Article (Scientific journals)
OGLE 2008-BLG-290: an accurate measurement of the limb darkening of a galactic bulge K Giant spatially resolved by microlensing
Fouqué, P.; Heyrovský, D.; Dong, S. et al.
2010In Astronomy and Astrophysics, 518, p. 51.1-A51.12
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Keywords :
gravitational lensing: micro; techniques: high angular; resolution; stars: atmospheres; stars: individual:; OGLE 2008-BLG-290
Abstract :
[en] 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. <BR /> 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. <BR /> Methods: When such extended-source effects appear close to maximum magnification, the resulting light curve differs from the characteristic Paczyński 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. <BR /> 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[SUP]+100[/SUP][SUB]-200[/SUB] K. However, the photometric estimate from colour-magnitude diagrams favours a cooler temperature of 4200 ± 100 K. <BR /> 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.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Fouqué, P.;  Probing Lensing Anomalies Network, ; LATT, Université de Toulouse, CNRS, 14 avenue Edouard Belin, 31400 Toulouse, France
Heyrovský, D.;  Institute of Theoretical Physics, Charles University, V Holešovičkách 2, 18000 Prague, Czech Republic
Dong, S.;  Microlensing Follow Up Network, ; Department of Astronomy, Ohio State University, 140 West 18th Avenue, Columbus, OH 43210, USA
Gould, A.;  Microlensing Follow Up Network, ; Department of Astronomy, Ohio State University, 140 West 18th Avenue, Columbus, OH 43210, USA
Udalski, A.;  The Optical Gravitational Lensing Experiment, ; Warsaw University Observatory. Al. Ujazdowskie 4, 00-478 Warszawa, Poland
Albrow, M. D.;  Probing Lensing Anomalies Network, ; University of Canterbury, Department of Physics & Astronomy, Private Bag 4800, Christchurch 8020, New Zealand
Batista, V.;  Probing Lensing Anomalies Network, ; Institut d'Astrophysique de Paris, CNRS, Université Pierre & Marie Curie, 98bis Bd Arago, 75014 Paris, France
Beaulieu, J*-P;  Probing Lensing Anomalies Network, ; Institut d'Astrophysique de Paris, CNRS, Université Pierre & Marie Curie, 98bis Bd Arago, 75014 Paris, France
Bennett, D. P.;  Probing Lensing Anomalies Network, ; Microlensing Observations in Astrophysics, ; University of Texas, McDonald Observatory, 16120 St Hwy Spur 78, Fort Davis TX 79734, USA
Bond, I. A.;  Microlensing Observations in Astrophysics, ; Institute of Information and Mathematical Sciences, Massey University, Private Bag 102-904, North Shore Mail Centre, Auckland, New Zealand
Bramich, D. M.;  Probing Lensing Anomalies Network, ; Robotic Telescope Network, ; European Southern Observatory (ESO), Karl-Schwarzschild-Straße 2, 85748 Garching bei München, Germany
Calchi Novati, S.;  Dipartimento di Fisica, Universita' di Salerno and INFN, sez. di Napoli, Italy
Cassan, A.;  Probing Lensing Anomalies Network, ; Astronomisches Rechen-Institut (ARI), Zentrum für Astronomie der Universität Heidelberg (ZAH), Mönchhofstrasse 12-14, 69120 Heidelberg, Germany
Coutures, C.;  Probing Lensing Anomalies Network, ; Institut d'Astrophysique de Paris, CNRS, Université Pierre & Marie Curie, 98bis Bd Arago, 75014 Paris, France
Dieters, S.;  Probing Lensing Anomalies Network, ; Institut d'Astrophysique de Paris, CNRS, Université Pierre & Marie Curie, 98bis Bd Arago, 75014 Paris, France
Dominik, M.;  Probing Lensing Anomalies Network, ; Robotic Telescope Network, ; Microlensing Network for the Detection of Small Terrestrial Exoplanets, ; Scottish Universities Physics Alliance, School of Physics & Astronomy, University of St Andrews, North Haugh, St Andrews, KY16 9SS, UK
Dominis Prester, D.;  Probing Lensing Anomalies Network, ; Physics Department, Faculty of Arts and Sciences, University of Rijeka, Omladinska 14, 51000 Rijeka, Croatia
Greenhill, J.;  Probing Lensing Anomalies Network, ; School of Mathematics and Physics, University of Tasmania, Private Bag 37, Hobart, Tasmania 7001, Australia
