We present a strong case for a transiting hot Jupiter planet identified during a single-field transit survey toward the Lupus Galactic plane. The object, Lupus-TR-3b, transits a V = 17.4 K1 V host star every 3.91405 days. Spectroscopy and stellar colors indicate a host star with effective temperature 5000 ± 150 K, with a stellar mass and radius of 0.87 ± 0.04 solar mass and 0.82 ± 0.05 solar radius, respectively. Limb-darkened transit fitting yields a companion radius of 0.89 ± 0.07 R_J and an orbital inclination of 88.3_(-0.8)~(+1.3) deg. Magellan 6.5 m MIKE radial velocity measurements reveal a 2.4 σ K = 114 ± 25 m s~(-1) sinusoidal variation in phase with the transit ephemeris. The resulting mass is 0.81 ± 0.18 M_J and density 1.4 ± 0.4 g cm~(-3). Y-band PANIC image deconvolution reveals a V ＞ 21 red neighbor 0.4" away which, although highly unlikely, we cannot conclusively rule out as a blended binary with current data. However, blend simulations show that only the most unusual binary system can reproduce our observations. This object is very likely a planet, detected from a highly efficient observational strategy. Lupus-TR-3b constitutes the faintest ground-based detection to date, and one of the lowest mass hot Jupiters known.
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机译：对于单向飞过狼疮银河系飞机的一次野外调查，我们提出了一个强热木星行星的强力案例。 Lupus-TR-3b天体每3.91405天转换一次V = 17.4 K1 V宿主恒星。光谱和恒星颜色表示有效温度为5000±150 K的主星，恒星质量和半径分别为0.87±0.04太阳质量和0.82±0.05太阳半径。四肢变暗的过渡拟合产生0.89±0.07 R_J的伴随半径和88.3 _（-0.8）〜（+1.3）度的轨道倾角。麦哲伦6.5 m MIKE径向速度测量结果显示，与过渡星历的相位呈2.4σK = 114±25 m s〜（-1）正弦变化。所得质量为0.81±0.18M_J，密度为1.4±0.4g cm·（-3）。 Y波段PANIC图像反卷积揭示了V＞ 21的红色邻居0.4“距离，尽管极不可能，但我们不能最终排除与当前数据混合的二进制。但是，混合仿真表明，只有最不寻常的二进制系统才能重现我们的数据。观测：这个物体很可能是通过高效的观测策略探测到的行星，Lupus-TR-3b构成了迄今为止最微弱的地面探测，也是已知质量最低的热木星之一。
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