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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents



ID: 661056.0, MPI für Astronomie / Publikationen_mpia
OGLE-2008-BLG-510: first automated real-time detection of a weak microlensing anomaly - brown dwarf or stellar binary?
Authors:Bozza, V.; Dominik, M.; Rattenbury, N. J.; Jørgensen, U. G.; Tsapras, Y.; Bramich, D. M.; Udalski, A.; Bond, I. A.; Liebig, C.; Cassan, A.; Fouqué, P.; Fukui, A.; Hundertmark, M.; Shin, I. -. G.; Lee, S. H.; Choi, J. -. Y.; Park, S. -. Y.; Gould, A.; Allan, A.; Mao, S.; Wyrzykowski, Å. .; Street, R. A.; Buckley, D.; Nagayama, T.; Mathiasen, M.; Hinse, T. C.; Novati, S. C.; Harpsøe, K.; Mancini, L.; Scarpetta, G.; Anguita, T.; Burgdorf, M. J.; Horne, K.; Hornstrup, A.; Kains, N.; Kerins, E.; Kjærgaard, P.; Masi, G.; Rahvar, S.; Ricci, D.; Snodgrass, C.; Southworth, J.; Steele, I. A.; Surdej, J.; Thöne, C. C.; Wambsganss, J.; Zub, M.; Albrow, M. D.; Batista, V.; Beaulieu, J. -. P.; Bennett, D. P.; Caldwell, J. A. R.; Cole, A. A.; Cook, K. H.; Coutures, C.; Dieters, S.; Prester, D. D.; Donatowicz, J.; Greenhill, J.; Kane, S. R.; Kubas, D.; Marquette, J. -. B.; Martin, R.; Menzies, J.; Pollard, K. R.; Sahu, K. C.; Williams, A.; Szymański, M. K.; Kubiak, M.; Pietrzyński, G.; Soszyński, I.; Poleski, R.; Ulaczyk, K.; DePoy, D. L.; Dong, S.; Han, C.; Janczak, J.; Lee, C. -. U.; Pogge, R. W.; Abe, F.; Furusawa, K.; Hearnshaw, J. B.; Itow, Y.; Kilmartin, P. M.; Korpela, A. V.; Lin, W.; Ling, C. H.; Masuda, K.; Matsubara, Y.; Miyake, N.; Muraki, Y.; Ohnishi, K.; Perrott, Y. C.; Saito, T.; Skuljan, L.; Sullivan, D. J.; Sumi, T.; Suzuki, D.; Sweatman, W. L.; Tristram, P. J.
Date of Publication (YYYY-MM-DD):2012
Journal Abbrev.:Monthly Notices of the Royal Astronomical Society
Volume:424
Issue / Number:2
Start Page:902
End Page:918
Audience:Not Specified
Abstract / Description:The microlensing event OGLE-2008-BLG-510 is characterized by an evident asymmetric shape of the peak, promptly detected by the Automated Robotic Terrestrial Exoplanet Microlensing Search (ARTEMiS) system in real time. The skewness of the light curve appears to be compatible both with binary-lens and binary-source models, including the possibility that the lens system consists of an M dwarf orbited by a brown dwarf. The detection of this microlensing anomaly and our analysis demonstrate that: (1) automated real-time detection of weak microlensing anomalies with immediate feedback is feasible, efficient and sensitive, (2) rather common weak features intrinsically come with ambiguities that are not easily resolved from photometric light curves, (3) a modelling approach that finds all features of parameter space rather than just the 'favourite model' is required and (4) the data quality is most crucial, where systematics can be confused with real features, in particular small higher order effects such as orbital motion signatures. It moreover becomes apparent that events with weak signatures are a silver mine for statistical studies, although not easy to exploit. Clues about the apparent paucity of both brown-dwarf companions and binary-source microlensing events might hide here. Based in part on data collected by MiNDSTEp with the Danish 1.54m telescope at the ESO La Silla Observatory.
Free Keywords:gravitational lensing: micro; planetary systems
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:URL:http://cdsads.u-strasbg.fr/abs/2012MNRAS.424..902B
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