Six transiting planets and a chain of Laplace resonances in TOI-178
A. Leleu, Y. Alibert, N. C. Hara, M. J. Hooton, T. G. Wilson, P. Robutel, J. -B. Delisle, J. Laskar, S. Hoyer, C. Lovis, E. M. Bryant, E. Ducrot, J. Cabrera, L.… 展开作者
A. Leleu, Y. Alibert, N. C. Hara, M. J. Hooton, T. G. Wilson, P. Robutel, J. -B. Delisle, J. Laskar, S. Hoyer, C. Lovis, E. M. Bryant, E. Ducrot, J. Cabrera, L. Delrez, J. S. Acton, V. Adibekyan, R. Allart, C. Allende Prieto, R. Alonso, D. Alves, D. R. Anderson, D. Angerhausen, G. Anglada Escudé, J. Asquier, D. Barrado, S. C. C. Barros, W. Baumjohann, D. Bayliss, M. Beck, T. Beck, A. Bekkelien, W. Benz, N. Billot, A. Bonfanti, X. Bonfils, F. Bouchy, V. Bourrier, G. Boué, A. Brandeker, C. Broeg, M. Buder, A. Burdanov, M. R. Burleigh, T. Bárczy, A. C. Cameron, S. Chamberlain, S. Charnoz, B. F. Cooke, C. Corral Van Damme, A. C. M. Correia, S. Cristiani, M. Damasso, M. B. Davies, M. Deleuil, O. D. S. Demangeon, B. -O. Demory, P. Di Marcantonio, G. Di Persio, X. Dumusque, D. Ehrenreich, A. Erikson, P. Figueira, A. Fortier, L. Fossati, M. Fridlund, D. Futyan, D. Gandolfi, A. García Muñoz, L. J. Garcia, S. Gill, E. Gillen, M. Gillon, M. R. Goad, J. I. González Hernández, M. Guedel, M. N. Günther, J. Haldemann, B. Henderson, K. Heng, A. E. Hogan, K. Isaak, E. Jehin, J. S. Jenkins, A. Jordán, L. Kiss, M. H. Kristiansen, K. Lam, B. Lavie, A. Lecavelier des Etangs, M. Lendl, J. Lillo-Box, G. Lo Curto, D. Magrin, C. J. A. P. Martins, P. F. L. Maxted, J. McCormac, A. Mehner, G. Micela, P. Molaro, M. Moyano, C. A. Murray, V. Nascimbeni, N. J. Nunes, G. Olofsson, H. P. Osborn, M. Oshagh, R. Ottensamer, I. Pagano, E. Pallé, P. P. Pedersen, F. A. Pepe, C. M. Persson, G. Peter, G. Piotto, G. Polenta, D. Pollacco, E. Poretti, F. J. Pozuelos, D. Queloz, R. Ragazzoni, N. Rando, F. Ratti, H. Rauer, L. Raynard, R. Rebolo, C. Reimers, I. Ribas, N. C. Santos, G. Scandariato, J. Schneider, D. Sebastian, M. Sestovic, A. E. Simon, A. M. S. Smith, S. G. Sousa, A. Sozzetti, M. Steller, A. Suárez Mascareño, Gy. M. Szabó, D. Ségransan, N. Thomas, S. Thompson, R. H. Tilbrook, A. Triaud, O. Turner, S. Udry, V. Van Grootel, H. Venus, F. Verrecchia, J. I. Vines, N. A. Walton, R. G. West, P. J. Wheatley, D. Wolter, M. R. Zapatero Osorio
Determining the architecture of multi-planetary systems is one of the cornerstones of understanding planet formation and evolution. Resonant systems are especially important as the fragility of their orbital configuration ensures that no significant scattering or collisional event has taken place since the earliest formation phase when the parent protoplanetary disc was still present. In this context, TOI-178 has been the subject of particular attention since the first TESS observations hinted at a 2:3:3 resonant chain. Here we report the results of observations from CHEOPS, ESPRESSO, NGTS, and SPECULOOS with the aim of deciphering the peculiar orbital architecture of the system. We show that TOI-178 harbours at least six planets in the super-Earth to mini-Neptune regimes, with radii ranging from 1.152(-0.070/+0.073) to 2.87(-0.13/+0.14) Earth radii and periods of 1.91, 3.24, 6.56, 9.96, 15.23, and 20.71 days. All planets but the innermost one form a 2:4:6:9:12 chain of Laplace resonances, and the planetary densities show important variations from planet to planet, jumping from 1.02(+0.28/-0.23) to 0.177(+0.055/-0.061) times the Earth's density between planets c and d. Using Bayesian interior structure retrieval models, we show that the amount of gas in the planets does not vary in a monotonous way, contrary to what one would expect from simple formation and evolution models and unlike other known systems in a chain of Laplace resonances. The brightness of TOI-178 allows for a precise characterisation of its orbital architecture as well as of the physical nature of the six presently known transiting planets it harbours. The peculiar orbital configuration and the diversity in average density among the planets in the system will enable the study of interior planetary structures and atmospheric evolution, providing important clues on the formation of super-Earths and mini-Neptunes.
