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Sites of Planet Formation in Binary Systems. II. Double the Disks in DF Tau
Tang, Shih-Yun; Johns-Krull, Christopher M.; Jensen, Eric L. N. +8 more
This article presents the latest results of our Atacama Large Millimeter/submillimeter Array (ALMA) program to study circumstellar disk characteristics as a function of orbital and stellar properties in a sample of young binary star systems known to host at least one disk. Optical and infrared observations of the eccentric, ∼48 yr period binary DF…
Probing 3D Magnetic Fields Using Starlight Polarization and Grain Alignment Theory
Hoang, Thiem; Truong, Bao
Polarization of starlight induced by dust grains aligned with the magnetic field (hereafter B-field) is widely used to measure the 2D B-fields projected onto the plane-of-sky. Here, we introduce a new method to infer 3D B-fields using starlight polarization. We show that the inclination angle or line-of-sight component of B-fields can be constrain…
The PHANGS-HST-Hα Survey: Warm Ionized Gas Physics at High Angular Resolution in Nearby Galaxies with the Hubble Space Telescope
Leroy, Adam K.; Rosolowsky, Erik; Chevance, Mélanie +38 more
The PHANGS project is assembling a comprehensive, multiwavelength data set of nearby (∼5–20 Mpc), massive star-forming galaxies to enable multiphase, multiscale investigations into the processes that drive star formation and galaxy evolution. To date, large survey programs have provided molecular gas (CO) cubes with the Atacama Large Millimeter/su…
Evidence of Truly Young High-α Dwarf Stars
Angus, Ruth; Bedell, Megan; Claytor, Zachary R. +14 more
The existence of high-α stars with inferred ages <6 Gyr has been confirmed recently with large spectroscopic and photometric surveys. However, stellar mergers or binary interactions can induce properties associated with young ages, such as high mass, rapid rotation, or high activity, even in old populations. Literature studies have confirmed th…
A recent confirmation of the wide binary gravitational anomaly
Kroupa, Pavel; Hernandez, X.
Concerning recent published studies exploring the presence or otherwise of a gravitational anomaly at low accelerations in wide binary stars as observed by the Gaia satellite, the paper published by Cookson on the subject last year presents an interesting case. In that study, RMS values of binned relative internal one-dimensional velocities for wi…
Detection and characterization of giant planets with Gaia astrometry
Castro-Ginard, A.; Brown, A. G. A.; Casey, A. R. +1 more
Astrometric observations with Gaia are expected to play a valuable role in future exoplanet surveys. With current data from Gaia's third data release (DR3), we are sensitive to periods from less than 1 yr to more than 4 yr but, unlike radial velocity (R.V.) are not as restricted by the orbital inclination of a potential planet. The presence and po…
Broad-line active galactic nuclei in the 6dF Galaxy Survey
Wolf, Christian; Hon, Wei Jeat; Webster, Rachel L.
The Six-degree Field Galaxy Survey (6dFGS) is a spectroscopic redshift survey of the Southern hemisphere completed in 2006. While it provides 136 304 spectra of mostly low-redshift galaxies, a large and reliable catalogue of active galactic nuclei (AGNs) that are selected based on spectral signatures is still lacking. In this work, we present an e…
Quasi-periodic eruptions as Lense-Thirring precession of super-Eddington flows
Pinto, C.; Miniutti, G.; Dauser, T. +9 more
Quasi-periodic eruptions (QPEs) are a recently identified class of X-ray transient associated with tidal disruption events by supermassive black holes, and for which there are multiple possible explanations. In this paper, we present a simple model which requires the black hole be spinning, be misaligned with the accretion flow (both conditions of…
Chemical Evolution of R-process Elements in Stars (CERES): III. Chemical abundances of neutron capture elements from Ba to Eu
Hansen, C. J.; Bonifacio, P.; Caffau, E. +11 more
Context. The chemical abundances of elements such as barium and the lanthanides are essential to understand the nucleosynthesis of heavy elements in the early Universe as well as the contribution of different neutron capture processes (for example slow versus rapid) at different epochs. Aims. The Chemical Evolution of R-process Elements in Stars (…
Accelerating lensed quasar discovery and modeling with physics-informed variational autoencoders
Grillo, Claudio; Suyu, Sherry H.; Andika, Irham T. +5 more
Strongly lensed quasars provide valuable insights into the rate of cosmic expansion, the distribution of dark matter in foreground deflectors, and the characteristics of quasar hosts. However, detecting them in astronomical images is difficult due to the prevalence of non-lensing objects. To address this challenge, we developed a generative deep l…