A5087090121- Stellar, planetary, and galactic studies
- Astro and Planetary Science
- Astrophysics and Star Formation Studies
- Astronomy and Astrophysical Research
- High-pressure geophysics and materials
- Wind Energy Research and Development
- Astronomical Observations and Instrumentation
- Wave and Wind Energy Systems
- Space Exploration and Technology
- Geological and Geochemical Analysis
- Inertial Sensor and Navigation
- Gamma-ray bursts and supernovae
- Environmental Impact and Sustainability
- Energy, Environment, Economic Growth
- Scientific Research and Discoveries
- Ship Hydrodynamics and Maneuverability
- Geomagnetism and Paleomagnetism Studies
- Transportation Planning and Optimization
- Planetary Science and Exploration
- Microgrid Control and Optimization
- Magnetic and Electromagnetic Effects
- Aquatic and Environmental Studies
- Traffic control and management
- Railway Systems and Energy Efficiency
- Advanced Sensor and Control Systems
Shanghai University of Electric Power
2021-2025
Planetary Science Institute
2016-2024
Harvard University
2013-2024
Center for Astrophysics Harvard & Smithsonian
2014-2023
Southwest Jiaotong University
2010-2022
China University of Mining and Technology
2019
Texas A&M University
2018
Xi'an Jiaotong University
2014
Moscow Institute of Thermal Technology
2008
Beijing Institute of Technology
2005
The radii and orbital periods of 4,000+ confirmed/candidate exoplanets have been precisely measured by the Kepler mission. show a bimodal distribution, with two peaks corresponding to smaller planets (likely rocky) larger intermediate-size planets, respectively. While only masses orbiting brightest stars can be determined ground-based spectroscopic observations, these observations allow calculation their average densities placing constraints on bulk compositions internal structures. However,...
ABSTRACT Several small dense exoplanets are now known, inviting comparisons to Earth and Venus. Such require translating their masses sizes composition models of evolved multi-layer interior planets. theoretical rely on our understanding the Earth’s interior, as well independently derived equations state, but so far have not involved direct extrapolations from seismic model: Preliminary Reference Model (PREM). To facilitate more detailed compositional between Earth, we derive here a...
This paper describes a new grid for the mass-radius relation of 3-layer exoplanets within mass range 0.1 through 100 Earth Masses. The 3 layers are: Fe (epsilon iron), MgSiO3 (including both perovskite phase, post-perovskite and its dissociation at ultra-high pressures), H2O Ices Ih, III, V, VI, VII, X, superionic phase along melting curve). We discuss current state knowledge about equations (EOS) that influence these calculations improvements used in grid. For 2-layer model, we demonstrate...
Abstract We present the detection of helium in extended atmosphere sub-Saturn WASP-107b using high-resolution ( R ≈ 25,000) near-infrared spectra from Keck II/Near Infrared Echelle Spectrograph (NIRSPEC). find peak excess absorption 7.26% ± 0.24% (30 σ ) centered on He i triplet at 10833 Å. The amplitude and shape profile is excellent agreement with previous observations escaping this planet made by CARMENES Hubble Space Telescope . This suggests there no significant temporal variation...
We report the first planet discovery from two-wheeled Kepler (K2) mission: HIP 116454 b. The host star is a bright (V = 10.1, K 8.0) K1 dwarf with high proper motion and parallax-based distance of 55.2 ± 5.4 pc. Based on high-resolution optical spectroscopy, we find that metal-poor [Fe/H] =−0.16 0.08 has radius R⋆ 0.716 0.024 R☉ mass M⋆ 0.775 0.027 M☉. was observed by spacecraft during its Two-Wheeled Concept Engineering Test in 2014 February. During 9 days observations, K2 single transit...
Abstract Some seismic models derived from tomographic studies indicate elevated shear‐wave velocities (≥4.7 km/s) around 120–150 km depth in cratonic lithospheric mantle. These are higher than those of peridotites, even assuming a cold geotherm (i.e., 35 mW/m 2 surface heat flux) and accounting for compositional heterogeneity peridotite xenoliths the effects anelasticity. We reviewed various geophysical petrologic constraints on nature roots (seismic velocities, lithology/mineralogy,...
HD 179070, aka Kepler-21, is a V = 8.25 F6IV star and the brightest exoplanet host discovered by Kepler. An early detailed analysis Howell et al. (2012) of first thirteen months (Q0 - Q5) Kepler light curves revealed transits planetary companion, Kepler-21b, with radius about 1.60 +/- 0.04 R_earth an orbital period 2.7857 days. However, they could not determine mass planet from initial radial velocity observations Keck-HIRES, were only able to impose 2-sigma upper limit 10 M_earth. Here we...
Abstract We present the detection of neutral helium at 10833 Å in atmosphere WASP-52b and tentative evidence grazing WASP-177b, using high-resolution observations acquired with NIRSPEC instrument on Keck II telescope. detect excess absorption by WASP-52b’s 3.44% ± 0.31% (11 σ ), or equivalently 66 5 atmospheric scale heights. This is centered planet’s rest frame (Δ v = 0.00 1.19 km s −1 ). model escape a 1D Parker wind calculate its mass-loss rate to be ∼1.4 × 10 11 g , 0.5% mass per...
