标题： 从CoRoT空间任务中发现的凌日系外行星XXVIII. CoRoT-33b，一个位于棕矮星荒漠中的天体，与它的主恒星具有2:3的共轨关系 显示英文标题

标题： Transiting exoplanets from the CoRoT space mission XXVIII. CoRoT-33b, an object in the brown dwarf desert with 2:3 commensurability with its host star

摘要： 我们报告发现了一颗罕见的凌日棕矮星，其质量为59 M_Jup，半径为1.1 R_Jup，围绕金属丰富、[Fe/H] = +0.44、G9V型恒星CoRoT-33运行。轨道偏心率（e = 0.07），周期为5.82天。因此，伴星CoRoT-33b是所谓的棕矮星沙漠中的新成员。轨道周期与恒星自转周期处于3:2共振的3%以内。CoRoT-33b可能是一个重要的潮汐演化研究案例。棕矮星接近其主星（P < 10 d）的真实频率估计约为0.2%，这比同一周期范围内的热木星频率低约六倍。我们怀疑棕矮星的频率随着周期减小而下降得比巨行星更快。 显示英文摘要

摘要： We report the detection of a rare transiting brown dwarf with a mass of 59 M_Jup and radius of 1.1 R_Jup around the metal-rich, [Fe/H] = +0.44, G9V star CoRoT-33. The orbit is eccentric (e = 0.07) with a period of 5.82 d. The companion, CoRoT-33b, is thus a new member in the so-called brown dwarf desert. The orbital period is within 3% to a 3:2 resonance with the rotational period of the star. CoRoT-33b may be an important test case for tidal evolution studies. The true frequency of brown dwarfs close to their host stars (P < 10 d) is estimated to be approximately 0.2% which is about six times smaller than the frequency of hot Jupiters in the same period range. We suspect that the frequency of brown dwarfs declines faster with decreasing period than that of giant planets.