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...

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Veröffentlicht in:	The Astrophysical journal 2015-10, Vol.812 (2), p.136
Hauptverfasser:	Bachelet, E., Bramich, D. M., Han, C., Greenhill, J., Street, R. A., Gould, A., D'Ago, G., AlSubai, K., Dominik, M., Jaimes, R. Figuera, Horne, K., Hundertmark, M., Kains, N., Snodgrass, C., Steele, I. A., 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., Prester, D. Dominis, Donatowicz, J., Fouqué, P., Hill, K., Marquette, J.-B., Menzies, J., Pere, C., Ranc, C., Wambsganss, J., Warren, D., Almeida, L. Andrade de, 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, To, Sullivan, D. J., Sumi, T., Suzuki, D., Tristram, P. J., Yonehara, A., Bozza, V., Calchi Novati, S., Ciceri, S., Galianni, 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, John, Stabile, An, Surdej, J., Wang, X.-B., Wertz, O.
Format:	Artikel
Sprache:	eng
Schlagworte:	ASTROPHYSICS, COSMOLOGY AND ASTRONOMY Aérospatiale, astronomie & astrophysique COMPARATIVE EVALUATIONS DETECTION DIAGRAMS EARTH PLANET ERRORS Extrasolar planets GLOBAL ASPECTS GRAVITATIONAL LENSES gravitational lensing: micro Light curve MASS NOISE Parallax Physical, chemical, mathematical & earth Sciences Physique, chimie, mathématiques & sciences de la terre planetary systems Real time RELIABILITY Sciences of the Universe Space science, astronomy & astrophysics STARS Systematic errors techniques: photometric VISIBLE RADIATION
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Zusammenfassung:	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.
ISSN:	0004-637X 1538-4357 1538-4357
DOI:	10.1088/0004-637X/812/2/136