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Exploring the Diversity of Faint Satellites in the M81 Group
Bell, Eric F.; Monachesi, Antonela; Bailin, Jeremy +9 more
In the last decade, we have been able to probe further down the galaxy luminosity function than ever before and expand into the regime of ultra-faint dwarfs (UFDs), which are some of the best probes we have of small-scale cosmology and galaxy formation. Digital sky surveys have enabled the discovery and study of these incredibly low-mass, highly d…
On the Origin of Infrared Bands Attributed to Tryptophan in Spitzer Observations of IC 348
McGuire, Brett A.; Jørgensen, Jes K.; Schroetter, Ilane +12 more
Infrared emission features toward interstellar gas of the IC 348 star cluster in Perseus have been recently proposed to originate from the amino acid tryptophan. The assignment was based on laboratory infrared spectra of tryptophan pressed into pellets, a method which is known to cause large frequency shifts compared to the gas phase. We assess th…
Study of Solar Motion and Galactic Kinematical Characteristics Using Recent Gaia Data
Elsanhoury, W. H.; Ayari, N.
Our objective is to construct models of the velocity ellipsoid and the retrieved Solar motion for program stars with 4924 points within the Solar neighborhood (∼2 kpc). In which 1374 early types (B5, A0, A5, F0, and F5) and about 3550 late types (G0, G5, K0, and K5) with more recent data source with Gaia DR3. Based on space velocity vectors $(\bar…
Kinetic numerical scaling of Alfven cyclotron instability in non-thermal solar wind plasmas
Shahzad, Muhammad Ahsan; Aman-ur-Rehman; Bilal, Muhammad +3 more
Linear plasma kinetic theory for a non-thermal, magnetized, homogeneous, and collisionless plasma is incorporated to study Alfvén cyclotron instability (ACI) driven by the ion/proton perpendicular temperature anisotropy (T⊥p/T∥p>1) ( ⊥, ∥ symbols designate directions perpendicular and parallel to ambient magnetic field, respectively), and the w…
New radio continuum study of the large magellanic cloud supernova remnant N49
Sasaki, Manami; Haberl, Frank; Kavanagh, Patrick +12 more
We present new Australia Telescope Compact Array (ATCA) radio observations towards N 49, one of the brightest extragalactic supernova remnants (SNRs) located in the Large Magellanic Cloud (LMC). Our new and archival ATCA radio observations were analysed along with Chandra X-ray data. These observations show a prominent 'bullet' shaped feature beyo…
Gaia21blx: Complete resolution of a binary microlensing event in the Galactic disk
Rybicki, K. A.; Wyrzykowski, Ł.; Snodgrass, C. +24 more
Context. Gravitational microlensing is a method that is used to discover planet-hosting systems at distances of several kiloparsec in the Galactic disk and bulge. We present the analysis of a microlensing event reported by the Gaia photometric alert team that might have a bright lens.
Aims: In order to infer the mass and distance to the lensi…
High-resolution transmission spectroscopy of the hot-Saturn HD 149026b
Haardt, Francesco; Rainer, Monica; Borsa, Francesco +1 more
Advances in modern technology have enabled the characterization of exoplanetary atmospheres, which can be achieved by exploitation of the transmission spectroscopy technique. We performed visible (VIS) and near-infrared (NIR) high-resolution spectroscopic observations of one transit of HD 149026b, a close-in orbit sub-Saturn exoplanet by using the…
The high-energy cyclotron line in 2S 1417-624 discovered with Insight-HXMT during the 2018 outburst
Wang, W.; Santangelo, A.; Serim, M. M. +7 more
We report a detailed timing and spectral analysis of the X-ray pulsar 2S 1417‑624 using the data from Insight-HXMT during the 2018 outburst. The pulse profiles are highly variable with respect to both unabsorbed flux and energy. A double-peaked pulse profile from the low flux evolved to a multi-peaked shape in the high-flux state. The pulse fracti…
Differential Rotation of CoRoT Stars and a Kepler Binary Star from Starspot Transit Mapping
Valio, Adriana; Araújo, Alexandre; Menezes, Fabian
While direct magnetic field measurements are rare for slowly rotating stars, spots observed during planetary transits provide a potential indicator of magnetic activity on stellar surfaces. Moreover, the rotation of the stellar surface can be probed by monitoring the spots' position with time in subsequent transits. This study investigates the dyn…
Looking for timing variations in the transits of 16 exoplanets
Aksaker, N.; Southworth, J.; Mancini, L. +27 more
We update the ephemerides of 16 transiting exoplanets using our ground-based observations, new Transiting Exoplanet Survey Satellite data, and previously published observations including those of amateur astronomers. All these light curves were modelled by making use of a set of quantitative criteria with the EXOFAST code to obtain mid-transit tim…