AI 中文总结
SOAR TESS巡天III通过观测2982个目标，发现TESS行星候选体周围50au、100au范围内伴星数量显著低于场星预期，伴星缺失随距离减弱，M型矮星主星也存在类似缺失，这会降低行星产量。
AI 中文摘要
我们基于HRCam散斑观测对2982个目标开展累积SOAR TESS巡天，报告巡天II之后获得的433个伴星测量结果。在1199个矮星主星的人口统计样本中，我们在考虑每个观测的探测限后，将探测到的次星与主星质量比q=M₂/M₁≥0.4的伴星与场星群体进行比较。我们发现50天文单位（au）范围内有24个伴星，而预期值为84.8个；100au范围内有48个伴星，预期值为124.4个。相对于场星预期的伴星频率为S₅₀au=0.291⁺⁰·⁰⁶²₋₀·₀₅₄和S₁₀₀au=0.391⁺⁰·⁰⁵⁸₋₀·₀₅₃。一个伴星缺失随分离距离减弱的连续模型，在a₅₀=74au（57-101au）处达到密近双星抑制率与场星率的中点。与Gaia匹配的子样本包含88个伴星，预期值为69.6个，在考虑场星比较和Gaia选择的不确定性后，该差异与模型一致。一个保留双星总数但将场星分布向100au偏移的模型拟合效果差。在所有保留的行星都绕目录主星运行的限制假设下，拟合规律意味着q≥0.4时体积受限行星产量减少17.0%，扩展到所有质量比时减少23.3%。M型矮星主星显示出类似的密近伴星缺失，但样本量较小，无法与太阳型主星进行精确比较。
英文摘要
We present the cumulative SOAR TESS Survey, based on HRCam speckle observations of 2,982 targets, and report 433 companion measurements obtained after Survey II. In a demographic sample of 1,199 dwarf primaries, we compare detected companions with secondary-to-primary mass ratios $q=M_2/M_1\geq0.4$ to a field-star population after accounting for each observation's detection limits. We find 24 companions within 50 au versus 84.8 expected and 48 within 100 au versus 124.4 expected. The companion frequencies relative to the field expectation are $S_{50\,{\rm au}}=0.291^{+0.062}_{-0.054}$ and $S_{100\,{\rm au}}=0.391^{+0.058}_{-0.053}$. A continuous model in which the deficit weakens with separation reaches the midpoint between close-binary suppression and the field rate at $a_{50}=74$ au (57--101 au). The Gaia-matched subset contains 88 companions versus 69.6 expected, a difference consistent with the model once uncertainties in the field comparison and Gaia selection are included. A model that preserves the total number of binaries but shifts the field distribution toward 100 au fits poorly. Under the limiting assumption that all retained planets orbit the catalog primary, the fitted law implies reductions of 17.0\% in volume-limited planet yield over $q\geq0.4$ and 23.3\% when extended to all mass ratios. M-dwarf hosts show a similar close-companion deficit, but the smaller sample prevents a precise comparison with solar-type hosts.
Comments48 pages, 22 figures, and 11 tables. Submitted to AJ
