A5054067688- Stellar, planetary, and galactic studies
- Astro and Planetary Science
- Astronomy and Astrophysical Research
- Gamma-ray bursts and supernovae
- Astrophysics and Star Formation Studies
- Pulsars and Gravitational Waves Research
- Astrophysical Phenomena and Observations
- High-pressure geophysics and materials
- Advanced Frequency and Time Standards
- Nuclear Physics and Applications
- Geomagnetism and Paleomagnetism Studies
- Gaussian Processes and Bayesian Inference
- Markov Chains and Monte Carlo Methods
- Astronomical Observations and Instrumentation
- Adaptive optics and wavefront sensing
- Statistical Methods and Inference
Anhui Normal University
2022-2024
Nanjing University
2015-2023
University of Nevada, Las Vegas
2018-2019
Abstract The first discovered extrasolar worlds—giant, “hot Jupiter” planets on short-period orbits—came as a surprise to solar system–centric models of planet formation, prompting the development new theories for planetary system evolution. near absence observed nearby companions hot Jupiters has been widely quoted evidence in support high-eccentricity tidal migration, framework which form further out their natal protoplanetary disks before being thrown inward with extremely high...
We present spectroscopic measurements of the Rossiter-McLaughlin effect for WASP-148b, only known hot Jupiter with a nearby warm-Jupiter companion, from WIYN/NEID and Keck/HIRES instruments. This is one first scientific results reported newly commissioned NEID spectrograph, as well second obliquity constraint system close-in after WASP-47. WASP-148b consistent being in alignment sky-projected spin axis host star, $\lambda=-8^{\circ}.2^{{+8^{\circ}.7}}_{-9^{\circ}.7}$. The low observed...
We present ten $R$-band photometric observations of eight different transits the hot Jupiter HAT-P-33b, which has been targeted by our Transiting Exoplanet Monitoring Project (TEMP). The data were obtained two telescopes at Xinglong Station National Astronomical Observatories China (NAOC) from 2013 December through 2016 January, and exhibit scatter $1.6-3.0\,\rm{mmag}$. After jointly analyzing previously published data, radial-velocity (RV) measurements, new light curves, we revisit system...
Abstract The LIGO Scientific Collaboration and Virgo (LIGO/Virgo) have recently reported in GWTC-2.1 eight additional candidate events with a probability of astrophysical origin greater than 0.5 the LIGO/Virgo’s deeper search on O3a running. In GWTC-2.1, majority effective inspiral spins ( χ eff ) show magnitudes consistent zero, while two (GW190403 - 051519 GW190805 211137) new > 0 (at 90% credibility). We note that GW190403 was = <?CDATA ${0.70}_{-0.27}^{+0.15}$?> <mml:math...
Abstract The inflated radii of hot Jupiters have been explored by various theoretical mechanisms. By connecting planetary thermal evolution models with the observed properties using hierarchical Bayesian models, a parameter called heating efficiency has introduced to describe interiors these planets. Previous studies shown that marginal distribution this heating-efficiency single-peak along equilibrium temperature ( T eq ). Since are foundation inference there must be corresponding feature...
The newly detected TRAPPIST-1 system, with seven low-mass, roughly Earth-sized planets transiting a nearby ultra-cool dwarf, is one of the most important exoplanet discoveries to date. short baseline available discovery observations, however, means that planetary masses (obtained through measurement transit timing variations system) are not yet well constrained. reported in paper were derived using combination photometric measurements obtained from ground and Spitzer spacecraft, have...
The Kepler-9 system harbors three known transiting planets. holds significant interest for several reasons. First, the outer two planets exhibit a period ratio that is close to 2:1 orbital commensurability, with attendant dynamical consequences. Second, both lie in planetary mass "desert" generally associated rapid gas agglomeration phase of core accretion process. Third, there exist attractive prospects accurately measuring sky-projected stellar spin-orbit angles as well mutual inclination...
We examine the effects that dynamical instability has on shaping orbital properties of exoplanetary systems. Using N-body simulations non-EMS (Equal Mutual Separation), multiplanet systems we find lower limit time-scale t is determined by minimal mutual separation Kmin in units Hill radius. Planetary showing generally include planet pairs with period ratio <1.33. Our final distribution all adjacent shows dip-peak structures near first-order mean motion resonances similar to those observed...
GAIA leads us to step into a new era with high astrometry precision of 10 uas. Under such precision, will play important roles in detecting and characterizing exoplanets. Specially, we can identify planet pairs mean motion resonances(MMRs) via astrometry, which constrains the formation evolution planetary systems. In accordance observations, consider two Jupiters or super-Earths systems 1:2, 2:3 3:4 MMRs. Our simulations show false alarm probabilities(FAPs) third are extremely small while...
We present eight new light curves of the transiting extra-solar planet HAT-P-25b obtained from 2013 to 2016 with three telescopes at two observatories. use curves, along recent literature material, estimate physical and orbital parameters planet. Specifically, we determine mid-transit times (T$_{C}$) update linear ephemeris, T$_{C[0]}$=2456418.80996$\pm$0.00025 [$\mathrm{BJD}_\mathrm{TDB}$] P=3.65281572$\pm$0.00000095 days. carry out a search for transit timing variations (TTVs), find no...
ABSTRACT GW190814 was reported during LIGO’s and Virgo’s third observing run with the most asymmetric component masses (an ∼23 M⊙ black hole an ∼2.6 compact object). Under assumption that this event is a binary (BBH) merger formed through isolated evolution channel, we reanalyse publicly released data of modified astrophysical priors on effective spin χeff, further explore its formation history using detailed modelling. We show likely to have been classical common envelope channel. Our...
