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TT Arietis: 40 yr of photometry
Bruch, Albert
In an effort to characterize variations on the time-scale of hours and smaller during the high and low states of the nova-like variable TT Ari, light curves taken over the course of more than 40 yr are analysed. It is found that the well-known negative superhump observed during the high state persists until the present day at an average period of …
Evidence for a clumpy disc-wind in the star-forming Seyfert 2 galaxy MCG-03-58-007
Campana, S.; Schartel, N.; Santos-Lleó, M. +9 more
We report the results of a detailed analysis of a deep simultaneous 130 ksXMM-Newton and NuSTAR observation of the nearby (z = 0.0315) and bright (L_bol∼ 3× 10^{45} erg s^{-1}) starburst-active galactic nucleus (AGN) Seyfert 2 system: MCG-03-58-007. From the broad-band fitting we show that most of the obscuration needs to be modelled with a toroid…
Near-infrared imaging polarimetry toward M 17 SWex
Kusune, Takayoshi; Nakamura, Fumitaka; Tamura, Motohide +7 more
We conducted near-infrared (JHK_s) imaging polarimetry toward the infrared dark cloud (IRDC) M 17 SWex, including almost all of the IRDC filaments as well as its outskirts, with the polarimeter SIRPOL on the IRSF 1.4 m telescope. We revealed the magnetic fields of M 17 SWex with our polarization-detected sources that were selected by some criteria…
In-flight photometry extraction of PLATO targets. Optimal apertures for detecting extrasolar planets
Cabrera, J.; Samadi, R.; Börner, A. +7 more
Context. The ESA PLATO space mission is devoted to unveiling and characterizing new extrasolar planets and their host stars. This mission will encompass a very large (>2100 deg2) field of view, granting it the potential to survey up to one million stars depending on the final observation strategy. The telemetry budget of the spacecra…
Molecular envelope around the HII region RCW 120
Wiebe, D. S.; Anderson, L. D.; Kirsanova, M. S. +5 more
The H II region RCW 120 is a well-known object, which is often considered as a target to verify theoretical models of gas and dust dynamics in the interstellar medium. However, the exact geometry of RCW 120 is still a matter of debate. In this work, we analyse observational data on molecular emission in RCW 120 and show that 13CO(2-1) a…
Using deep Residual Networks to search for galaxy-Ly α emitter lens candidates based on spectroscopic selection
Wang, Jiancheng; Shu, Yiping; Li, Rui +4 more
More than 100 galaxy-scale strong gravitational lens systems have been found by searching for the emission lines coming from galaxies with redshifts higher than the lens galaxies. Based on this spectroscopic-selection method, we introduce the deep Residual Networks (ResNet; a kind of deep Convolutional Neural Networks) to search for the galaxy-Ly …
CI Camelopardalis: The first sgB[e]-high mass X-ray binary twenty years on: A supernova imposter in our own Galaxy?
Bartlett, E. S.; Negueruela, I.; Clark, J. S.
Context. The Galactic supergiant B[e] star CI Camelopardalis (CI Cam) was the first sgB[e] star detected during an X-ray outburst. The star brightened to ∼2 Crab in the X-ray regime (∼5 × 10-8 ergs cm-2 s-1 in the 2-25 keV range) within hours before decaying to a quiescent level in less than two weeks, clearly indi…
When Does the Onset of Multiple Stellar Populations in Star Clusters Occur? Detection of Enriched Stellar Populations in NGC 2121
de Grijs, Richard; Li, Chengyuan
Star-to-star light-element abundance variations, known as multiple stellar populations (MPs), are common in almost all Galactic globular clusters. Recently, MPs have also been detected in a number of massive clusters with ages in excess of 2 Gyr in the Large Magellanic Cloud (LMC), thus indicating that age is likely a control parameter for the pre…
RPC-MIP observations at comet 67P/Churyumov-Gerasimenko explained by a model including a sheath and two populations of electrons
Henri, P.; Vallières, X.; Wattieaux, G. +2 more
The response of the mutual impedance probe RPC-MIP on board Rosetta orbiter electrostatically modeled considering an unmagnetized and collisionless plasma with two Maxwellian electron populations. A vacuum sheath surrounding the probe was considered in our model in order to take the ion sheath into account that is located around the probe, which i…
MoMo: a new empirical model of the Mars ionospheric total electron content based on Mars Express MARSIS data
Peter, Kerstin; Witasse, Olivier; Kofman, Wlodek +5 more
Aims: Several scientific landers and rovers have reached the Martian surface since the 1970s. Communication between the asset (i.e., lander or rover) and Mars orbiters or Earth antennas uses radio signals in UHF to X-band frequencies passing through the Mars' ionosphere. It is consequently necessary to take into account electron density variation …