Planet Hunters TESS I: TOI 813, a subgiant hosting a transiting Saturn-sized planet on an 84-day orbit
N. L. Eisner, O. Barragán, S. Aigrain, C. Lintott, G. Miller, N. Zicher, T. S. Boyajian, C. Briceño, E. M. Bryant, J. L. Christiansen, A. D. Feinstein, L. M. Fl… 展开作者
N. L. Eisner, O. Barragán, S. Aigrain, C. Lintott, G. Miller, N. Zicher, T. S. Boyajian, C. Briceño, E. M. Bryant, J. L. Christiansen, A. D. Feinstein, L. M. Flor-Torres, M. Fridlund, D. Gandolfi, J. Gilbert, N. Guerrero, J. M. Jenkins, K. Jones, M. H. Kristiansen, A. Vanderburg, N. Law, A. R. López-Sánchez, A. W. Mann, E. J. Safron, M. E. Schwamb, K. G. Stassun, H. P. Osborn, J. Wang, A. Zic, C. Ziegler, F. Barnet, S. J. Bean, D. M. Bundy, Z. Chetnik, J. L. Dawson, J. Garstone, A. G. Stenner, M. Huten, S. Larish, L. D. Melanson, T. Mitchell, C. Moore, K. Peltsch, D. J. Rogers, C. Schuster, D. S. Smith, D. J. Simister, C. Tanner, I. Terentev, A. Tsymbal
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Accepted for publication in MNRAS (16 pages, 10 figures, 3 tables)
We report on the discovery and validation of TOI 813b (TIC 55525572 b), a transiting exoplanet identified by citizen scientists in data from NASA's Transiting Exoplanet Survey Satellite (TESS) and the first planet discovered by the Planet Hunters TESS project. The host star is a bright (V = 10.3 mag) subgiant ($R_\star=1.94\,R_\odot$, $M_\star=1.32\,M_\odot$). It was observed almost continuously by TESS during its first year of operations, during which time four individual transit events were detected. The candidate passed all the standard light curve-based vetting checks, and ground-based follow-up spectroscopy and speckle imaging enabled us to place an upper limit of $2 M_{Jup}$ (99 % confidence) on the mass of the companion, and to statistically validate its planetary nature. Detailed modelling of the transits yields a period of $83.8911_{ - 0.0031 } ^ { + 0.0027 }$ days, a planet radius of $6.71 \pm 0.38$ $R_{\oplus}$, and a semi major axis of $0.423_{ - 0.037 } ^ { + 0.031 }$ AU. The planet's orbital period combined with the evolved nature of the host star places this object in a relatively under-explored region of parameter space. We estimate that TOI-813b induces a reflex motion in its host star with a semi-amplitude of $\sim6$ ms$^{-1}$, making this system a promising target to measure the mass of a relatively long-period transiting planet.
The Hot Neptune Initiative (HONEI) III. An ultra-hot super Neptune orbiting the metal-rich subgiant star TOI-5646: the largest host for a desert dweller
University of Rome “Tor Vergata”（罗马第二大学）；INAF – Turin Astrophysical Observatory（意大利国家天体物理研究所都灵天文台）；Space Research Institute, Austrian Academy of Sciences（奥地利科学院空间研究所）；University of Bern（伯尔尼大学）；Leiden University（莱顿大学）；INAF – Astronomical Observatory of Rome（意大利国家天体物理研究所罗马天文台）
Lithium Enrichment in a Subgiant Star with a Brown Dwarf Companion: A Planetary Engulfment Candidate
University of Michigan（密歇根大学）；University of Wisconsin–Madison（威斯康星大学麦迪逊分校）；Massachusetts Institute of Technology（麻省理工学院）；University of California, Santa Cruz（加州大学圣克鲁兹分校）；Texas Advanced Computing Center, University of Texas, Austin（德克萨斯大学奥斯汀分校高级计算中心）；University of Wisconsin-Whitewater（威斯康星大学惠特沃分校）
TOI-2155 b: A Massive Brown Dwarf or a Very Low-Mass Star?
Sydney Institute for Astronomy, School of Physics, University of Sydney（悉尼大学物理学院天体物理学研究所）；Department of Physics and McDonnell Center for the Space Sciences, Washington University（华盛顿大学物理系与麦克唐纳太空科学中心）；Institute for Astronomy, University of Hawaii at Manoa（夏威夷大学马诺阿分校天文研究所）；School of Physics and Astronomy, University of Leicester（莱斯特大学物理与天文学学院）；Macquarie University Research Fellow (MQRF)（麦考瑞大学研究研究员（MQRF））；Australian Astronomical Optics, Macquarie University（麦考瑞大学澳大利亚天文光学）；Astrophysics and Space Technologies Research Centre, Macquarie University（麦考瑞大学天体物理学与空间技术中心）
TOI-6692b: An eccentric 130 day period giant planet with a single transit from TESS
Center for Astrophysics | Harvard & Smithsonian（天体物理中心 | 哈佛-史密森尼）；University of Southern Queensland, Centre for Astrophysics（昆士兰大学南方分校，天体物理中心）；Department of Astronomy and Astrophysics, University of California, Santa Cruz（加州大学圣克鲁兹分校天文与天体物理学系）；Amateur Astronomer（业余天文学家）；Brorfelde Observatory（布罗费尔德天文台）；Citizen scientist, c/o Zooniverse, Department of Physics, University of Oxford（公民科学家，通过Zooniverse，牛津大学物理系）
HD 715 b, a Warm Jupiter Orbiting a Massive Subgiant Discovered from a Single TESS Transit
Max Planck Institute for Astronomy（马克斯·普朗克天文学研究所）；Centre for Astrophysics, University of Southern Queensland（南昆士兰大学天体物理中心）；Center for Astrophysics, Harvard & Smithsonian（哈佛-史密森尼天体物理中心）；Department of Astronomy & Astrophysics, University of Chicago（芝加哥大学天文与天体物理系）
