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

Yee, J. C.; Hung, L. W.; Bond, I. A.; Allen, W.; Monard, L. A. G.; Albrow, M. D.; Fouqué, P.; Dominik, M.; Tsapras, Y.; Udalski, A.; Gould, A.; Zellem, R.; Bos, M.; Christie, G. W.; DePoy, D. L.; Dong, Subo; Drummond, J.; Gaudi, B. S.; Gorbikov, E.; Han, C.; Kaspi, S.; Klein, N.; Lee, C. U.; Maoz, D.; McCormick, J.; Moorhouse, D.; Natusch, T.; Nola, M.; Park, B. G.; Pogge, R. W.; Polishook, D.; Shporer, A.; Shvartzvald, Y.; Skowron, J.; Thornley, G.; Abe, F.; Bennett, D. P.; Botzler, C. S.; Chote, P.; Freeman, M.; Fukui, A.; Furusawa, K.; Harris, P.; Itow, Y.; Ling, C. H.; Masuda, K.; Matsubara, Y.; Miyake, N.; Ohnishi, K.; Rattenbury, N. J.; Saito, T. o.; Sullivan, D. J.; Sumi, T.; Suzuki, D.; Sweatman, W. L.; Tristram, P. J.; Wada, K.; Yock, P. C. M.; Szymański, M. K.; Soszyński, I.; Kubiak, M.; Poleski, R.; Ulaczyk, K.; Pietrzyński, G.; Wyrzykowski, Ł.; Bachelet, E.; Batista, V.; Beatty, T. G.; Beaulieu, J. P.; Bennett, C. S.; Bowens Rubin, R.; Brillant, S.; Caldwell, J. A. R.; Cassan, A.; Cole, A. A.; Corrales, E.; Coutures, C.; Dieters, S.; Dominis Prester, D.; Donatowicz, J.; Greenhill, J.; Henderson, C. B.; Kubas, D.; Marquette, J. B.; Martin, R.; Menzies, J. W.; Shappee, B.; Williams, A.; Wouters, D.; van Saders, J.; Zub, M.; Street, R. A.; Horne, K.; Bramich, D. M.; Steele, I. A.; Alsubai, K. A.; Bozza, Valerio; Browne, P.; Burgdorf, M. J.; Calchi Novati, Sebastiano; Dodds, P.; Finet, F.; Gerner, T.; Hardis, S.; Harpsøe, K.; Hessman, F. V.; Hinse, T. C.; Hundertmark, M.; Jørgensen, U. G.; Kains, N.; Kerins, E.; Liebig, C.; Mancini, Luigi; Mathiasen, M.; Penny, M. T.; Proft, S.; Rahvar, S.; Ricci, D.; Sahu, K. C.; Scarpetta, Gaetano; Schäfer, S.; Schönebeck, F.; Snodgrass, C.; Southworth, J.; Surdej, J.; Wambsganss, J.

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

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.

Titolo:	MOA-2010-BLG-311: A Planetary Candidate below the Threshold of Reliable Detection
Autori:	Yee, J. C. Hung, L. W. Bond, I. A. Allen, W. Monard, L. A. G. Albrow, M. D. Fouqué, P. Dominik, M. Tsapras, Y. Udalski, A. Gould, A. Zellem, R. Bos, M. Christie, G. W. DePoy, D. L. Dong, Subo Drummond, J. Gaudi, B. S. Gorbikov, E. Han, C. Kaspi, S. Klein, N. Lee, C. U. Maoz, D. McCormick, J. Moorhouse, D. Natusch, T. Nola, M. Park, B. G. Pogge, R. W. Polishook, D. Shporer, A. Shvartzvald, Y. Skowron, J. Thornley, G. Abe, F. Bennett, D. P. Botzler, C. S. Chote, P. Freeman, M. Fukui, A. Furusawa, K. Harris, P. Itow, Y. Ling, C. H. Masuda, K. Matsubara, Y. Miyake, N. Ohnishi, K. Rattenbury, N. J. Saito, T.o. Sullivan, D. J. Sumi, T. Suzuki, D. Sweatman, W. L. Tristram, P. J. Wada, K. Yock, P. C. M. Szymański, M. K. Soszyński, I. Kubiak, M. Poleski, R. Ulaczyk, K. Pietrzyński, G. Wyrzykowski, Ł. Bachelet, E. Batista, V. Beatty, T. G. Beaulieu, J. P. Bennett, C. S. Bowens Rubin, R. Brillant, S. Caldwell, J. A. R. Cassan, A. Cole, A. A. Corrales, E. Coutures, C. Dieters, S. Dominis Prester, D. Donatowicz, J. Greenhill, J. Henderson, C. B. Kubas, D. Marquette, J. B. Martin, R. Menzies, J. W. Shappee, B. Williams, A. Wouters, D. van Saders, J. Zub, M. Street, R. A. Horne, K. Bramich, D. M. Steele, I. A. Alsubai, K. A. BOZZA, Valerio Browne, P. Burgdorf, M. J. CALCHI NOVATI, Sebastiano Dodds, P. Finet, F. Gerner, T. Hardis, S. Harpsøe, K. Hessman, F. V. Hinse, T. C. Hundertmark, M. Jørgensen, U. G. Kains, N. Kerins, E. Liebig, C. MANCINI, Luigi Mathiasen, M. Penny, M. T. Proft, S. Rahvar, S. Ricci, D. Sahu, K. C. SCARPETTA, Gaetano Schäfer, S. Schönebeck, F. Snodgrass, C. Southworth, J. Surdej, J. Wambsganss, J. mostra contributor esterni nascondi contributor esterni
Data di pubblicazione:	2013
Rivista:	THE ASTROPHYSICAL JOURNAL
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 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.
Handle:	http://hdl.handle.net/11386/3984252
Appare nelle tipologie:	1.1.2 Articolo su rivista con ISSN

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