The EBLM project. II. A very hot, low-mass M dwarf in an eccentric and long period eclipsing binary system from SuperWASP
Y. Gómez Maqueo Chew, J. C. Morales, F. Faedi, E. García-Melendo, L. Hebb, F. Rodler, R. Deshpande, S. Mahadevan, J. McCormac, R. Barnes, A. H. M. J. Triaud, M.… 展开作者
Y. Gómez Maqueo Chew, J. C. Morales, F. Faedi, E. García-Melendo, L. Hebb, F. Rodler, R. Deshpande, S. Mahadevan, J. McCormac, R. Barnes, A. H. M. J. Triaud, M. López-Morales, I. Skillen, A. Collier Cameron, M. D. Joner, C. D. Laney, D. C. Stephens, K. G. Stassun, P. Montañés-Rodríguez
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13 pages, 7 figures. Accepted for publication in A&A
In this paper, we derive the fundamental properties of 1SWASPJ011351.29+314909.7 (J0113+31), a metal-poor (-0.40 +/- 0.04 dex), eclipsing binary in an eccentric orbit (~0.3) with an orbital period of ~14.277 d. Eclipsing M dwarfs orbiting solar-type stars (EBLMs), like J0113+31, have been identified from WASP light curves and follow-up spectroscopy in the course of the transiting planet search. We present the first binary of the EBLM sample to be fully analysed, and thus, define here the methodology. The primary component with a mass of 0.945 +/- 0.045 Msun has a large radius (1.378 +/- 0.058 Rsun) indicating that the system is quite old, ~9.5 Gyr. The M-dwarf secondary mass of 0.186 +/- 0.010 Msun and radius of 0.209 +/- 0.011 Rsun are fully consistent with stellar evolutionary models. However, from the near-infrared secondary eclipse light curve, the M dwarf is found to have an effective temperature of 3922 +/- 42 K, which is ~600 K hotter than predicted by theoretical models. We discuss different scenarios to explain this temperature discrepancy. The case of J0113+31 for which we can measure mass, radius, temperature and metallicity, highlights the importance of deriving mass, radius and temperature as a function of metallicity for M dwarfs to better understand the lowest mass stars. The EBLM Project will define the relationship between mass, radius, temperature and metallicity for M dwarfs providing important empirical constraints at the bottom of the main sequence.
The EBLM project XVI. Moderate spin-orbit misalignment of the low mass eclipsing binary EBLM J0021-16
Tufts University(塔夫茨大学);University of Birmingham(伯明翰大学);Massachusetts Institute of Technology(麻省理工学院);Michigan State University(密歇根州立大学);University of Leeds(利兹大学);Keele University(基尔大学);The Ohio State University(俄亥俄州立大学);Jet Propulsion Laboratory, California Institute of Technology(加州理工学院喷气推进实验室);Observatoire Astronomique de l’Université de Genève(日内瓦大学天文台);Universität Bonn, Argelander-Institut für Astronomie(波恩大学阿尔兰德尔天文学研究所)
