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On the Effect of Magnetospheric Shielding on the Lunar Hydrogen Cycle
Farrell, W. M.; Tucker, O. J.; Poppe, A. R.
The global distribution of surficial hydroxyl on the Moon is hypothesized to be derived from the implantation of solar wind protons. As the Moon traverses the geomagnetic tail, it is generally shielded from the solar wind; therefore, the concentration of hydrogen is expected to decrease during full Moon. A Monte Carlo approach is used to model the…
Diagnosing the interstellar medium of galaxies with far-infrared emission lines. I. The [C II] 158 µm line at z ∼ 0
Wang, L.; van der Tak, F. F. S.; Trager, S. C. +2 more
Context. Atomic fine structure lines have been detected in the local Universe and at high redshifts over the past decades. The [C II] emission line at 158 µm is an important observable as it provides constraints on the interstellar medium (ISM) cooling processes.
Aims: We develop a physically motivated framework to simulate the producti…
The active region source of a type III radio storm observed by Parker Solar Probe during encounter 2
Barczynski, K.; Mandrini, C. H.; Bale, S. D. +6 more
Context. We investigated the source of a type III radio burst storm during encounter 2 of NASA's Parker Solar Probe (PSP) mission.
Aims: It was observed that in encounter 2 of NASA's PSP mission there was a large amount of radio activity and, in particular, a noise storm of frequent, small type III bursts from 31 March to 6 April 2019. Our ai…
Physical Parameters of the Multiplanet Systems HD 106315 and GJ 9827
Gorjian, Varoujan; Mayo, Andrew W.; Rice, Malena +42 more
HD 106315 and GJ 9827 are two bright, nearby stars that host multiple super-Earths and sub-Neptunes discovered by K2 that are well suited for atmospheric characterization. We refined the planets' ephemerides through Spitzer transits, enabling accurate transit prediction required for future atmospheric characterization through transmission spectros…
A kinematic study of central compact objects and their host supernova remnants
Becker, Werner; Mayer, Martin G. F.
Context. Central compact objects (CCOs) are a peculiar class of neutron stars, primarily encountered close to the center of young supernova remnants (SNRs) and characterized by thermal X-ray emission. Measurements of their proper motion and the expansion of the parent SNR are powerful tools for constraining explosion kinematics and the age of the …
Hubble spectroscopy of LB-1: Comparison with B+black-hole and Be+stripped-star models
Smartt, S. J.; Dufton, P. L.; Lennon, D. J. +10 more
Context. LB-1 (alias ALS 8775) has been proposed as either an X-ray dim B-type star plus black hole (B+BH) binary or a Be star plus an inflated stripped star (Be+Bstr) binary. The latter hypothesis contingent upon the detection and characterization of the hidden broad-lined star in a composite optical spectrum.
Aims: Our study is aimed at tes…
A feather on the hat: tracing the giant stellar stream around the Sombrero galaxy
Carballo-Bello, Julio A.; Erkal, Denis; Laine, Seppo +7 more
Recent evidence of extremely metal-rich stars found in the Sombrero galaxy (M104) halo suggests that this galaxy has undergone a recent major merger with a relatively massive galaxy. In this paper, we present wide-field deep images of the M104 outskirts obtained with a 18-cm amateur telescope with the purpose of detecting any coherent tidal featur…
An AMUSING look at the host of the periodic nuclear transient ASASSN-14ko reveals a second AGN
Kochanek, C. S.; Galbany, L.; Holoien, Thomas W. -S. +10 more
We present Multi-Unit Spectroscopic Explorer (MUSE) integral-field spectroscopy of ESO 253-G003, which hosts a known active galactic nucleus (AGN) and the periodic nuclear transient ASASSN-14ko, observed as part of the All-weather MUse Supernova Integral-field of Nearby Galaxies survey. The MUSE observations reveal that the inner region hosts two …
Inner and Outer Orbits in 13 Resolved Hierarchical Stellar Systems
Tokovinin, A.
Orbits of inner and outer subsystems in 13 triple or higher-order stellar systems are computed or updated using position measurements and, in three cases, radial velocities. The goal is to determine mutual orbital inclinations, period ratios, and masses to complement the statistics of hierarchical systems. The effect of the subsystems on the motio…
Fragmentation and kinematics in high-mass star formation. CORE-extension targeting two very young high-mass star-forming regions
Henning, Th.; Beuther, H.; Klaassen, P. +24 more
Context. The formation of high-mass star-forming regions from their parental gas cloud and the subsequent fragmentation processes lie at the heart of star formation research.
Aims: We aim to study the dynamical and fragmentation properties at very early evolutionary stages of high-mass star formation.
Methods: Employing the NOrthern Exte…