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An optimized survey strategy for the ERIS/NIX imager: searching for young giant exoplanets and very low mass brown dwarfs using the K-peak custom photometric filter
Allers, Katelyn; Kenworthy, Matthew A.; Bonavita, Mariangela +5 more
We present optimal survey strategies for the upcoming NIX imager, part of the Enhanced Resolution Imager and Spectrograph instrument to be installed on the Very Large Telescope. We will use a custom 2.2 µm K-peak filter to optimize the efficiency of a future large-scale direct imaging survey, aiming to detect brown dwarfs and giant planets around …
Discovery of a Brown Dwarf with Quasi-spherical Mass Loss
Dunham, Michael M.; Jofré, Paula; Cieza, Lucas A. +14 more
We report the serendipitous discovery of an elliptical shell of CO associated with the faint stellar object SSTc2d J163134.1-240060 as part of the "Ophiuchus Disk Survey Employing ALMA" (ODISEA), a project aiming to study the entire population of protoplanetary disks in the Ophiuchus Molecular Cloud from 230 GHz continuum emission and 12
A Semi-empirical Approach to the Dynamic Coupling of CMEs and Solar Wind
Riley, P.; Corona-Romero, P.; González-Avilés, J. J.
Coronal mass ejections (CMEs) are one of the most relevant phenomena for space weather. Moreover, CMEs can negatively affect essential services and facilities. Therefore, to protect society, we require well-grounded knowledge of the physics that governs the propagation of CMEs from near the Sun to the orbit of Earth. In this work, we deduce expres…
The 6.7 keV thermal emission lines in the stellar flare spectra of two chromospherically active Binaries: Algol and GT Mus
Eze, Ambrose Chukwudi; Esaenwi, Sudum; Madu, Fidelis Okey
Chromospherically active binaries' (CABs) are late-type evolved stars with strong chromosphere/coronae and high flare activity levels. Starspot evolution in these CABs and binaries reveals strong stellar and chromospheric activities. In binaries, the tidal interaction via the internal dynamo motion, during rapid rotation of the component stars gen…
A TESS search for donor-star pulsations in high-mass X-ray binaries
Ramsay, Gavin; Hakala, Pasi; Charles, Philip A.
Ground-based optical photometry of the counterparts of high-mass X-ray binaries (HMXBs) has revealed the presence of periodic modulations on time-scales of ~0.3-0.5 d. More recent space-based observations (CoRoT and TESS) of OB and Be stars have shown that pulsations caused by p and g modes are common in early-type stars. We have therefore underta…
Magnetic field measurements of sharp-lined Ap stars
Ilyin, I.; Hubrig, S.; Schöller, M. +2 more
Previous observations suggested that Ap and Bp stars exhibit a bimodal distribution of surface magnetic field strengths and that actually only few or no stars exist with magnetic dipole field strengths below 300 G down to a few Gauss. As the number of Ap and Bp stars currently known to possess weak magnetic fields is not large, it is necessary to …
Mass assembly and active galactic nucleus activity at z ≳ 1.5 in the dense environment of XDCP J0044.0-2033
Tozzi, P.; Merlin, E.; Bongiorno, A. +4 more
Context. XDCP J0044.0−2033 is the most massive galaxy cluster known at z > 1.5 and its core shows a high density of galaxies, which are experiencing mergers and hosting nuclear activity.
Aims: We present a multi-wavelength study of a region of 24 kpc × 24 kpc located ∼157 kpc from the center of the cluster, for which we have photometric an…
Near-infrared detection of H2 flows in the core of the Mon R1 association
Movsessian, T. A.; Andreasyan, H. R.; Tatarnikov, A. M. +1 more
We report the discovery of four new H2 jets in the Mon R1 star-forming region in images obtained with the 2.5-m telescope of the Caucasian Mountain Observatory of Sternberg Astronomical Institute (SAI), Moscow State University (MSU) through a filter centred on the H2 1-0 S(1) emission line. This discovery confirms the nature …
Extending the energy range of AstroSat-CZTI up to 380 keV with compton spectroscopy
Rao, A. R.; Bhalerao, Varun; Mithun, N. P. S. +4 more
The CZTI (Cadmium Zinc Telluride Imager) onboard AstroSat is a high energy coded mask imager and spectrometer in the energy range of 20-100 keV. Above 100 keV, the dominance of Compton scattering cross-section in CZTI results in a significant number of 2-pixel Compton events and these have been successfully utilized for polarization analysis of Cr…
Yet another star in the Albireo system. The discovery of Albireo Ad
Bastian, U.; Schröder, K. -P.; Mittag, M. +1 more
Context. Albireo is a well-known bright visual double star. It is still unclear if the components A and B form a gravitationally bound system. The component Albireo A is itself a binary star. The orbital parameters of the Albireo Aa, Ac system have been determined only recently. Thus, Albireo is still of interest for current research.
Aims: W…