Hot planets around cool stars -- two short-period mini-Neptunes transiting the late K-dwarf TOI-1260
I. Y. Georgieva, C. M. Persson, O. Barragán, G. Nowak, M. Fridlund, D. Locci, E. Palle, R. Luque, I. Carleo, D. Gandolfi, S. R. Kane, J. Korth, K. G. Stassun, J… 展开作者
I. Y. Georgieva, C. M. Persson, O. Barragán, G. Nowak, M. Fridlund, D. Locci, E. Palle, R. Luque, I. Carleo, D. Gandolfi, S. R. Kane, J. Korth, K. G. Stassun, J. Livingston, E. C. Matthews, K. A. Collins, S. B. Howell, L. M. Serrano, S. Albrecht, A. Bieryla, C. E. Brasseur, D. Ciardi, W. D. Cochran, K. D. Colon, I. J. M. Crossfield, Sz. Csizmadia, H. J. Deeg, M. Esposito, E. Furlan, T. Gan, E. Goffo, E. Gonzales, S. Grziwa, E. . W. Guenther, P. Guerra, T. Hirano, J. M. Jenkins, E. L. N. Jensen, P. Kabáth, E. Knudstrup, K. W. F. Lam, D. W. Latham, A. M. Levine, R. A. Matson, S. McDermott, H. L. M. Osborne, M. Paegert, S. N . Quinn, S. Redfield, G. R. Ricker, J. E. Schlieder, N. J. Scott, S. Seager, A. M. S. Smith, P. Tenenbaum, J. D. Twicken, R. Vanderspek, V. Van Eylen, J. N. Winn
We present the discovery and characterization of two sub-Neptunes in close orbits, as well as a tentative outer planet of a similar size, orbiting TOI-1260 - a low metallicity K6V dwarf star. Photometry from TESS yields radii of $R_{\rm b} = 2.33 \pm 0.10$ $R_{\oplus}$ and $R_{\rm c} = 2.82 \pm 0.15$ $R_{\oplus}$, and periods of 3.13 and 7.49 days for TOI-1260b and TOI-1260c, respectively. We combined the TESS data with a series of ground-based follow-up observations to characterize the planetary system. From HARPS-N high-precision radial velocities we obtain $M_{\rm b} = 8.61_{ - 1.46 } ^ { + 1.36 }$ $M_{\oplus}$ and $M_{\rm c} = 11.84_{ - 3.23 } ^ { + 3.38 }$ $M_{\oplus}$. The star is moderately active with a complex activity pattern, which necessitated the use of Gaussian process regression for both the light curve detrending and the radial velocity modelling, in the latter case guided by suitable activity indicators. We successfully disentangle the stellar-induced signal from the planetary signals, underlining the importance and usefulness of the Gaussian Process approach. We test the system's stability against atmospheric photoevaporation and find that the TOI-1260 planets are classic examples of the structure and composition ambiguity typical for the $2-3$ $R_{\oplus}$ range.
Sibling Sub-Neptunes Around Sibling M Dwarfs: TOI-521 and TOI-912
Instituto de Astrofísica de Canarias (IAC)(加那利群岛天体物理研究所);Universidad de La Laguna (ULL)(拉古纳大学);Instituto de Astrofísica de Andalucía (IAA-CSIC)(安达卢西亚天体物理研究所);Hitotsubashi University(一桥大学);Institut d’Estudis Espacials de Catalunya (IEEC)(加泰罗尼亚空间研究所);Institut de Ciències de l’Espai (ICE, CSIC)(空间科学研究所);Centro de Astrobiología (CSIC-INTA)(天体生物学中心);Univ. Grenoble Alpes(格勒诺布尔阿尔卑斯大学);Institute of Astronomy, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicu(尼古拉·哥白尼大学天文系,物理、天文与信息学院)
TOI-3862 b: A dense super-Neptune deep in the hot Neptune desert
INAF – Osservatorio Astrofisico di Torino(意大利国家天体物理研究所都灵天文台);Instituto de Astrofísica de Canarias (IAC)(加那利群岛天体物理研究所);Astronomical Observatory, University of Geneva(日内瓦大学天文台);Departamento de Astrofísica, Universidad de La Laguna (ULL)(拉帕尔马大学天体物理学系);Institute of Astronomy, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University(尼古拉斯·哥白尼大学物理、天文和信息学院天文学研究所)
Spin-Orbit Alignment of Two Neptune-size Planets Younger than 500 Myr: TOI-560 b and TOI-5082 b
