MOA-2010-BLG-523: "failed planet" = RS CVn STAR

The Galactic bulge source MOA-2010-BLG-523S exhibited short-term deviations from a standard microlensing light curve near the peak of anAmax ~ 265 high-magnificationmicrolensing event. The deviations originally seemed consistent with expectations for a planetary companion to the principal lens. We c...

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Bibliographic Details
Main Authors: Gould, A., Yee, J., Bond, I., Udalski, A., Han, C., Jorgensen, U., Greenhill, J., Tsapras, Y., Pinsonneault, M., Bensby, T., Allen, W., Almeida, L., Bos, M., Christie, G., DePoy, D., Dong, S., Gaudi, B., Hung, L., Jablonski, F., Lee, C., McCormick, J., Moorhouse, D., Munoz, J., Natusch, T., Nola, M., Pogge, R., Skowron, J., Thornley, G., Abe, F., Bennett, D., Botzler, C., Chote, P., Freeman, M., Fukui, A., Furusawa, K., Harris, P., Itow, Y., Ling, C., Masuda, K., Matsubara, Y., Miyake, N., Ohnishi, K., Rattenbury, N., Saito, T., Sullivan, D., Sumi, T., Suzuki, D., Sweatman, W., Tristram, P., Wada, K., Yock, P., Szymanski, M., Soszynski, I., Kubiak, M., Poleski, R., Ulaczyk, K., Pietrzynski, G., Wyrzykowski, L., Alsubai, K., Bozza, V., Browne, P., Burgdorf, M., Calchi Novati, S., Dodds, P., Dominik, M., Finet, F., Gerner, T., Hardis, S., Harpsoe, K., Hessman, F., Hinse, T., Hundertmark, M., Kains, N., Kerins, E., Liebig, C., Mancini, L., Mathiasen, M., Penny, M., Proft, S., Rahvar, S., Ricci, D., Sahu, K., Scarpetta, G., Schafer, S., Schonebeck, F., Snodgrass, C., Southworth, J., Surdej, J., Wambsganss, J., Street, R., Horne, K., Bramich, D., Steele, I., Albrow, M., Bachelet, E., Batista, V., Beatty, T., Beaulieu, J., Bennett, C., Bowens-Rubin, R., Brillant, S., Caldwell, J., Cassan, A., Cole, A., Corrales, E., Coutures, C., Dieters, S., Dominis Prester, D., Donatowicz, J., Fouque, P., Henderson, C., Kubas, D., Marquette, J., Martin, R., Menzies, J., Shappee, B., Williams, Andrew, van Saders, J., Zub, M.
Format: Journal Article
Published: Institute of Physics Publishing 2013
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Online Access:http://hdl.handle.net/20.500.11937/31896
Description
Summary:The Galactic bulge source MOA-2010-BLG-523S exhibited short-term deviations from a standard microlensing light curve near the peak of anAmax ~ 265 high-magnificationmicrolensing 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 firstspectroscopically confirmed RS CVn star discovered in the Galactic bulge.