Search Publications
Wind properties of Milky Way and SMC massive stars: empirical Z dependence from CMFGEN models
Bouret, J. -C.; Vink, J. S.; Bernini-Peron, M. +2 more
Detailed knowledge about stellar winds and evolution at different metallicities is crucial for understanding stellar populations and feedback in the Local Group of galaxies and beyond. Despite efforts in the literature, we still lack a comprehensive, empirical view of the dependence of wind properties on metallicity (Z). Here, we investigate the w…
A gravitational and dynamical framework of star formation: the Orion nebula
Stassun, Keivan G.; Kounkel, Marina; Hartmann, Lee +1 more
The Orion Nebula Cluster (ONC) is the most massive region of active star formation within a kpc of the Sun. Using Gaia DR3 parallaxes and proper motions, we examine the bulk motions of stars radially and tangentially relative to the cluster centre. We find an age gradient with distance to the stars in the ONC, from 385 pc for the oldest stars, to …
The signature of large-scale turbulence driving on the structure of the interstellar medium
Robitaille, Jean-François; Glover, Simon C. O.; Klessen, Ralf S. +9 more
The mechanisms that maintain turbulence in the interstellar medium (ISM) are still not identified. This work investigates how we can distinguish between two fundamental driving mechanisms: the accumulated effect of stellar feedback versus the energy injection from galactic scales. We perform a series of numerical simulations describing a stratifie…
Probing the Galactic halo with RR Lyrae stars - II. The substructures of the Milky Way
Huang, Y.; Zhang, H. -W.; Zhang, L. +4 more
We identify substructures of the Galactic halo using 3003 type ab RR Lyrae stars with six-dimensional position-velocity information from the Sloan Digital Sky Survey, the Large Sky Area Multi-Object Fiber Spectroscopic Telescope and the Gaia Early Data Release 3. Based on this information, we define the separation of any two of the stars in the in…
The MBHBM⋆ Project - II. Molecular gas kinematics in the lenticular galaxy NGC 3593 reveal a supermassive black hole
Baba, Shunsuke; Imanishi, Masatoshi; Neumayer, Nadine +15 more
As part of the Measuring Black Holes in below Milky Way-mass (M⋆) galaxies (MBHBM⋆) Project, we present a dynamical measurement of the supermassive black hole (SMBH) mass in the nearby lenticular galaxy NGC 3593, using cold molecular gas 12CO(2-1) emission observed at an angular resolution of ≈0${_{.}^{\prime\prime…
Validation of TESS exoplanet candidates orbiting solar analogues in the all-sky PLATO input catalogue
Piotto, Giampaolo; Wilson, Thomas G.; Collier Cameron, Andrew +6 more
The Transiting Exoplanet Survey Satellite (TESS) is focusing on relatively bright stars and has found thousands of planet candidates. However, mainly because of the low spatial resolution of its cameras (≈ 21 arcsec/pixel), TESS is expected to detect several false positives (FPs); hence, vetting needs to be done. Here, we present a follow-up progr…
Energetic transients joint analysis system for multi-INstrument (ETJASMIN) for GECAM - I. Positional, temporal, and spectral analyses
Gao, Min; Gong, Ke; Qiao, Rui +67 more
Gravitational wave high-energy Electromagnetic Counterpart All-sky Monitor (GECAM) is a dedicated mission, launched in December 2020, for gamma-ray transients, including gamma-ray bursts (GRBs) and soft gamma repeater (SGR) bursts in the multimessenger and multiwavelength astronomy era. Since GECAM consists of two independent spacecrafts (or say i…
Probable dormant neutron star in a short-period binary system
Maoz, Dan; Latham, David W.; Liu, Jifeng +24 more
We have identified 2XMM J125556.57+565846.4, at a distance of 600 pc, as a binary system consisting of a normal star and a probable dormant neutron star. Optical spectra exhibit a slightly evolved F-type single star, displaying periodic Doppler shifts with a 2.76-d Keplerian circular orbit, with no indication of light from a secondary component. O…
Pulsating B stars in the Scorpius-Centaurus Association with TESS
Bedding, Timothy R.; White, Timothy R.; Saio, Hideyuki +1 more
We study 119 B stars located in the Scorpius-Centaurus Association using data from NASA's TESS Mission. We see pulsations in 81 stars (68 per cent) across the full range of effective temperatures. In particular, we confirm previous reports of low-frequency pulsations in stars whose temperatures fall between the instability strips of SPB stars (slo…
An extended stellar halo discovered in the Fornax dwarf spheroidal using Gaia EDR3
Hammer, François; Pawlowski, Marcel S.; Yang, Yanbin +1 more
We have studied the extent of the Red Giant Branch stellar population in the Fornax dwarf spheroidal galaxy using the spatially extended and homogeneous data set from Gaia EDR3. Our pre-selection of stars belonging to Fornax is based on their proper motions, parallaxes, and colour-magnitude diagram. The latter criteria provide a Fornax star sample…