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HD 12098: a highly distorted dipole mode in an obliquely pulsating roAp star
Saio, H.; Kurtz, D. W.; Joshi, Santosh +2 more
HD 12098 is a rapidly oscillating Ap star pulsating in the most distorted dipole mode yet observed in this class of star. Using Transiting Exoplanet Survey Satellite (TESS) Sector 58 observations, we show that there are photometric spots at both the magnetic poles of this star. It pulsates obliquely primarily in a strongly distorted dipole mode wi…
Very metal-poor stars I: a catalogue derived from LAMOST DR9
Zhao, Gang; Li, Haining; Hou, Xiaokun
In this paper, a semisupervised machining learning technique had been utilized to analyse low-resolution stellar spectra from Large sky Area Multi-Object fiber Spectroscopic Telescope (LAMOST) Data Release 9 (DR9). We identified approximately 111 000 potential very metal-poor stars. Estimation of their stellar parameters ($T_{\rm eff}$, ${\rm log}…
The outflowing ionised gas of I Zw 1 observed by HST COS
Brandt, W. N.; Kriss, G. A.; Costantini, E. +8 more
Aims: We present an analysis of the Hubble Space Telescope Cosmic Origins Spectrograph spectrum of I Zw 1 aiming to probe the absorbing medium associated with the active galactic nucleus (AGN).
Methods: We fitted the emission spectrum and performed spectral analysis of the identified absorption features to derive the corresponding ionic …
Dark matter in the Milky Way: Measurements up to 3 kpc from the Galactic plane above the Sun
Reylé, C.; Robin, A. C.; Bienaymé, O. +1 more
We probe the gravitational force perpendicular to the Galactic plane at the position of the Sun based on a sample of red giants, with measurements taken from the DR3 Gaia catalogue. Measurements far out of the Galactic plane up to 3.5 kpc allow us to determine directly the total mass density, where dark matter is dominant and the stellar and gas d…
Understanding the Dust Environment at Mercury: From Surface to Exosphere
Krüger, Harald; Kobayashi, Masanori; Murakami, Go +13 more
We provide an overview of our understanding of the dust environment at Mercury and the role that dust plays in shaping the planet's surface and exosphere. Our understanding of the role that dust impacts play in the generation of Mercury's atmosphere has evolved considerably with continued analysis of results from the MErcury Surface, Space ENviron…
Cosmological Constraints on Neutrino Masses in Light of JWST Red and Massive Candidate Galaxies
Su, Yan; Huang, Zhi-Qi; Liu, Jian-Qi
The overabundance of the red and massive candidate galaxies observed by the James Webb Space Telescope (JWST) implies efficient structure formation or large star formation efficiency at high redshift z ∼ 10. In the scenario of a low or moderate star formation efficiency, because massive neutrinos tend to suppress the growth of structure of the uni…
Gas metallicity of ram-pressure-stripped galaxies at intermediate redshifts with MUSE data
Werle, A.; Poggianti, B.; Gullieuszik, M. +5 more
Extraplanar tails of ionized-stripped gas, extending up to several tens of kiloparsecs beyond the stellar disk, are often observed in ram-pressure-stripped (RPS) galaxies in low-redshift clusters. Recent studies have also identified similar tails at high redshifts, and we present here the first analysis of the chemical composition of such tails be…
Atmospheric gravity waves in Venus dayside clouds from VIRTIS-M images
Cardesín-Moinelo, Alejandro; Hueso, Ricardo; Peralta, Javier +3 more
We perform a survey of the Visible and Infrared Thermal Imaging Spectrometer-Mapper (VIRTIS-M) images onboard the Venus Express space mission, at four narrow wavelength bands that target different altitude regions on the cloud deck of Venus' atmosphere (280–320, 365–400, 580–600, 900–920 nm). Our goal was to detect and characterize atmospheric gra…
Detection of gravitational waves in circular particle accelerators II. Response analysis and parameter estimation using synthetic data
Brüggen, Marcus; Rao, Suvrat; Baumgarten, Julia +1 more
We simulate the response of a Storage Ring Gravitational Wave Observatory (SRGO) to astrophysical millihertz (mHz) gravitational waves (GWs), numerically obtaining its sensitivity curve and optimal choices for some controllable experiment parameters. We also generate synthetic noisy GW data and use Markov Chain Monte Carlo methods to perform param…
Parallel Electron Beams at Io: Numerical Simulations of the Dense Plasma Wake
Bagenal, F.; Dols, V.; Paterson, W. R.
In 1995, the Galileo spacecraft traversed the wake of Io at ∼900 km altitude. The instruments onboard detected intense bi-directional field-aligned electron beams (∼140 eV-150 keV), embedded in a dense, cold and slow plasma wake (Nel ∼ 35,000 cm−3, Ti < 10 eV, V < 3 km/s). Similar electron beams were also det…