K2 III中的超短周期行星：在战役0-8，10中，13个新的多行星系统和10个新验证的行星的邻居是常见的
Ultra Short Period Planets in K2 III: Neighbors are Common with 13 New Multi-Planet Systems and 10 Newly Validated Planets in Campaigns 0-8, 10
摘要：
使用EVEREST测光管道，我们在K2数据的前半部分（活动0-8和10）中确定了74个候选超短周期行星（轨道周期P<1 d）。其中，33名候选人以前没有被报告过。对其他凌日行星的系统搜索发现了13个新的多行星系统，是已知数量的两倍，占USP的三分之一（32%）。我们还确定了30名同伴，其周期为1.4至31天（中位数5.5天）。三分之一（104个中的36个）的候选USP和伴随物已经过统计学验证或确认，其中10个是首次验证或确认，包括7个USP。几乎所有的候选行星，以及所有确认的行星，都是小的（半径Rp<=3 R_E），中位半径R_p=1.1 R_E;确认和确认的候选行星半径在0.4 R_E和2.4 R_E之间，周期在P=0.18到0.96 d之间。缺乏候选者（a）超热行星（R_p>10 R_E）和（b）短周期沙漠行星（3<= R_p <=10 R_E）表明这两个种群都很罕见，尽管我们的调查可能错过了一些非常深的凌日。这些结果也提供了强有力的证据，证明我们还没有达到行星半径分布的下限，并表明测光技术的进一步改进将产生更多的超短周期行星。已知多行星系统中的大部分USP支持起源模型，该模型涉及与外部行星的动力学相互作用以及USP轨道的潮汐衰减。
英文摘要：
Using the EVEREST photometry pipeline, we have identified 74 candidate ultra-short-period planets (orbital period P<1 d) in the first half of the K2 data (Campaigns 0-8 and 10). Of these, 33 candidates have not previously been reported. A systematic search for additional transiting planets found 13 new multi-planet systems, doubling the number known and representing a third (32%) of USPs. We also identified 30 companions, which have periods from 1.4 to 31 days (median 5.5 d). A third (36 of 104) of the candidate USPs and companions have been statistically validated or confirmed, 10 for the first time, including 7 USPs. Almost all candidates, and all validated planets, are small (radii Rp<=3 R_E) with a median radius of R_p=1.1 R_E; the validated and confirmed candidates have radii between 0.4 R_E and 2.4 R_E and periods from P=0.18 to 0.96 d. The lack of candidate (a) ultra-hot-Jupiters (R_p>10 R_E) and (b) short-period desert (3<=Rp<=10 R_E) planets suggests that both populations are rare, although our survey may have missed some of the very deepest transits. These results also provide strong evidence that we have not reached a lower limit on the distribution of planetary radius values for planets at close proximity to a star, and suggest that additional improvements in photometry techniques would yield yet more ultra-short-period planets. The large fraction of USPs in known multi-planet systems supports origins models that involve dynamical interactions with exterior planets coupled to tidal decay of the USP orbits.
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