We present a large sample of new members of the Taurus star-forming region that extend from stellar to planetary masses. To identify candidate members at substellar masses, we have used color-magnitude diagrams and proper motions measured with several wide-field optical and infrared (IR) surveys. At stellar masses, we have considered the candidate members that were found in a recent analysis of high-precision astrometry from the Gaia mission. Using new and archival spectra, we have measured spectral types and assessed membership for these 161 candidates, 79 of which are classified as new members. Our updated census of Taurus now contains 519 known members. According to Gaia data, this census should be nearly complete for spectral types earlier than M6-M7 at A J < 1. For a large field encompassing ~ 72% of the known members, the census should be complete for K < 15.7 at A J < 1.5, which corresponds to ~ 5-13 M Jup for ages of 1-10 Myr based on theoretical evolutionary models. Our survey has doubled the number of known members at ≥M9 and has uncovered the faintest known member in M K , which should have a mass of ~3-10 ~ M Jup for ages of 1-10 Myr. We have used mid-IR photometry from the Spitzer Space Telescope and the Wide-field Infrared Survey Explorer to determine whether the new members exhibit excess emission that would indicate the presence of circumstellar disks. The updated disk fraction for Taurus is ~0.7 at ≤M3.5 and ~0.4 at >M3.5.

中文翻译：

---

对金牛座新成员从恒星到行星质量的调查

我们展示了金牛座恒星形成区域的新成员的大量样本，该区域从恒星质量延伸到行星质量。为了识别亚恒星质量的候选成员，我们使用了颜色星等图和通过几次广域光学和红外（IR）调查测量的自行。在恒星质量方面，我们考虑了在最近对盖亚任务的高精度天体测量分析中发现的候选成员。使用新的和档案的光谱，我们测量了光谱类型并评估了这 161 个候选者的成员资格，其中 79 个被归类为新成员。我们更新的金牛座人口普查现在包含 519 名已知成员。根据盖亚数据，对于 AJ < 1 时早于 M6-M7 的光谱类型，本次普查应该接近完成。对于包含约 72% 已知成员的大领域，对于 AJ < 1.5 时 K < 15.7 的普查应该已完成，根据理论进化模型，对应于 1-10 Myr 年龄的 ~ 5-13 M Jup。我们的调查使 ≥M9 的已知成员数量增加了一倍，并发现了 MK 中最微弱的已知成员，其质量应为 ~3-10 ~ M Jup，年龄为 1-10 Myr。我们使用斯皮策太空望远镜和广域红外巡天探测器的中红外光度测量来确定新成员是否表现出过量的发射，这表明星周盘的存在。更新后的金牛座圆盘分数在 ≤M3.5 时约为 0.7，在 >M3.5 时约为 0.4。