Red noise versus planetary interpretations in the microlensing event Ogle-2013-BLG-446
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Date
20/10/2015Author
Funder
Grant ID
UF100010 / UF130581
ST/M001296/1
ST/J001651/1
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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 (Amax ~ 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.
Citation
Bachelet , E , Bramich , D M , Han , C , Greenhill , J , Street , R A , Gould , A , D’Ago , G , AlSubai , K , Dominik , M , Figuera Jaimes , R J , Horne , K D , Hundertmark , M P G , Kains , N , Snodgrass , C , Steele , I A , Tsapras , Y , Albrow , M D , Batista , V , Beaulieu , J-P , Bennett , D P , Brillant , S , Caldwell , J A R , Cassan , A , Cole , A , Coutures , C , Dieters , S , Dominis Prester , D , Donatowicz , J , Fouqué , P , Hill , K , Marquette , J-B , Menzies , J , Pere , C , Ranc , C , Wambsganss , J , Warren , D , de Almeida , L A , Choi , J-Y , DePoy , D L , Dong , S , Hung , L-W , Hwang , K-H , Jablonski , F , Jung , Y K , Kaspi , S , Klein , N , Lee , C-U , Maoz , D , Muñoz , J A , Nataf , D , Park , H , Pogge , R W , Polishook , D , Shin , I-G , Shporer , A , Yee , J C , Abe , F , Bhattacharya , A , Bond , I A , Botzler , C S , Freeman , M , Fukui , A , Itow , Y , Koshimoto , N , Ling , C H , Masuda , K , Matsubara , Y , Muraki , Y , Ohnishi , K , Philpott , L C , Rattenbury , N , Saito , T , Sullivan , D J , Sumi , T , Suzuki , D , Tristram , P J , Yonehara , A , Bozza , V , Calchi Novati , S , Ciceri , S , Grant , P , Gu , S-H , Harpsøe , K , Hinse , T C , Jørgensen , U G , Juncher , D , Korhonen , H , Mancini , L , Melchiorre , C , Popovas , A , Postiglione , A , Rabus , M , Rahvar , S , Schmidt , R W , Scarpetta , G , Skottfelt , J , Southworth , J , Stabile , A , Surdej , J , Wang , X-B & Wertz , O 2015 , ' Red noise versus planetary interpretations in the microlensing event Ogle-2013-BLG-446 ' , Astrophysical Journal , vol. 812 , no. 2 . https://doi.org/10.1088/0004-637X/812/2/136
Publication
Astrophysical Journal
Status
Peer reviewed
ISSN
0004-637XType
Journal article
Rights
© 2015. The American Astronomical Society. All rights reserved. This work is made available online in accordance with the publisher’s policies. This is the final published version of the work, which was originally published at: https://dx.doi.org/10.1088/0004-637X/812/2/136
Description
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.Collections
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