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Exploring Galactic open clusters with Gaia: I. An examination in the first kiloparsec
Vieira, Katherine; García-Varela, Alejandro; Alfonso, Jeison
Context. Since the first publication of the Gαία catalogue, a new view of our Galaxy has arrived. Its astrometric and photometric information has improved the precision of the physical parameters of open star clusters obtained from them. Aims. Using the Gaia Data Release 3 (DR3) catalogue, our aim was to find physical stellar members including fai…
Constraining stellar tidal quality factors from planet-induced stellar spin-up
Chiappini, Cristina; Poppenhaeger, Katja; Ilić, Nikoleta +1 more
The dynamical evolution of tight star-planet systems is influenced by tidal interactions between the star and the planet, as was shown recently. The rate at which spins and orbits in such a system evolve depends on the stellar and planetary tidal dissipation efficiency. Here, we present a method to constrain the modified tidal quality factor Q
Galaxy spin direction asymmetry in JWST deep fields
Shamir, Lior
The unprecedented imaging power of James Webb Space Telescope (JWST) provides new abilities to observe the shapes of objects in the early Universe in a way that has not been possible before. Recently, JWST acquired a deep field image inside the same field imaged in the past as the Hubble Space Telescope (HST) Ultra Deep Field. Computer-based quant…
Hydrodynamic simulation of Cygnus OB2: the absence of a cluster wind termination shock
Sander, A. A. C.; Ramachandran, V.; Larkin, C. J. K. +3 more
We perform a large-scale hydrodynamic simulation of a massive star cluster whose stellar population mimics that of the Cygnus OB2 association. The main-sequence stars are first simulated during 1.6 Myr, until a quasi-stationary state is reached. At this time, the three Wolf-Rayet stars observed in Cygnus OB2 are added to the simulation, which cont…
Precise characterisation of HD 15337 with CHEOPS: A laboratory for planet formation and evolution
Guterman, P.; Alonso, R.; Deleuil, M. +90 more
Context. The HD 15337 (TIC 120896927, TOI-402) system was observed by the Transiting Exoplanet Survey Satellite (TESS), revealing the presence of two short-period planets situated on opposite sides of the radius gap. This offers an excellent opportunity to study theories of formation and evolution, as well as to investigate internal composition an…
Post-new-horizons Orbits and Masses for the Satellites of Pluto
Jacobson, Robert A.; Brozović, Marina
We report on ephemerides for the satellites of Pluto based on the large set of astrometric measurements. Our orbit fit yielded the following masses with 1σ uncertainties: GM Pluto = 869.3 ± 0.4 km3 s‑2, GM Charon = 106.1 ± 0.3 km3 s‑2, GM Nix = 1.50 ± 0.52 × 10‑3
Dependence of Virial Factors on Optical Spectral Properties of Active Galactic Nuclei
Du, Pu; Wang, Jian-Min; Yang, Sen
Reverberation mapping (RM) has long been a powerful tool for measuring the masses of supermassive black holes (SMBHs) at the centers of active galactic nuclei (AGNs), but the precision of these mass measurements depends on the so-called virial factors. It has been demonstrated that the virial factors exhibit significant diversity, spanning approxi…
The Companion Mass Distribution of Post Common Envelope Hot Subdwarf Binaries: Evidence for Boosted and Disrupted Magnetic Braking?
El-Badry, Kareem; Nagarajan, Pranav; van Roestel, Jan +6 more
We measure the mass distribution of main-sequence (MS) companions to hot subdwarf B stars (sdBs) in post-common envelope binaries (PCEBs). We carried out a spectroscopic survey of 14 eclipsing systems ("HW Vir binaries") with orbital periods of 3.8 < Porb < 12 hr, resulting in a well-understood selection function and a near-comple…
Stellar angular momentum of intermediate-redshift galaxies in MUSE surveys
Krajnović, D.; Contini, T.; Pessa, I. +8 more
We quantify the stellar rotation of galaxies by computing the λR parameter, a proxy for the stellar angular momentum in a sample of 106 intermediate-redshift galaxies (0.1 < z < 0.8). The sample is located in the CANDELS/GOODS-S and CANDELS/COSMOS regions, and it was observed by various MUSE surveys. We created spatially resolved …
Spectroscopic triples and a chance alignment: a solution for the problem of suspicious mass ratios for SB2s from Wilson method
Han, Zhanwen; Kovalev, Mikhail; Chen, Xuefei
We selected three double-lined spectroscopic binary systems which have extreme mass ratios, if measured using the Wilson method. We analysed medium resolution spectroscopic observations and space-based photometry and find that all these systems are not SB2, but rather triple systems and a chance alignment of another star with SB1 that have an unse…