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

February 2013 • 2013ApJ...763..141G

Authors • Gould, A. • Yee, J. C. • Bond, I. A. • Udalski, A. • Han, C. • Jørgensen, U. G. • Greenhill, J. • Tsapras, Y. • Pinsonneault, M. H. • Bensby, T. • Allen, W. • Almeida, L. A. • Bos, M. • Christie, G. W. • DePoy, D. L. • Dong, Subo • Gaudi, B. S. • Hung, L. -W. • Jablonski, F. • Lee, C. -U. • McCormick, J. • Moorhouse, D. • Muñoz, J. A. • Natusch, T. • Nola, M. • Pogge, R. W. • Skowron, J. • Thornley, G. • μFUN Collaboration • Abe, F. • Bennett, D. P. • Botzler, C. S. • Chote, P. • Freeman, M. • Fukui, A. • Furusawa, K. • Harris, P. • Itow, Y. • Ling, C. H. • Masuda, K. • Matsubara, Y. • Miyake, N. • Ohnishi, K. • Rattenbury, N. J. • Saito, To. • Sullivan, D. J. • Sumi, T. • Suzuki, D. • Sweatman, W. L. • Tristram, P. J. • Wada, K. • Yock, P. C. M. • MOA Collaboration • Szymański, M. K. • Soszyński, I. • Kubiak, M. • Poleski, R. • Ulaczyk, K. • Pietrzyński, G. • Wyrzykowski, Ł. • OGLE Collaboration • Alsubai, K. A. • Bozza, V. • Browne, P. • Burgdorf, M. J. • Calchi Novati, S. • Dodds, P. • Dominik, M. • Finet, F. • Gerner, T. • Hardis, S. • Harpsøe, K. • Hessman, F. V. • Hinse, T. C. • Hundertmark, M. • Kains, N. • Kerins, E. • Liebig, C. • Mancini, L. • Mathiasen, M. • Penny, M. T. • Proft, S. • Rahvar, S. • Ricci, D. • Sahu, K. C. • Scarpetta, G. • Schäfer, S. • Schönebeck, F. • Snodgrass, C. • Southworth, J. • Surdej, J. • Wambsganss, J. • MiNDSTEp Consortium, The • Street, R. A. • Horne, K. • Bramich, D. M. • Steele, I. A. • RoboNet Collaboration • Albrow, M. D. • Bachelet, E. • Batista, V. • Beatty, T. G. • Beaulieu, J. -P. • Bennett, C. S. • Bowens-Rubin, R. • Brillant, S. • Caldwell, J. A. R. • Cassan, A. • Cole, A. A. • Corrales, E. • Coutures, C. • Dieters, S. • Dominis Prester, D. • Donatowicz, J. • Fouqué, P. • Henderson, C. B. • Kubas, D. • Marquette, J. -B. • Martin, R. • Menzies, J. W. • Shappee, B. • Williams, A. • van Saders, J. • Zub, M. • PLANET Collaboration

Abstract • The Galactic bulge source MOA-2010-BLG-523S exhibited short-term deviations from a standard microlensing light curve near the peak of an A _max ~ 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 light-curve deviations. This is the first spectroscopically confirmed RS CVn star discovered in the Galactic bulge.

Based on observations made with the European Southern Observatory telescopes, Program ID 85.B-0399(I).

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Sebastiano Calchi Novati

Associate Scientist