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A Long-period Pre-ELM System Discovered from the LAMOST Medium-resolution Survey
Liu, Jifeng; Bai, Yu; Gu, Wei-Min +16 more
We present LAMOST J041920.07+072545.4 (hereafter J0419), a close binary consisting of a bloated, extremely low mass pre-white dwarf (pre-ELM WD) and a compact object with an orbital period of 0.607189 days. The large-amplitude ellipsoidal variations and the evident Balmer and He I emission lines suggest a filled Roche lobe and ongoing mass transfe…
Evolution of Plasma Composition in an Eruptive Flux Rope
Long, D. M.; van Driel-Gesztelyi, L.; Démoulin, P. +8 more
Magnetic flux ropes are bundles of twisted magnetic field enveloping a central axis. They harbor free magnetic energy and can be progenitors of coronal mass ejections (CMEs). However, identifying flux ropes on the Sun can be challenging. One of the key coronal observables that has been shown to indicate the presence of a flux rope is a peculiar br…
Discrete Aurora on the Nightside of Mars: Occurrence Location and Probability
Luhmann, Janet; Fang, Xiaohua; Jakosky, Bruce +7 more
This paper represents the first attempt to predict the occurrence location and probability of discrete electron aurora on the nightside of Mars. We run a 3-D time-dependent magnetohydrodynamic model to characterize the spatial and temporal dynamics of magnetic field and plasma distributions over the course of one planetary rotation. We perform eig…
Decadal and Annual Variations in Meteoric Flux From Ulysses, Wind, and SOFIE Observations
Malaspina, David; Hunziker, Silvan; Sterken, Veerle +3 more
Our solar system is filled with meteoric particles, or cosmic dust, which is either interplanetary or interstellar in origin. Interstellar dust (ISD) enters the heliosphere due to the relative motion of the sun and the interstellar flow. Interplanetary dust (IPD) comes primarily from asteroid collisions or comet sublimation, and comprises the bulk…
Water Vapor on Mars: A Refined Climatology and Constraints on the Near-Surface Concentration Enabled by Synergistic Retrievals
Montmessin, Franck; Trokhimovskiy, Alexander; Korablev, Oleg +8 more
With the utilization of a novel synergistic approach, we constrain the vertical distribution of water vapor on Mars with measurements from nadir-pointing instruments. Water vapor column abundances were retrieved simultaneously with PFS (sensing the thermal infrared range) and SPICAM (sensing the near-infrared range) on Mars Express, yielding disti…
Deep Learning Based Solar Flare Forecasting Model. II. Influence of Image Resolution
Liu, Sixuan; Xu, Long; Zhao, Zhongrui +3 more
Due to the accumulation of solar observational data and the development of data-driven algorithms, deep learning methods are widely applied to build a solar flare forecasting model. Most of the works focus on how to design or select proper deep networks for the forecasting task. Nevertheless, the influence of image resolution on the learning based…
Polycyclic Aromatic Hydrocarbon emission model in photodissociation regions - I. Application to the 3.3, 6.2, and 11.2 µm bands
Cami, Jan; Tielens, A. G. G. M.; Peeters, Els +1 more
We present a charge distribution based model that computes the infrared spectrum of polycyclic aromatic hydrocarbon (PAH) molecules using recent measurements or quantum chemical calculations of specific PAHs. The model is applied to a sample of well-studied photodissociation regions (PDRs) with well-determined physical conditions (the radiation fi…
Seasonal Changes in the Vertical Structure of Ozone in the Martian Lower Atmosphere and Its Relationship to Water Vapor
Forget, F.; Montmessin, F.; Korablev, O. +13 more
The mid-infrared channel of the Atmospheric Chemistry Suite (ACS MIR) onboard the ExoMars Trace Gas Orbiter is capable of observing the infrared absorption of ozone (O3) in the atmosphere of Mars. During solar occulations, the 003←000 band (3,000-3,060 cm−1) is observed with spectral sampling of ∼0.045 cm−1. Around…
Super-Eddington accretion of the first Galactic ultra-luminous X-ray pulsar Swift J0243.6+6124
Zhang, Shu; Li, Xiaobo; Liu, Jiren +6 more
We present a detailed timing study of the pulse profile of Swift J0243.6+6124 with Hard X-ray Modulation Telescope (HXMT) and Fermi/GBM (Gamma-ray Burst Monitor) data during its 2017 giant outburst. The double-peak profile at luminosity above 5 × 1038 erg s-1 is found to be 0.25 phase offset from that below 1.5 × 1038
Near-infrared observations of RR Lyrae and Type II Cepheid variables in the metal-rich bulge globular cluster NGC 6441
Rejkuba, M.; Ripepi, V.; Marconi, M. +4 more
Context. NGC 6441 is a bulge globular cluster (GC) with an unusual horizontal branch morphology and a rich population of RR Lyrae (RRL) and Type II Cepheid (T2C) variables that is unexpected for its relatively high metallicity.
Aims: Our goal is to characterize the pulsation properties of the population II RRL and T2C variables in this metal-…