenhill; K. Horne; U. G. Jorgensen; S. Kozlowski; D. Kubas; C. -H. Lee; J. -B. Marquette; M. Mathiasen; J. Menzies; L. A. G. Monard; S. Nishiyama; I. Papadakis; R. Street; T. Sumi; A. Williams; J. C. Yee; S. Brillant; J. A. R. Caldwell; A. Cole; K. H. Cook; J. Donatowicz; N. Kains; S. R. Kane; R. Martin; K. R. Pollard; K. C. Sahu; Y. Tsapras; J. Wambsganss; M. Zub; D. L. DePoy; B. S. Gaudi; C. Han; C. -U. Lee; B. -G. Park; R. W. Pogge; M. Kubiak; M. K. Szymanski; G. Pietrzynski; I. Soszynski; O. Szewczyk; K. Ulaczyk; L. Wyrzykowski; F. Abe; A. Fukui; K. Furusawa; A. C. Gilmore; J. B. Hearnshaw; Y. Itow; K. Kamiya; P. M. Kilmartin; A. V. Korpela; W. Lin; C. H. Ling; K. Masuda; Y. Matsubara; N. Miyake; Y. Muraki; M. Nagaya; K. Ohnishi; T. Okumura; Y. Perrott; N. J. Rattenbury; To Saito; T. Sako; S. Sato; L. Skuljan; D. Sullivan; W. Sweatman; P. J. Tristram; P. C. M. Yock; A. Allan; M. F. Bode; M. J. Burgdorf; N. Clay; S. N. Fraser; E. Hawkins; E. Kerins; T. A. Lister; C. J. Mottram; E. S. Saunders; C. Snodgrass; I. A. Steele; P. J. Wheatley; T. Anguita; V. Bozza; K. Harpsoe; T. C. Hinse; M. Hundertmark; P. Kjaergaard; C. Liebig; L. Mancini; G. Masi; S. Rahvar; D. Ricci; G. Scarpetta; J. Southworth; J. Surdej; C. C. Thone; A. Riffeser; S. Seitz; R. Bender

doi:10.1051/0004-6361/201014053

OGLE 2008-BLG-290: an accurate measurement of the limb darkening of a galactic bulge K Giant spatially resolved by microlensing

P. Fouque, D. Heyrovsky, S. Dong, A. Gould, A. Udalski, M. D. Albrow, V. Batista, J. -P. Beaulieu, D. P. Bennett, I. A. Bond, D. M. Bramich, S. Calchi Novati, A. Cassan, C. Coutures, S. Dieters, M. Dominik, D. Dominis Prester, J. Greenhill, K. Horne, U. G. JorgensenS. Kozlowski, D. Kubas, C. -H. Lee, J. -B. Marquette, M. Mathiasen, J. Menzies, L. A. G. Monard, S. Nishiyama, I. Papadakis, R. Street, T. Sumi, A. Williams, J. C. Yee, S. Brillant, J. A. R. Caldwell, A. Cole, K. H. Cook, J. Donatowicz, N. Kains, S. R. Kane, R. Martin, K. R. Pollard, K. C. Sahu, Y. Tsapras, J. Wambsganss, M. Zub, D. L. DePoy, B. S. Gaudi, C. Han, C. -U. Lee, B. -G. Park, R. W. Pogge, M. Kubiak, M. K. Szymanski, G. Pietrzynski, I. Soszynski, O. Szewczyk, K. Ulaczyk, L. Wyrzykowski, F. Abe, A. Fukui, K. Furusawa, A. C. Gilmore, J. B. Hearnshaw, Y. Itow, K. Kamiya, P. M. Kilmartin, A. V. Korpela, W. Lin, C. H. Ling, K. Masuda, Y. Matsubara, N. Miyake, Y. Muraki, M. Nagaya, K. Ohnishi, T. Okumura, Y. Perrott, N. J. Rattenbury, To Saito, T. Sako, S. Sato, L. Skuljan, D. Sullivan, W. Sweatman, P. J. Tristram, P. C. M. Yock, A. Allan, M. F. Bode, M. J. Burgdorf, N. Clay, S. N. Fraser, E. Hawkins, E. Kerins, T. A. Lister, C. J. Mottram, E. S. Saunders, C. Snodgrass, I. A. Steele, P. J. Wheatley, T. Anguita, V. Bozza, K. Harpsoe, T. C. Hinse, M. Hundertmark, P. Kjaergaard, C. Liebig, L. Mancini, G. Masi, S. Rahvar, D. Ricci, G. Scarpetta, J. Southworth, J. Surdej, C. C. Thone, A. Riffeser, S. Seitz, R. Bender

School of Physics and Astronomy

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

Abstract

Context. Not only is gravitational microlensing a successful tool for discovering distant exoplanets, but it also enables characterization of the lens and source stars involved in the lensing event. Aims. In high-magnification events, the lens caustic may cross over the source disk, which allows determination of the angular size of the source and measurement of its limb darkening.

