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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
OGLE 2008-BLG-290: An accurate measurement of the limb darkening of a galactic bulge K Giant spatially resolved by microlensing
Astronomy and Astrophysics, Volume 518, No. 19, Article A51, Year 2010
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Description
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 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. 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$^{+100}-{-200}$ 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 Vs- and Is-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. © 2010 ESO.
Authors & Co-Authors
Fouqué, Pascal
Australia
Probing Lensing Anomalies Network
France, Toulouse
Université Fédérale Toulouse Midi-pyrénées
Heyrovský, D.
Czech Republic, Prague
Charles University
Dong, Subo
United States
Microlensing Follow up Network
United States, Columbus
The Ohio State University
Gould, Andrew P.
United States
Microlensing Follow up Network
United States, Columbus
The Ohio State University
Udalski, Andrzej
United States
Optical Gravitational Lensing Experiment
Poland, Warsaw
University of Warsaw
Albrow, Michael D.
Australia
Probing Lensing Anomalies Network
New Zealand, Christchurch
University of Canterbury
Batista, Virginie
Australia
Probing Lensing Anomalies Network
France, Paris
Institut D’astrophysique de Paris
Beaulieu, Jean Philippe H.
Australia
Probing Lensing Anomalies Network
France, Paris
Institut D’astrophysique de Paris
Bennett, David P.
Australia
Probing Lensing Anomalies Network
United States
Microlensing Observations in Astrophysics
United States, Austin
University of Texas System
Bond, Ian A.
United States
Microlensing Observations in Astrophysics
New Zealand, Auckland
Massey University Auckland
Bramich, Daniel M.
Australia
Probing Lensing Anomalies Network
United States
Robotic Telescope Network
Germany, Garching Bei Munchen
European Southern Observatory
Calchi-Novati, Sebastiano
Italy, Salerno
Università Degli Studi Di Salerno
Cassan, Arnaud
Australia
Probing Lensing Anomalies Network
Germany, Heidelberg
Astronomisches Rechen-institut
Coutures, Christian
Australia
Probing Lensing Anomalies Network
France, Paris
Institut D’astrophysique de Paris
Dieters, Stefan W.B.
Australia
Probing Lensing Anomalies Network
France, Paris
Institut D’astrophysique de Paris
Dominik, Martin
Australia
Probing Lensing Anomalies Network
United States
Robotic Telescope Network
United States
Microlensing Network for the Detection of Small Terrestrial Exoplanets
United Kingdom, St Andrews
University of st Andrews
Dominis-Prester, Dijana
Australia
Probing Lensing Anomalies Network
Croatia, Rijeka
Faculty of Physics, University of Rijeka
Greenhill, John G.
Australia
Probing Lensing Anomalies Network
Australia, Hobart
University of Tasmania
Hörne, Keith D.
Australia
Probing Lensing Anomalies Network
United States
Robotic Telescope Network
United Kingdom, St Andrews
University of st Andrews
Jörgensen, Uffe Gråe
United States
Microlensing Network for the Detection of Small Terrestrial Exoplanets
Denmark, Copenhagen
Københavns Universitet
Kozłowski, Szymon Z.
United States
Microlensing Follow up Network
United States, Columbus
The Ohio State University
Kubas, Daniel
Australia
Probing Lensing Anomalies Network
Chile, Santiago
European Southern Observatory Santiago
Lee, C. H.
Germany, Munich
Ludwig-maximilians-universität München
United States
Wendelstein Calar Alto Pixellensing Project
Marquette, Jean Baptiste
Australia
Probing Lensing Anomalies Network
France, Paris
Institut D’astrophysique de Paris
Mathiasen, M.
United States
Microlensing Network for the Detection of Small Terrestrial Exoplanets
Denmark, Copenhagen
Københavns Universitet
Menzies, John W.
Australia
Probing Lensing Anomalies Network
South Africa, Cape Town
South African Astronomical Observatory
Monard, Libert A.G.Berto
United States
Microlensing Follow up Network
South Africa, Pretoria
Bronberg Observatory
Nishiyama, Shogo
Japan, Kyoto
Kyoto University
Papadakis, Iossif E.
United States
Microlensing Follow up Network
Japan, Nagoya
Nagoya University
Street, Rachel A.
Australia
Probing Lensing Anomalies Network
United States
Robotic Telescope Network
United States, Santa Barbara
Las Cumbres Observatory Global Telescope Network, Inc
United States, Santa Barbara
University of California, Santa Barbara
Sumi, Takahiro
United States
Microlensing Observations in Astrophysics
Japan, Nagoya
Nagoya University
Williams, Andrew J.
Australia
Probing Lensing Anomalies Network
Australia, Bickley
Perth Observatory
Yee, Jennifer C.
United States
Microlensing Follow up Network
United States, Columbus
The Ohio State University
Brillant, Stéphanie
Chile, Santiago
European Southern Observatory Santiago
Caldwell, John A.R.
United States, Austin
University of Texas System
Cole, Andrew A.
Australia, Hobart
University of Tasmania
Cook, Kem H.
United States, Livermore
Lawrence Livermore National Laboratory
Donatowicz, J.
Austria, Vienna
Technische Universität Wien
Kains, Noé
United States
Robotic Telescope Network
United Kingdom, St Andrews
University of st Andrews
Kane, Stephen R.
United States, Washington, D.c.
National Aeronautics and Space Administration
Martin, Ralph
Australia, Bickley
Perth Observatory
Pollard, Karen R.
New Zealand, Christchurch
University of Canterbury
Sahu, Kailash C.
