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


Yee, JC and Hung, L-W and Bond, IA and Allen, W and Monard, LAG and Albrow, MD and Fouque, P and Dominik, M and Tsapras, Y and Udalski, A and Gould, A and Zellem, R and Bos, M and Christie, GW and DePoy, DL and Dong, S and Drummond, J and Gaudi, BS and Gorbikov, E and Han, C and Kaspi, S and Klein, N and Lee, C-U and Maoz, D and McCormick, J and Moorhouse, D and Natusch, T and Nola, M and Park, B-G and Pogge, RW and Polishook, D and Shporer, A and Shvartzvald, Y and Skowron, J and Thornley, G and Abe, F and Bennett, DP and Botzler, CS and Chote, P and Freeman, M and Fukui, A and Furusawa, K and Harris, P and Itow, Y and Ling, CH and Masuda, K and Matsubara, Y and Miyake, N and Ohnishi, K and Rattenbury, NJ and Saito, T and Sullivan, DJ and Sumi, T and Suzuki, D and Sweatman, WL and Tristram, PJ and Wada, K and Yock, PCM and Szymanski, MK and Soszynski, I and Kubiak, M and Poleski, R and Ulaczyk, K and Pietrzynski, G and Wyrzykowski, A and Bachelet, E and Batista, V and Beatty, TG and Beaulieu, J-P and Bennett, CS and Bowens-Rubin, R and Brillant, S and Caldwell, JAR and Cassan, A and Cole, AA and Corrales, E and Coutures, C and Dieters, S and Dominis Prester, D and Donatowicz, J and Greenhill, J and Henderson, CB and Kubas, D and Marquette, J-B and Martin, R and Menzies, JW and Shappee, B and Williams, A and Wouters, D and van Saders, J and Zub, M and Street, RA and Horne, K and Bramich, DM and Steele, IA and Alsubai, KA and Bozza, V and Browne, P and Burgdorf, MJ and Calchi Novati, S and Dodds, P and Finet, F and Gerner, T and Hardis, S and Harpsoe, K and Hessman, FV and Hinse, TC and Hundertmark, M and Jorgensen, UG and Kains, N and Kerins, E and Liebig, C and Mancini, L and Mathiasen, M and Penny, MT and Proft, S and Rahvar, S and Ricci, D and Sahu, KC and Scarpetta, G and Schafer, S and Schonebeck, F and Snodgrass, C and Southworth, J and Surdej, J and Wambsganss, J, MOA-2010-BLG-311: A planetary candidate below the threshold of reliable detection, Astrophysical Journal, 769, (1) Article 77. ISSN 0004-637X (2013) [Refereed Article]

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Copyright 2013 The American Astronomical Society

DOI: doi:10.1088/0004-637X/769/1/77


We analyze MOA-2010-BLG-311, a high magnification (Amax > 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.

Item Details

Item Type:Refereed Article
Keywords:Galaxy: bulge – gravitational lensing: micro – planets and satellites: detection
Research Division:Physical Sciences
Research Group:Astronomical sciences
Research Field:Galactic astronomy
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the physical sciences
UTAS Author:Cole, AA (Professor Andrew Cole)
UTAS Author:Dieters, S (Dr Stefan Dieters)
UTAS Author:Greenhill, J (Dr John Greenhill)
ID Code:90352
Year Published:2013
Web of Science® Times Cited:19
Deposited By:Mathematics and Physics
Deposited On:2014-04-01
Last Modified:2017-11-06

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