Methods. When such extended-source effects appear close to maximum magnification, the resulting light curve differs from the characteristic Paczy ' nski point-source curve. The exact shape of the light curve close to the peak depends on the limb darkening of the source. Dense photometric coverage permits measurement of the respective limb-darkening coefficients.

Results. In the case of the microlensing event OGLE 2008-BLG-290, the K giant source star reached a peak magnification at about 100. Thirteen different telescopes have covered this event in eight different photometric bands. Subsequent light-curve analysis yielded measurements of linear limb-darkening coefficients of the source in six photometric bands. The best-measured coefficients lead to an estimate of the source effective temperature of about 4700(-200)(+100) K. However, the photometric estimate from colour-magnitude diagrams favours a cooler temperature of 4200 +/- 100 K.

Conclusions. Because the limb-darkening measurements, at least in the CTIO/SMARTS2 V-s- and I-s-bands, are among the most accurate obtained, the above disagreement needs to be understood. A solution is proposed, which may apply to previous events where such a discrepancy also appeared.

Original language	English
Article number	A51
Number of pages	12
Journal	Astronomy & Astrophysics
Volume	518
DOIs	https://doi.org/10.1051/0004-6361/201014053
Publication status	Published - Jul 2010

Keywords

gravitational lensing: micro
techniques: high angular resolution
stars: atmospheres
stars: individual: OGLE 2008-BLG-290
DETACHED ECLIPSING BINARIES
INTERSTELLAR EXTINCTION LAW
STELLAR ATMOSPHERE MODELS
DIFFERENCE IMAGE-ANALYSIS
JOVIAN-MASS PLANET
RED CLUMP STARS
EVENT MOA-2007-BLG-192
HIGH-MAGNIFICATION
PHOTOMETRY
LENS

Access to Document

10.1051/0004-6361/201014053

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

Fouque, P., Heyrovsky, D., Dong, S., Gould, A., Udalski, A., Albrow, M. D., Batista, V., Beaulieu, J. .-P., Bennett, D. P., Bond, I. A., Bramich, D. M., Calchi Novati, S., Cassan, A., Coutures, C., Dieters, S., Dominik, M., Prester, D. D., Greenhill, J., Horne, K., ... Bender, R. (2010). OGLE 2008-BLG-290: an accurate measurement of the limb darkening of a galactic bulge K Giant spatially resolved by microlensing. Astronomy & Astrophysics, 518, Article A51. https://doi.org/10.1051/0004-6361/201014053

@article{852b329ffb2e4e5781787adce7a52cf2,

title = "OGLE 2008-BLG-290: an accurate measurement of the limb darkening of a galactic bulge K Giant spatially resolved by microlensing",

abstract = "Context. Not only is gravitational microlensing a successful tool for discovering distant exoplanets, but it also enables characterization of the lens and source stars involved in the lensing event. Aims. In high-magnification events, the lens caustic may cross over the source disk, which allows determination of the angular size of the source and measurement of its limb darkening.Methods. When such extended-source effects appear close to maximum magnification, the resulting light curve differs from the characteristic Paczy ' nski point-source curve. The exact shape of the light curve close to the peak depends on the limb darkening of the source. Dense photometric coverage permits measurement of the respective limb-darkening coefficients.Results. In the case of the microlensing event OGLE 2008-BLG-290, the K giant source star reached a peak magnification at about 100. Thirteen different telescopes have covered this event in eight different photometric bands. Subsequent light-curve analysis yielded measurements of linear limb-darkening coefficients of the source in six photometric bands. The best-measured coefficients lead to an estimate of the source effective temperature of about 4700(-200)(+100) K. However, the photometric estimate from colour-magnitude diagrams favours a cooler temperature of 4200 +/- 100 K.Conclusions. Because the limb-darkening measurements, at least in the CTIO/SMARTS2 V-s- and I-s-bands, are among the most accurate obtained, the above disagreement needs to be understood. A solution is proposed, which may apply to previous events where such a discrepancy also appeared.",

