Search Publications
Hot Jupiters, cold kinematics. High phase space densities of host stars reflect an age bias
Mustill, Alexander J.; Davies, Melvyn B.; Lambrechts, Michiel
Context. The birth environments of planetary systems are thought to influence planet formation and orbital evolution through external photoevaporation and stellar flybys. Recent work has claimed observational support for this, in the form of a correlation between the properties of planetary systems and the local Galactic phase space density of the…
Quantitative spectroscopy of B-type supergiants
Butler, K.; Weßmayer, D.; Przybilla, N.
Context. B-type supergiants are versatile tools to address a number of highly-relevant astrophysical topics, ranging from stellar atmospheres over stellar and galactic evolution to the characterisation of interstellar sightlines and to the cosmic distance scale.
Aims: A hybrid non-local thermodynamic equilibrium (LTE) approach, involving line…
A double-peaked Lyman-α emitter with a stronger blue peak multiply imaged by the galaxy cluster RXC J0018.5+1626
Charlot, Stéphane; Bradač, Maruša; Strait, Victoria +10 more
We report the discovery of a double-peaked Lyman-α (Ly α) emitter (LAE) at z = 3.2177 ± 0.0001 in VLT/MUSE data. The galaxy is strongly lensed by the galaxy cluster RXC J0018.5+1626 recently observed in the RELICS survey, and the double-peaked Ly α emission is clearly detected in the two counter images in the MUSE field of view. We measure a relat…
Modeling Balmer line signatures of stellar CMEs
Heinzel, P.; Odert, P.; Leitzinger, M.
From the Sun, we know that coronal mass ejections (CMEs) are a transient phenomenon, often correlated with flares. They have an impact on solar mass- and angular momentum loss, and therefore solar evolution, and make a significant part of space weather. The same is true for stars, but stellar CMEs are still not well constrained, although new metho…
Dissecting Nearby Galaxies with piXedfit. II. Spatially Resolved Scaling Relations among Stars, Dust, and Gas
Tacchella, Sandro; Wu, Po-Feng; Morishita, Takahiro +5 more
We study spatially resolved scaling relations among stars, dust, and gas in ten nearby spiral galaxies. In a preceding paper, we have derived spatially resolved properties of the stellar population and dust by a panchromatic spectral energy distribution fitting using piXedfit. Now, we investigate resolved star formation ( ${{\rm{\Sigma }}}_{{{\rm{…
The whisper of a whimper of a bang: 2400 d of the Type Ia SN 2011fe reveals the decay of 55Fe
Kochanek, C. S.; Stanek, K. Z.; Ashall, C. +4 more
We analyse new multifilter Hubble Space Telescope (HST) photometry of the normal Type Ia supernova (SN Ia) 2011fe out to ≈2400 d after maximum light, the latest observations to date of a SN Ia. We model the pseudo-bolometric light curve with a simple radioactive decay model and find energy input from both 57Co and 55Fe are ne…
Coronal mass ejection followed by a prominence eruption and a plasma blob as observed by Solar Orbiter
Heinzel, P.; Mierla, M.; Zhukov, A. N. +26 more
Context. On 2021 February 12, two subsequent eruptions occurred above the western limb of the Sun, as seen along the Sun-Earth line. The first event was a typical slow coronal mass ejection (CME), followed ∼7 h later by a smaller and collimated prominence eruption, originating south of the CME, followed by a plasma blob. These events were observed…
Morpho-kinematic Properties of Wolf-Rayet Planetary Nebulae
Danehkar, A.
The majority of planetary nebulae (PNs) show axisymmetric morphologies, whose causes are not well understood. In this work, we present spatially resolved kinematic observations of 14 Galactic PNs surrounding Wolf-Rayet ([WR]) and weak emission-line stars (wels), based on the Hα and [N II] emission taken with the Wide Field Spectrograph on the Aust…
Strategies for Determining the Cascade Rate in MHD Turbulence: Isotropy, Anisotropy, and Spacecraft Sampling
Shay, Michael A.; Oughton, Sean; Yang, Yan +6 more
Exact laws for evaluating cascade rates, tracing back to the Kolmogorov "4/5" law, have been extended to many systems of interest including magnetohydrodynamics (MHD), and compressible flows of the magnetofluid and ordinary fluid types. It is understood that implementations may be limited by the quantity of available data and by the lack of turbul…
Spectropolarimetry of magnetic Chemically Peculiar stars in the Orion OB1 association
Semenko, Eugene; Romanyuk, Iosif; Yakunin, Ilya +2 more
We summarize the results of a spectropolarimetric survey of 56 chemically peculiar (CP) stars in the association of Orion OB1. We uniformly collected the observational material with the 6-m telescope BTA of the Special Astrophysical Observatory in 2013-2021. We identify 14 new magnetic CP stars with a longitudinal magnetic field exceeding approxim…