OGLE 2008--BLG--290: An accurate measurement of the limb darkening of a Galactic Bulge K Giant spatially resolved by microlensing
| Autor: | S. Dieters, R. Bender, M. Hundertmark, C. Liebig, E. S. Saunders, N. Kains, Takashi Sako, Teppei Okumura, Kailash C. Sahu, Arnaud Cassan, Timo Anguita, M. F. Bode, V. Batista, J. B. Marquette, John B. Hearnshaw, L. Skuljan, Ian A. Bond, Andrew A. Cole, P. M. Kilmartin, C.-U. Lee, D. Dominis Prester, Andrew Gould, Darren L. DePoy, Winston L. Sweatman, Igor Soszyński, S. Kozlowski, J. Donatowicz, D. J. Sullivan, Jennifer C. Yee, J. G. Greenhill, R. Street, P. C. M. Yock, Kimiaki Masuda, A. C. Gilmore, Sohrab Rahvar, P. J. Tristram, Yutaka Matsubara, Tobias C. Hinse, K. H. Cook, O. Szewczyk, Davide Ricci, Yasushi Muraki, Keith Horne, J. W. Menzies, B. S. Gaudi, M. Mathiasen, T. A. Lister, Colin Snodgrass, Yoshitaka Itow, A. Riffeser, P. J. Wheatley, Chien-Hsiu Lee, M. Zub, Kouji Ohnishi, N. Miyake, D. P. Bennett, Susumu Sato, Stella Seitz, C. J. Mottram, Iain A. Steele, R. M. Martin, P. Fouque, N. R. Clay, C. H. Ling, K. R. Pollard, Joachim Wambsganss, S. R. Kane, E. Hawkins, Byeong-Gon Park, R. W. Pogge, Martin Burgdorf, J. P. Beaulieu, Jean Surdej, K. Ulaczyk, U. G. Jørgensen, Yiannis Tsapras, M. Kubiak, Michael D. Albrow, Andrew Williams, S. Calchi Novati, L. A. G. Monard, M. Nagaya, D. Kubas, D. Heyrovsky, Grzegorz Pietrzyński, Takahiro Sumi, Eamonn Kerins, Y. C. Perrott, To. Saito, L. Wyrzykowski, Christina C. Thöne, Shogo Nishiyama, Valerio Bozza, A. V. Korpela, Martin Dominik, Akihiko Fukui, Fumio Abe, C. Han, I. E. Papadakis, D. M. Bramich, Kisaku Kamiya, Andrzej Udalski, Michał K. Szymański, G. Masi, Luigi Mancini, Gaetano Scarpetta, N. J. Rattenbury, Kasper Harpsøe, Per Kjaergaard, Alasdair Allan, John Southworth, J. A. R. Caldwell, W. Lin, S. Dong, K. Furusawa, C. Coutures, Stephane Brillant, S. N. Fraser |
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| Přispěvatelé: | Laboratoire Astrophysique de Toulouse-Tarbes (LATT), Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS), Institut d'Astrophysique de Paris (IAP), Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2010 |
| Předmět: |
FOS: Physical sciences
Astrophysics gravitational lensing: micro Astrophysics::Cosmology and Extragalactic Astrophysics Gravitational microlensing 01 natural sciences stars: individual Settore FIS/05 - Astronomia e Astrofisica Angular diameter Bulge techniques: high angular 0103 physical sciences stars: atmospheres Astrophysics::Solar and Stellar Astrophysics 010303 astronomy & astrophysics Solar and Stellar Astrophysics (astro-ph.SR) Astrophysics::Galaxy Astrophysics QB gravitational lensing high angular resolution atmospheres OGLE 2008–BLG–290 Physics [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph] 010308 nuclear & particles physics Astrophysics::Instrumentation and Methods for Astrophysics resolution Astronomy and Astrophysics Effective temperature Light curve Exoplanet Stars OGLE 2008-BLG-290 Astrophysics - Solar and Stellar Astrophysics Space and Planetary Science Limb darkening [SDU]Sciences of the Universe [physics] Astrophysics::Earth and Planetary Astrophysics |
| Zdroj: | Astronomy & Astrophysics Artículos CONICYT CONICYT Chile instacron:CONICYT Astronomy and Astrophysics-A&A Astronomy and Astrophysics-A&A, 2010, 518, ⟨10.1051/0004-6361/201014053⟩ |
| ISSN: | 0004-6361 |
| DOI: | 10.1051/0004-6361/201014053⟩ |
| Popis: | Gravitational microlensing is not only a successful tool for discovering distant exoplanets, but it also enables characterization of the lens and source stars involved in the lensing event. In high magnification events, the lens caustic may cross over the source disk, which allows a determination of the angular size of the source and additionally a measurement of its limb darkening. When such extended-source effects appear close to maximum magnification, the resulting light curve differs from the characteristic Paczynski 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. In the case of microlensing event OGLE 2008-BLG-290, the K giant source star reached a peak magnification of 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. As the limb-darkening measurements, at least in the CTIO/SMARTS2 V and I 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. Astronomy & Astrophysics in press |
| Databáze: | OpenAIRE |
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