arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2008.09832astro-ph.EPastro-ph.IMastro-ph.SR
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在南黄道半球的TESS全幅图像中寻找围绕FGKM矮星和次巨星的凌日行星

A search for transiting planets around FGKM dwarfs and sub-giants in the TESS Full Frame Images of the Southern ecliptic hemisphere

M. Montalto, L. Borsato, V. Granata, G. Lacedelli, L. Malavolta, E. E. Manthopoulou, D. Nardiello, V. Nascimbeni, G. Piotto

摘要:

在这项工作中,我们提出了976 814 FGKM矮星和亚巨星的TESS全帧图像(FFI)的南黄道半球的分析。我们提出了一个新的管道,DIAmante,开发用于从TESS FFI和分类器中提取优化的多扇区测光,该分类器基于随机森林技术,经过训练,可以从常见的误报中区分可能的过境行星候选者。开发了一种新的统计模型,以提供正确识别变异性来源的概率。我们将行星搜索限制在位于天空中最不拥挤区域的恒星上,并确定了396颗凌日行星候选者,其中252颗是新发现的。候选人的半径分布范围在1 R $\rm_{\oplus}$和2.6 R $\rm_J$之间,中值为1 R $\rm_J$,周期分布范围在0.25天和105天之间,中值为3.8天。样本包含4个长周期候选者(P>50天),其中一个是新的,64个候选者的周期在10到50天之间(42个新的)。在小行星半径区域(R<4 R $\rm_{\oplus}$),我们发现了39个候选行星,其中15个是新发现的。此外,我们提出了15个单一的过境事件(14个新的),一个新的候选人多行星系和一个新的候选人周围的一个已知的TOI。通过使用{ \it盖亚}动力学约束,我们发现,70个对象显示的二元性的证据。我们通过MAST和ExoFOP门户网站发布了我们分析的对象的目录以及相应的光变曲线和诊断图。

英文摘要:

In this work, we present the analysis of 976 814 FGKM dwarf and sub-giant stars in the TESS Full Frame Images (FFIs) of the Southern ecliptic hemisphere. We present a new pipeline, DIAmante, developed to extract optimized, multi-sector photometry from TESS FFIs and a classifier, based on the Random Forest technique, trained to discriminate plausible transiting planetary candidates from common false positives. A new statistical model was developed to provide the probability of correct identification of the source of variability. We restricted the planet search to the stars located in the least crowded regions of the sky and identified 396 transiting planetary candidates among which 252 are new detections. The candidates' radius distribution ranges between 1 R$\rm_{\oplus}$ and 2.6 R$\rm_J$ with median value of 1 R$\rm_J$ and the period distribution ranges between 0.25 days and 105 days with median value of 3.8 days. The sample contains four long period candidates (P>50 days) one of which is new and 64 candidates with periods between 10 and 50 days (42 new ones). In the small planet radius domain (R<4 R$\rm_{\oplus}$) we found 39 candidates among which 15 are new detections. Additionally, we present 15 single transit events (14 new ones), a new candidate multi-planetary system and a novel candidate around a known TOI. By using {\it Gaia} dynamical constraints we found that 70 objects show evidence of binarity. We release a catalog of the objects we analyzed and the corresponding lightcurves and diagnostic figures through the MAST and ExoFOP portals.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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