标题： WASP-12b的近红外热辐射：Ks、H和J波段次食的探测 显示英文标题

标题： Near-infrared Thermal Emission from WASP-12b: detections of the secondary eclipse in Ks, H & J

摘要： 我们利用加拿大-法国-夏威夷望远镜上的广域红外相机，给出了WASP-12b的非常高度受照热木星在Ks波段、H波段和J波段的测光观测。 我们的测光观测在Ks和H波段包围了WASP-12b的二次食，并且在J波段从中期食开始，持续到食结束之后。 我们在所有三个近红外波段都探测到了它的热发射。 我们的二次食深度分别是：Ks波段（24σ）为0.309 ± 0.013%，H波段（9σ）为0.176 ± 0.020%，J波段（4σ）为0.131 ± 0.028%。 这三个二次食都用一致的相位拟合，该相位与圆形轨道兼容。 通过结合我们和其他文献中发布的二次食时间，以及该系统的径向速度和凌日时间数据，我们显示没有证据表明WASP-12b正在以可检测的速率进动，并且其轨道偏心率很可能为零。 我们的热发射测量还允许我们限制该行星大气的特性；我们的Ks波段食深支持这种非常高度受照的热木星的热量从白天到夜晚的再分布效率低，并且具有低邦德反照率。 J和H波段的亮度温度略低于Ks波段的亮度温度，因此暗示WASP-12b大气深处可能存在适度的温度反转；我们的J和H波段观测所探及的高压力、深层大气层可能比更高海拔的层更均匀。 最后，我们最佳拟合的Ks波段食具有稍微长一些的持续时间；这可能是行星因潮汐作用而失去物质的初步证据——Li及其同事曾预测过这种情况，而Fossati及其同事最近可能提供了观测确认。 显示英文摘要

摘要： We present Ks, H & J-band photometry of the very highly irradiated hot Jupiter WASP-12b using the Wide-field Infrared Camera on the Canada-France-Hawaii telescope. Our photometry brackets the secondary eclipse of WASP-12b in the Ks and H-bands, and in J-band starts in mid-eclipse and continues until well after the end of the eclipse. We detect its thermal emission in all three near-infrared bands. Our secondary eclipse depths are 0.309 +/- 0.013% in Ks-band (24-sigma), 0.176 +/- 0.020% in H-band (9-sigma) and 0.131 +/- 0.028% in J-band (4-sigma). All three secondary eclipses are best-fit with a consistent phase that is compatible with a circular orbit. By combining our secondary eclipse times with others published in the literature, as well as the radial velocity and transit timing data for this system, we show that there is no evidence that WASP-12b is precessing at a detectable rate, and show that its orbital eccentricity is likely zero. Our thermal emission measurements also allow us to constrain the characteristics of the planet's atmosphere; our Ks-band eclipse depth argues in favour of inefficient day to nightside redistribution of heat and a low Bond albedo for this very highly irradiated hot Jupiter. The J and H-band brightness temperatures are slightly cooler than the Ks-band brightness temperature, and thus hint at the possibility of a modest temperature inversion deep in the atmosphere of WASP-12b; the high pressure, deep atmospheric layers probed by our J and H-band observations are likely more homogenized than the higher altitude layer. Lastly, our best-fit Ks-band eclipse has a marginally longer duration than would otherwise be expected; this may be tentative evidence for material being tidally stripped from the planet - as was predicted for this system by Li & collaborators, and for which observational confirmation was recently arguably provided by Fossati & collaborators.