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A short-period super-Earth orbiting the M2.5 dwarf GJ 3634. Detection with HARPS velocimetry and transit search with Spitzer photometry

机译:短周期的超地球,绕着M2.5矮人GJ 3634飞行。使用HARPS测速仪进行探测,使用Spitzer测光仪进行过渡搜索

摘要

We report on the detection of GJ 3634b, a super-Earth of mass m sin i = 7.0[SUB]-0.8[SUP]+0.9[/SUP]~M_⊕[/SUB] and period P = 2.64561 ± 0.00066 day. Its host star is a M2.5 dwarf, has a mass of 0.45 ± 0.05 M[SUB]ȯ[/SUB], a radius of 0.43 ± 0.03 R[SUB]ȯ[/SUB] and lies 19.8 ± 0.6 pc away from our Sun. The planet is detected after a radial-velocity campaign using the ESO/Harps spectrograph. GJ 3634b had an a priori geometric probability to undergo transit of ~7% and, if telluric in composition, a non-grazing transit would produce a photometric dip of ≲0.1%. We therefore followed-up upon the RV detection with photometric observations using the 4.5-μm band of the IRAC imager onboard Spitzer. Our six-hour long light curve excludes that a transit occurs for 2σ of the probable transit window, decreasing the probability that GJ 3634b undergoes transit to ~0.5%. Based on observations made with the Harps instrument on the ESO 3.6-m telescope at La Silla Observatory under program IDs 082.C-0718(B) and183.C-0437(A), and observations made with Warm Spitzer under program 60027.Radial-velocity and photometric tables (Tables 2 and 3) are only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via
机译:我们报告检测到GJ 3634b,质量超地球m sin i = 7.0 [SUB] -0.8 [SUP] +0.9 [/ SUP]〜M_⊕[/ SUB],周期P = 2.64561±0.00066天。它的宿主恒星是M2.5矮星,质量为0.45±0.05 M [SUB]ȯ[/ SUB],半径为0.43±0.03 R [SUB]ȯ[/ SUB],相距19.8±0.6 pc我们的太阳。在使用ESO / Harps光谱仪进行径向运动之后检测到该行星。 GJ 3634b的先验几何概率发生〜7%的过渡,并且如果成分为碲,则非放牧过渡将产生produce0.1%的光度下降。因此,我们在Spitzer机上使用IRAC成像仪的4.5μm波段对RV检测进行了光度学观察。我们的六小时长光曲线不包括在可能的透射窗口的2σ处发生过渡,从而将GJ 3634b经历过渡的可能性降低至〜0.5%。基于使用La Silla天文台在ESO 3.6米望远镜上使用Harps仪器在程序ID 082.C-0718(B)和183.C-0437(A)下进行的观测以及使用Warm Spitzer在程序60027下进行的观测。速度和光度表(表2和3)只能通过匿名ftp到cdsarc.u-strasbg.fr(130.79.128.5)或通过CDS以电子形式获得

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