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Coronal Propagation of Solar Protons during and after Their Stochastic Acceleration
Logachev, Yu. I.; Struminsky, A. B.; Grigorieva, I. Yu. +1 more
Solar protons in eruptive flares are stochastically accelerated in a wide spatial angle, and then they are effectively kept behind the expanding coronal mass ejection (CME) front, which can either bring protons to the magnetic-field line going to a remote observer or carry them away. We consider 13 solar proton events of cycle 24 in which protons …
X-ray non-detection of PSR J0250 + 5854
Esposito, P.; Rigoselli, M.; Stappers, B. W. +1 more
We conducted a deep XMM-Newton observing campaign on the 23.5-s radio pulsar PSR J0250 + 5854 in order to better understand the connection between long-period, radio-emitting neutron stars and their high-energy-emitting counterparts. No X-ray emission was detected resulting in an upper limit in the bolometric luminosity of PSR J0250 + 5854 of <…
A Catalog of Nearby Accelerating Star Candidates in Gaia DR3
Kenyon, Scott J.; Bromley, Benjamin C.; Whiting, Marc L. +1 more
We describe a new catalog of accelerating star candidates with Gaia G ≤ 17.5 mag and distances d ≤ 100 pc. Designated as the Gaia Nearby Accelerating Star Catalog (GNASC), it contains 29,684 members identified using a supervised machine-learning algorithm trained on the Hipparcos-Gaia Catalog of Accelerations (HGCA), Gaia Data Release 2, and Gaia …
Investigating temporal changes in Jupiter's aerosol structure with rotationally-averaged 2015-2020 HST WFC3 images
Sromovsky, Lawrence A.; Fry, Patrick M.
Annual imaging observations of Jupiter from 2015 onward by the Hubble Space Telescope (HST) Wide Field Camera 3 (WFC3) as part of the Outer Planet Atmospheres Legacy (OPAL) program (Simon et al., 2015) have provided a valuable data set from which Jupiter's temporal variability can be characterized and modeled. Spectral samples at discrete filter b…
The MUSE-Faint survey. IV. Dissecting Leo T, a gas-rich relic with recent star formation
Boogaard, Leindert A.; Brinchmann, Jarle; Weilbacher, Peter M. +6 more
Context. Leo T (MV = −8.0) is a peculiar dwarf galaxy that stands out for being both the faintest and the least massive galaxy known to contain neutral gas and to display signs of recent star formation. It is also extremely dark-matter dominated. As a result, Leo T presents an invaluable opportunity to study the processes of gas and sta…
Investigating Possible Binarity for GJ 229B
Mandell, Avi M.; McElwain, Michael W.; Howe, Alex R.
GJ 229B, the first type-T brown dwarf to be discovered, has presented a tension between comparisons with evolutionary models and the larger-than-expected mass and radius values derived from spectroscopic and astrometric observations. We examine the hypothesis that GJ 229B is actually a binary substellar object by using two grid-based fits using ev…
Second-generation protoplanetary discs around evolved binaries: a high-resolution polarimetric view with SPHERE/IRDIS
Ertel, Steve; Van Winckel, Hans; Andrych, Kateryna +3 more
Binary post-asymptotic giant branch (post-AGB) stars are products of a poorly understood binary interaction process that occurs during the AGB phase. These systems comprise a post-AGB primary star, a main-sequence secondary companion and a stable circumbinary disc. Studying the structure and properties of these circumbinary discs is crucial for ga…
Connection between Polytropic Index and Heating
McComas, D. J.; Livadiotis, G.
The paper derives the one-to-one connecting relationships between plasma heating and its polytropic index, and addresses the consequences through the transport equation of temperature. Thermodynamic polytropic processes are classified in accordance to their polytropic index, the exponent of the power-law relationship of thermal pressure expressed …
Extended radio emission in the galaxy cluster MS 0735.6+7421 detected with the Karl G. Jansky Very Large Array
Hlavacek-Larrondo, J.; van Weeren, R. J.; Haggard, D. +7 more
MS 0735.6+7421 (z = 0.216) is a massive cool core galaxy cluster hosting one of the most powerful active galactic nuclei (AGNs) outbursts known. The radio jets of the AGN have carved out an unusually large pair of X-ray cavities, each reaching a diameter of 200 kpc. This makes MS 0735.6+7421 a unique case to investigate active galactic nuclei feed…
Deep Search for Gamma-Ray Emission from the Accreting X-Ray Pulsar 1A 0535+262
Torres, D. F.; Li, J.; Ji, L. +2 more
Binary systems are a well-established subclass of gamma-ray sources. The high mass X-ray binary pulsar 1A 0535+262 has been considered to be a possible gamma-ray emitter for a long time, although former gamma-ray searches using the Fermi Large Area Telescope (LAT) and VERITAS data resulted in upper limits only. We aim at a deep search for gamma-ra…