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

Bachelet, E. and Calchi Novati, S. (2015) Red Noise Versus Planetary Interpretations in the Microlensing Event Ogle-2013-BLG-446. Astrophysical Journal, 812 (2). Art. No. 136. ISSN 0004-637X. https://resolver.caltech.edu/CaltechAUTHORS:20151221-082946180

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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.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1088/0004-637X/812/2/136DOIArticle
http://iopscience.iop.org/article/10.1088/0004-637X/812/2/136PublisherArticle
http://arxiv.org/abs/1510.02724arXivDiscussion Paper
ORCID:
AuthorORCID
Bachelet, E.0000-0002-6578-5078
Calchi Novati, S.0000-0002-7669-1069
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).
Group:Infrared Processing and Analysis Center (IPAC)
Funders:
Funding AgencyGrant Number
Qatar National Research FundX-019-1-006
Las Cumbres ObservatoryUNSPECIFIED
Japan Society for the Promotion of Science (JSPS)JSPS23103002
Japan Society for the Promotion of Science (JSPS)JSPS24253004
Japan Society for the Promotion of Science (JSPS)JSPS26247023
Japan Society for the Promotion of Science (JSPS)JSPS25103508
Japan Society for the Promotion of Science (JSPS)23340064
NSFAST-1009621
NSFAST-1211875
NASANNX12AF54G
NASANNX13AF64G
Marsden Fund of the Royal Society of New ZealandMAU1104
Danish Natural Science Research CouncilUNSPECIFIED
Center of Excellence Centre for Star and Planet Formation (StarPlan)UNSPECIFIED
Danish National Research FoundationUNSPECIFIED
Qatar National Research Fund (QNRF)NPRP 09-476-1-078
European Union Seventh Framework Programme (FP7/2007-2013)268421
National Research Foundation of Korea Creative Research Initiative Program2009-0081561
National Natural Science Foundation of China10873031
National Natural Science Foundation of China11473066
Korea Research Council of Fundamental Science & Technology (KRCF) KRCF Young Scientist Research Fellowship ProgrammeUNSPECIFIED
KASI travel grant2013-9-400-00
European Commission under the Marie Curie IEF Programme in FP7UNSPECIFIED
Fondo Nacional de Desarrollo Científico y Tecnológico (FONDECYT)3120097
Actions de recherche concertées (Communauté française de Belgique)UNSPECIFIED
Qatar Foundation for Education, Science and Community DevelopmentUNSPECIFIED
Subject Keywords:gravitational lensing: micro; planetary systems; techniques: photometric
Issue or Number:2
Record Number:CaltechAUTHORS:20151221-082946180
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20151221-082946180
Official Citation:E. Bachelet et al 2015 ApJ 812 136
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:63089
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:22 Dec 2015 20:11
Last Modified:09 Mar 2020 13:18

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