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Orbital and atmospheric parameters of two wide O-type subdwarf binaries: BD−11o162 and Feige 80
Németh, Péter; Tkachenko, Andrew; van Winckel, Hans +4 more
Context. There are 23 long-period binary systems discovered to date that contain a B-type hot subdwarf whose orbital parameters have been fully solved. They evolve into O-type subdwarfs (sdO) once the helium burning transitions from the core to the He shell. Their study will help constraint parameters on the formation and evolution of these binari…
An intermediate polar candidate toward the Galactic plane
Campana, S.; Haberl, F.; Ponti, G. +5 more
Context. For the past decade, it has been suggested that intermediate polars (IPs), a subclass of magnetic cataclysmic variables (CVs), are one of the main contributors to the hard diffuse X-ray emission from the Galactic center (GC) and Galactic ridge.
Aims: In our ongoing XMM-Newton survey of the central region of the Galactic disk (20° ×2°…
Convective storms in closed cyclones in Jupiter: (II) numerical modeling
Hueso, Ricardo; Sánchez-Lavega, Agustín; Legarreta, Jon +1 more
On May 31, 2020 a convective storm appeared in one small cyclone in the South Temperate Belt (STB) of Jupiter. The storm, nicknamed as Clyde's Spot, had an explosive start and quickly diminished in activity in a few days. However, it left a highly turbulent cyclone as a remnant that evolved to become a turbulent segment of the STB in a time-scale …
Analytic modeling of recurrent Forbush decreases caused by corotating interaction regions
Vršnak, B.; Dumbović, M.; Heber, B. +1 more
Context. On scales of days, the galactic cosmic ray (GCR) flux is affected by coronal mass ejections and corotating interaction regions (CIRs), causing so-called Forbush decreases and recurrent Forbush decreases (RFDs), respectively.
Aims: We explain the properties and behavior of RFDs recorded at about 1 au that are caused by CIRs generated …
On the Characterization of GJ 504: A Magnetically Active Planet-host Star Observed by the Transiting Exoplanet Survey Satellite (TESS)
Stassun, Keivan G.; García, Rafael A.; Corsaro, Enrico +11 more
We present the results of the analysis of the photometric data collected in long- and short-cadence mode by the Transiting Exoplanet Survey Satellite for GJ 504, a well-studied planet-hosting solar-like star, whose fundamental parameters have been largely debated during the last decade. Several attempts have been made by the present authors to iso…
Numerical simulations of radar echoes rule out basal CO2 ice deposits at Ultimi Scopuli, Mars
Orosei, Roberto; Cartacci, Marco; Cicchetti, Andrea +10 more
The principal objective of the radar sounder MARSIS experiment is to look for ice and water in the Martian subsurface. One particular focus of investigations, since 2005, has been the search for basal liquid water in the south polar layered deposits (SPLD). Anomalously strong basal echoes detected from four distinct areas at the base of the deposi…
Using Multiple Emission Line Ratios to Constrain the Slope of the Dust Attenuation Law
Papovich, Casey; Cleri, Nikko J.; Trump, Jonathan R. +2 more
We explore the possibility and practical limitations of using a three-line approach to measure both the slope and normalization of the dust attenuation law in individual galaxies. To do this, we focus on a sample of 11 galaxies with existing ground-based Balmer Hα and Hβ measurements from slit spectra, plus space-based grism constraints on Paschen…
The Missing Metal Problem in Galaxy Clusters: Characterizing the Early Enrichment Population
Bregman, Joel N.; Blackwell, Anne E.; Snowden, Steven L.
Rich and poor galaxy clusters have the same measured halo metallicity, 0.35-0.4 Z ⊙, even though they are an order of magnitude apart in stellar fraction, M */M gas. The measured intracluster medium (ICM) metallicity in high-mass clusters cannot be explained by the visible stellar population as stars typically make…
HORuS transmission spectroscopy and revised planetary parameters of KELT-7 b
Rebolo, R.; del Burgo, C.; Montes, D. +7 more
We report on the high-resolution spectroscopic observations of two planetary transits of the hot Jupiter KELT-7b (Mp = 1.28 ± 0.17MJup, Teq = 2028 K) observed with the High Optical Resolution Spectrograph (HORuS) mounted on the 10.4-m Gran Telescopio Canarias (GTC). A new set of stellar parameters are obtained for …
Galaxy Rotation Parameters from OB2 Stars with Proper Motions and Parallaxes from the Gaia EDR3 Catalog
Bobylev, V. V.; Bajkova, A. T.
We have analyzed the kinematics of OB2 stars with proper motions and parallaxes selected by Xu et al. from the Gaia EDR3 catalog. The relative parallax errors for all the stars in this sample do not exceed 10%. Based on a sample of 9750 stars, the group velocity components ${{(U,V,W)}_{ \odot }} = $ (7.21, 7.46, 8.52) ± (0.13, 0.20, 0.10) km/s wer…