我们报告了对白矮星候选体 ZTF 185139.81+171430.3 在 R 和 B 波段的相位分辨光学光谱和测光观测。该源此前被报道在 R 波段具有接近 1 星等的大振幅变光，以及 12.37 分钟的短周期。我们确认了这一周期，并将其解释为白矮星的自转周期。光学光谱显示出氢和氦的发射线叠加在无特征连续谱上。连续谱的形状在整个周期内发生变化，当源变亮时颜色变得更红。有初步证据表明发射线在自转周期内存在多普勒位移，振幅为几十 km s$^{-1}$。值得注意的是，H$α$ 和 H$β$ 线表现出不同的视向速度振幅，表明它们来自不同的发射区域。我们还基于可能的轨道边带，识别出一个候选轨道周期为 1.00 小时。这些特征——在自转频率上调制的多普勒位移、亮度变化以及连续谱形状变化——与吸积帷幔模型一致，在该模型中，物质从截断的内盘沿磁场线漏斗状流向白矮星的磁极。
英文摘要：
We report on phase-resolved optical spectroscopy and photometry in the R and B bands of the white dwarf candidate ZTF 185139.81+171430.3. The source has been reported to be variable with a large amplitude of close to 1 magnitude, in the R band, and a short period of 12.37 min. We confirm this period and interpret it as the spin period of the white dwarf. The optical spectrum shows emission lines from hydrogen and helium superposed on a featureless continuum. The continuum changes shape throughout a cycle, such that it is redder when the source is bright. There is tentative evidence for Doppler shifts in the emission lines during the spin cycle with an amplitude of a few tens of km s$^{-1}$. Notably, the H$α$ and H$β$ lines exhibit different radial velocity amplitudes, suggesting that they come from different emission regions. We also identify a candidate orbital period of 1.00 hr, based on potential orbital sidebands. These features - Doppler shifts modulated at the spin frequency, brightness variations, and continuum shape changes - are consistent with the accretion curtain model, in which material is funneled from a truncated inner disc along magnetic field lines onto the magnetic poles of the white dwarf.
University of Geneva（日内瓦大学）；University of Illinois Urbana-Champaign（伊利诺伊大学厄巴纳-香槟分校）；Villanova University（维拉诺瓦大学）；California Institute of Technology（加州理工学院）；European Space Astronomy Centre (ESA/ESAC)（欧洲空间天文中心（ESA/ESAC））；Starion for European Space Agency (ESA)（欧洲航天局星点公司（ESA））；Sednai Sarl（Sednai公司）
Circumstellar interaction in the extreme white dwarf merger remnant ZTF\,J1901+1458: A new class of white dwarf merger remnants with X-ray emission
Institute of Science and Technology Austria（奥地利科学技术学院）；Division of Physics, Mathematics and Astronomy, California Institute of Technology（加州理工学院物理、数学与天文学系）；Mathematical Sciences Institute, Australian National University（澳大利亚国立大学数学科学学院）；International Center for Radio Astronomy Research, Curtin University（珀斯曲恩大学国际射电天文研究中心）；Center for Astrophysics — Harvard & Smithsonian（哈佛-史密森尼天体物理中心）；Leibniz-Institut für Astrophysik Potsdam (AIP)（波茨坦阿基米德天体物理研究所）；Departament de Física, Universitat Politècnica de Catalunya（加泰罗尼亚理工大学物理系）
Discovery of the first outbursting hot subdwarf binary: ZTF J0007+4804
Hamburger Sternwarte, University of Hamburg（汉堡天文台，汉堡大学）；Texas Tech University（德克萨斯理工大学）；KU Leuven（荷语鲁汶大学）；Lycoming College（莱科明学院）；University of North Carolina at Chapel Hill（北卡罗来纳大学教堂山分校）；Universität Potsdam（波茨坦大学）
A Systematic Gaia--ZTF Search for Short-Period Blue Compact-Binary Candidates
School of Physics and Astronomy, Sun Yat-sen University（中山大学物理学院）；CSST Science Center for the Guangdong-Hongkong-Macau Greater Bay Area, Sun Yat-sen University（中山大学粤港澳大湾区CSST科学中心）；School of Electrical and Electronic Engineering, Anhui Science and Technology University（安徽科技学院电气与电子工程学院）；School of Science, Shenzhen Campus of Sun Yat-sen University（中山大学深圳校区理学院）
