A5101553331- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Gamma-ray bursts and supernovae
- Astrophysics and Star Formation Studies
- Pulsars and Gravitational Waves Research
- Astrophysical Phenomena and Observations
- Astro and Planetary Science
- High-pressure geophysics and materials
- Astronomical Observations and Instrumentation
- Geophysics and Gravity Measurements
- Semantic Web and Ontologies
- Advanced Computational Techniques and Applications
- Astrophysics and Cosmic Phenomena
- Advanced Text Analysis Techniques
- Natural Language Processing Techniques
- Service-Oriented Architecture and Web Services
- Spectroscopy and Laser Applications
- Solar and Space Plasma Dynamics
- Sensor Technology and Measurement Systems
- Superconducting Materials and Applications
- Surgical Sutures and Adhesives
- X-ray Spectroscopy and Fluorescence Analysis
- Bluetooth and Wireless Communication Technologies
- Chaos control and synchronization
- Spacecraft and Cryogenic Technologies
Chinese Academy of Sciences
2015-2025
University of Chinese Academy of Sciences
2006-2025
Yunnan Observatories
2015-2025
National Astronomical Observatories
2003-2024
Wuzhou Red Cross Hospital
2024
Toronto Metropolitan University
2021
Hebei University of Technology
2013-2020
Peking University
2006-2019
University of Science and Technology of China
2019
Collaborative Innovation Center of Chemistry for Energy Materials
2019
Extremely low-mass white dwarfs (ELM WDs) are helium WDs with a mass less than $\sim$$0.3\rm\;M_\odot$. Most ELM found in double degenerates (DDs) the Survey led by Brown and Kilic. These systems supposed to be significant gravitational-wave sources mHz frequency. In this paper, we firstly analyzed observational characteristics of that there two distinct groups WD orbital period plane, indicating different formation scenarios such objects, i.e. stable Roche lobe overflow channel (RL channel)...
Abstract Binary interactions lead to the formation of intriguing objects, such as compact binaries, supernovae, gamma ray bursts, X-ray pulsars, novae, cataclysmic variables, hot subdwarf stars, barium stars and blue stragglers. To study evolution binary populations consequent these many methods have been developed over years, for which a robust approach named population synthesis (BPS) warrants special attention. This has seen widespread application in areas astrophysics, including but not...
Binary stars are as common single stars. of immense importance to astrophysicists because that they allow us determine the masses independent their distances. They cornerstone understanding stellar evolutionary theory and play an essential role in cosmic distance measurement, galactic evolution, nucleosynthesis formation important objects such cataclysmic variable stars, X-ray binaries, Type Ia supernovae, gravitational wave-producing double compact objects. In this article, we review...
Abstract Common envelope evolution (CEE) is vital for forming short-orbital-period compact binaries. It covers many objects, such as double merging binaries, Type Ia supernovae progenitors, binary pulsars, and X-ray Knowledge of the common (CE) ejection efficiency still needs to be improved, though progress has been made recently. Short-orbital-period hot subdwarf B star (sdB) plus white dwarf (WD) binaries are most straightforward samples with which constrain CEE physics. We apply known...
Abstract Linkage between core-collapse supernovae and their progenitors is not fully understood ongoing effort of searching identifying the needed. SN 2024abfl a recent Type II supernova that exploded in nearby star-bursting galaxy NGC 2146, which also host 2018zd. From archival Hubble Space Telescope data, we have found red source (m F814W ∼ 25) near location (angular distance ≤0 <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mover> <mml:mrow>...
The asymptotic response of donor stars in interacting binary systems to very rapid mass loss is characterized by adiabatic expansion throughout their interiors. In this limit, energy generation and heat flow through the stellar interior can be neglected. We model constructing sequences, beginning with a star filling its Roche lobe at an arbitrary point evolution, holding specific entropy composition profiles fixed as removed from surface. remains hydrostatic equilibrium. Luminosity these...
The single-degenerate model is currently a favorable progenitor for Type Ia supernovae (SNe Ia). Recent investigations on the white dwarf (WD) + He star channel of imply that this noteworthy producing SNe Ia. In paper, we studied SN birthrates and delay times via detailed binary population synthesis approach. We found Galactic birthrate from WD ∼0.3 × 10−3 yr−1 according to our standard model, can explain with short (∼4.5 107–1.4 108 yr). Meanwhile, these systems may be related young...
Eclipsing binary millisecond pulsars (the so-called black widows and redbacks) can provide important information about accretion history, pulsar irradiation of their companion stars the evolutionary link between accreting X-ray isolated pulsars. However, formation such systems is not well understood, nor difference in progenitor evolution two populations redbacks. Whereas both have orbital periods $0.1-1.0\;{\rm days}$ masses differ by an order magnitude. In this paper, we investigate these...
The distinguishing feature of the evolution close binary stars is role played by mass exchange between component stars. Whether transfer dynamically stable one essential questions in evolution. In limit extremely rapid transfer, response a donor star an interacting becomes asymptotically adiabatic expansion. We use loss model to systematically survey thresholds for dynamical timescale over entire span possible evolutionary states. also simulate process with isentropic envelopes, specific...
Since September 2018, LAMOST starts a new 5-year medium-resolution spectroscopic survey (MRS) using bright/gray nights. We present the scientific goals of LAMOST-MRS and propose near optimistic strategy survey. A complete footprint is also provided. Not only regular survey, but time-domain being conducted since 2018 will be end in 2023. According to detailed plan, we expect that can observe about 2 million stellar spectra with ~7500 limiting magnitude around G=15 mag. Moreover, it provide...
