Search Publications
The Formation Process of the First Halo Coronal Mass Ejection in Solar Cycle 25: Magnetic Cancellation, Bidirectional Jet, and Hot Channel
Xue, Zhike; Yan, Xiaoli; Wang, Jincheng +3 more
To better understand the trigger mechanism of a coronal mass ejection (CME), we present the evolution of a CME source region (active region NOAA 12790) and the formation of a hot channel before the occurrence of the first halo CME in solar cycle 25. Through analyzing the evolution of Solar Dynamics Observatory/Helioseismic and Magnetic Imager line…
The Gaia spectrophotometric standard stars survey - IV. Results of the absolute photometry campaign
Jordi, C.; Monguió, M.; Rainer, M. +18 more
We present Johnson-Kron-Cousins BVRI photometry of 228 candidate spectrophotometric standard stars for the external (absolute) flux calibration of Gaia data. The data were gathered as part of a 10-yr observing campaign with the goal of building the external grid of flux standards for Gaia and we obtained absolute photometry, relative photometry fo…
RX J0529.8-6556: a BeXRB pulsar with an evolving optical period and out of phase X-ray outbursts
Haberl, F.; Udalski, A.; Ray, P. S. +12 more
We report the results of eROSITA and NICER observations of the 2020 June outburst of the Be/X-ray binary pulsar RX J0529.8-6556 in the Large Magellanic Cloud, along with the analysis of archival X-ray and optical data from this source. We find two anomalous features in the system's behaviour. First, the pulse profile observed by NICER during maxim…
Longitudinally Resolved Spectral Retrieval (ReSpect) of WASP-43b
Gonzales, Eileen C.; Cubillos, Patricio E.; Cowan, Nicolas B. +6 more
Thermal phase variations of short-period planets indicate that they are not spherical cows: day-to-night temperature contrasts range from hundreds to thousands of degrees, rivaling their vertical temperature contrasts. Nonetheless, the emergent spectra of short-period planets have typically been fit using one-dimensional (1D) spectral retrieval co…
Synthetic Absorption Lines from Simulations of Multiphase Gas in Galactic Winds
Ostriker, Eve C.; de la Cruz, Lita M.; Schneider, Evan E.
Supernova-driven galactic winds are multiphase streams of gas that are often observed flowing at a range of velocities out of star-forming regions in galaxies. In this study, we use high-resolution 3D simulations of multiphase galactic winds modeled with the hydrodynamics code Cholla to investigate the connection between numerical studies and obse…
Late-time Hubble Space Telescope Observations of a Hydrogen-poor Superluminous Supernova Reveal the Power-law Decline of a Magnetar Central Engine
Berger, Edo; Chornock, Ryan; Nicholl, Matt +3 more
The light-curve diversity of hydrogen-poor superluminous supernovae (SLSNe) has kept open the possibility that multiple power sources account for the population. Specifically, pair-instability explosions (PISNe), which produce large masses of 56Ni, have been argued as the origin of some slowly-evolving SLSNe. Here we present detailed ob…
The climatology of carbon monoxide on Mars as observed by NOMAD nadir-geometry observations
Vandaele, Ann Carine; Liuzzi, Giuliano; Daerden, Frank +10 more
More than a full Martian year of observations have now been made by the Nadir Occultation for MArs Discovery (NOMAD) instrument suite on-board the ExoMars Trace Gas Orbiter. Radiative transfer modeling of NOMAD observations taken in the nadir geometry enable the seasonal and global-scale variations of carbon monoxide gas in the Martian atmosphere …
Polar Vortices in Planetary Atmospheres
Teanby, Nicholas A.; Mitchell, Dann M.; Seviour, William J. M. +4 more
Among the great diversity of atmospheric circulation patterns observed throughout the solar system, polar vortices stand out as a nearly ubiquitous planetary-scale phenomenon. In recent years, there have been significant advances in the observation of planetary polar vortices, culminating in the fascinating discovery of Jupiter's polar vortex clus…
Solar Modulation of Galactic Cosmic-Ray Protons Based on a Modified Force-field Approach
Qin, Gang; Shen, Zhenning; Yang, Hao +4 more
In this work, a modified force-field approach is established to investigate the long-term solar modulation of galactic cosmic-ray (GCR) protons. In this approach, the solar modulation potential φ is assumed to be energy dependent. As φ also depends on the local interstellar spectrum (LIS), a new proton LIS model is first presented based on data fr…
Propagation of Ultralow Frequency Waves from the Ion Foreshock into the Magnetosphere During the Passage of a Magnetic Cloud
Pfau-Kempf, Yann; Ganse, Urs; Battarbee, Markus +12 more
We have examined the properties of ultralow frequency (ULF) waves in space (the ion foreshock, magnetosheath, and magnetosphere) and at dayside magnetometer stations (L = 1.6-6.5) during Earth's encounter with a magnetic cloud in the solar wind, which is characterized by magnetic fields with large magnitudes (∼14 nT) and small cone angles (∼30°). …