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The Effect of Cosmic Rays on Cometary Nuclei. I. Dose Deposition
Gunell, H.; Rubin, M.; De Keyser, J. +9 more
Comets are small bodies thought to contain the most pristine material in the solar system. However, since their formation ≈4.5 Gy ago, they have been altered by different processes. While not exposed to much electromagnetic radiation, they experience intense particle radiation. Galactic cosmic rays and solar energetic particles have a broad spectr…
The Magellanic Edges Survey I: Description and first results
Da Costa, G. S.; Belokurov, V.; Koposov, S. E. +6 more
We present an overview of, and first science results from, the Magellanic Edges Survey (MagES), an ongoing spectroscopic survey mapping the kinematics of red clump and red giant branch stars in the highly substructured periphery of the Magellanic Clouds. In conjunction with Gaia astrometry, MagES yields a sample of ~7000 stars with individual 3D v…
Heating Rates for Protons and Electrons in Polar Coronal Holes: Empirical Constraints from the Ultraviolet Coronagraph Spectrometer
Cranmer, Steven R.
Ultraviolet spectroscopy of the extended solar corona is a powerful tool for measuring the properties of protons, electrons, and heavy ions in the accelerating solar wind. The large coronal holes that expand up from the north and south poles at solar minimum are low-density collisionless regions in which it is possible to detect departures from on…
Spectroscopic and photometric periods of six ultracompact accreting binaries
Dhillon, V. S.; Parsons, Steven G.; Littlefair, S. P. +19 more
Ultracompact accreting binary systems each consist of a stellar remnant accreting helium-enriched material from a compact donor star. Such binaries include two related sub-classes, AM CVn-type binaries and helium cataclysmic variables, in both of which the central star is a white dwarf. We present a spectroscopic and photometric study of six accre…
A Hard Look at Local, Optically Selected, Obscured Seyfert Galaxies
Kaastra, J. S.; Stern, D.; Brandt, W. N. +11 more
We study the X-ray spectra of a sample of 19 obscured, optically selected Seyfert galaxies (Sy 1.8, 1.9, and 2) in the local universe (d ≤ 175 Mpc), drawn from the CfA Seyfert sample. Our analysis is driven by the high sensitivity of NuSTAR in the hard X-rays, coupled with soft X-ray spectra using XMM-Newton, Chandra, Suzaku, and Swift/XRT. We als…
Binary Stars in Upper Scorpius
Tokovinin, Andrei; Briceño, Cesar
To address the statistics of binary stars in the 8 Myr old Upper Scorpius (USco) star formation region, we conducted a speckle interferometric survey of 614 association members more massive than 0.4 {{ \mathcal M }}⊙ (spectral types earlier than M3V) based on the list of Luhman et al. (2018). We resolved 187 pairs, 55 of which are new …
Asymmetric expansion of coronal mass ejections in the low corona
Cremades, H.; Iglesias, F. A.; Merenda, L. A.
Aims: Understanding how magnetic fields are structured within coronal mass ejections (CMEs), and how they evolve from the low corona into the heliosphere, is a major challenge for space weather forecasting and for solar physics. The study of CME morphology is a particularly auspicious approach to this problem, given that it holds a close rela…
Vetting the optical transient candidates detected by the GWAC network using convolutional neural networks
Bertin, E.; Xu, Y.; Leroy, N. +11 more
The observation of the transient sky through a multitude of astrophysical messengers has led to several scientific breakthroughs in the last two decades, thanks to the fast evolution of the observational techniques and strategies employed by the astronomers. Now, it requires to be able to coordinate multiwavelength and multimessenger follow-up cam…
The ASAS-SN catalogue of variable stars - VIII. 'Dipper' stars in the Lupus star-forming region
Kochanek, C. S.; Stanek, K. Z.; Shappee, B. J. +9 more
Some young stellar objects such as T Tauri-like 'dipper' stars vary due to transient partial occultation by circumstellar dust, and observations of this phenomenon inform us of conditions in the planet-forming zones close to these stars. Although many dipper stars have been identified with space missions such as Kepler/K2, ground-based telescopes …
Tracing the anemic stellar halo of M 101
Bell, Eric F.; Holwerda, Benne W.; Monachesi, Antonela +3 more
Models of galaxy formation in a cosmological context predict that massive disk galaxies should have structured extended stellar halos. Recent studies in integrated light, however, report that a few galaxies, including the nearby disk galaxy M 101, have no measurable stellar halos to the detection limit. We aim to quantify the stellar content and s…