Search Publications
A Blueprint for the Milky Way's Stellar Populations. IV. A String of Pearls-the Galactic Starburst Sequence
Beers, Timothy C.; Lee, Young Sun; Masseron, Thomas +1 more
We continue our series of papers on phase-space distributions of stars in the Milky Way based on photometrically derived metallicities and Gaia astrometry, with a focus on the halo-disk interface in the local volume. To exploit various photometric databases, we develop a method of empirically calibrating synthetic stellar spectra based on a compar…
The rapidly spinning intermediate-mass black hole 3XMM J150052.0+015452
Jonker, P. G.; Zabludoff, A. I.; Stone, N. C. +2 more
A star tidally disrupted by a black hole can form an accretion disc with a super-Eddington mass accretion rate; the X-ray emission produced by the inner disc provides constraints on the black hole mass M• and dimensionless spin parameter a•. Previous studies have suggested that the M• responsible for the tidal disr…
Stellar-mass black holes in the Hyades star cluster?
Wang, L.; Anders, F.; Gieles, M. +3 more
Astrophysical models of binary-black hole mergers in the universe require a significant fraction of stellar-mass black holes (BHs) to receive negligible natal kicks to explain the gravitational wave detections. This implies that BHs should be retained even in open clusters with low escape velocities (≲1 km s-1). We search for signatures…
TOI-4562b: A Highly Eccentric Temperate Jupiter Analog Orbiting a Young Field Star
Hellier, Coel; Rampalli, Rayna; Latham, David W. +47 more
We report the discovery of TOI-4562b (TIC-349576261), a Jovian planet orbiting a young F7V-type star, younger than the Praesepe/Hyades clusters (<700 Myr). This planet stands out because of its unusually long orbital period for transiting planets with known masses (P orb = 225.11781 ${}_{-0.00022}^{+0.00025}$ days) and because it has…
Searching for the extra-tidal stars of globular clusters using high-dimensional analysis and a core particle spray code
Speagle, Joshua S.; Webb, Jeremy J.; Leigh, Nathan W. C. +2 more
Three-body interactions can eject stars from the core of a globular cluster, causing them to enter the Galactic halo as extra-tidal stars. While finding extra-tidal stars is imperative for understanding cluster evolution, connecting isolated extra-tidal field stars back to their birth cluster is extremely difficult. In this work, we present a new …
Blind Search of the Solar Neighborhood Galactic Disk within 5 kpc: 1179 New Star Clusters Found in Gaia DR3
Wang, Wenting; Wang, Feng; Deng, Hui +2 more
Studying open clusters (OCs) may help to provide a comprehensive understanding of the structure and evolution of the Milky Way. Many previous studies have systematically searched for OCs near the solar system within 1.2 kpc or 20° of Galactic latitude. However, few studies have searched for OCs at higher Galactic latitudes and deeper distances. In…
The shared evaporation history of three sub-Neptunes spanning the radius-period valley of a hyades star
Fernández Fernández, Jorge; Wheatley, Peter J.; King, George W.
We model the evaporation histories of the three planets around K2-136, a K-dwarf in the Hyades open cluster with an age of 700 Myr. The star hosts three transiting planets, with radii of 1.0, 3.0, and 1.5 Earth radii, where the middle planet lies above the radius-period valley and the inner and outer planets are below. We use an XMM-Newton observa…
Searching for Milky Way twins: Radial abundance distribution as a strict criterion
Tautvaišienė, G.; Lara-López, M. A.; Pilyugin, L. S.
We search for Milky Way-like galaxies among a sample of approximately 500 galaxies. The characteristics we considered of the candidate galaxies are the following: stellar mass M⋆, optical radius R25, rotation velocity Vrot, central oxygen abundance (O/H)0, and abundance at the optical radius (O/H)R<…
The X-ray view of optically selected dual AGN
Komossa, S.; Guainazzi, Matteo; Paragi, Zsolt +12 more
We present a study of optically selected dual Active Galactic Nuclei (AGN) with projected separations of 3-97 kpc. Using multiwavelength (MWL) information (optical, X-ray, mid-IR), we characterized the intrinsic nuclear properties of this sample and compared them with those of isolated systems. Among the 124 X-ray-detected AGN candidates, 52 appea…
The metallicity distribution in the core of the Sagittarius dwarf spheroidal: Minimising the metallicity biases
Dalessandro, Emanuele; Mucciarelli, Alessio; Ibata, Rodrigo +7 more
We present the metallicity and radial velocity for 450 bona fide members of the Sagittarius dwarf spheroidal (Sgr dSph) galaxy, measured from high-resolution spectra (R ≃ 18 000) obtained with FLAMES at the VLT. The targets were carefully selected (a) to sample the core of the main body of Sgr dSph while avoiding contamination from the central ste…