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OGLE-2008-BLG-510: first automated real-time detection of a weak microlensing anomaly - brown dwarf or stellar binary?

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, Ł.; Street, R. A.; Buckley, D.; Nagayama, T.; Mathiasen, M.; Hinse, T. C.; Calchi Novati, S.; Harpsøe, K.; Mancini, L.; Scarpetta, G.; Anguita, T.; Burgdorf, M. J.; Horne, K.; Hornstrup, A.; Kains, N.; Kerins, E.; Kjaergaard, 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.; Dominis Prester, 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, Subo; 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, To.; Skuljan, L.; Sullivan, D. J.; Sumi, T.; Suzuki, D.; Sweatman, W. L.; Tristram, P. J.; Wada, K.; Yock, P. C. M.; Gulbis, A.; Hashimoto, Y.; Kniazev, A. and Vaisanen, P. (2012). OGLE-2008-BLG-510: first automated real-time detection of a weak microlensing anomaly - brown dwarf or stellar binary? Monthly Notices of the Royal Astronomical Society, 424(2) pp. 902–918.

DOI (Digital Object Identifier) Link: https://doi.org/10.1111/j.1365-2966.2012.21233.x
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Abstract

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.

Item Type: Journal Item
Copyright Holders: 2012 The Authors
ISSN: 1365-2966
Project Funding Details:
Funded Project NameProject IDFunding Body
Not SetNPRP 09-476-1-078Qatar National Research Fund
Keywords: gravitational lensing; planetary systems
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Research Group: Space
Item ID: 43060
Depositing User: Colin Snodgrass
Date Deposited: 29 May 2015 09:40
Last Modified: 07 Dec 2018 10:31
URI: http://oro.open.ac.uk/id/eprint/43060
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