keywords = "gravitational lensing: micro, techniques: high angular resolution, stars: atmospheres, stars: individual: OGLE 2008-BLG-290, DETACHED ECLIPSING BINARIES, INTERSTELLAR EXTINCTION LAW, STELLAR ATMOSPHERE MODELS, DIFFERENCE IMAGE-ANALYSIS, JOVIAN-MASS PLANET, RED CLUMP STARS, EVENT MOA-2007-BLG-192, HIGH-MAGNIFICATION, PHOTOMETRY, LENS",

author = "P. Fouque and D. Heyrovsky and S. Dong and A. Gould and A. Udalski and Albrow, {M. D.} and V. Batista and Beaulieu, {J. -P.} and Bennett, {D. P.} and Bond, {I. A.} and Bramich, {D. M.} and {Calchi Novati}, S. and A. Cassan and C. Coutures and S. Dieters and M. Dominik and Prester, {D. Dominis} and J. Greenhill and K. Horne and Jorgensen, {U. G.} and S. Kozlowski and D. Kubas and Lee, {C. -H.} and Marquette, {J. -B.} and M. Mathiasen and J. Menzies and Monard, {L. A. G.} and S. Nishiyama and I. Papadakis and R. Street and T. Sumi and A. Williams and Yee, {J. C.} and S. Brillant and Caldwell, {J. A. R.} and A. Cole and Cook, {K. H.} and J. Donatowicz and N. Kains and Kane, {S. R.} and R. Martin and Pollard, {K. R.} and Sahu, {K. C.} and Y. Tsapras and J. Wambsganss and M. Zub and DePoy, {D. L.} and Gaudi, {B. S.} and C. Han and Lee, {C. -U.} and Park, {B. -G.} and Pogge, {R. W.} and M. Kubiak and Szymanski, {M. K.} and G. Pietrzynski and I. Soszynski and O. Szewczyk and K. Ulaczyk and L. Wyrzykowski and F. Abe and A. Fukui and K. Furusawa and Gilmore, {A. C.} and Hearnshaw, {J. B.} and Y. Itow and K. Kamiya and Kilmartin, {P. M.} and Korpela, {A. V.} and W. Lin and Ling, {C. H.} and K. Masuda and Y. Matsubara and N. Miyake and Y. Muraki and M. Nagaya and K. Ohnishi and T. Okumura and Y. Perrott and Rattenbury, {N. J.} and To Saito and T. Sako and S. Sato and L. Skuljan and D. Sullivan and W. Sweatman and Tristram, {P. J.} and Yock, {P. C. M.} and A. Allan and Bode, {M. F.} and Burgdorf, {M. J.} and N. Clay and Fraser, {S. N.} and E. Hawkins and E. Kerins and Lister, {T. A.} and Mottram, {C. J.} and Saunders, {E. S.} and C. Snodgrass and Steele, {I. A.} and Wheatley, {P. J.} and T. Anguita and V. Bozza and K. Harpsoe and Hinse, {T. C.} and M. Hundertmark and P. Kjaergaard and C. Liebig and L. Mancini and G. Masi and S. Rahvar and D. Ricci and G. Scarpetta and J. Southworth and J. Surdej and Thone, {C. C.} and A. Riffeser and S. Seitz and R. Bender",

