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There is no place like home - finding birth radii of stars in the Milky Way
Steinmetz, Matthias; Buck, Tobias; Freeman, Ken C. +6 more
Stars move away from their birthplaces over time via a process known as radial migration, which blurs chemo-kinematic relations used for reconstructing the Milky Way (MW) formation history. To understand the true time evolution of the MW, one needs to take into account the effects of this process. We show that stellar birth radii can be derived di…
The Sonora Substellar Atmosphere Models. IV. Elf Owl: Atmospheric Mixing and Chemical Disequilibrium with Varying Metallicity and C/O Ratios
Fortney, Jonathan J.; Batalha, Natasha E.; Marley, Mark S. +7 more
Disequilibrium chemistry due to vertical mixing in the atmospheres of many brown dwarfs and giant exoplanets is well established. Atmosphere models for these objects typically parameterize mixing with the highly uncertain K zz diffusion parameter. The role of mixing in altering the abundances of C-N-O-bearing molecules has mostly been…
The 40 pc sample of white dwarfs from Gaia
Gänsicke, B. T.; Tremblay, P. -E.; Hollands, M. A. +14 more
We present a comprehensive overview of a volume-complete sample of white dwarfs located within 40 pc of the Sun, a significant proportion of which were detected in Gaia Data Release 3 (DR3). Our DR3 sample contains 1076 spectroscopically confirmed white dwarfs, with just five candidates within the volume remaining unconfirmed (> 99 per cent spe…
Charting the Galactic Acceleration Field. II. A Global Mass Model of the Milky Way from the STREAMFINDER Atlas of Stellar Streams Detected in Gaia DR3
Bianchini, Paolo; Malhan, Khyati; Martin, Nicolas F. +17 more
We present an atlas and follow-up spectroscopic observations of 87 thin stream-like structures detected with the STREAMFINDER algorithm in Gaia DR3, of which 28 are new discoveries. Here, we focus on using these streams to refine mass models of the Galaxy. Fits with a double-power-law halo with the outer power-law slope set to ‑β h = …
Strong constraints on the gravitational law from Gaia DR3 wide binaries
Mieske, Steffen; Famaey, Benoit; Ibata, Rodrigo +4 more
We test Milgromian dynamics (MOND) using wide binary stars (WBs) with separations of 2-30 kAU. Locally, the WB orbital velocity in MOND should exceed the Newtonian prediction by $\approx 20~{{\ \rm per\ cent}}$ at asymptotically large separations given the Galactic external field effect (EFE). We investigate this with a detailed statistical analys…
GA-NIFS: The core of an extremely massive protocluster at the epoch of reionisation probed with JWST/NIRSpec
Pérez-González, Pablo G.; Charlot, Stéphane; Chevallard, Jacopo +24 more
Context. The SPT0311-58 system resides in a massive dark-matter halo at z ∼ 6.9. It hosts two dusty galaxies (E and W) with a combined star formation rate (SFR) of ∼3500 M⊙ yr−1, mostly obscured and identified by the rest-frame IR emission. The surrounding field exhibits an overdensity of submillimetre sources, making it a ca…
Fundamental scaling relationships revealed in the optical light curves of tidal disruption events
Ingram, Adam; van Velzen, Sjoert; Hammerstein, Erica +4 more
We present fundamental scaling relationships between properties of the optical/UV light curves of tidal disruption events (TDEs) and the mass of the black hole that disrupted the star. We have uncovered these relations from the late-time emission of TDEs. Using a sample of 63 optically selected TDEs, the latest catalogue to date, we observed flatt…
Quaia, the Gaia-unWISE Quasar Catalog: An All-sky Spectroscopic Quasar Sample
Hogg, David W.; Rix, Hans-Walter; Eilers, Anna-Christina +4 more
We present a new, all-sky quasar catalog, Quaia, that samples the largest comoving volume of any existing spectroscopic quasar sample. The catalog draws on the 6,649,162 quasar candidates identified by the Gaia mission that have redshift estimates from the space observatory's low-resolution blue photometer/red photometer spectra. This initial samp…
Identification of a transition from stochastic to secular star formation around z = 9 with JWST
Magnelli, B.; Daddi, E.; Elbaz, D. +6 more
Star formation histories (SFHs) of early galaxies (6 < z < 12) have been found to be highly stochastic in both simulations and observations, while at z≲6 the presence of a main sequence (MS) of star-forming galaxies implies secular processes at play. In this work we characterise the SFH variability of early galaxies as a function of their st…
Chasing the impact of the Gaia-Sausage-Enceladus merger on the formation of the Milky Way thick disc
Ting, Yuan-Sen; Grand, Robert J. J.; Fragkoudi, Francesca +8 more
We employ our Bayesian Machine Learning framework BINGO (Bayesian INference for Galactic archaeOlogy) to obtain high-quality stellar age estimates for 68 360 red giant and red clump stars present in the 17th data release of the Sloan Digital Sky Survey, the APOGEE-2 high-resolution spectroscopic survey. By examining the denoised age-met…