United States, Baltimore
Space Telescope Science Institute
Tsapras, Yiannis
United States
Robotic Telescope Network
United States, Santa Barbara
Las Cumbres Observatory Global Telescope Network, Inc
United Kingdom, London
Queen Mary University of London
Wambsganss, Joachim
Germany, Heidelberg
Astronomisches Rechen-institut
United States
Microlensing Network for the Detection of Small Terrestrial Exoplanets
DePoy, Darren L.
United States, Columbus
The Ohio State University
Gaudi, B. Scott
United States, Columbus
The Ohio State University
Han, Cheongho
South Korea, Cheongju
Chungbuk National University
Lee, Chung-uk
South Korea, Daejeon
Korea Astronomy and Space Science Institute
Park, Byeong-gon
South Korea, Daejeon
Korea Astronomy and Space Science Institute
Pogge, Richard W.
United States
Microlensing Follow up Network
United States, Columbus
The Ohio State University
Kubiak, Marcin
Poland, Warsaw
University of Warsaw
Szymánski, Michał K.
Poland, Warsaw
University of Warsaw
Pietrzýnski, Grzegorz
Poland, Warsaw
University of Warsaw
Chile, Biobio
Universidad de Concepcion
Soszyński, Igor
Poland, Warsaw
University of Warsaw
Szewczyk, Olaf
Poland, Warsaw
University of Warsaw
Chile, Biobio
Universidad de Concepcion
Ulaczyk, Krzysztof
Poland, Warsaw
University of Warsaw
Wyrzykowski, Łukasz
United States
Optical Gravitational Lensing Experiment
United Kingdom, Cambridge
Institute of Astronomy
Abe, Fumio
Japan, Nagoya
Nagoya University
Fukui, Akihiko
Japan, Nagoya
Nagoya University
Furusawa, Kei
Japan, Nagoya
Nagoya University
Gilmore, Alan C.
New Zealand, Christchurch
University of Canterbury
Hearnshaw, John B.
New Zealand, Christchurch
University of Canterbury
Itow, Yoshitaka
Japan, Nagoya
Nagoya University
Kamiya, Koki
Japan, Nagoya
Nagoya University
Kilmartin, Pamela M.
United Kingdom, Cambridge
Institute of Astronomy
Korpela, Aarno V.
New Zealand, Lake Tekapo
University of Canterbury Mount John Observatory
Lin, Wei
New Zealand, Christchurch
University of Canterbury
Ling, Chohong
Austria, Vienna
Technische Universität Wien
Masuda, Kimiaki
Japan, Nagoya
Nagoya University
Matsubara, Yutaka
Japan, Nagoya
Nagoya University
Miyake, Noriyuki
Japan, Nagoya
Nagoya University
Muraki, Y.
Japan, Kobe
Konan University
Nagaya, Maiko
Japan, Nagoya
Nagoya University
Ohnishi, Kouji
Japan, Nagano
National Institute of Technology, Nagano College
Okumura, T.
Japan, Nagoya
Nagoya University
Perrott, Yvette C.
New Zealand, Auckland
The University of Auckland
Rattenbury, Nicholas James
United States
Robotic Telescope Network
New Zealand, Auckland
The University of Auckland
Saito, To
Japan, Tokyo
Tokyo Metropolitan College of Industrial Technology
Sako, Takashi
Japan, Nagoya
Nagoya University
Sato, Shuji
Japan, Nagoya
Nagoya University
Skuljan, Ljiljana
New Zealand, Christchurch
University of Canterbury
Sullivan, Denis J.
New Zealand, Lake Tekapo
University of Canterbury Mount John Observatory
Sweatman, Winston L.
New Zealand, Christchurch
University of Canterbury
Tristram, Paul J.
United Kingdom, Cambridge
Institute of Astronomy
Yock, C. M.
United States
Microlensing Observations in Astrophysics
New Zealand, Auckland
The University of Auckland
Allan, Alasdair
United Kingdom, Exeter
University of Exeter
Bode, Michael F.
United Kingdom, Liverpool
Liverpool John Moores University
Burgdorf, Martin J.
United States
Microlensing Network for the Detection of Small Terrestrial Exoplanets
Germany, Stuttgart
Universität Stuttgart
United States, Moffett Field
Nasa Ames Research Center
Clay, Neil R.
United Kingdom, Liverpool
Liverpool John Moores University
Fraser, Stephen N.
United Kingdom, Liverpool
Liverpool John Moores University
Hawkins, Eric
United States, Santa Barbara
Las Cumbres Observatory Global Telescope Network, Inc
Kerins, Eamonn J.
United Kingdom, Manchester
The University of Manchester
Lister, Tim A.
United States, Santa Barbara
Las Cumbres Observatory Global Telescope Network, Inc
Mottram, Christopher J.
United Kingdom, Liverpool
Liverpool John Moores University
Saunders, Eric S.
United States, Santa Barbara
Las Cumbres Observatory Global Telescope Network, Inc
United Kingdom, Exeter
University of Exeter
Snodgrass, Colin
United States
Microlensing Network for the Detection of Small Terrestrial Exoplanets
Chile, Santiago
European Southern Observatory Santiago
Steele, Iain A.
United Kingdom, Liverpool
Liverpool John Moores University
Wheatley, Peter J.
United States
Robotic Telescope Network
United Kingdom, Coventry
University of Warwick
Anguita, Timo
Germany, Heidelberg
Astronomisches Rechen-institut
Statistics
Citations: 100
Authors: 100
Affiliations: 51
Identifiers
Doi:
10.1051/0004-6361/201014053
ISSN:
00046361
e-ISSN:
14320746
Research Areas
Health System And Policy