Recent wide-field surveys discovered new types of peculiar optical transients that showed diverse behaviors of the evolution of photospheric properties. We develop a general theory of homologous explosions with constant opacity, paying special attention on the evolution of the photospheric radius $R_{\rm ph}$. We find that regardless of the density distribution profile, $R_{\rm ph}$ always increases early on and decreases at late times. This result does not depend on the radiation and cooling processes inside the ejecta.The general rising/falling behavior of $R_{\rm ph}$ can be used to quickly diagnose whether the source originates from a supernova-like explosion. The shape of the $R_{\rm ph}$ evolution curve depends on the density profile, so the observations may be used to directly diagnose the density profile as well as the temperature profile of the ejecta. All the well-monitored supernovae show such a $R_{\rm ph}$ rising/falling behavior, which is consistent with our theory. The recently discovered peculiar transient AT2018cow showed a continuous decay of $R_{\rm ph}$, which is disfavored to be of a supernova-like explosion origin. Our result therefore supports the interpretation of this transient as a tidal disruption event.
Multi-dimensional NLTE radiative transfer for a double detonation Type Ia explosion model in the photospheric phase
Queen’s University Belfast（贝尔法斯特女王大学）；Trinity College Dublin, The University of Dublin（都柏林三一学院，都柏林大学）；Oregon State University（俄勒冈州立大学）；Max-Planck-Institut für Astrophysik（马克斯·普朗克天体物理研究所）；Heidelberger Institut für Theoretische Studien（海德堡理论研究所）；Zentrum für Astronomie der Universität Heidelberg, Institut für Theoretische Astrophysik（海德堡大学天文学中心，理论天体物理研究所）；Zentrum für Astronomie der Universität Heidelberg, Astronomisches Rechen-Institut（海德堡大学天文学中心，天文计算研究所）
Emission line models for the lowest mass core-collapse supernovae -- II. 3D NLTE radiative transfer modelling of a $9.0\,M_\odot$ neutrino-driven explosion
The Oskar Klein Centre, Department of Astronomy, Stockholm University（斯德哥尔摩大学）；Max Planck Institute for Astrophysics（马克斯·普朗克天体物理学研究所）
Surrogate models for type II supernovae: Probing low-energy explosions and interaction-free regimes
Yunnan Observatories, Chinese Academy of Sciences (CAS)（中国科学院云南天文台）；University of the Chinese Academy of Sciences（中国科学院大学）；Kavli Institute for Cosmology, University of Cambridge（剑桥大学卡弗里宇宙学研究所）；Institute of Astronomy, University of Cambridge（剑桥大学天文学研究所）；National Astronomical Observatory of Japan, National Institutes of Natural Sciences（日本国立天文台，国立自然科学研究院）；Graduate Institute for Advanced Studies, SOKENDAI（SOKENDAI高等研究院）；School of Physics and Astronomy, Monash University（蒙纳士大学物理与天文学院）
The Type I Superluminous Supernova Catalogue II: Spectroscopic Evolution in the Photospheric Phase, Velocity Measurements, and Constraints on Diversity
SN2023ixf: Radiative-transfer modeling of the photospheric phase evolution from the ultraviolet to the infrared
Institut d’Astrophysique de Paris, CNRS-Sorbonne Université（巴黎天体物理学研究所，法国国家科学研究中心-索邦大学）；French-Chilean Laboratory for Astronomy, IRL 3386, CNRS and Instituto de Astrofísica, Pontificia Universidad Católica de Chile（中法天文实验室，法国国家科学研究中心与智利天主教庞蒂菲亚大学天体物理研究所）；Cahill Center for Astrophysics, California Institute of Technology（加州理工学院卡希尔天体物理学中心）；Steward Observatory, University of Arizona（亚利桑那大学斯图尔德天文台）；Department of Astronomy, University of California, Berkeley（加州大学伯克利分校天文学系）；Department of Physics and Astronomy, University of California, Davis（加州大学戴维斯分校物理与天文学系）
Observational signatures of thermonuclear electron-capture supernovae -- Ne II line strengthening and color evolution as traces of the explosion mechanism
Heidelberger Institut für Theoretische Studien（海德堡理论研究所）；Queen’s University Belfast（贝尔法斯特女王大学）；Los Alamos National Laboratory（洛斯阿拉莫斯国家实验室）；Zentrum für Astronomie der Universität Heidelberg, Institut für Theoretische Astrophysik（海德堡大学天体物理中心，理论天体物理研究所）；Max-Planck-Institut für Astrophysik（马克斯·普朗克天体物理研究所）；Sapienza Università di Roma, Dipartimento di Fisica（罗马智慧大学，物理系）；Trinity College Dublin, The University of Dublin（都柏林三一学院，都柏林大学）；GSI Helmholtzzentrum für Schwerionenforschung（GSI亥姆霍兹重离子研究中心）
