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Multiplicity of Galactic Cepheids from long-baseline interferometry: V. High-accuracy orbital parallax and mass of SU Cygni
Kervella, P.; Mérand, A.; Schaefer, G. H. +23 more
Aims. We aim to accurately measure the dynamical mass and distance of Cepheids by combining radial velocity measurements with interferometric observations. Cepheid mass measurements are particularly necessary for solving the Cepheid mass discrepancy, while independent distance determinations provide a crucial test of the period–luminosity relation…
Small and Close-in Planets are Uncommon Around A-type Stars
Giacalone, Steven; Dressing, Courtney D.
The Kepler and K2 missions enabled robust calculations of planet occurrence rates around FGKM-type stars. However, these missions observed too few stars with earlier spectral types to tightly constrain the occurrence rates of planets orbiting hotter stars. Using TESS, we calculate the occurrence rate of small (1 R⊕ < Rp &l…
Low-mass runaways from the Orion Nebula Cluster - kinematic age constraints on star cluster formation
Tan, Jonathan C.; Eyer, Laurent; Armstrong, Joseph J. +2 more
In their early, formative stages star clusters can undergo rapid dynamical evolution leading to strong gravitational interactions and ejection of "runaway" stars at high velocities. While O/B runaway stars have been well studied, lower-mass runaways are so far very poorly characterized, even though they are expected to be much more common. We carr…
Rising Near-ultraviolet Spectra in Stellar Megaflares
Notsu, Yuta; Kowalski, Adam F.; Maehara, Hiroyuki +5 more
Flares from M dwarf stars can attain energies up to 104 times larger than solar flares but are generally thought to result from similar processes of magnetic energy release and particle acceleration. Larger heating rates in the low atmosphere are needed to reproduce the shape and strength of the observed continua in stellar flares, whic…
eRO-ExTra: eROSITA extragalactic non-AGN X-ray transients and variables in eRASS1 and eRASS2
Shirley, R.; Salvato, M.; Liu, Z. +20 more
Aims. The eROSITA telescope aboard the Spectrum Roentgen Gamma (SRG) satellite provides an unprecedented opportunity to explore the transient and variable extragalactic X-ray sky due to the sensitivity, sky coverage, and cadence of the all-sky survey. While previous studies showed the dominance of regular active galactic nuclei (AGN) variability, …
Three-body exchanges with primordial black holes
Sinha, Kuver; Bhalla, Badal; Lehmann, Benjamin V. +1 more
The abundance of massive primordial black holes has historically been constrained by dynamical probes. Since these objects can participate in hard few-body scattering processes, they can readily transfer energy to stellar systems and, in particular, disrupt wide binaries. However, disruption is not the only possible outcome of such few-body proces…
Tracing the Milky Way spiral arms with 26Al: The role of nova systems in the 2D distribution of 26Al
Della Valle, M.; Matteucci, F.; Spitoni, E. +2 more
Context. Massive stars are one of the most important and investigated astrophysical production sites of 26Al, a short-lived radioisotope with an ~1 Myr half-life. Its short lifetime prevents us from observing its complete chemical history, and only the 26Al that was recently produced by massive stars can be observed. Hence, i…
Dynamic Imprints of Colliding-wind Dust Formation from WR 140
Hamaguchi, Kenji; Corcoran, Michael F.; Morris, Mark R. +24 more
Carbon-rich Wolf–Rayet (WR) binaries are a prominent source of carbonaceous dust that contribute to the dust budget of galaxies. The "textbook" example of an episodic dust-producing WR binary, WR 140 (HD 193793), provides us with an ideal laboratory for investigating the dust physics and kinematics in an extreme environment. This study is among th…
Precision measurements of the magnetic parameters of LISA Pathfinder test masses
Mendes, L.; Russano, G.; Nofrarias, M. +76 more
A precise characterization of the magnetic properties of LISA Pathfinder free falling test-masses is of special interest for future gravitational wave observatory in space. Magnetic forces have an important impact on the instrument sensitivity in the low frequency regime below the millihertz. In this paper we report on the magnetic injection exper…
Newborn Be star systems observed shortly after mass transfer
Rivinius, Th.; Buil, C.; Heathcote, B. +24 more
Context. Many classical Be stars acquire their very rapid rotation by mass- and angular-momentum transfer in massive binaries, marking the first phase of the evolutionary chain. Later-stage products, such as Be+subdwarf- and Be+neutron-star binaries (Be X-ray binaries), are also well known, although the search for definitive proof of Be+white dwar…