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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…
Quasars as standard candles. IV. Analysis of the X-ray and UV indicators of the disc-corona relation
Signorini, Matilde; Risaliti, Guido; Lusso, Elisabeta +4 more
Context. A non-linear relation between quasar monochromatic luminosities at 2500 Å and 2 keV holds at all observed redshifts and luminosities, and it has been used to derive quasar distances and to build a Hubble diagram of quasars. The choice of the X-ray and UV indicators has so far been somewhat arbitrary and has typically relied on photometric…
Deep drilling in the time domain with DECam: survey characterization
Clarkson, William I.; Lee, Chien-Hsiu; Rest, Armin +41 more
This paper presents a new optical imaging survey of four deep drilling fields (DDFs), two Galactic and two extragalactic, with the Dark Energy Camera (DECam) on the 4-m Blanco telescope at the Cerro Tololo Inter-American Observatory (CTIO). During the first year of observations in 2021, >4000 images covering 21 deg2 (seven DECam poin…
An elusive dark central mass in the globular cluster M4
Anderson, Jay; Bedin, Luigi R.; Bellini, Andrea +4 more
Recent studies of nearby globular clusters have discovered excess dark mass in their cores, apparently in an extended distribution, and simulations indicate that this mass is composed mostly of white dwarfs (respectively stellar-mass black holes) in clusters that are core collapsed (respectively with a flatter core). We perform mass-anisotropy mod…