标题： TESS-盖亚光曲线：基于PSF的TESS FFI光曲线产品 显示英文标题

标题： TESS-Gaia Light Curve: a PSF-based TESS FFI light curve product

摘要： 凌日系外行星巡天卫星（TESS）在完成了55个扇区的观测后，正在继续其第二个扩展任务。 TESS以1800秒、600秒或200秒的周期发布全帧图像（FFI），使得除了少数预选星之外的其他恒星也能提取出光变曲线。 模拟结果显示，在这些FFI光变曲线中可以发现数千颗系外行星、掩食双星、变星以及其他天体暂现源。 为了获得高精度的光变曲线，我们使用有效的点扩散函数对FFI进行了前向建模，以去除邻近恒星的污染。 我们采用Gaia DR3中的恒星位置和星等作为先验信息。 所得光变曲线被称为TESS-Gaia光变曲线（TGLC），其测光精度与发射前预测的噪声水平紧密吻合。 即使在拥挤的星场中，TGLC的测光精度在第16等TESS星等处仍能达到约2%。 我们通过米库尔斯基空间望远镜档案馆（MAST）为所有可用扇区的第16等及更暗的恒星发布了TGLC的孔径和PSF光变曲线，并将继续通过DOI: 10.17909/610m-9474提供未来的光变曲线。 开源包tglc已公开发布，以便任何用户都能生成定制化的光变曲线。 显示英文摘要

摘要： The Transiting Exoplanet Survey Satellite (TESS) is continuing its second extended mission after 55 sectors of observations. TESS publishes full-frame images (FFI) at a cadence of 1800, 600, or 200 seconds, allowing light curves to be extracted for stars beyond a limited number of pre-selected stars. Simulations show that thousands of exoplanets, eclipsing binaries, variable stars, and other astrophysical transients can be found in these FFI light curves. To obtain high-precision light curves, we forward model the FFI with the effective point spread function to remove contamination from nearby stars. We adopt star positions and magnitudes from Gaia DR3 as priors. The resulting light curves, called TESS-Gaia Light Curves (TGLC), show a photometric precision closely tracking the pre-launch prediction of the noise level. TGLC's photometric precision reaches <~2% at 16th TESS magnitude even in crowded fields. We publish TGLC Aperture and PSF light curves for stars down to 16th TESS magnitude through the Mikulski Archive for Space Telescopes (MAST) for all available sectors and will continue to deliver future light curves via DOI: 10.17909/610m-9474. The open-source package tglc is publicly available to enable any user to produce customized light curves.