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A new method for target selection in direct imaging programmes with COPAINS
Bonavita, M.; Biller, B.; Fontanive, C. +2 more
We present COPAINS (Code for Orbital Parametrization of Astrometrically Inferred New Systems), an innovative tool developed to identify previously undiscovered companions detectable via direct imaging, based on changes in stellar proper motions across multiple astrometric catalogues. This powerful procedure allows for dynamical predictions of the …
Large-scale Magnetic Funnels in the Solar Corona
Velli, Marco; Panasenco, Olga; Panasenco, Aram
We describe open coronal magnetic fields with a specific geometry—large-scale coronal magnetic funnels—that are found to play an important role in coronal dynamics. Coronal magnetic funnels can be attributed to three main factors: (i) the presence of pseudostreamer(s), (ii) the presence of filament channels, and (iii) the presence of active region…
Spectral Energy Distribution of Blue Stragglers in the Core of 47 Tucanae
Anderson, Jay; Pallanca, Cristina; Dalessandro, Emanuele +7 more
We have constructed the spectral energy distributions (SEDs) of a sample of blue straggler stars (BSSs) in the core of the globular cluster 47 Tucanae, taking advantage of the large set of high resolution images, ranging from the ultraviolet to the near-infrared, obtained with the Advanced Camera for Surveys/High Resolution Channel of the Hubble S…
An automated search for transiting exocomets
Wyatt, Mark C.; Hodgkin, Simon T.; Kennedy, Grant M. +1 more
This paper discusses an algorithm for detecting single transits in photometric time-series data. Specifically, we aim to identify asymmetric transits with ingress that is more rapid than egress, as expected for cometary bodies with a significant tail. The algorithm is automated, so can be applied to large samples and only a relatively small number…
SDSS J094635.06+101706.1: a redshift one, very radio-loud, γ-ray emitting narrow-line Seyfert 1 galaxy
Komossa, S.; Yuan, Weimin; Yi, Weimin +4 more
As hybrids of narrow-line Seyfert 1 (NLS1) galaxies and blazars, γ-ray emitting NLS1s are important probes of jet physics in the high Eddington-ratio regime. Only very few of them are known to date; the majority of them below redshift z = 0.5. Here, we present the identification of the γ-ray emitting AGN TXS 0943+105 (SDSS J094635.06+101706.1) as …
Evidence for a Merger-induced Shock Wave in ZwCl 0008.8+5215 with Chandra and Suzaku
Di Gennaro, G.; Brunetti, G.; Forman, W. +8 more
We present the results from new deep Chandra (∼410 ks) and Suzaku (∼180 ks) observations of the merging galaxy cluster ZwCl 0008.8+5215 (z = 0.104). Previous radio observations revealed the presence of a double radio relic located diametrically west and east of the cluster center. Using our new Chandra data, we find evidence for the presence of a …
New insights on the puzzling LMXB 1RXS J180408.9-342058: the intermediate state, the clocked type-I X-ray bursts, and much more
Segreto, A.; Ferrigno, C.; Malzac, J. +7 more
1RXS J180408.9-342058 is a low-mass X-ray binary hosting a neutron star, which shows X-ray activity at very different mass-accretion regimes, from very faint to almost the Eddington luminosity. In this work, we present a comprehensive X-ray study of this source using data from the Neil Gehrels Swift Observatory, NuSTAR, and INTEGRAL/JEM-X. In orde…
The Structure of Solar Coronal Mass Ejections in the Extreme-ultraviolet Passbands
Chen, Y.; Song, H. Q.; Zhang, J. +5 more
So far, most studies on the structure of coronal mass ejections (CMEs) are conducted through white-light coronagraphs, demonstrating that about one third of CMEs exhibit the typical three-part structure in the high corona (e.g., beyond 2 {R}⊙ ), i.e., the bright front, the dark cavity, and the bright core. In this paper, we address the …
Magnetic topologies of young suns: the weak-line T Tauri stars TWA 6 and TWA 8A
Donati, J. -F.; Alencar, S. H. P.; Hussain, G. A. J. +5 more
We present a spectropolarimetric study of two weak-line T Tauri stars (wTTSs), TWA 6, and TWA 8A, as part of the MaTYSSE (Magnetic Topologies of Young Stars and the Survival of close-in giant Exoplanets) programme. Both stars display significant Zeeman signatures that we have modelled using Zeeman Doppler Imaging (ZDI). The magnetic field of TWA 6…
Photometric investigations on two totally eclipsing contact binaries: V342 UMa and V509 Cam
Zhang, Yu; Li, Kai; Xia, Qi-Qi +6 more
By analyzing two sets of complete BVRcIc light curves for V342 UMa and three sets of complete BVRcIc light curves for V509 Cam, we determined that the two systems are both W-subtype contact binaries and that V342 UMa manifests a shallow contact configuration, while V509 Cam exhibits a medium contact conf…