Close-orbit low-mass X-ray binaries (LMXBs), radio binary millisecond pulsars (BMSPs) with extremely helium WDs (ELM He~WDs) and ultra-compact (UCXBs) are all part of the same evolutionary sequence. It is therefore uttermost importance to understand how these populations evolve from one specie another. Moreover, UCXBs important gravitational wave (GW) sources can be detected by future space-borne GW observatories. However, formation link between three different neutron star (NS) not fully...
Abstract Semidetached binaries are in the stage of mass transfer and play a crucial role studying physics between interacting binaries. Large-scale time-domain surveys provide many light curves binary systems, while Gaia offers high-precision astrometric data. In this paper, we develop, validate, apply pipeline that combines Markov Chain Monte Carlo method with forward model DBSCAN clustering to search for semidetached estimate inclination, relative radius, ratio, temperature ratio each...
Long-orbital-period subdwarf B (sdB) stars with main-sequence companions are believed to be the product of stable Roche Lobe overflow (RLOF), a scenario challenged by recent observations. Here we represent results systematic study orbital-period distribution sdB binaries in this channel using detailed binary evolution calculations. We show that observed long-period can well explained scenario. Furthermore, find that, if progenitors have initial masses below helium flash mass, produced from...
Orbital decay by gravitational-wave radiation will cause some close-binary white dwarfs (WDs) to merge within a Hubble time. The results from previous hydrodynamical WD-merger simulations have been used guide calculations of the post-merger evolution carbon–oxygen + helium (CO+He) WD binaries. Our models include formation hot corona in addition Keplerian disc. We introduce 'destroyed-disc' model simulate effect direct disc ingestion into expanding envelope. These indicate significant...
Abstract Common envelope evolution (CEE) physics plays a fundamental role in the formation of binary systems, such as merging stellar gravitational wave sources, pulsar binaries, and Type Ia supernovae. A precisely constrained CEE has become more important age large surveys detectors. We use an adiabatic mass-loss model to explore how total energy donor changes function remnant mass. This provides self-consistent way calculate binding donor. For comparison, we also through integrating from...
Abstract The stability criteria of rapid mass transfer and common-envelope evolution are fundamental in binary star evolution. They determine the mass, ratio, orbital distribution many important systems, such as X-ray binaries, type Ia supernovae, merging gravitational-wave sources. We use our adiabatic mass-loss model to systematically survey intermediate-mass (IM) stars’ thresholds for dynamical timescale transfer. impact metallicity on stellar responses critical ratios is explored. Both...
Binary population synthesis shows that mass transfer from a giant star to main-sequence (MS) companion may account for some observed long-orbital period blue stragglers. However, little attention {\bf is paid this straggler formation scenario} as dynamical instability often happens when the donor star. In paper, we have studied critical ratio, $q_{\rm c}$, dynamically stable MS using detailed evolution calculations. The results show more evolved generally less Roche lobe overflow. Meanwhile,...
EL CVn-type binaries are eclipsing that contain an A- or F-type dwarf star and a very low mass (∼0.2 M⊙) helium white precursor (proto-He WD). A number of such objects have been discovered in the Wide Angle Search for Planets Kepler photometric surveys. Here, we studied formation give properties space density this population stars Galaxy. We show CVn cannot be produced by common envelope evolution as previously believed because process leads to merging components when giants low-mass cores....
Wide binaries with hot subdwarf-B (sdB) primaries and main sequence companions are thought to form only through stable Roche lobe overflow (RLOF) of the sdB progenitor near tip red giant branch (RGB). We present orbital parameters eleven new long period composite based on spectroscopic observations obtained UVES, FEROS CHIRON spectrographs. Using all wide known parameters, 23 systems, observed distribution is found match very well theoretical predictions. A second result strong correlation...
We present a new method for the detection of double-lined spectroscopic binaries (SB2) using $v\sin{i}$ values from spectral fits. The is tested on synthetic and real spectra LAMOST-MRS. It can reliably detect SB2 candidates with $v\sin{i}_1+v\sin{i}_2<300\,km\,s^{-1}$ if radial velocity separation large enough. Using this method, we 2460 candidates, 1410 which are discoveries. confirm correlation between estimated by binary model $v\sin{i}_0$ single star selected sample. Additionally, our...
Triple star systems are critical for understanding stellar dynamics and compact objects in astrophysics, yet confirmed hierarchical triples identified via spectroscopy remain limited. In this study, we 23 triple by cross-matching the Gaia DR3 non-single catalog with LAMOST DR10 spectroscopic data; 18 of them new discoveries. For two well-observed triples, performed radial velocity curve fitting light analysis to determine their orbital parameters, inner outer periods 1.26 days 656 one...
Abstract Mass ( M ) and luminosity L are fundamental parameters of stars but can only be measured indirectly. Typically, effective temperature T eff ), surface gravity <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mi>log</mml:mi> <mml:mspace width="0.33em"/> <mml:mi>g</mml:mi> </mml:math> metallicity ([M/H]) derived from stellar spectra, then , age t obtained by interpolating in the grid evolutionary models. In this paper, we use random forest combination...
Abstract The growing “Hubble tension” has prompted the need for precise measurements of cosmological distances. This paper demonstrates a purely geometric approach determining distances to extragalactic binaries through joint analysis spectroastrometry (SA), radial velocity (RV), and light-curve (LC) observations. A parameterized model binary system is outlined, simulated SA, RV, LC data are computed infer probability distribution parameters based on mock data. impacts quality distance...