The EBLM Project XVIII. 3D Obliquities of Five Low-Mass Eclipsing Binaries
Tufts University(塔夫茨大学);University of Birmingham(伯明翰大学);Massachusetts Institute of Technology(麻省理工学院);Michigan State University(密歇根州立大学);University of Leeds(利兹大学);Keele University(基尔大学);The Ohio State University(俄亥俄州立大学);Jet Propulsion Laboratory, California Institute of Technology(加州理工学院喷气推进实验室);Observatoire Astronomique de l’Université de Genève(日内瓦大学天文台)
The EBLM Project I-Physical and orbital parameters, including spin-orbit angles, of two low-mass eclipsing binaries on opposite sides of the Brown Dwarf limit
The EBLM project - XX. Absolute dynamical masses of five low-mass eclipsing binaries, and an evaluation of mass estimation methods
University of Birmingham(伯明翰大学);Thüringer Landessternwarte Tautenburg(图林根州陶滕堡天文台);Keele University(基尔大学);Shanghai Jiao Tong University(上海交通大学);Institut d’astrophysique de Paris(巴黎天体物理研究所);Université Pierre & Marie Curie(皮埃尔和玛丽·居里大学);Tufts University(塔夫茨大学);Uppsala University(乌普萨拉大学)
Period and period change measurements for 143 SuperWASP eclipsing binary candidates near the short-period limit and discovery of a doubly eclipsing quadruple system
The BEBOP radial-velocity survey for circumbinary planets I. Eight years of CORALIE observations of 47 single-line eclipsing binaries and abundance constraints on the masses of circumbinary planets
Fundamental effective temperature measurements for eclipsing binary stars -- III. SPIRou near-infrared spectroscopy and CHEOPS photometry of the benchmark G0V star EBLM J0113+31
The EBLM Project - XIX. The absence of radius inflation in a homogeneous analysis of 66 Northern low-mass eclipsing binaries
University of Birmingham(伯明翰大学);The Ohio State University(俄亥俄州立大学);Center for Astrophysics, Harvard & Smithsonian(哈佛-史密森尼天体物理中心);Keele University(基尔大学);Thüringer Landessternwarte Tautenburg(图林根州陶滕堡天文台);Tsung-Dao Lee Institute, Shanghai Jiao Tong University(上海交通大学李政道研究所);Aix Marseille Univ, CNRS, CNES, LAM(艾克斯-马赛大学);Queen Mary University of London(伦敦玛丽女王大学);Magdalen College, University of Oxford(牛津大学莫德林学院);Universidad Nacional Autónoma de México, Instituto de Astronomía(墨西哥国立自治大学天文学研究所);Hobart and William Smith Colleges(霍巴特和威廉史密斯学院);Institut d’Astrophysique de Paris, CNRS, UMR 7095, Sorbonne Université(巴黎天体物理学研究所);Centre for Exoplanets and Habitability, University of Warwick(华威系外行星与宜居性中心);Department of Physics, University of Warwick(华威大学物理系);Uppsala University(乌普萨拉大学);Univ. Grenoble Alpes, CNRS, IPAG(格勒诺布尔阿尔卑斯大学);Institut für Weltraumforschung, Deutsches Zentrum für Luft- und Raumfahrt(德国航空航天中心空间研究所);European Space Agency (ESA), European Space Astronomy Centre (ESAC)(欧洲航天局欧洲空间天文中心);Stellar Astrophysics Centre, Department of Physics and Astronomy, Aarhus University(奥胡斯大学恒星天体物理学中心);University of Glasgow(格拉斯哥大学)
