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A Catalogue of Forbush Decreases Recorded on the Surface of Mars from 2012 Until 2016: Comparison with Terrestrial FDs
Wimmer-Schweingruber, R. F.; Heber, B.; Herbst, K. +9 more
Forbush decreases (FDs) in galactic cosmic rays (GCRs) have been recorded by neutron monitors (NMs) at Earth for more than 60 years. For the past five years, with the establishment of the Radiation Assessment Detector (RAD) onboard the Mars Science Laboratory (MSL) rover Curiosity at Mars, it is possible to continuously detect, for the first time,…
Observations of Short-period Current Sheet Flapping Events in the Earth's Magnetotail
Deng, X. H.; Huang, S. Y.; Xu, S. B. +9 more
The flapping motion of the current sheet, with the period from several minutes to tens of minutes, is one common dynamic phenomenon in the planetary magnetotail. This Letter reports on one current sheet flapping event with the short semi-period of ∼6 s on 2017 July 17 in the Earth’s magnetotail for the first time using the Magnetospheric Multiscal…
The Effects of Crustal Magnetic Fields and Solar EUV Flux on Ionopause Formation at Mars
Gurnett, D. A.; Morgan, D. D.; Kopf, A. J. +5 more
We study the ionopause of Mars using a database of 6,893 ionopause detections obtained over 11 years by the MARSIS (Mars Advanced Radar for Subsurface and Ionosphere Sounding) experiment. The ionopause, in this work, is defined as a steep density gradient that appears in MARSIS remote sounding ionograms as a horizontal line at frequencies below 0.…
Determining the mass of the planetary candidate HD 114762 b using Gaia
Kiefer, Flavien
The first planetary candidate discovered by Latham et al. (1989, Nature, 339, 38) with radial velocities around a solar-like star other than the Sun, HD 114762 b, was detected with a minimum mass of 11 MJ. The small v sin i ∼ 0 km s-1 that is otherwise measured by spectral analysis indicated that this companion of a late-F su…
Understanding Formation of Young, Distributed Low-mass Stars and Clusters in the W4 Cloud Complex
Samal, Manash R.; Sharma, Saurabh; Panwar, Neelam +2 more
It is well known that most of the stars form in rich clusters. However, recent Spitzer observations have shown that a significant number of stars also form in the distributed mode; their origin is not well understood. In this work, we aim to investigate clustered and distributed modes of star formation in the W4 complex. To do so, we identified an…
Study of the X-ray properties of the neutron star binary 4U 1728-34 from the soft-to-hard state
Motta, S. E.; Belloni, T. M.; Méndez, Mariano +7 more
We studied five XMM-Newton observations of the neutron star binary 4U 1728-34 covering the hard, intermediate and soft spectral states. By jointly fitting the spectra with several reflection models, we obtained an inclination angle of 25°-53° and an iron abundance up to 10 times the solar. From the fits with reflection models, we found that the fl…
A massive cluster at z = 0.288 caught in the process of formation: The case of Abell 959
Brunetti, G.; Shimwell, T. W.; Cassano, R. +9 more
The largest galaxy clusters are observed still to be forming through major cluster-cluster mergers, often showing observational signatures such as radio relics and giant radio haloes. Using LOFAR Two-meter Sky Survey data, we present new detections of both a radio halo (with a spectral index of α _{143}^{1400}=1.48^{+0.06}_{-0.23}) and a likely ra…
Probing X-ray emission in different modes of PSR J1023+0038 with a radio pulsar scenario
Campana, S.; Torres, D. F.; Papitto, A. +3 more
Transitional pulsars provide us with a unique laboratory to study the physics of accretion onto a magnetic neutron star. PSR J1023+0038 (J1023) is the best studied of this class. We investigate the X-ray spectral properties of J1023 in the framework of a working radio pulsar during the active state. We modelled the X-ray spectra in three modes (lo…
ALMA Reveals Kinematics of Super Star Cluster Candidate H72.97-69.39 in LMC-N79
Indebetouw, R.; Nayak, O.; Meixner, M. +6 more
Conditions in super star clusters (SSCs) lead to the formation of dozens of massive stars in close proximity. However, SSCs are rare in the local universe. H72.97-69.39, located in the N79 region of the Large Magellanic Cloud (LMC), is an SSC candidate. In this paper we report the ALMA observations of the potential SSC. ALMA reveals colliding fila…
A compact jet at the infrared heart of the prototypical low-luminosity AGN in NGC 1052
Tristram, K. R. W.; Prieto, M. A.; Asmus, D. +4 more
The feeble radiative efficiency characteristic of Low-Luminosity Active Galactic Nuclei (LLAGNs) is ascribed to a sub-Eddington accretion rate, typically at log (Lbol/Ledd) ≲ -3. At the finest angular resolutions that are attainable nowadays using mid-infrared (mid-IR) interferometry, the prototypical LLAGN in NGC 1052 remain…