Table 1
Summary of previous photometric surveys in the Praesepe around the hydrogen-burning limit.
| Authors | Telescope/instrument | Area | BD | Completeness limits |
| (deg2) | candidates | (mag) | ||
|
|
||||
| Hambly et al. (1995) | COSMOS/POS & UKSTU | 19 | 0 | RF ~ 20, IN ~ 19 |
| Pinfield et al. (1997) | INT/WFC | 1.0 | ~10a | R = 21.5, I = 20.0, Z = 21.5 |
| Magazzù et al. (1998) | INT/WFC | 0.22 | 1 | R = 22.2, I = 21.2 |
| Chappelle et al. (2005) | INT/WFC | 2.6 | 4 | Ic = 21., Z = 20.5 |
| González-García et al. (2006) | 3.5 m CAHA / LAICA & 5 m Hale / LFI | 0.33 | 1 | i′ = 23.8, z′ = 23.3 |
| Boudreault et al. (2010) | 3.5 m CAHA / Ω2k & 2.2 m La Silla/WFI | 3.1 | 6 | Ic = 23.2, J = 19.9, Ks = 18.6 |
| This workb | LBT/LBC | 0.59 | 37 | r = 24.1, i = 25.6, z = 24.7, Y = 20.3 |
Notes. The completeness limits correspond to a 10σ detection, while those of the present work and Boudreault et al. (2010) correspond to 5σ detections.
From Fig. 3 in Pinfield et al. (1997), about 10 of their 26 Praesepe member candidates have masses below 72 MJup.
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