RV and TTV Measurements of Two Transiting Long-Period Giants around TOI-4600
Tsinghua University（清华大学）；Nanjing University（南京大学）；The University of New Mexico（新墨西哥大学）；University of Chicago（芝加哥大学）；University of Arizona（亚利桑那大学）；Peking University（北京大学）；Westlake University（西湖大学）
TOI-7510: A solar-analog system of three transiting giant planets near a Laplace resonance chain
Monash University（莫纳什大学）；Univ. Grenoble Alpes（格勒诺布尔阿尔卑斯大学）；Princeton University（普林斯顿大学）；NASA Ames Research Center（美国国家航空航天局艾姆斯研究中心）；University of Birmingham（伯明翰大学）
TOI-4616 b: a benchmark Earth-sized planet transiting a nearby M4 dwarf
University of Bern（伯尔尼大学）；Universidad Nacional Autónoma de México, Instituto de Astronomía（墨西哥国立自治大学天文研究所）；Université de Liége（列日大学）；University of Birmingham（伯明翰大学）；Instituto de Astrofísica de Andalucía (IAA-CSIC)（安达卢西亚天体物理学研究所（CSIC））；Massachusetts Institute of Technology（麻省理工学院）；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）；Cavendish Laboratory（卡文迪许实验室）；ETH Zürich（苏黎世联邦理工学院）
The sensitivity of TESS to transiting planets in TOIs with close-in stellar companions
Bay Area Environmental Research Institute（湾区环境研究所）；Mount Holyoke College（蒙特霍利克学院）；NASA Exoplanet Science Institute, Caltech/IPAC（NASA系外行星科学研究所，加州理工学院/IPAC）；NASA Ames Research Center（NASA艾姆斯研究中心）
From Earths to Super-Earths: Five New Small Planets Transiting M Dwarf Stars
California Institute of Technology（加州理工学院）；Carnegie Institution for Science（卡内基科学研究所）；University of California, Los Angeles（加利福尼亚大学洛杉矶分校）；Yale University（耶鲁大学）；University of California at Berkeley（加利福尼亚大学伯克利分校）；Jet Propulsion Laboratory, California Institute of Technology（加州理工学院喷气推进实验室）；NASA Exoplanet Science Institute, IPAC, California Institute of Technology（NASA系外行星科学研究所/IPAC/加州理工学院）；Sternberg Astronomical Institute, M.V. Lomonosov Moscow State University（列别捷夫天文研究所/莫斯科国立罗蒙诺索夫大学）；Princeton University（普林斯顿大学）；Flatiron Institute（平顿研究所）；The University of Tokyo（东京大学）；Massachusetts Institute of Technology（麻省理工学院）；University of Bern（伯尔尼大学）；Union College（联合学院）；NASA Ames Research Center（NASA艾姆斯研究中心）；SETI Institute（搜寻地外文明研究所）；University of St. Andrews（圣安德鲁斯大学）；Université de Liège（列日大学）
A 34.6-day transiting sub-Neptune in the TOI-1422 planetary system
