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

Citation

Bozza, V and Dominik, M and Rattenbury, NJ and Jorgensen, UG and Tsapras, Y and Bramich, DM and Udalski, A and Bond, IA and Liebig, C and Cassan, A and Fouque, P and Fukui, A and Hundertmark, M and Shin, I-G and Lee, SH and Choi, J-Y and Park, S-Y and Gould, A and Allan, A and Mao, S and Wyrzykowski, A and Street, RA and Buckley, D and Nagayama, T and Mathiasen, M and Hinse, TC and Novati, SC and Harpsoe, K and Mancini, L and Scarpetta, G and Anguita, T and Burgdorf, MJ and Horne, K and Hornstrup, A and Kains, N and Kerins, E and Kjaergaard, P and Masi, G and Rahvar, S and Ricci, D and Snodgrass, C and Southworth, J and Steele, IA and Surdej, J and Thone, CC and Wambsganss, J and Zub, M and Albrow, MD and Batista, V and Beaulieu, J-P and Bennett, DP and Caldwell, JAR and Cole, AA and Cook, KH and Coutures, C and Dieters, S and Prester, DD and Donatowicz, J and Greenhill, J and Kane, SR and Kubas, D and Marquette, J-B and Martin, R and Menzies, J and Pollard, KR and Sahu, KC and Williams, A and Szymanski, MK and Kubiak, M and Pietrzynski, G and Soszynski, I and Poleski, R and Ulaczyk, K and Depoy, DL and Dong, S and Han, C and Janczak, J and Lee, C-U and Pogge, RW and Abe, F and Furusawa, K and Hearnshaw, JB and Itow, Y and Kilmartin, PM and Korpela, AV and Lin, W and Ling, CH and Masuda, K and Matsubara, Y and Miyake, N and Muraki, Y and Ohnishi, K and Perrott, YC and Saito, T and Skuljan, L and Sullivan, DJ and Sumi, T and Suzuki, D and Sweatman, WL and Tristram, PJ and Wada, K and Yock, PCM and Gulbis, A and Hashimoto, Y and Kniazev, A and Vaisanen, P, 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. ISSN 0035-8711 (2012) [Refereed Article]

Copyright Statement

Copyright 2012 The Authors Monthly Notices of the Royal Astronomical Society Copyright 2012 RAS

DOI: doi:10.1111/j.1365-2966.2012.21233.x

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 Details

Item Type:Refereed Article
Keywords:gravitational lensing, micro-planetary systems
Research Division:Physical Sciences
Research Group:Astronomical and Space Sciences
Research Field:Stellar Astronomy and Planetary Systems
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Physical Sciences
Author:Cole, AA (Associate Professor Andrew Cole)
Author:Dieters, S (Dr Stefan Dieters)
Author:Greenhill, J (Dr John Greenhill)
ID Code:82640
Year Published:2012
Web of Science® Times Cited:11
Deposited By:Mathematics and Physics
Deposited On:2013-02-08
Last Modified:2017-11-06
Downloads:0

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