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MOA-2010-BLG-523: "Failed Planet" = RS CVn Star

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arxiv 1210.6045 v2 pith:GHXEXCED submitted 2012-10-22 astro-ph.SR astro-ph.EP

MOA-2010-BLG-523: "Failed Planet" = RS CVn Star

A. Gould (OSU) , J. C. Yee (OSU) , I. A. Bond (Massey U.) , A. Udalski (Warsaw Obs.) , C. Han (Chungbuk Nat. U.) , U. G. Jorgensen (Niels Bohr Inst.) , J. Greenhill (U. of Tasmania) , Y. Tsapras (LCOGT)
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M. H. Pinsonneault (OSU) T. Bensby (Lund Obs.) W. Allen L. A. Almeida M. Bos G. W. Christie D. L. DePoy Subo Dong B. S. Gaudi L.-W. Hung F. Jablonski C.-U. Lee J. McCormick D. Moorhouse J. A. Munoz T. Natusch M. Nola R. W. Pogge J. Skowron G. Thornley (The uFUN Collaboration) F. Abe D. P. Bennett C. S. Botzler P. Chote M. Freeman A. Fukui K. Furusawa P. Harris Y. Itow C. H. Ling K. Masuda Y. Matsubara N. Miyake K. Ohnishi N. J. Rattenbury To. Saito D. J. Sullivan T. Sumi D. Suzuki W. L. Sweatman P. J. Tristram K. Wada P. C. M. Yock (The MOA Collaboration) M. K. Szymanski I. Soszynski M. Kubiak R. Poleski K. Ulaczyk G. Pietrzynski L. Wyrzykowski (The OGLE Collaboration) K. A. Alsubai V. Bozza P. Browne M. J. Burgdorf S. Calchi Novati P. Dodds M. Dominik F. Finet T. Gerner S. Hardis K. Harpsoe F. V. Hessman T. C. Hinse M. Hundertmark N. Kains E. Kerins C. Liebig L. Mancini M. Mathiasen M. T. Penny S. Proft S. Rahvar D. Ricci K. C. Sahu G. Scarpetta S. Schafer F. Schonebeck C. Snodgrass J. Southworth J. Surdej J. Wambsganss (The MiNDSTEp Consortium) R. A. Street K. Horne D. M. Bramich I. A. Steele (The RoboNet Collaboration) M. D. Albrow E. Bachelet V. Batista T. G. Beatty J.-P. Beaulieu C. S. Bennett R. Bowens-Rubin S. Brillant J. A. R. Caldwell A. Cassan A. A. Cole E. Corrales C. Coutures S. Dieters D. Dominis Prester J. Donatowicz P. Fouque C. B. Henderson D. Kubas J.-B Marquette R. Martin J. W. Menzies B. Shappee A. Williams J. van Saders M. Zub (The PLANET Collaboration)
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classification astro-ph.SR astro-ph.EP
keywords deviationsmicrolensingbulgegalacticlightcurvenearpeakplanetary
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The Galactic bulge source MOA-2010-BLG-523S exhibited short-term deviations from a standard microlensing lightcurve near the peak of an Amax ~ 265 high-magnification microlensing event. The deviations originally seemed consistent with expectations for a planetary companion to the principal lens. We combine long-term photometric monitoring with a previously published high-resolution spectrum taken near peak to demonstrate that this is an RS CVn variable, so that planetary microlensing is not required to explain the lightcurve deviations. This is the first spectroscopically confirmed RS CVn star discovered in the Galactic bulge.

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