Fast-transient Searches in Real Time with ZTFReST: Identification of Three Optically-discovered Gamma-ray Burst Afterglows and New Constraints on the Kilonova Rate
A half-ring of ionized circumstellar material trapped in the magnetosphere of a white dwarf merger remnant
Institute of Science and Technology Austria（奥地利科学技术研究院）；Division of Physics, Mathematics and Astronomy, California Institute of Technology（加州理工学院物理、数学与天文系）；Center for Astrophysics — Harvard & Smithsonian（哈佛-史密森尼天体物理中心）；Mathematical Sciences Institute, The Australian National University（澳大利亚国立大学数学科学研究院）；International Center for Radio Astronomy Research, Curtin University（科廷大学国际射电天文研究中心）；Department of Physics and Astronomy, University of British Columbia（不列颠哥伦比亚大学物理与天文系）；Department of Astronomy & Institute for Astrophysical Research, Boston University（波士顿大学天文系及天体物理研究所）；TAPIR, Mailcode 350-17, California Institute of Technology（加州理工学院TAPIR）
ZTF J021804.16+071152.93: a dead cataclysmic variable and potential solution to the missing period bouncers
University of Sheffield（谢菲尔德大学）；University of Hamburg（汉堡大学）；University of Leicester（莱斯特大学）；Institute of Science and Technology Austria（奥地利科学技术研究所）；University of Amsterdam（阿姆斯特丹大学）；Universitat Politècnica de Catalunya（加泰罗尼亚理工大学）；Institut d’Estudis Espacials de Catalunya（加泰罗尼亚空间研究所）；Centro de Astrobiología (CAB), CSIC-INTA（天体生物学中心（CAB），西班牙国家航空航天技术研究所/西班牙国家科学研究委员会）；Universidad de Valparaíso（瓦尔帕莱索大学）
Circular polarimetry of suspect wind-accreting pre-polars II
Department of Physics and Astronomy, University of Sheffield（谢菲尔德大学物理与天文学系）；Armagh Observatory and Planetarium（阿马赫天文台和行星馆）；Department of Physics, University of Warwick（华威大学物理系）；Hamburger Sternwarte, University of Hamburg（汉堡天文台，汉堡大学）
Now you see me, now you don't: Deep, long-lived obscuration events of white dwarfs by dust and debris from disintegrating planetesimals
Institute of Science and Technology Austria（奥地利科学技术研究所）；Anton Pannekoek Institute for Astronomy, University of Amsterdam（阿姆斯特丹大学安顿·潘内科克天文学研究所）；Cahill Center for Astrophysics, California Institute of Technology（加州理工学院凯斯天体物理中心）；Department of Astronomy & Institute for Astrophysical Research, Boston University（波士顿大学天文系与天体物理研究所）；Center for Astrophysics, Harvard & Smithsonian（哈佛-史密森尼天体物理中心）；Instituto de Astrofisica de Canarias（加那利天体物理学研究所）；Department of Physics, University of Warwick（华威大学物理系）；Columbia University（哥伦比亚大学）
Dynamically Coupled Three-dimensional Cloud-Chemistry in Rapidly Rotating Irradiated Atmospheres: an Application to the Compact White Dwarf-Brown Dwarf system ZTFJ0038+2030
Tsung-Dao Lee Institute, Shanghai Jiao Tong University（李政道研究所，上海交通大学）；School of Physics and Astronomy, Shanghai Jiao Tong University（物理与天文学院，上海交通大学）；State Key Laboratory of Dark Matter Physics, Shanghai Jiao Tong University（暗物质物理全国重点实验室，上海交通大学）；Department of Astronomy, University of Virginia（天文学系，弗吉尼亚大学）；School of Physics and Astronomy, University of Leicester（物理与天文学院，莱斯特大学）；School of Physics and Astronomy, University of Birmingham（物理与天文学院，伯明翰大学）；Center for Space and Habitability, University of Bern（太空与宜居性中心，伯尔尼大学）；Space Telescope Science Institute（太空望远镜科学研究所）；Université de la Côte d’Azur, Observatoire de la Côte d’Azur, CNRS, Laboratoire Lagrange（蔚蓝海岸大学，蔚蓝海岸天文台，法国国家科学研究中心，拉格朗日实验室）
University of the Western Cape（西开普敦大学）；South African Astronomical Observatory（南非天文台）；Southern African Large Telescope（南非大型望远镜）；Sternberg Astronomical Institute, Lomonosov Moscow State University（莫斯科国立大学斯特恩伯格天体物理研究所）
