Peking – Kavli Institute Pre-Print Publications

S-PLUS: Beyond Spectroscopy IV. Stellar Parameters and Elemental-abundance Ratios for Six Million Stars from DR4 and First Results for the Magellanic Clouds

Posted by klaurent February 15, 2026February 18, 2026Peking, This Week: Astrophysics

Kavli Affiliate: Huawei Zhang | Summary:We combine narrow/medium-band filter photometry from the Southern Photometric Local Universe Survey (S-PLUS) DR4 with ultra broad-band filter photometry from Gaia EDR3 to derive fundamental stellar parameters ($T_rm eff$, $log g$, [Fe/H], ages) and elemental-abundance ratios ([C/Fe] and [$α$/Fe]) for 5.4 million stars in the Galaxy (4.9 million dwarfs and […]

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VENUS: Strong-lensing model of MACS J1931.8-2635 — revealing the farthest multiply imaged supernova

Posted by klaurent February 15, 2026February 18, 2026Peking, This Week: Astrophysics

Kavli Affiliate: Kohei Inayoshi | Summary:We present a parametric strong-lensing model for the galaxy cluster MACS J1931.8-2635 ($z_l = 0.35$), accompanying the detection of the spectroscopically confirmed SN Eos at $z = 5.13$ (Coulter et al. 2026). We identify 10 new multiple-image systems in recent VENUS JWST/NIRCam imaging, so that the model is constrained with […]

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Direct pathway to the Early Supermassive Black Holes: A Red Super-Eddington Quasar in a Massive Starburst Host at $z=7.2$

Posted by klaurent February 12, 2026February 18, 2026Peking, This Week: Astrophysics

Kavli Affiliate: Luis Ho | Summary:We present a panchromatic optical-mm characterization of GNz7q, a recently identified X-ray weak, rapidly growing red quasar embedded within a dusty starburst galaxy at $z=7.1899$, using the full suite of JWST/NIRCam, NIRSpec, MIRI, and archival NOEMA observations. Our deep NIRSpec/G395M spectroscopy reveals unambiguous broad Balmer emission (FWHM $=2221pm20$kms$^-1$), confirming a […]

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An Enhanced Formation Channel for Galactic Dual-Line Gravitational-Wave Sources: von Zeipel-Lidov-Kozai effect in Triples Involving Sgr A*

Posted by klaurent February 11, 2026February 18, 2026Peking, This Week: Astrophysics

Kavli Affiliate: Lijing Shao | Summary:The dense Galactic Center environment is expected to host compact binary inspirals detectable by future space-borne gravitational wave (GW) observatories (e.g., LISA, TianQin, Taiji) in the millihertz band. Aided by information from these facilities, next-generation ground-based GW detectors (e.g., Cosmic Explorer, Einstein Telescope) can potentially capture gravitational radiation in the […]

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Mass-Radius Constraints for 2S 0918-549 from an RXTE Superexpansion Burst: A Direct Cooling-Tail Analysis

Posted by klaurent February 10, 2026February 18, 2026Peking, This Week: Astrophysics

Kavli Affiliate: Renxin Xu | Summary:Thermonuclear (Type I ) X-ray bursts from accreting neutron stars offer a means to determine neutron-star (NS) mass ($M$) and radius ($R$) and thereby probe the properties of matter at supranuclear density. A subset of these events, photospheric radius-expansion (PRE) bursts, provide a particularly powerful tool to constrain the neutron-star […]

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Unraveling the mysteries of Jets in peculiar NLSy1 galaxies through multi-wavelength variability

Posted by klaurent February 9, 2026February 18, 2026Peking, This Week: Astrophysics

Kavli Affiliate: Luis Ho | Summary:Radio-quiet narrow-line Seyfert 1 galaxies (RQ-NLSy1s) are generally considered to be dominated by thermal emission from the accretion disk. However, recurring 37 GHz radio flares detected from seven RQ-NLSy1s by the Metsahovi Radio Observatory suggest that non-thermal processes may also contribute to their emission. We present a systematic optical and […]

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Modeling Tidal Disruption Events and Compact Object Plunges in Nuclear Star Clusters

Posted by klaurent February 9, 2026February 18, 2026Peking, This Week: Astrophysics

Kavli Affiliate: Rainer Spurzem | Summary:We study tidal disruption events (TDEs) and compact object inspirals in nuclear star clusters (NSCs) hosting a central supermassive black hole (SMBH), focusing on their role in SMBH growth. Using the STARDISK version of the direct N-body code NBODY6++GPU, we perform pilot simulations with two improved models: one for mass […]

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Pulsars and Millisecond Pulsars II: Deep diving into the Evolutionary Mechanisms

Posted by klaurent February 8, 2026Peking

Kavli Affiliate: Rainer Spurzem | Summary:This second paper in our series investigates the evolutionary mechanisms that shape pulsars and millisecond pulsars (MSPs) across different astrophysical environments. We focus on the physical processes that govern spin evolution, magnetic field decay, binary interactions, and recycling pathways. Using observational constraints together with theoretical models, we examine how accretion, […]

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Pulsars and Millisecond Pulsars I: Advancements, Open Questions and finding Gaps via statistical insights

Posted by klaurent February 8, 2026Peking

Kavli Affiliate: Rainer Spurzem | Summary:We present a statistical study of pulsars and millisecond pulsars (MSPs) based on multiwavelength observations in the Galactic Field and Globular Clusters. We examine their emission properties, timing behavior, and spatial distributions, and discuss how theoretical models are required to interpret these observational trends. We focus on the magnetic field […]

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ALMA 873 $μ$m Polarization Observations of the PDS~70 Disk

Posted by klaurent February 5, 2026February 18, 2026Peking

Kavli Affiliate: Ruobing Dong | Summary:At a 112.4 pc distance, the PDS70 protoplanetary disk is a rare case that has been confirmed to host two accreting planets. This makes it the most important laboratory for studying dust growth in the context of planet formation. Here we present the first deep, full polarization observations at 873 […]

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