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

A. Gould*, J. C. Yee, I. A. Bond, A. Udalski, C. Han, U. G. Jorgensen, J. Greenhill, Y. Tsapras, M. H. Pinsonneault, T. Bensby, 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 LeeJ. McCormick, D. Moorhouse, J. A. Munoz, T. Natusch, M. Nola, R. W. Pogge, J. Skowron, G. Thornley, 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, M. K. Szymanski, I. Soszynski, M. Kubiak, R. Poleski, K. Ulaczyk, G. Pietrzynski, L. Wyrzykowski, 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. Schaefer, F. Schoenebeck, C. Snodgrass, J. Southworth, J. Surdej, J. Wambsganss, R. A. Street, K. Horne, D. M. Bramich, I. A. Steele, 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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

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) similar to 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.

Original languageEnglish
Article number141
Number of pages11
JournalAstrophysical Journal
Volume763
Issue number2
DOIs
Publication statusPublished - 1 Feb 2013

Keywords

  • Gravitational lensing: micro
  • Planetary systems
  • Starspots
  • Stars: variables: general
  • Gravitational lensing experiment
  • Galactic bulge
  • Microlensing events
  • High-magnification
  • Variable-stars
  • Dwarf stars
  • Systems
  • Photometry
  • Rotation
  • Catalog

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