Search Publications
White Dwarfs with Infrared Excess from LAMOST Data Release 5
Wang, Lin; Gu, Wei-Min; Wang, Junfeng +5 more
Infrared (IR) excess is an important probe for substellar companions and/or debris disks around white dwarfs (WDs). Such systems are still rare, so an in-depth understanding of their formation and long-term evolution has yet to be developed. One of the largest spectroscopic surveys, carried out by the Large Sky Area Multi-Object Fibre Spectroscopi…
ELM of ELM-WD: An Extremely-low-mass Hot Star Discovered in LAMOST Survey
Chen, Xuefei; Li, Zhenwei; Zhang, Haotong +7 more
The extremely-low-mass white dwarfs (ELM WDs) and pre-ELM WDs are helium-core white dwarfs with mass <~ 0.3M ⊙. Evolution simulations show that a lower mass limit for ELM WDs exists at ≈0.14M ⊙ and no ELM WD is proposed by observation to be less massive than that. Here we report the discovery of a binary system, LAMOST J22…
TOI-1801 b: A temperate mini-Neptune around a young M0.5 dwarf
Nagel, E.; Amado, P. J.; Caballero, J. A. +79 more
We report the discovery, mass, and radius determination of TOI-1801 b, a temperate mini-Neptune around a young M dwarf. TOI-1801 b was observed in TESS sectors 22 and 49, and the alert that this was a TESS planet candidate with a period of 21.3 days went out in April 2020. However, ground-based follow-up observations, including seeing-limited phot…
The Spectacular Tidal Tails of Globular Cluster M3 (NGC 5272)
Zhao, Gang; Zhao, Jing-Kun; Yang, Yong +2 more
We provide a detailed analysis of the tidal tails of the globular cluster M3 (NGC 5272). We first discover clear extratidal structures with a slight S shape near the cluster. This inspires us to examine the existence of its long tidal tails. We highlight potential stream stars using the proper motions (PMs) of a model stream combined with the clus…
Gaia Focused Product Release: Asteroid orbital solution. Properties and assessment
Prusti, T.; Mazeh, T.; Zucker, S. +403 more
Context. We report the exploitation of a sample of Solar System observations based on data from the third Gaia Data Release (Gaia DR3) of nearly 157 000 asteroids. It extends the epoch astrometric solution over the time coverage planned for the Gaia DR4, which is not expected before the end of 2025. This data set covers more than one full orbital …
Unbiased CLEAN for STIX in Solar Orbiter
Volpara, Anna; Massa, Paolo; Piana, Michele +3 more
CLEAN is an iterative deconvolution method for radio and hard-X-ray solar imaging. In a specific step of its pipeline, CLEAN requires the convolution between an idealized version of the instrumental point-spread function (PSF), and a map collecting point sources located at positions from where most of the flaring radiation is emitted. This step ha…
Saturn's Seismic Rotation Revisited
Fuller, Jim; Dewberry, Janosz W.; Mankovich, Christopher R.
Normal mode seismology is a promising means of measuring rotation in gas giant interiors, and ring seismology presents a singular opportunity to do so at Saturn. We calculate Saturn's normal modes of oscillation and zonal gravity field, using nonperturbative methods for normal modes in the rigidly rotating approximation, and perturbative methods f…
Simulation of CSST's astrometric capability
Liao, Shi-Long; Qi, Zhao-Xiang; Shao, Li +5 more
Introduction: The China Space Station Telescope (CSST) will enter a low Earth orbit around 2024 and operate for 10 years, with seven of those years devoted to surveying the area of the median-to-high Galactic latitude and median-to-high Ecliptic latitude of the sky. To maximize the scientific output of CSST, it is important to optimize the survey …
A SPectroscopic Survey of Biased Halos in the Reionization Era (ASPIRE): JWST Discovers an Overdensity around a Metal Absorption-selected Galaxy at z 5.5
Chevallard, Jacopo; Hennawi, Joseph F.; Fan, Xiaohui +27 more
The launch of JWST opens a new window for studying the connection between metal-line absorbers and galaxies at the end of the Epoch of Reionization. Previous studies have detected absorber-galaxy pairs in limited quantities through ground-based observations. To enhance our understanding of the relationship between absorbers and their host galaxies…
Quiet-time suprathermal ions in the inner heliosphere during the rising phase of solar cycle 25
Wimmer-Schweingruber, R. F.; Allen, R. C.; Ho, G. C. +3 more
Context. The Solar Orbiter spacecraft made its first close perihelion passes in 2022, reaching 0.32 au on 26 March and 0.29 au on 12 October. Transient activity was relatively low, making it possible to perform measurements of the quiet-time suprathermal ion pool over multi-day periods.
Aims: The inner heliosphere suprathermal ion pool is a s…