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Spectral energy distributions of classical Cepheids in the Magellanic Clouds
Groenewegen, M. A. T.; Lub, J.
In this study, we constructed spectral energy distributions (SEDs) for a sample of 142 Large Magellanic Cloud (LMC) and 77 Small Magellanic Cloud (SMC) fundamental-mode classical Cepheids (CCs) using photometric data from the literature. When possible, the data were taken to be representative of mean light or averaged over the light curve. The sam…
Constraining dark matter substructure with Gaia wide binaries
Buckley, Matthew R.; Ramirez, Edward D.
We use a catalogue of stellar binaries with wide separations (up to 1 pc) identified by the Gaia satellite to constrain the presence of extended substructure within the Milky Way galaxy. Heating of the binaries through repeated encounters with substructure results in a characteristic distribution of binary separations, allowing constraints to be p…
New insight into the massive eccentric binary HD 165052: self-consistent orbital solution, apsidal motion, and fundamental parameters
Rauw, G.; Rosu, S.; Eenens, P. +1 more
HD 165052 is a short-period massive eccentric binary system that undergoes apsidal motion. As the rate of apsidal motion is directly related to the internal structure constants of the binary components, its study allows getting insight into the internal structure of the stars. We use medium- and high-resolution spectroscopic observations of HD 165…
Far beyond the Sun - II. Probing the stellar magnetism of the young Sun ι Horologii from the photosphere to its corona
Sanz-Forcada, J.; Redfield, S.; Drake, J. J. +14 more
A comprehensive multiwavelength campaign has been carried out to probe stellar activity and variability in the young Sun-like star ι-Horologii. We present the results from long-term spectropolarimetric monitoring of the system by using the ultra-stable spectropolarimeter/velocimeter HARPS at the ESO 3.6-m telescope. Additionally, we included high-…
The Z Camelopardalis-type Star AY Piscium: Stellar and Accretion Disk Parameters
Zharikov, Sergey; Merc, Jaroslav; Kára, Jan +5 more
We present a new study of the Z Cam-type eclipsing cataclysmic variable AY Piscium with the aim of determining the fundamental parameters of the system and the structure of the accretion flow therein. We use time-resolved photometric observations supplemented by spectroscopy in the standstill, to which we applied our light-curve modeling technique…
Understanding the Planetary Formation and Evolution in Star Clusters (UPiC). I. Evidence of Hot Giant Exoplanets Formation Timescales
Zhou, Ji-Lin; Dai, Yuan-Zhe; Liu, Hui-Gen +1 more
Planets in young star clusters could shed light on planet formation and evolution since star clusters can provide accurate age estimation. However, the number of transiting planets detected in clusters was only ~30, too small for statistical analysis. Thanks to the unprecedented high-precision astrometric data provided by Gaia DR2 and Gaia DR3, ma…
Full-wave modeling of EMIC wave packets: ducted propagation and reflected waves
Ma, Qianli; Shen, Xiao-Chen; Hanzelka, Miroslav +4 more
Electromagnetic ion cyclotron (EMIC) waves can scatter radiation belt electrons with energies of a few hundred keV and higher. To accurately predict this scattering and the resulting precipitation of these relativistic electrons on short time scales, we need detailed knowledge of the wave field's spatio-temporal evolution, which cannot be obtained…
TREX: Kinematic Characterization of a High-dispersion Intermediate-age Stellar Component in M33
Williams, Benjamin F.; Gilbert, Karoline M.; Guhathakurta, Puragra +7 more
The dwarf galaxy Triangulum (M33) presents an interesting testbed for studying stellar halo formation: it is sufficiently massive so as to have likely accreted smaller satellites, but also lies within the regime where feedback and other "in situ" formation mechanisms are expected to play a role. In this work, we analyze the line-of-sight kinematic…
Deep search for glycine conformers in Barnard 5
Bergman, P.; Charnley, S. B.; Carl, Tadeus +3 more
One of the most fundamental hypotheses in astrochemistry and astrobiology states that crucial biotic molecules like glycine (NH2CH2COOH) found in meteorites and comets are inherited from early phases of star formation. Most observational searches for glycine in the interstellar medium have focused on warm high-mass molecular …
CWISE J105512.11+544328.3: A Nearby Y Dwarf Spectroscopically Confirmed with Keck/NIRES
Meisner, Aaron M.; Cushing, Michael C.; Kirkpatrick, J. Davy +14 more
Y dwarfs, the coolest known spectral class of brown dwarfs, overlap in mass and temperature with giant exoplanets, providing unique laboratories for studying low-temperature atmospheres. However, only a fraction of Y dwarf candidates have been spectroscopically confirmed. We present Keck/NIRES near-infrared spectroscopy of the nearby (d ≈ 6-8 pc) …