Naslov
MOA-2010-BLG-311 : A Planetary Candidate below the Threshold of Reliable Detection

Autori
Yee, J.C. ; ... ; Dominis Prester, Dijana ; ... ; Wambsgans, J.

Izvornik
The Astrophysical journal (0004-637X) 769 (2013), 1; 77-1

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Galaxy: bulge; gravitational lensing: micro; planets and satellites: detection

Sažetak
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 Δχ2 ~ 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.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

POVEZANOST RADA