We analyze MOA-2010-BLG-311, a high magnification (A <SUB>max</SUB> > 600) microlensing event with complete data coverage over the peak, making it very sensitive to planetary signals. We fit this event with both a point lens and a two-body lens model and find that the two-body lens model is a better fit but with only ∆χ<SUP>2</SUP> ~ 80. The preferred mass ratio between the lens star and its companion is q = 10<SUP>-3.7 ± 0.1</SUP>, placing the candidate companion in the planetary regime. Despite the formal significance of the planet, we show that because of systematics in the data the evidence for a planetary companion to the lens is too tenuous to claim a secure detection. When combined with analyses of other high-magnification events, this event helps empirically define the threshold for reliable planet detection in high-magnification events, which remains an open question.

Yee, J.c., Hung, L.-., Bond, I.a., Allen, W., Monard, L., Albrow, M.d., et al. (2013). MOA-2010-BLG-311: A planetary candidate below the threshold of reliable detection. THE ASTROPHYSICAL JOURNAL, 769(1), 77 [10.1088/0004-637X/769/1/77].

MOA-2010-BLG-311: A planetary candidate below the threshold of reliable detection

Mancini L.;Ricci D.;
2013-01-01

Abstract

We analyze MOA-2010-BLG-311, a high magnification (A max > 600) microlensing event with complete data coverage over the peak, making it very sensitive to planetary signals. We fit this event with both a point lens and a two-body lens model and find that the two-body lens model is a better fit but with only ∆χ2 ~ 80. The preferred mass ratio between the lens star and its companion is q = 10-3.7 ± 0.1, placing the candidate companion in the planetary regime. Despite the formal significance of the planet, we show that because of systematics in the data the evidence for a planetary companion to the lens is too tenuous to claim a secure detection. When combined with analyses of other high-magnification events, this event helps empirically define the threshold for reliable planet detection in high-magnification events, which remains an open question.
2013
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore FIS/05 - ASTRONOMIA E ASTROFISICA
English
Yee, J.c., Hung, L.-., Bond, I.a., Allen, W., Monard, L., Albrow, M.d., et al. (2013). MOA-2010-BLG-311: A planetary candidate below the threshold of reliable detection. THE ASTROPHYSICAL JOURNAL, 769(1), 77 [10.1088/0004-637X/769/1/77].
Yee, Jc; Hung, L-; Bond, Ia; Allen, W; Monard, Lag; Albrow, Md; Fouque, P; Dominik, M; Tsapras, Y; Udalski, A; Gould, A; Zellem, R; Bos, M; Christie, ...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/204791
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