Horne, K.;  Probing Lensing Anomalies Network, ; Robotic Telescope Network, ; Scottish Universities Physics Alliance, School of Physics & Astronomy, University of St Andrews, North Haugh, St Andrews, KY16 9SS, UK
Jørgensen, U. G.;  Microlensing Network for the Detection of Small Terrestrial Exoplanets, ; Dark Cosmology Centre, Københavns Universitet, Juliane Maries Vej 30, 2100 København, Denmark
Kozłowski, S.;  Microlensing Follow Up Network, ; Department of Astronomy, Ohio State University, 140 West 18th Avenue, Columbus, OH 43210, USA
Kubas, D.;  Probing Lensing Anomalies Network, ; European Southern Observatory (ESO), Casilla 19001, Vitacura 19, Santiago, Chile
Lee, C*-H;  University Observatory Munich, Scheinerstrasse 1, 81679 München, Germany ; The Wendelstein Calar Alto Pixellensing Project,
Marquette, J*-B;  Probing Lensing Anomalies Network, ; Institut d'Astrophysique de Paris, CNRS, Université Pierre & Marie Curie, 98bis Bd Arago, 75014 Paris, France
Mathiasen, M.;  Microlensing Network for the Detection of Small Terrestrial Exoplanets, ; Dark Cosmology Centre, Københavns Universitet, Juliane Maries Vej 30, 2100 København, Denmark
Menzies, J.;  Probing Lensing Anomalies Network, ; South African Astronomical Observatory, PO Box 9 Observatory 7925, South Africa
Monard, L. A. G.;  Microlensing Follow Up Network, ; Bronberg Observatory, Pretoria, South Africa
Nishiyama, S.;  Department of Astronomy, Kyoto University, Kyoto 606-8502, Japan
Papadakis, I.;  Microlensing Follow Up Network, ; Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya, 464-8601, Japan
Street, R.;  Probing Lensing Anomalies Network, ; Robotic Telescope Network, ; Las Cumbres Observatory, 6740B Cortona Dr, suite 102, Goleta, CA 93117, USA ; Department of Physics, Broida Hall, University of California, Santa Barbara CA 93106-9530, USA
Sumi, T.;  Microlensing Observations in Astrophysics, ; Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya, 464-8601, Japan
Williams, A.;  Probing Lensing Anomalies Network, ; Perth Observatory, Walnut Road, Bickley, Perth 6076, Australia
Yee, J. C.;  Microlensing Follow Up Network, ; Department of Astronomy, Ohio State University, 140 West 18th Avenue, Columbus, OH 43210, USA
Brillant, S.;  European Southern Observatory (ESO), Casilla 19001, Vitacura 19, Santiago, Chile
Caldwell, J. A. R.;  University of Texas, McDonald Observatory, 16120 St Hwy Spur 78, Fort Davis TX 79734, USA
Cole, A.;  School of Mathematics and Physics, University of Tasmania, Private Bag 37, Hobart, Tasmania 7001, Australia
Cook, K. H.;  Institute of Geophysics and Planetary Physics (IGPP), L-413, Lawrence Livermore National Laboratory, PO Box 808, Livermore, CA 94551, USA
Donatowicz, J.;  Technical University of Vienna, Dept. of Computing, Wiedner Hauptstrasse 10, Vienna, Austria
Kains, N.;  Robotic Telescope Network, ; Scottish Universities Physics Alliance, School of Physics & Astronomy, University of St Andrews, North Haugh, St Andrews, KY16 9SS, UK
Kane, S. R.;  NASA Exoplanet Science Institute, Caltech, MS 100-22, 770 South Wilson Avenue, Pasadena, CA 91125, USA
Martin, Rosa ;  Centre Hospitalier Universitaire de Liège - CHU > Service d'Informations médico économiques (SIME) - Service facturation
Pollard, K. R.;  University of Canterbury, Department of Physics & Astronomy, Private Bag 4800, Christchurch 8020, New Zealand
Sahu, K. C.;  Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA
Tsapras, Y.;  Robotic Telescope Network, ; Las Cumbres Observatory, 6740B Cortona Dr, suite 102, Goleta, CA 93117, USA ; School of Mathematical Sciences, Queen Mary University of London, Mile End Road, London E1 4NS, UK
Wambsganss, J.;  Microlensing Network for the Detection of Small Terrestrial Exoplanets, ; Astronomisches Rechen-Institut (ARI), Zentrum für Astronomie der Universität Heidelberg (ZAH), Mönchhofstrasse 12-14, 69120 Heidelberg, Germany
Depoy, D. L.;  Department of Astronomy, Ohio State University, 140 West 18th Avenue, Columbus, OH 43210, USA