year = "2010",

month = jul,

doi = "10.1051/0004-6361/201014053",

language = "English",

volume = "518",

journal = "Astronomy & Astrophysics",

issn = "0004-6361",

publisher = "EDP SCIENCES S A",

}

Fouque, P, Heyrovsky, D, Dong, S, Gould, A, Udalski, A, Albrow, MD, Batista, V, Beaulieu, J-P, Bennett, DP, Bond, IA, Bramich, DM, Calchi Novati, S, Cassan, A, Coutures, C, Dieters, S, Dominik, M, Prester, DD, Greenhill, J, Horne, K, Jorgensen, UG, Kozlowski, S, Kubas, D, Lee, C-H, Marquette, J-B, Mathiasen, M, Menzies, J, Monard, LAG, Nishiyama, S, Papadakis, I, Street, R, Sumi, T, Williams, A, Yee, JC, Brillant, S, Caldwell, JAR, Cole, A, Cook, KH, Donatowicz, J, Kains, N, Kane, SR, Martin, R, Pollard, KR, Sahu, KC, Tsapras, Y, Wambsganss, J, Zub, M, DePoy, DL, Gaudi, BS, Han, C, Lee, C-U, Park, B-G, Pogge, RW, Kubiak, M, Szymanski, MK, Pietrzynski, G, Soszynski, I, Szewczyk, O, Ulaczyk, K, Wyrzykowski, L, Abe, F, Fukui, A, Furusawa, K, Gilmore, AC, Hearnshaw, JB, Itow, Y, Kamiya, K, Kilmartin, PM, Korpela, AV, Lin, W, Ling, CH, Masuda, K, Matsubara, Y, Miyake, N, Muraki, Y, Nagaya, M, Ohnishi, K, Okumura, T, Perrott, Y, Rattenbury, NJ, Saito, T, Sako, T, Sato, S, Skuljan, L, Sullivan, D, Sweatman, W, Tristram, PJ, Yock, PCM, Allan, A, Bode, MF, Burgdorf, MJ, Clay, N, Fraser, SN, Hawkins, E, Kerins, E, Lister, TA, Mottram, CJ, Saunders, ES, Snodgrass, C, Steele, IA, Wheatley, PJ, Anguita, T, Bozza, V, Harpsoe, K, Hinse, TC, Hundertmark, M, Kjaergaard, P, Liebig, C, Mancini, L, Masi, G, Rahvar, S, Ricci, D, Scarpetta, G, Southworth, J, Surdej, J, Thone, CC, Riffeser, A, Seitz, S & Bender, R 2010, 'OGLE 2008-BLG-290: an accurate measurement of the limb darkening of a galactic bulge K Giant spatially resolved by microlensing', Astronomy & Astrophysics, vol. 518, A51. https://doi.org/10.1051/0004-6361/201014053

TY - JOUR

T1 - OGLE 2008-BLG-290: an accurate measurement of the limb darkening of a galactic bulge K Giant spatially resolved by microlensing

AU - Fouque, P.

AU - Heyrovsky, D.

AU - Dong, S.

AU - Gould, A.

AU - Udalski, A.

AU - Albrow, M. D.

AU - Batista, V.

AU - Beaulieu, J. -P.

AU - Bennett, D. P.

AU - Bond, I. A.

AU - Bramich, D. M.

AU - Calchi Novati, S.

AU - Cassan, A.

AU - Coutures, C.

AU - Dieters, S.

AU - Dominik, M.

AU - Prester, D. Dominis

AU - Greenhill, J.

AU - Horne, K.

AU - Jorgensen, U. G.

AU - Kozlowski, S.

AU - Kubas, D.

AU - Lee, C. -H.

AU - Marquette, J. -B.

AU - Mathiasen, M.

AU - Menzies, J.

AU - Monard, L. A. G.

AU - Nishiyama, S.

AU - Papadakis, I.

AU - Street, R.

AU - Sumi, T.

AU - Williams, A.

AU - Yee, J. C.

AU - Brillant, S.

AU - Caldwell, J. A. R.

AU - Cole, A.

AU - Cook, K. H.

AU - Donatowicz, J.

AU - Kains, N.

AU - Kane, S. R.

AU - Martin, R.

AU - Pollard, K. R.

AU - Sahu, K. C.

AU - Tsapras, Y.

AU - Wambsganss, J.

AU - Zub, M.

AU - DePoy, D. L.

AU - Gaudi, B. S.

AU - Han, C.

AU - Lee, C. -U.

AU - Park, B. -G.

AU - Pogge, R. W.

AU - Kubiak, M.

AU - Szymanski, M. K.

AU - Pietrzynski, G.

AU - Soszynski, I.

AU - Szewczyk, O.

AU - Ulaczyk, K.

AU - Wyrzykowski, L.

AU - Abe, F.

AU - Fukui, A.

AU - Furusawa, K.

AU - Gilmore, A. C.

AU - Hearnshaw, J. B.

AU - Itow, Y.

AU - Kamiya, K.

AU - Kilmartin, P. M.

AU - Korpela, A. V.

AU - Lin, W.

AU - Ling, C. H.

AU - Masuda, K.

AU - Matsubara, Y.

AU - Miyake, N.

AU - Muraki, Y.

AU - Nagaya, M.

AU - Ohnishi, K.

AU - Okumura, T.

AU - Perrott, Y.

AU - Rattenbury, N. J.

AU - Saito, To

AU - Sako, T.

AU - Sato, S.

AU - Skuljan, L.

AU - Sullivan, D.

AU - Sweatman, W.

AU - Tristram, P. J.

AU - Yock, P. C. M.

AU - Allan, A.

AU - Bode, M. F.

AU - Burgdorf, M. J.

AU - Clay, N.

AU - Fraser, S. N.