EBLM XVII - Tidal Synchronization and Circularization in Tight Stellar Binaries
Massachusetts Institute of Technology(麻省理工学院);Tufts University(塔夫茨大学);University of Leeds(利兹大学);Keele University(基尔大学);University of Birmingham(伯明翰大学);University of Warwick(华威大学);Jet Propulsion Laboratory, California Institute of Technology(加州理工学院喷气推进实验室);The Ohio State University(俄亥俄州立大学);Observatoire Astronomique de l’Université de Genève(日内瓦大学天文台);MIT Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology(麻省理工学院卡弗里天体物理学与空间研究研究所)
The EBLM Project V. Physical properties of ten fully convective, very-low-mass stars
在主序星低端的恒星的物理性质的测量是稀缺的。在这方面,我们报告的质量,半径和表面重力的十个非常低质量的恒星在食双星系统,轨道周期的顺序为几天。这些物体探测了完全对流状态下的恒星质量-半径关系,$M_\star \lesssim 0.35$ M $_\odot$,直到氢燃烧质量极限,$M_{\mathrm{HB}} \sim 0.07$ M $_\odot$。WASP巡天探测到这些恒星是凌日的太阳系外行星,它们是低质量的食伴,围绕着更大质量的F型和G型宿主恒星运行。我们使用日食观测的主恒星(TRAPPIST,莱昂哈德欧拉,SPECULOOS望远镜),和主恒星的径向速度(CORALIE摄谱仪),以确定低质量的同伴的物理性质。伴随表面重力是从每个系统的日食和轨道参数导出的。光谱测量的主恒星的有效温度和金属丰度被用来推断主恒星的质量和年龄的恒星演化模型。质量和半径的低质量的同伴,然后来自日食和轨道参数的每个系统。将这些天体与低质量恒星的恒星演化模型进行比较,以测试恒星金属丰度和轨道周期对近距离双星系统中低质量恒星半径的影响。测量是在良好的协议与恒星模型;膨胀的半径低质量恒星相对于模型的预测是有限的1.6 $\pm$-1.2%,在充分的对流制度。10个天体的样本表明低质量恒星的半径与宿主恒星的金属丰度成比例。双星系统的恒星半径和轨道周期之间没有相关性。与文献中可比对象的组合分析与这一结果一致…
Orbital and physical parameters of eclipsing binaries from the All-Sky Automated Survey catalogue - VII. V1200 Centauri: a bright triple in the Hyades moving group
通过对\textit{All Sky Automated Survey}(ASAS)和SuperWASP数据库的光谱观测和光变曲线的分析,给出了V1200~Centauri(ASAS~J135218-3837.3)的轨道和物理参数。利用互相关技术\textsc{todcor},从OUC 50厘米望远镜和PUCHEROS摄谱仪以及1.2米欧拉望远镜和CORALIE摄谱仪获得的高分辨率光谱中计算了径向速度。我们发现系统的绝对参数为$M_1= 1.394\pm 0.030$ M $_\odot$,$M_2= 0.866\pm 0.015$ M $_\odot$,$R_1= 1.39\pm 0.15$ R $_\odot$,$R_2= 1.10\pm 0.25$ R $_\odot$ .我们研究了双星的演化状态和运动学,我们的结果表明V1200~Centauri可能是毕宿星移动群的成员,但大部分膨胀的次级半径可能表明该系统可能更年轻,大约3000万年。我们还发现,食对是由另一个恒星质量的物体在351天的轨道上运行的,这对于等级三元组来说是不寻常的短。这使得V1200 Cen成为测试多颗恒星形成模型的潜在目标。
Orbital and physical parameters of eclipsing binaries from the All-Sky Automated Survey catalogue - VI. AK Fornacis - a rare, bright K-type eclipsing binary
我们提出了一个明亮的(V=9.14),附近(d=31秒差距),晚型分离食二进制AK天炉座的光度和光谱分析相结合的结果。这个P=3.981 d的系统以前没有被认为是双线光谱双星,这是这个独特目标的第一个完整的物理模型。利用FEROS、CORALIE和HARPS摄谱仪,我们收集了一些高分辨率的光谱,以计算双星两个组成部分的径向速度。测量是用我们自己的解缠程序和TODCOR技术完成的,后来又与ASAS和SuperWASP档案中的光度法相结合。我们还使用Spectroscopy Made Easy(SME)软件包对组分光谱进行了大气分析。我们的分析表明,AK For由两个活跃的冷矮星组成,质量分别为$M_1=0.6958 \pm 0.0010$和$M_2=0.6355 \pm 0.0007$ M $_\odot$,半径分别为$R_1=0.687 \pm 0.020$和$R_2=0.609 \pm 0.016$ R $_\odot$,金属丰度略低于太阳。两个组件的参数都很好地再现了模型。AK For是已知的K型或M型食双星中最亮的系统。它的轨道周期是最长的之一,旋转速度是最低的之一,这使我们能够获得非常精确的径向速度测量。物理参数的精度,我们得到的地方AK的二进制文件中最好的质量测量在文献中。它还填补了我们对0.5-0.8 M $_\odot$范围内的恒星以及短周期和长周期系统的知识空白。所…