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

Bachelet, E and Bramich, DM and Han, C and Greenhill, J and Street, RA and Gould, A and D'Ago, G and AlSubai, K and Dominik, M and Jaimes, RF and Horne, K and Hundertmark, M and Kains, N and Snodgrass, C and Steele, IA and Tsapras, Y and Albrow, MD and Batista, V and Beaulieu, J-P and Bennett, DP and Brillant, S and Caldwell, JAR and Cassan, A and Cole, A and Coutures, C and Dieters, S and Prester, DD and Donatowicz, J and Fouque, P and Hill, K and Marquette, J-B and Menzies, J and Pere, C and Ranc, C and Wambsganss, J and Warren, D and De Almeida, LA and Choi, J-Y and DePoy, DL and Dong, S and Hung, L-W and Hwang, K-H and Jablonski, F and Jung, YK and Kaspi, S and Klein, N and Lee, C-U and Maoz, D and Munoz, JA and Nataf, D and Park, H and Pogge, RW and Polishook, D and Shin, I-G and Shporer, A and Yee, JC and Abe, F and Bhattacharya, A and Bond, IA and Botzler, CS and Freeman, M and Fukui, A and Itow, Y and Koshimoto, N and Ling, CH and Masuda, K and Matsubara, Y and Muraki, Y and Ohnishi, K and Philpott, LC and Rattenbury, N and Saito, T and Sullivan, DJ and Sumi, T and Suzuki, D and Tristram, PJ and Yonehara, A and Bozza, V and Novati, SC and Ciceri, S and Galianni, P and Gu, S-H and Harpsoe, K and Hinse, TC and Jorgensen, UG and Juncher, D and Korhonen, H and Mancini, L and Melchiorre, C and Popovas, A and Postiglione, A and Rabus, M and Rahvar, S and Schmidt, RW and Scarpetta, G and Skottfelt, J and Southworth, J and Stabile, A and Surdej, J and Wang, X-B and Wertz, O (2015) Red Noise Versus Planetary Interpretations in the Microlensing Event OGLE-2013-BLG-446. Astrophysical Journal, 812 (2). ISSN 0004-637X

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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 (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.

Item Type: Article
Uncontrolled Keywords: 0201 Astronomical And Space Sciences, 0305 Organic Chemistry, 0306 Physical Chemistry (Incl. Structural)
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: American Astronomical Society; IOP Publishing
Related URLs:
Date Deposited: 09 May 2017 08:43
Last Modified: 09 May 2017 08:43
DOI or Identification number: 10.1088/0004-637X/812/2/136
URI: http://researchonline.ljmu.ac.uk/id/eprint/6382

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