Search Publications
Identifying LISA verification binaries among the Galactic population of double white dwarfs
Korol, Valeriya; Moore, Christopher J.; Vecchio, Alberto +7 more
Double white dwarfs (DWDs) will be the most numerous gravitational-wave (GW) sources for the Laser Interferometer Space Antenna (LISA). Most of the Galactic DWDs will be unresolved and will superpose to form a confusion noise foreground, the dominant LISA noise source around ${\sim} 0.5\!-\!3\, \mathrm{mHz}$ . A small fraction of these sources wil…
MINDS. Abundant water and varying C/O across the disk of Sz 98 as seen by JWST/MIRI
Henning, Thomas; Östlin, Göran; Güdel, Manuel +41 more
Context. The Mid-InfraRed Instrument (MIRI) Medium Resolution Spectrometer (MRS) on board the James Webb Space Telescope (JWST) allows us to probe the inner regions of protoplanetary disks, where the elevated temperatures result in an active chemistry and where the gas composition may dictate the composition of planets forming in this region. The …
What if young z > 9 JWST galaxies hosted massive black holes?
Volonteri, Marta; Habouzit, Mélanie; Colpi, Monica
JWST is discovering star-forming 'candidate' galaxies with photometric redshifts z > 9 and little attenuation. We model presumptive massive black holes (MBHs) in such galaxies and find that their unobscured emission is fainter than the galaxy starlight in JWST filters, and difficult to be detected via colour-colour selection, and X-ray and radi…
Evidence for a bottom-light initial mass function in massive star clusters
Hénault-Brunet, V.; Baumgardt, H.; Sollima, A. +1 more
We have determined stellar mass functions of 120 Milky Way globular clusters and massive Large Magellanic Cloud/Small Magellanic Cloud star clusters based on a comparison of archival Hubble Space Telescope photometry with a large grid of direct N-body simulations. We find a strong correlation of the global mass function slopes of star clusters wit…
Confirmation and Keplerian motion of the gap-carving protoplanet HD 169142 b
Pinte, Christophe; Christiaens, Valentin; Price, Daniel J. +4 more
We present the re-detection of a compact source in the face-on protoplanetary disc surrounding HD 169142, using VLT/SPHERE data in YJH bands. The source is found at a separation of 0${_{.}^{\prime\prime}}$319 (~37 au) from the star. Three lines of evidence argue in favour of the signal tracing a protoplanet: (i) it is found in the annular gap sepa…
Gaia Data Release 3. Pulsations in main sequence OBAF-type stars
Prusti, T.; Mazeh, T.; Zucker, S. +445 more
Context. The third Gaia data release provides photometric time series covering 34 months for about 10 million stars. For many of those stars, a characterisation in Fourier space and their variability classification are also provided. This paper focuses on intermediate- to high-mass (IHM) main sequence pulsators (M ≥ 1.3 M⊙) of spectral …
The Effect of the LMC on the Milky Way System
Vasiliev, Eugene
We review the recent theoretical and observational developments concerning the interaction of the Large Magellanic Cloud (LMC) with the Milky Way and its neighbourhood. An emerging picture is that the LMC is a fairly massive companion (10–20% of the Milky Way mass) and just passed the pericentre of its orbit, likely for the first time. The gravita…
Early Results from GLASS-JWST. XXI. Rapid Asembly of a Galaxy at z = 6.23 Revealed by Its C/O Abundance
Santini, Paola; Pentericci, Laura; Treu, Tommaso +22 more
The abundance of carbon relative to oxygen (C/O) is a promising probe of star formation history in the early universe, as the ratio changes with time due to production of these elements by different nucleosynthesis pathways. We present a measurement of $\mathrm{log}({\rm{C}}/{\rm{O}})=-1.01\pm 0.12$ (stat) ±0.15 (sys) in a z = 6.23 galaxy observed…
TOI-1136 is a Young, Coplanar, Aligned Planetary System in a Pristine Resonant Chain
Terentev, Ivan A.; Batalha, Natalie M.; Bieryla, Allyson +60 more
Convergent disk migration has long been suspected to be responsible for forming planetary systems with a chain of mean-motion resonances (MMRs). Dynamical evolution over time could disrupt the delicate resonant configuration. We present TOI-1136, a 700 ± 150 Myr old G star hosting at least six transiting planets between ~2 and 5 R ⊕. Th…
Direct discovery of the inner exoplanet in the HD 206893 system. Evidence for deuterium burning in a planetary-mass companion
Lutz, D.; Genzel, R.; Sturm, E. +108 more
Aims: HD 206893 is a nearby debris disk star that hosts a previously identified brown dwarf companion with an orbital separation of ∼10 au. Long-term precise radial velocity (RV) monitoring, as well as anomalies in the system proper motion, has suggested the presence of an additional, inner companion in the system.
Methods: Using informa…