AU - Hawkins, E.

AU - Kerins, E.

AU - Lister, T. A.

AU - Mottram, C. J.

AU - Saunders, E. S.

AU - Snodgrass, C.

AU - Steele, I. A.

AU - Wheatley, P. J.

AU - Anguita, T.

AU - Bozza, V.

AU - Harpsoe, K.

AU - Hinse, T. C.

AU - Hundertmark, M.

AU - Kjaergaard, P.

AU - Liebig, C.

AU - Mancini, L.

AU - Masi, G.

AU - Rahvar, S.

AU - Ricci, D.

AU - Scarpetta, G.

AU - Southworth, J.

AU - Surdej, J.

AU - Thone, C. C.

AU - Riffeser, A.

AU - Seitz, S.

AU - Bender, R.

PY - 2010/7

Y1 - 2010/7

N2 - Context. Not only is gravitational microlensing a successful tool for discovering distant exoplanets, but it also enables characterization of the lens and source stars involved in the lensing event. Aims. In high-magnification events, the lens caustic may cross over the source disk, which allows determination of the angular size of the source and measurement of its limb darkening.Methods. When such extended-source effects appear close to maximum magnification, the resulting light curve differs from the characteristic Paczy ' nski point-source curve. The exact shape of the light curve close to the peak depends on the limb darkening of the source. Dense photometric coverage permits measurement of the respective limb-darkening coefficients.Results. In the case of the microlensing event OGLE 2008-BLG-290, the K giant source star reached a peak magnification at about 100. Thirteen different telescopes have covered this event in eight different photometric bands. Subsequent light-curve analysis yielded measurements of linear limb-darkening coefficients of the source in six photometric bands. The best-measured coefficients lead to an estimate of the source effective temperature of about 4700(-200)(+100) K. However, the photometric estimate from colour-magnitude diagrams favours a cooler temperature of 4200 +/- 100 K.Conclusions. Because the limb-darkening measurements, at least in the CTIO/SMARTS2 V-s- and I-s-bands, are among the most accurate obtained, the above disagreement needs to be understood. A solution is proposed, which may apply to previous events where such a discrepancy also appeared.

AB - Context. Not only is gravitational microlensing a successful tool for discovering distant exoplanets, but it also enables characterization of the lens and source stars involved in the lensing event. Aims. In high-magnification events, the lens caustic may cross over the source disk, which allows determination of the angular size of the source and measurement of its limb darkening.Methods. When such extended-source effects appear close to maximum magnification, the resulting light curve differs from the characteristic Paczy ' nski point-source curve. The exact shape of the light curve close to the peak depends on the limb darkening of the source. Dense photometric coverage permits measurement of the respective limb-darkening coefficients.Results. In the case of the microlensing event OGLE 2008-BLG-290, the K giant source star reached a peak magnification at about 100. Thirteen different telescopes have covered this event in eight different photometric bands. Subsequent light-curve analysis yielded measurements of linear limb-darkening coefficients of the source in six photometric bands. The best-measured coefficients lead to an estimate of the source effective temperature of about 4700(-200)(+100) K. However, the photometric estimate from colour-magnitude diagrams favours a cooler temperature of 4200 +/- 100 K.Conclusions. Because the limb-darkening measurements, at least in the CTIO/SMARTS2 V-s- and I-s-bands, are among the most accurate obtained, the above disagreement needs to be understood. A solution is proposed, which may apply to previous events where such a discrepancy also appeared.

KW - gravitational lensing: micro

KW - techniques: high angular resolution

KW - stars: atmospheres

KW - stars: individual: OGLE 2008-BLG-290

KW - DETACHED ECLIPSING BINARIES

KW - INTERSTELLAR EXTINCTION LAW

KW - STELLAR ATMOSPHERE MODELS

KW - DIFFERENCE IMAGE-ANALYSIS

KW - JOVIAN-MASS PLANET

KW - RED CLUMP STARS

KW - EVENT MOA-2007-BLG-192

KW - HIGH-MAGNIFICATION

KW - PHOTOMETRY

KW - LENS

U2 - 10.1051/0004-6361/201014053

DO - 10.1051/0004-6361/201014053

M3 - Article

SN - 0004-6361

VL - 518

JO - Astronomy & Astrophysics

JF - Astronomy & Astrophysics

M1 - A51

ER -

OGLE 2008-BLG-290: an accurate measurement of the limb darkening of a galactic bulge K Giant spatially resolved by microlensing

Abstract

Keywords

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

Cite this