Gaudi, B. S.;  Department of Astronomy, Ohio State University, 140 West 18th Avenue, Columbus, OH 43210, USA
Han, C.;  Department of Physics, Institute for Basic Science Research, Chungbuk National University, Chongju 361-763, Korea
Lee, C*-U;  Korea Astronomy and Space Science Institute, 61-1, Whaam-Dong, Youseong-Gu, Daejeon 305-348, Korea
Park, B*-G;  Korea Astronomy and Space Science Institute, 61-1, Whaam-Dong, Youseong-Gu, Daejeon 305-348, Korea
Kubiak, M.;  Warsaw University Observatory. Al. Ujazdowskie 4, 00-478 Warszawa, Poland
Szymański, M. K.;  Warsaw University Observatory. Al. Ujazdowskie 4, 00-478 Warszawa, Poland
Pietrzyński, G.;  Warsaw University Observatory. Al. Ujazdowskie 4, 00-478 Warszawa, Poland ; Universidad de Concepción, Departamento de Física, Astronomy Group, Casilla 160-C, Concepción, Chile
Soszyński, I.;  Warsaw University Observatory. Al. Ujazdowskie 4, 00-478 Warszawa, Poland
Szewczyk, O.;  Warsaw University Observatory. Al. Ujazdowskie 4, 00-478 Warszawa, Poland ; Universidad de Concepción, Departamento de Física, Astronomy Group, Casilla 160-C, Concepción, Chile
Ulaczyk, K.;  Warsaw University Observatory. Al. Ujazdowskie 4, 00-478 Warszawa, Poland
Abe, F.;  Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya, 464-8601, Japan
Fukui, A.;  Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya, 464-8601, Japan
Furusawa, K.;  Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya, 464-8601, Japan
Gilmore, A. C.;  University of Canterbury, Department of Physics & Astronomy, Private Bag 4800, Christchurch 8020, New Zealand
Hearnshaw, J. B.;  University of Canterbury, Department of Physics & Astronomy, Private Bag 4800, Christchurch 8020, New Zealand
Itow, Y.;  Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya, 464-8601, Japan
Kamiya, K.;  Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya, 464-8601, Japan
Kilmartin, P. M.;  Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA, UK
Korpela, A. V.;  Mount John Observatory, PO Box 56, Lake Tekapo 8770, New Zealand
Lin, W.;  University of Canterbury, Department of Physics & Astronomy, Private Bag 4800, Christchurch 8020, New Zealand
Ling, C. H.;  Technical University of Vienna, Dept. of Computing, Wiedner Hauptstrasse 10, Vienna, Austria
Masuda, K.;  Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya, 464-8601, Japan
Matsubara, Y.;  Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya, 464-8601, Japan
Miyake, N.;  Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya, 464-8601, Japan
Muraki, Y.;  Department of Physics, Konan University, Nishiokamoto 8-9-1, Kobe 658-8501, Japan
Nagaya, M.;  Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya, 464-8601, Japan
Ohnishi, K.;  Nagano National College of Technology, Nagano 381-8550, Japan
Okumura, T.;  Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya, 464-8601, Japan
Perrott, Y.;  Department of Physics, University of Auckland, Private Bag 92019, Auckland 1142, New Zealand
Rattenbury, N. J.;  Robotic Telescope Network, ; Department of Physics, University of Auckland, Private Bag 92019, Auckland 1142, New Zealand
Saito, To;  Tokyo Metropolitan College of Industrial Technology, Tokyo 116-0003, Japan
Sako, T.;  Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya, 464-8601, Japan
Sato, S.;  Department of Physics and Astrophysics, Faculty of Science, Nagoya University, Nagoya 464-8602, Japan
Skuljan, L.;  University of Canterbury, Department of Physics & Astronomy, Private Bag 4800, Christchurch 8020, New Zealand
Sullivan, D.;  Mount John Observatory, PO Box 56, Lake Tekapo 8770, New Zealand
Sweatman, W.;  University of Canterbury, Department of Physics & Astronomy, Private Bag 4800, Christchurch 8020, New Zealand
Tristram, P. J.;  Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA, UK
Allan, A.;  School of Physics, University of Exeter, Stocker Road, Exeter EX4 4QL, UK
Bode, M. F.;  Astrophysics Research Institute, Liverpool John Moores University, Twelve Quays House, Egerton Wharf, Birkenhead CH41 1LD, UK
