MOA-2010-BLG-523: "Failed Planet" = RS CVn Star
Creators: name: Gould, A.
name: Yee, J. C.
name: Bond, I. A.
name: Udalski, A.
name: Han, C.
name: Jorgensen, U. G.
name: Greenhill, J.
name: Tsapras, Y.
name: Pinsonneault, M. H.
name: Bensby, T.
name: Allen, W.
name: Almeida, L. A.
name: Bos, M.
name: Christie, G. W.
name: DePoy, D. L.
name: Dong, Subo
name: Gaudi, B. S.
name: Hung, L. -W.
name: Jablonski, F.
name: Lee, C. -U.
name: McCormick, J.
name: Moorhouse, D.
name: Munoz, J. A.
name: Natusch, T.
name: Nola, M.
name: Pogge, R. W.
name: Skowron, J.
name: Thornley, G.
name: Abe, F.
name: Bennett, D. P.
name: Botzler, C. S.
name: Chote, P.
name: Freeman, M.
name: Fukui, A.
name: Furusawa, K.
name: Harris, P.
name: Itow, Y.
name: Ling, C. H.
name: Masuda, K.
name: Matsubara, Y.
name: Miyake, N.
name: Ohnishi, K.
name: Rattenbury, N. J.
name: Saito, To.
name: Sullivan, D. J.
name: Sumi, T.
name: Suzuki, D.
name: Sweatman, W. L.
name: Tristram, P. J.
name: Wada, K.
name: Yock, P. C. M.
name: Szymanski, M. K.
name: Soszynski, I.
name: Kubiak, M.
name: Poleski, R.
name: Ulaczyk, K.
name: Pietrzynski, G.
name: Wyrzykowski, L.
name: Alsubai, K. A.
name: Bozza, V.
name: Browne, P.
name: Burgdorf, M. J.
name: Novati, S. Calchi
name: Dodds, P.
name: Dominik, M.
name: Finet, F.
name: Gerner, T.
name: Hardis, S.
name: Harpsoe, K.
name: Hessman, F. V.
name: Hinse, T. C.
name: Hundertmark, M.
name: Kains, N.
name: Kerins, E.
name: Liebig, C.
name: Mancini, L.
name: Mathiasen, M.
name: Penny, M. T.
name: Proft, S.
name: Rahvar, S.
name: Ricci, D.
name: Sahu, K. C.
name: Scarpetta, G.
name: Schafer, S.
name: Schonebeck, F.
name: Snodgrass, C.
name: Southworth, J.
name: Surdej, J.
name: Wambsganss, J.
name: Street, R. A.
name: Horne, K.
name: Bramich, D. M.
name: Steele, I. A.
name: Albrow, M. D.
name: Bachelet, E.
name: Batista, V.
name: Beatty, T. G.
name: Beaulieu, J. -P.
name: Bennett, C. S.
name: Bowens-Rubin, R.
name: Brillant, S.
name: Caldwell, J. A. R.
name: Cassan, A.
name: Cole, A. A.
name: Corrales, E.
name: Coutures, C.
name: Dieters, S.
name: Prester, D. Dominis
name: Donatowicz, J.
name: Fouque, P.
name: Henderson, C. B.
name: Kubas, D.
name: Marquette, J. -B
name: Martin, R.
name: Menzies, J. W.
name: Shappee, B.
name: Williams, A.
name: van Saders, J.
name: Zub, M.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: 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.
description: 29 pp, 6 figs, submitted to ApJ