Samaporn Tinyanont

An Archival Optical Counterpart Search for Extragalactic Fast X-Ray Transients Discovered by Einstein Probe

Runduo Liang, Wenxiong Li, Liang-Duan Liu, K. Smith et autres

Abstract Extragalactic fast X-ray transients (eFXTs) represent a rapidly growing class of high-energy phenomena, whose physical origins remain poorly understood. With its wide-field, sensitive all-sky monitoring, the Einstein Probe (EP) has greatly increased the discovery rate of eFXTs. The search for and …

cn, gb, de, cl, us, tw, nl, th (code pays fourni par la source)

AT 2024wpp: the most luminous fast-evolving optical transient linked to the merger explosion of a black-hole binary

Jialian Liu, Bao Wang, Xiaofeng Wang, David Aguado et autres

Fast blue optical transients (FBOTs) represent one of the most exotic astrophysical transients, exhibiting unusually strong emission across X-ray, optical, and radio wavelengths. Their physical origins remain highly debated, with proposed explanations ranging from stellar explosion to tidal disruption event (TDE). Here …

AT 2024wpp: the most luminous fast-evolving optical transient linked to the merger explosion of a black-hole binary

Jialian Liu, Bao Wang, Xiaofeng Wang, David Aguado et autres

Fast blue optical transients (FBOTs) represent one of the most exotic astrophysical transients, exhibiting unusually strong emission across X-ray, optical, and radio wavelengths. Their physical origins remain highly debated, with proposed explanations ranging from stellar explosion to tidal disruption event (TDE). Here …

Dual Nature of M Dwarf Star: Auroral Activity Meets Solar-like Bursts

Xiaofeng Wang, Qichun Liu, Jie Lin, Y. Wang et autres

cn, au, us, th, gb, ro, ca (code pays fourni par la source)

An Archival Optical Counterpart Search for Extragalactic Fast X-Ray Transients Discovered by Einstein Probe

Runduo Liang, Wen-Xiong Li, Liang-Duan Liu, Ken Smith et autres

Extragalactic fast X-ray transients (eFXTs) represent a rapidly growing class of high-energy phenomena, whose physical origins remain poorly understood. With its wide-field, sensitive all-sky monitoring, the Einstein Probe (EP) has greatly increased the discovery rate of eFXTs. The search and identification of …

SN 2024aecx: A Fast-evolving Type IIb Supernova with a Prominent Shock-cooling Peak

Qiang Xi, Ning-Chen Sun, David Aguado, Ismael Pérez-Fournon et autres

Abstract SN 2024aecx is a nearby (∼11 Mpc) Type IIb SN discovered within ∼1 day after explosion. In this paper we report high-cadence photometric (typically 0.5 ∼ 1 day) and spectroscopic follow-up observations, conducted from as early as 0.27 day post discovery …

SN 2024abfl: A Low-Luminosity Type IIP Supernova in NGC 2146 from a Low-Mass Red Supergiant Progenitor

Xiaohan Chen, Ning-Chen Sun, Qiang Xi, Chun Chen et autres

Type IIP supernovae (SNe IIP) exhibit a significant diversity in their explosion properties, yet the physical mechanisms driving this diversity remain unknown. In this work, we present photometric and spectroscopic observations of SN 2024abfl, a SN IIP in NGC 2146 with a …

cn, th, es, gb, cl (code pays fourni par la source)

An infrared echo from a circumstellar disk in the hydrogen- and helium-poor SN 2024aecx

Samaporn Tinyanont, Kittipong Wangnok, Jennifer E. Andrews, Ryan J. Foley et autres

We present near-infrared (NIR) spectroscopy of the hydrogen- and helium-poor (Type Ic) supernova (SN) 2024aecx, which displays a strong NIR excess emerging 32 days post peak. SN 2024aecx is a peculiar SN Ic that exhibited luminous shock-cooling emission at early times, suggestive …

A multiwavelength view of the nearby Calcium-Strong Transient SN 2025coe in the X-Ray, Near-Infrared, and Radio Wavebands

Sahana Kumar, Raphael Baer-Way, Aravind P. Ravi, Maryam Modjaz et autres

Calcium-strong transients (CaSTs) are a subclass of faint and rapidly evolving supernovae (SNe) that exhibit strong calcium features and notably weak oxygen features. The small but growing population of CaSTs exhibits some aspects similar to thermonuclear supernovae but others similar to massive …

SN 2025coe: A Multiple-peaked Calcium-strong Transient from a White-dwarf Progenitor

Chun Chen, Ning-chen Sun, Qiang Xi, Samaporn Tinyanont et autres

Abstract SN 2025coe is a calcium-strong transient located at an extremely large projected offset ∼39.3 kpc from the center of its host, the nearby early-type galaxy NGC 3277 at a distance of ∼25.5 Mpc. In this paper, we present multiband photometric and …

The Most Luminous Known Fast Blue Optical Transient AT 2024wpp: Unprecedented Evolution and Properties in the Ultraviolet to the Near-infrared

Natalie LeBaron, Raffaella Margutti, Ryan Chornock, Nayana A. J. et autres

Abstract We present an extensive photometric and spectroscopic ultraviolet–optical–infrared campaign on the luminous fast blue optical transient (LFBOT) AT 2024wpp over the first ∼100 days. AT 2024wpp is the most luminous LFBOT discovered to date, with L pk ≈ (2–4) × 10 …

IGR J17091−3624: Newly Formed Periodic Dips and Multiwavelength Activity during the 2025 Outburst

Zikun Lin, Yanan Wang, Shuyuan Wei, Yongkang Sun et autres

Abstract The black hole low-mass X-ray binary (LMXB) candidate IGR J17091–3624 experienced a hard-state-only outburst in 2025. In this paper, we show that IXPE detected a series of intermittent X-ray dips, spanning a total interval of ∼1 day. Subsequent observations with NICER, …