Institute for Astronomy, University of Hawaii(夏威夷大学天文研究所);Department of Astronomy, California Institute of Technology(加州理工学院天文学系);Jet Propulsion Laboratory, California Institute of Technology(加州理工学院喷气推进实验室);Department of Astronomy, University of California Berkeley(加州大学伯克利分校天文学系);Center for Computational Astrophysics, Flatiron Institute(西蒙斯基金会平顿研究所计算天体物理中心);Korea Astronomy and Space Science Institute(韩国天文与空间科学研究院);National Astronomical Observatories, Chinese Academy of Sciences(中国科学院国家天文台);Department of Astronomy, Indiana University(印第安纳大学天文学系)
Transmission Spectrum of the Benchmark Temperate Exo-Neptune TOI-1231 b
School of Physics and Astronomy, Cardiff University(卡迪夫大学物理与天文学学院);Institute of Astronomy, University of Cambridge(剑桥大学天文研究所);Space Telescope Science Institute(太空望远镜科学研究所);Space Science Institute(空间科学研究所)
JWST NIRSpec G395H Transmission Spectra of Two Similar Sub-Neptunes in the TOI-125 System
Johns Hopkins University(约翰斯·霍普金斯大学);Space Telescope Science Institute(太空望远镜科学研究所);University of Oxford(牛津大学);Cavendish Laboratory, JJ Thomson Avenue, Cambridge CB3 0HE, UK(剑桥大学卡文迪许实验室);University of California San Diego(加利福尼亚大学圣地亚哥分校)
Densities of small planets around the M dwarfs TOI-4336 A and TOI-4342 with ESPRESSO: Three sub-Neptunes, one super-Earth, and a Neptune-mass candidate
Observatoire de Genève, Département d’Astronomie, Université de Genève(日内瓦天文台,天文学系,日内瓦大学);Institut Trottier de recherche sur les exoplanètes, Département de Physique, Université de Montréal(特罗蒂埃系外行星研究所,物理系,蒙特利尔大学);Institute for Particle Physics and Astrophysics, ETH Zürich(粒子物理学与天体物理学研究所,苏黎世联邦理工学院);Centro de Astrobiología (CAB), CSIC-INTA(天体生物学中心(CAB),西班牙国家研究委员会-国家航空航天技术研究所);Instituto de Astrofísica e Ciências do Espaço, Universidade do Porto, CAUP(天体物理学与空间科学研究所,波尔图大学,CAUP);Departamento de Matemática y Física Aplicadas, Universidad Católica de la Santísima Concepción(应用数学与物理系,天主教神圣启示大学);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);Department of Physics and Astronomy, McMaster University(物理与天文学系,麦克马斯特大学);Center for Astrophysics | Harvard & Smithsonian(天体物理中心,哈佛大学与史密森尼学会)
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)
A Pair of Dynamically Interacting Sub-Neptunes Around TOI-6054
University of Wisconsin–Madison(威斯康星大学麦迪逊分校);University of Kansas(堪萨斯大学);Max-Planck-Institut für Astronomie(马克斯·普朗克天文学研究所);Jet Propulsion Laboratory, California Institute of Technology(加州理工学院喷气推进实验室);University of California, Irvine(加州大学尔湾分校);Center for Astrophysics | Harvard & Smithsonian(哈佛与史密森尼天体物理中心);NASA Exoplanet Science Institute-Caltech/IPAC(NASA系外行星科学研究所-加州理工/IPAC);Sternberg Astronomical Institute, Lomonosov Moscow State University(莫斯科国立大学斯捷克列夫天文研究所);NASA Ames Research Center(NASA艾姆斯研究中心);Bay Area Environmental Research Institute(湾区环境研究所)
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)
The GAPS Programme at TNG. LXXIII. Confirmation of the hot sub-Neptune TOI-4602 b (HD 25295 b), a key target for future atmospheric characterization
INAF – Osservatorio Astronomico di Palermo(意大利国家天体物理研究所巴勒莫天文台);ESO - European Southern Observatory(欧洲南方天文台);INAF-Osservatorio Astronomico di Roma(意大利国家天体物理研究所罗马天文台);INAF – Osservatorio Astrofisico di Catania(意大利国家天体物理研究所卡塔尼亚天文台);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 Research Institute, Austrian Academy of Sciences(奥地利科学院空间研究所)
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)
Magma ocean interactions can explain JWST observations of the sub-Neptune TOI-270 d
School of Earth and Space Exploration, Arizona State University(亚利桑那州立大学地球与空间探索学院);Department of Astronomy, University of Maryland(马里兰大学天文学系);Space Telescope Science Institute(太空望远镜科学研究所);Department of Astronomy & Astrophysics, University of Chicago(芝加哥大学天文学与天体物理学系);Kapteyn Astronomical Institute, University of Groningen(格罗宁根大学卡普坦天文研究所);Earth and Planets Laboratory, Carnegie Institution for Science(卡内基科学学会地球与行星实验室)