INAF – Osservatorio Astrofisico di Torino（意大利国家天体物理研究所都灵天文台）；Dipartimento di Fisica, Università di Trento（特伦托大学物理系）；Dipartimento di Fisica e Astronomia, Università degli Studi di Padova（帕多瓦大学物理与天文学系）；Institute for Particle Physics and Astrophysics, ETH Zürich（苏黎世联邦理工学院粒子物理与天体物理研究所）；Space sciences, Technologies and Astrophysics Research (STAR) Institute, Université de Liège（列日大学空间科学、技术与天体物理研究（STAR）研究所）；Astrobiology Research Unit, Université de Liège（列日大学天体生物学研究组）；Department of Physics, University of Rome “Tor Vergata”（罗马托尔维加塔大学物理系）；Max Planck Institute for Astronomy（马克斯·普朗克天文学研究所）；INAF – Osservatorio Astronomico di Palermo（意大利国家天体物理研究所巴勒莫天文台）；Fundación Galileo Galilei - INAF（伽利略基金会-意大利国家天体物理研究所）
Characterization of two new transiting sub-Neptunes and a terrestrial planet around M-dwarf hosts
Instituto de Astrofísica de Canarias (IAC)（加那利群岛天体物理研究所）；Department of Physics, Aristotle University of Thessaloniki（萨洛尼基亚里士多德大学物理系）；Departamento de Astrofísica, Universidad de La Laguna (ULL)（拉帕尔马拉古纳大学天体物理学系）；INAF - Osservatorio Astrofisico di Torino（意大利国家天体物理研究所都灵天文台）；Dipartimento di Fisica “Ettore Pancini”, Università di Napoli Federico II（那不勒斯费德里科二世大学埃托雷·潘奇尼物理系）；INFN, Sezione di Napoli（意大利国家核物理研究所那不勒斯分部）；INAF - Osservatorio Astronomico di Capodimonte（意大利国家天体物理研究所卡波迪蒙特天文台）；Centro de Astrobiología (CSIC-INTA)（天体生物学中心（西班牙高等科学研究委员会-国家航空航天技术研究所））
TOI-836: A super-Earth and mini-Neptune transiting a nearby K-dwarf
我们使用TESS Sector 11和Sector 38的数据发现了两颗经过TOI-836（TIC 440887364）的系外行星。TOI-836是一颗明亮的K矮星（$T = 8.5$等），高自行（$\sim\,200$ mas yr $^{-1}$），低金属量（[Fe/H] $\approx\,-0.28$），质量为$0.68\pm0.05$ M $_{\odot}$，半径为$0.67\pm0.01$ R $_{\odot}$。我们获得光度跟踪观测与各种设施，我们使用这些数据集，以确定内行星，TOI-836 b，是一个$1.70\pm0.07$ R $_{\oplus}$超级地球在3.82天的轨道，把它直接在所谓的“半径谷”。外行星TOI-836 c是一颗$2.59\pm0.09$ R $_{\oplus}$迷你海王星，公转周期为8.60天。径向速度测量显示TOI-836 b的质量为$4.5\pm0.9$ M $_{\oplus}$，而TOI-836 c的质量为$9.6\pm2.6$ M $_{\oplus}$。测光观测显示，TOI-836 c的凌日时间变化（TTV）约为20分钟，但TOI-836 b没有可检测到的TTV。行星TOI-836 c的TTV可能是由一颗未被发现的外部行星造成的。
TOI-3288 b and TOI-4666 b: two gas giants transiting low-mass stars characterised by NIRPS
European Southern Observatory (ESO)（欧洲南方天文台）；Institut Trottier de recherche sur les exoplanètes, Département de Physique, Université de Montréal（蒙特利尔大学物理系特罗蒂尔系外行星研究所）；Departamento de Física Teórica e Experimental, Universidade Federal do Rio Grande do Norte（北里奥格兰德联邦大学理论与实验物理系）；Instituto de Astrofísica e Ciências do Espaço, Universidade do Porto, CAUP（波尔图大学葡萄牙天体物理和空间科学研究所）；Observatoire du Mont-Mégantic（梅冈蒂克山天文台）；Univ. Grenoble Alpes, CNRS, IPAG（格勒诺布尔阿尔卑斯大学法国国家科学研究中心IPAG实验室）