The LIGO, Virgo, and KAGRA (LVK) collaboration has announced 90 coalescing binary black holes (BBHs) with $p_{\rm astro} > 50\%$ to date, however, the origin of their formation channels is still an open scientific question. Given various properties BBHs (BH component masses individual spins) inferred using default priors by LVK, independent groups have been trying explain different channels. Of all scenarios, chemically homogeneous evolution (CHE) channel stood out distinguishing features,...
The Chinese Small Telescope ARray (CSTAR) has observed an area around the Celestial South Pole at Dome A since 2008. About $20,000$ light curves in i band were obtained lasting from March to July, photometric precision achieves about 4 mmag = 7.5 and 20 12 within a 30 s exposure time. These are analyzed using Lomb--Scargle, Phase Dispersion Minimization, Box Least Squares methods search for periodic signals. False positives may appear as variable signature caused by contaminating stars...
ABSTRACT The predominant formation channel of hot Jupiters remains a puzzle in exoplanet science. One potential way to distinguish the different mechanisms is study characteristics close-in companions Jupiters. In this study, our main focus investigate post-disc evolution planetary systems initially composed one Jupiter and several super-Earths through numerical N-body simulations spanning period 107 yr. By tracing each system, we find that only 5.6 per cent remain stable. Dynamical...
Abstract Due to the high dimensionality or multimodality that is common in modern astronomy, sampling Bayesian posteriors can be challenging. Several publicly available codes based on different algorithms solve these complex models, but execution of code not always efficient fast enough. The article introduces a C language general-purpose code, Nii-C, implements framework automatic parallel tempering Markov Chain Monte Carlo. Automatic this context means parameters ensure an process set by...
Abstract Although the formation and properties of hot Jupiters (with orbital periods P < 10 days) have attracted a great deal attention, origins warm (10 100 are less well studied. Using transit timing analysis, we present parameters five planetary systems containing Jupiters, Kepler 30, 117, 302, 487, 418. Three them, Kepler-30 c( M p = 549.4 ± 5.6 ⊕ ), Kepler-117 702 63 302 933 527 confirmed to be real based on their mass. Insights drawn from radius–temperature relationship lead...
Abstract The formation of hot Jupiters has been a subject interest in the field exoplanet science. According to conventional scenarios, these gas giants are believed form beyond snow line and subsequently migrate inward. Although early history is not well understood, they may emerge resonant chains as result disk migration. Here we study via disruption after disappears. We perform N -body simulations on planetary systems consisting one giant several super-Earths. initial configuration...
LX Ser is a deeply eclipsing cataclysmic variable with an orbital period of $0.^d 1584325$. Sixty two new eclipse times were determined by our observations and the AAVSO International Data base. Combining all available times, we analyzed O-C behavior Ser. We found that diagram shows sinusoidal oscillation 22.8 yr amplitude 0.00035 days. Two mechanisms (i.e., Applegate mechanism light travel time effect) are applied to explain cyclic modulation. difficult in period. Therefore, change most...
The astrometry method has great advantages in searching for exoplanets the habitable zone around solar-like stars. However, presence of multiple planets may cause a problem with degeneracy when trying to compute accurate planet parameters from observation data and reduce detectability. is extremely critical, especially space mission which limited time cadence. In this series papers, we study detectability Earth-mass different types multi-planet systems, aiming find most favorable targets...
We investigate the possibility of detecting planetary or stellar companions orbiting white dwarf binaries using LISA gravitational radiation detector. Specifically, we consider acceleration barycenter binary due to third body as well effect changes in tidal field across perturber's eccentric orbit. find that movement is detectable for both and mass objects. If circumbinary planets occur with frequencies similar gas giant around isolated main sequence stars, then expect order 10 such four...
On April 25th, 2019, the LIGO-Virgo Collaboration discovered a Gravitational-wave (GW) signal from binary neutron star (BNS) merger, i.e., GW190425. Due to inferred large total mass, origin of GW190425 remains unclear. We perform detailed stellar structure and evolution calculations that take into account mass-loss, internal differential rotation, tidal interactions between He-rich NS companion. explore parameter space initial properties, including masses orbital period. find immediate...
Context. On April 25, 2019, the LIGO-Virgo Collaboration discovered a gravitational-wave (GW) signal from binary neutron star (BNS) merger, that is, GW190425. Due to inferred large total mass, origin of GW190425 remains unclear. Aims. Assuming originated standard isolated evolution channel, its immediate progenitor is considered be close system, consisting He-rich and NS just after common envelope phase. We aim study formation in solar-like environment by using detailed code MESA . Methods....
This study employs numerical simulations to explore the relationship between dynamical instability of planetary systems and uniformity masses within system, quantified by Gini index. Our findings reveal a significant correlation system stability mass uniformity. Specifically, with higher demonstrate increased stability, particularly when they are distant from first-order mean motion resonances (MMRs). In general, for non-resonant constant total mass, non-equal less stable than equal given...
Abstract This study employs numerical simulations to explore the relationship between dynamical instability of planetary systems and uniformity masses within system, quantified by Gini index. Our findings reveal a significant correlation system stability mass uniformity. Specifically, with higher demonstrate increased stability, particularly when they are distant from first-order mean motion resonances. In general, for nonresonant constant total mass, non-equal-mass less stable than equal...
Abstract Searching for exoplanets with different methods has always been the focus of astronomers over past few years. Among multiple planet detection techniques, astrometry stands out its capability to accurately determine orbital parameters exoplanets. In this study, we examine likelihood extraterrestrial intelligent civilizations detecting planets in our solar system using method. By conducting injection-recovery simulations, investigate detectability four giant under observing baselines...