For most planets in the range of radii from 1 to 4 R$_{\oplus}$, water is a major component interior composition. At high pressure H${}_{2}$O can be solid, but for larger planets, like Neptune, temperature too this. Mass and age play role determining transition between solid fluid (and mixed) water-rich super-Earth. We use latest high-pressure ultra-high-pressure phase diagrams H${}_{2}$O, by comparing them with adiabats various planet models, evolution shown, especially state H${}_{2}$O. It...
We present the characterization of Kepler-93 exoplanetary system, based on three years photometry gathered by Kepler spacecraft. The duration and cadence observations, in tandem with brightness star, enable unusually precise constraints both planet its host. conduct an asteroseismic analysis conclude that star has average density 1.652 ± 0.006 g cm−3. Its mass 0.911 0.033 M☉ renders it one lowest-mass subjects study. An transit signature produced Kepler-93b, which appears a period 4.72673978...
Super-Earths belong to a class of planet not found in the Solar System, but which appear common Galaxy. Given that some super-Earths are rocky, while others retain substantial atmospheres, their study can provide clues as formation both rocky planets and gaseous planets, - particular they help constrain role photo-evaporation sculpting exoplanet population. GJ 9827 is system already known host 3 with orbital periods 1.2, 3.6 6.2 days. Here we use new HARPS-N radial velocity measurements,...
Abstract Recent astronomical observations obtained with the Kepler and TESS missions their related ground-based follow-ups revealed an abundance of exoplanets a size intermediate between Earth Neptune (1 R ⊕ ≤ 4 ). A low occurrence rate planets has been identified at around twice (2 × ), known as exoplanet radius gap or valley. We explore geometry this in mass–radius diagram, help Mathematica plotting tool developed capability manipulating data multidimensional parameter space, visualized...
Natural magnetic field measurement is essential for discovering fundamental physical mechanisms in space. Both the CSES mission and DEMETER satellite equipped with search coil magnetometer to observe waves. The CSES mission’s search magnetometer was developed by School of Space Sciences Department Beihang University. But the accuracy these measurements is often degraded...
Ultra-short period (USP) planets are a class of exoplanets with periods shorter than one day. The origin this sub-population is still unclear, different formation scenarios highly dependent on the composition USP planets. A better understanding will, therefore, require an increase in sample such that have accurate and precise masses radii, which also includes estimates level irradiation information about possible companions. Here we report detailed characterization planet around solar-type...
Terrestrial planets have been found orbiting Sun-like stars with extremely short periods --- some as 4 hours. These "ultra-short-period planets" or "hot Earths" are so strongly irradiated that any initial H/He atmosphere has probably lost to photoevaporation. As such, the sample of hot Earths may give us a glimpse at rocky cores often enshrouded by thick envelopes on wider-orbiting planets. However, mass and radius measurements derived from hodgepodge different modeling approaches, include...
The old G3V star Kepler-10 is known to host two transiting planets, the ultra-short-period super-Earth Kepler-10b ($P=0.837$ d; $R_{\rm p}=1.47~\rm R_\oplus$) and long-period sub-Neptune Kepler-10c ($P=45.294$ p}=2.35~\rm R_\oplus$), a non-transiting planet causing variations in transit times. Measurements of mass literature have shown disagreement, depending on radial-velocity dataset and/or modeling technique used. Here we report analysis almost 300 high-precision radial velocities...
The old G3V star Kepler-10 is known to host two transiting planets, the ultra-short-period super-Earth Kepler-10,b (P=0.837 d; rp=1.47 and long-period sub-Neptune Kepler-10,c (P=45.294 rp=2.35 a non-transiting planet that causes variations in transit times. Measurements of mass literature have shown disagreement, depending on radial-velocity dataset and/or modeling technique used. Here we report analysis almost 300 high-precision radial velocities gathered with HARPS-N spectrograph at...
M-dwarf stars are promising targets for identifying and characterizing potentially habitable planets. K2-3 is a nearby (45 pc), early-type M dwarf hosting three small transiting planets, the outermost of which orbits close to inner edge stellar (optimistic) zone. The system well suited follow-up characterization studies aimed at determining accurate masses bulk densities Using total 329 radial velocity measurements collected over 2.5 years with HARPS-N HARPS spectrographs proper treatment...
We report the discovery and characterization of transiting extrasolar planet TOI-1710$\:$b. It was first identified as a promising candidate by Transiting Exoplanet Survey Satellite (TESS). Its planetary nature then established with SOPHIE HARPS-N spectroscopic observations via radial-velocity method. The stellar parameters for host star are derived from spectra joint Markov chain Monte-Carlo (MCMC) adjustment spectral energy distribution evolutionary tracks TOI-1710. A MCMC analysis TESS...
The prospects for finding transiting exoplanets in the range of a few to 20 Earth masses is growing rapidly with both ground-based and spaced-based efforts. We describe publicly available computer code compute quantify compositional ambiguities differentiated solid measured mass radius, including radius uncertainties.
The aerodynamic performance of the floating offshore wind turbine (FOWT) is obviously affected by motion platform, and becomes much more complicated considering effect tower shadow. In view this, this paper aims at investigating with without a under three most influential motions (surge, pitch yaw) computational fluid dynamic (CFD). results show that power reduced 1.58% to 2.47% due shadow motions, pressure difference distribution interfered yaw concentrates root tip blade. addition, degree...