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Published October 20, 2015 | Submitted + Published
Journal Article Open

Red Noise Versus Planetary Interpretations in the Microlensing Event Ogle-2013-BLG-446

Abstract

For all exoplanet candidates, the reliability of a claimed detection needs to be assessed through a careful study of systematic errors in the data to minimize the false positives rate. We present a method to investigate such systematics in microlensing data sets using the microlensing event OGLE-2013-BLG-0446 as a case study. The event was observed from multiple sites around the world and its high magnification (A_(max) ~ 3000) allowed us to investigate the effects of terrestrial and annual parallax. Real-time modeling of the event while it was still ongoing suggested the presence of an extremely low-mass companion (~3M_⊕) to the lensing star, leading to substantial follow-up coverage of the light curve. We test and compare different models for the light curve and conclude that the data do not favor the planetary interpretation when systematic errors are taken into account.

Additional Information

© 2015 American Astronomical Society. Received 2015 April 15; accepted 2015 August 31; published 2015 October 16. The authors would like to thank the anonymous referee for the usefull comments. This publication was made possible by the NPRP grant # X-019-1-006 from the Qatar National Research Fund (a member of Qatar Foundation). The statements made herein are solely the responsibility of the authors. The authors thank the OGLE collaboration for the access of the optimized photometry. This work makes use of observations from the LCOGT network. This research has made use of the LCOGT Archive, which is operated by the California Institute of Technology, under contract with the Las Cumbres Observatory. This research has made much use of NASA's Astrophysics Data System. This research made use of the SIMBAD database, the VizieR catalog access tool, and the cross-match service provide d by CDS, Strasbourg, France. T.S. acknowledges the financial support from the JSPS, JSPS23103002,JSPS24253004 and JSPS26247023. The M.O.A. project is supported by the grant JSPS25103508 and 23340064. D.P.B. acknowledges support from NSF grants AST-1009621 and AST-1211875, as well as NASA grants NNX12AF54G and NNX13AF64G. Work by I.A.B. and P.Y. was supported by the Marsden Fund of the Royal Society of New Zealand, contract no. MAU1104. The operation of the Danish 1.54 m telescope is financed by a grant to UGJ from the Danish Natural Science Research Council. We also acknowledge support from the Center of Excellence Centre for Star and Planet Formation (StarPlan) funded by The Danish National Research Foundation. The MiNDSTEp monitoring campaign is powered by ARTEMiS (Automated Terrestrial Exoplanet Microlensing Search; Dominik et al. 2008, AN 329, 248). K.A.A., M.D., K.H., M.H., C.S., R.A.S., and Y.T. are thankful to Qatar National Research Fund (QNRF), member of Qatar Foundation, for support by grant NPRP 09-476-1-078. C.S. has received funding from the European Union Seventh Framework Programme (FP7/2007–2013) under grant agreement No. 268421. Work by C.H. was supported by the Creative Research Initiative Program (2009-0081561) of National Research Foundation of Korea. S.H.G. and X.B.W. would like to thank the financial support from National Natural Science Foundation of China through grants Nos. 10873031 and 11473066. T.C.H. acknowledges support from the Korea Research Council of Fundamental Science & Technology (KRCF) via the KRCF Young Scientist Research Fellowship Programme and for financial support from KASI travel grant number 2013-9-400-00. H.K. acknowledges the support from the European Commission under the Marie Curie IEF Programme in FP7. M.R. acknowledges support from FONDECYT postdoctoral fellowship No. 3120097. O.W. (FNRS research fellow) and J. Surdej acknowledge support from the Communauté française de Belgique—Actions de recherche concertées—Académie Wallonie-Europe. The HPC (and/or scientific visualization) resources and services used in this work were provided by the IT Research Computing group in Texas A&M University at Qatar. IT Research Computing is funded by the Qatar Foundation for Education, Science and Community Development (http://www.qf.org.qa).

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Published - Bachelet_2015.pdf

Submitted - 1510.02724v2.pdf

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August 22, 2023
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