Burgdorf, M. J.;  Microlensing Network for the Detection of Small Terrestrial Exoplanets, ; Deutsches SOFIA Institut, Universität Stuttgart, Pfaffenwaldring 31, 70569 Stuttgart, Germany ; SOFIA Science Center, NASA Ames Research Center, Mail Stop N211-3, Moffett Field CA 94035, USA
Clay, N.;  Astrophysics Research Institute, Liverpool John Moores University, Twelve Quays House, Egerton Wharf, Birkenhead CH41 1LD, UK
Fraser, S. N.;  Astrophysics Research Institute, Liverpool John Moores University, Twelve Quays House, Egerton Wharf, Birkenhead CH41 1LD, UK
Hawkins, E.;  Las Cumbres Observatory, 6740B Cortona Dr, suite 102, Goleta, CA 93117, USA
Kerins, E.;  Jodrell Bank Centre for Astrophysics, University of Manchester, Manchester M13 9PL, UK
Lister, T. A.;  Las Cumbres Observatory, 6740B Cortona Dr, suite 102, Goleta, CA 93117, USA
Mottram, C. J.;  Astrophysics Research Institute, Liverpool John Moores University, Twelve Quays House, Egerton Wharf, Birkenhead CH41 1LD, UK
Saunders, E. S.;  Las Cumbres Observatory, 6740B Cortona Dr, suite 102, Goleta, CA 93117, USA ; School of Physics, University of Exeter, Stocker Road, Exeter EX4 4QL, UK
Snodgrass, C.;  Microlensing Network for the Detection of Small Terrestrial Exoplanets, ; European Southern Observatory (ESO), Casilla 19001, Vitacura 19, Santiago, Chile
Steele, I. A.;  Astrophysics Research Institute, Liverpool John Moores University, Twelve Quays House, Egerton Wharf, Birkenhead CH41 1LD, UK
Anguita, T.;  Astronomisches Rechen-Institut (ARI), Zentrum für Astronomie der Universität Heidelberg (ZAH), Mönchhofstrasse 12-14, 69120 Heidelberg, Germany
Bozza, V.;  Dipartimento di Fisica, Universita' di Salerno and INFN, sez. di Napoli, Italy
Harpsøe, K.;  Dark Cosmology Centre, Københavns Universitet, Juliane Maries Vej 30, 2100 København, Denmark
Hinse, T. C.;  Dark Cosmology Centre, Københavns Universitet, Juliane Maries Vej 30, 2100 København, Denmark ; Armagh Observatory, College Hill, Armagh, BT61 9DG, Ireland
Hundertmark, M.;  Institut für Astrophysik, Georg-August Universität, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany
Kjærgaard, P.;  Dark Cosmology Centre, Københavns Universitet, Juliane Maries Vej 30, 2100 København, Denmark
Liebig, C.;  Astronomisches Rechen-Institut (ARI), Zentrum für Astronomie der Universität Heidelberg (ZAH), Mönchhofstrasse 12-14, 69120 Heidelberg, Germany
Mancini, L.;  Dipartimento di Fisica, Universita' di Salerno and INFN, sez. di Napoli, Italy
Masi, G.;  Bellatrix Observatory, via Madonna de Loco 47, 03023 Ceccano, Italy
Rahvar, S.;  Department of Physics, Sharif University of Technology, PO Box 11155-9161, Tehran, Iran
Ricci, Davide ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
Scarpetta, G.;  Dipartimento di Fisica, Universita' di Salerno and INFN, sez. di Napoli, Italy
Southworth, J.;  Astrophysics Group, Keele University, Newcastle-under-Lyme, ST5 5BG, UK
Surdej, Jean  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
Thöne, C. C.;  Dark Cosmology Centre, Københavns Universitet, Juliane Maries Vej 30, 2100 København, Denmark ; INAF, Osservatorio Astronomico di Brera, via E. Bianchi 46, 23807 Merate (LC), Italy ; Microlensing Network for the Detection of Small Terrestrial Exoplanets,
Riffeser, A.;  University Observatory Munich, Scheinerstrasse 1, 81679 München, Germany
Seitz, S.;  University Observatory Munich, Scheinerstrasse 1, 81679 München, Germany ; Max Planck Institute for Extraterrestrial Physics, Giessenbachstrasse, 85748 Garching, Germany
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Language :
English
Title :
OGLE 2008-BLG-290: an accurate measurement of the limb darkening of a galactic bulge K Giant spatially resolved by microlensing
Publication date :
01 July 2010
Journal title :
Astronomy and Astrophysics
ISSN :
0004-6361
eISSN :
1432-0746
Publisher :
EDP Sciences, Les Ulis, France
Volume :
518
Pages :
A51.1-A51.12
Peer reviewed :
Peer Reviewed verified by ORBi
Commentary :
http://de.arxiv.org/abs/1005.0966
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