Ten new, ultracompact triply eclipsing triple star systems
T. Borkovits, S. A. Rappaport, T. Mitnyan, R. Gagliano, T. Jacobs, B. Powell, V. Kostov, M. Omohundro, M. H. Kristiansen, I. Terentev, H. M. Schwengeler, D. LaC… 展开作者
T. Borkovits, S. A. Rappaport, T. Mitnyan, R. Gagliano, T. Jacobs, B. Powell, V. Kostov, M. Omohundro, M. H. Kristiansen, I. Terentev, H. M. Schwengeler, D. LaCourse, Z. Garai, T. Pribulla, I. B. Bíró, I. Csányi, Z. Dencs, A. Pál
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Accepted for publication in Astronomy and Astrophysics
We have identified more than a hundred close triply eclipsing hierarchical triple star systems from data taken with the space telescope TESS. Many of them have outer periods less than or, close to 100 days, hence, we call them `ultracompact hierarchical triples'. These systems are noteworthy in that we can potentially determine their dynamical and astrophysical parameters with a high precision, in many cases even without radial velocity data. In the present paper we report the comprehensive study of ten new ultracompact triply eclipsing triple star systems, located in the northern ecliptic hemisphere, taken from this larger sample: TICs 198581208, 265274458, 283846096, 337993842, 351404069, 378270875, 403792414, 403916758, 405789362, 461500036.
Most of the data for this study come from TESS observations, but we obtained supplemental ground-based photometric measurements for two of the systems. The eclipse timing variation curves extracted from the TESS and the ground-based follow up data, the photometric light curves, and the spectral energy distribution are combined in a complex photodynamical analysis to yield the stellar and orbital parameters of all ten systems.
The outer periods are in the range of 46.8-101.4 days. We found third-body forced, rapid apsidal motion in four systems. Moreover, TIC 403916758 was found to be a double twin triple (i.e. both the inner and the outer mass ratios are close to unity). All of the systems are substantially flat, with mutual inclination angles of $<5^o$. Finally, we have taken the results for the ten systems in the present paper, and combined them with the system parameters for more than 30 other compact triples that we have reported on in previous work, in order to examine some of the global properties of these systems on a statistical basis.
在这项工作中,我们报告了TESS任务中发现的9个新的紧凑型三重食三星系统的独立发现和分析:TIC 47151245,81525800,99013269,229785001,276162169,280883908,294803663,332521671和356324779。这九个系统中的每一个都表现出不同的第三体食,其中第三颗(“第三”)恒星遮住了内食双星(EB),反之亦然。我们利用光动力学分析的TESS测光,档案测光数据,TESS日食时间的变化的EB,可用的档案光谱能量分布曲线(SED),并在某些情况下,新获得的径向速度观测,解决所有三颗恒星的参数,以及大多数的轨道要素。从这些分析中,我们发现所有九个系统的外轨道几乎都是边缘上的(即,在$\lesssim 4^\circ$内),并且6个系统与$5^\circ$内共面;其它系统具有$20^\circ$、$41^\circ$和可能的$179^\circ$的相互倾斜角(即,逆行外轨道)。外轨道周期从47.8天到604天不等,偏心率从0.004到0.61。所有18颗EB星的质量都在0.9-2.6 M $_\odot$之间,并且大多位于主序星附近。相比之下,第三恒星的质量和半径分别为1.4-2.8 M $_\odot$和1.5-13 R $_\odot$。我们利用这9个系统的系统参数,再加上那些从以前公布的紧凑的三重食三重,以获得一些统计洞察…
Dynamical masses, absolute radii and 3D orbits of the triply eclipsing star HD 181068 from Kepler photometry
HD 181068是开普勒视野中两颗已知的三重食三星中较亮的一颗。它已被开普勒太空望远镜连续观测了两年多。在九个四分之一的数据中,有三个是在短节奏模式下获得的,即每58.9秒一个点。在这里,我们分析这个独特的数据集,以确定绝对的物理参数(最重要的是质量和半径)和完整的轨道配置使用一个复杂的新方法。我们测量日食的时间变化(ETVs),然后结合单线径向速度测量,以产生相当于双线光谱双星的方式质量。我们还开发了一个新的光变曲线合成代码,用于模拟三重互食和变化的潮汐场对恒星表面和相对论多普勒波束的影响。通过结合ETV研究的恒星质量和同步光变曲线分析,我们确定了这三颗恒星的绝对半径。我们的结果表明,封闭和广泛的子系统几乎完全共面和共面轨道旋转。新确定的参数绘制了系统的一致图片,其中包含以前无法获得的细节。
Six New Compact Triply Eclipsing Triples Found With TESS
在这项工作中,我们报告了TESS任务中发现的六个新的紧凑的三重食三星系统的发现和分析:TIC 37743815,42565581,54060695,178010808,242132789和456194776。所有这些都表现出明显的第三体食,其中内食双星(EB)掩盖了第三颗(“第三”)恒星,反之亦然。我们利用TESS测光,档案测光数据和可用的档案光谱能量分布曲线(SED)来解决所有三颗恒星的属性,以及许多轨道要素。我们详细描述了我们的SED适合,搜索的档案数据外轨道周期,和最终的全球光动力学分析。从这些分析中,我们发现所有六个系统在$0^\circ$ - $5^\circ$内共面,并且几乎在边缘上观察(即,在两个温度范围内)。这六个系统的外轨道周期和偏心率分别为{ $P_{\rm out}$(天),$e$ }:{68.7,0.36},{123,0.16},{60.7,0.01},{69.0,0.29},{41.5,0.01},{93.9,0.29},按照上面列出的源的顺序。所有12颗EB星的质量都在0.7-1.8 M $_\odot$之间,并且都位于主序星附近。相比之下,第三恒星的质量和半径分别为1.5-2.3 M $_\odot$和2.9-12 R $_\odot$。我们利用这些信息来估计紧平坦三元系的出现率。
TIC 295741342: A Triply-Eclipsing Triple Star System with a Giant Tertiary
NASA Goddard Space Flight Center(NASA戈达德太空飞行中心);SETI Institute(地外文明研究所);Department of Physics, Kavli Institute for Astrophysics and Space Research, M.I.T.(麻省理工学院物理系、卡弗里天体物理学与空间研究研究所);Baja Astronomical Observatory of University of Szeged(塞格德大学巴亚天文台);HUN-REN – SZTE Stellar Astrophysics Research Group(匈牙利研究与教育网络-塞格德大学恒星天体物理学研究组);Konkoly Observatory, Research Centre for Astronomy and Earth Sciences(孔科利天文台,地球科学研究中心)