5 papers
Exploring Hierarchical Merger Scenarios for GW241011 and GW241110
Lei He, Liang-Gui Zhu, Zheng-Yan Liu +4
GW241011 and GW241110 are asymmetric binary black hole mergers with rapidly spinning primaries, unequal component masses, and nonzero spin--orbit tilts, making them natural candida…
Searching for Electromagnetic Counterpart Candidates to GW231123
Lei He, Liang-Gui Zhu, Zheng-Yan Liu +14
The detection of GW231123, a gravitational-wave (GW) event with exceptionally massive and rapidly spinning black holes, suggests the possible formation within an active galactic nu…
Why Do Stars Turn Red? II. Steady-State Envelope Solutions
Po-Sheng Ou, Ke-Jung Chen
The physical origin of red giants (RGs) and red supergiants (RSGs) remains a fundamental question in stellar astrophysics. In Paper II of this series, we investigate the physical m…
Why Do Stars Turn Red? I. Post-Main-Sequence Expansion Mechanism
Po-Sheng Ou, Ke-Jung Chen
In this series of papers, we address the long-standing question of why post-main-sequence stars expand into red giants (RGs) or red supergiants (RSGs). This paper aims to identify…
Multi-wavelength Signatures of Supernova Shock Breakout from Red Supergiants in Two Dimensions
Wun-Yi Chen, Ke-Jung Chen, Keiichi Maeda +3
We present new two-dimensional radiation hydrodynamic simulations of supernova shock breakout from red supergiants using the code. Our progenitors are 20 and 25 M…