Search Publications
Measuring the masses of magnetic white dwarfs: a NuSTAR legacy survey
Mukai, K.; Heinke, C. O.; Gandhi, P. +11 more
The hard X-ray spectrum of magnetic cataclysmic variables can be modelled to provide a measurement of white dwarf mass. This method is complementary to radial velocity measurements, which depend on the (typically rather uncertain) binary inclination. Here, we present results from a Legacy Survey of 19 magnetic cataclysmic variables with NuSTAR. We…
PSR J1012+5307: a millisecond pulsar with an extremely low-mass white dwarf companion
van Kerkwijk, M. H.; Breton, R. P.; Mata Sánchez, D. +2 more
Binaries harbouring millisecond pulsars (MSPs) enable a unique path to determine neutron star (NS) masses: radio pulsations reveal the motion of the NS, while that of the companion can be characterized through studies in the optical range. PSR J1012+5307 is an MSP in a 14.5-h orbit with a helium-core white dwarf (WD) companion. In this work we pre…
Mapping the Galactic Disk with the LAMOST and Gaia Red Clump Sample. V. On the Origin of the "Young" [α/Fe]-enhanced Stars
Wang, H. -F.; Huang, Y.; Chen, B. -Q. +8 more
Using a sample of nearly 140,000 primary red-clump stars selected from the LAMOST and Gaia surveys, we have identified a large sample of "young" [α/Fe]-enhanced stars with stellar ages younger than 6.0 Gyr and [α/Fe] ratios greater than 0.15 dex. The stellar ages and [α/Fe] ratios are measured from LAMOST spectra, using a machine-learning method t…
A Survey for New Stars and Brown Dwarfs in the Ophiuchus Star-forming Complex
Luhman, K. L.; Esplin, T. L.
We have performed a survey for new members of the Ophiuchus cloud complex using high-precision astrometry from the second data release of Gaia, proper motions measured with multi-epoch images from the Spitzer Space Telescope, and color-magnitude diagrams constructed with photometry from various sources. Through spectroscopy of candidates selected …
GOODS-ALMA: Optically dark ALMA galaxies shed light on a cluster in formation at z = 3.5
Magnelli, B.; Daddi, E.; Elbaz, D. +30 more
Thanks to its outstanding angular resolution, the Atacama Large Millimeter/submillimeter Array (ALMA) has recently unambiguously identified a population of optically dark galaxies with redshifts greater than z = 3, which play an important role in the cosmic star formation in massive galaxies. In this paper we study the properties of the six optica…
Jeans modelling of the Milky Way's nuclear stellar disc
Mastrobuono-Battisti, Alessandra; Neumayer, Nadine; Klessen, Ralf S. +4 more
The nuclear stellar disc (NSD) is a flattened stellar structure that dominates the gravitational potential of the Milky Way at Galactocentric radii $30 \lesssim R \lesssim 300\, {\rm pc}$ . In this paper, we construct axisymmetric Jeans dynamical models of the NSD based on previous photometric studies and we fit them to line-of-sight kinematic dat…
A Warm Jupiter Transiting an M Dwarf: A TESS Single-transit Event Confirmed with the Habitable-zone Planet Finder
Cochran, William D.; Endl, Michael; Mahadevan, Suvrath +30 more
We confirm the planetary nature of a warm Jupiter transiting the early M dwarf TOI-1899 using a combination of available TESS photometry; high-precision, near-infrared spectroscopy with the Habitable-zone Planet Finder; and speckle and adaptive optics imaging. The data reveal a transiting companion on an ∼29 day orbit with a mass and radius of $0.…
A basin-free spherical shape as an outcome of a giant impact on asteroid Hygiea
Jorda, L.; Lamy, P.; Colas, F. +44 more
(10) Hygiea is the fourth largest main belt asteroid and the only known asteroid whose surface composition appears similar to that of the dwarf planet (1) Ceres1,2, suggesting a similar origin for these two objects. Hygiea suffered a giant impact more than 2 Gyr ago3 that is at the origin of one of the largest asteroid famili…
Properties of flares and CMEs on EV Lac: possible erupting filament
Guenther, E. W.; Muheki, Priscilla; Mutabazi, T. +1 more
Flares and coronal mass ejections (CMEs) are very powerful events in which energetic radiation and particles are ejected within a short time. These events thus can strongly affect planets that orbit these stars. This is particularly relevant for planets of M-stars, because these stars stay active for a long time during their evolution and yet pote…
An eclipsing substellar binary in a young triple system discovered by SPECULOOS
Kunovac Hodžić, Vedad; Triaud, Amaury H. M. J.; Burgasser, Adam J. +18 more
Mass, radius and age are three of the most fundamental parameters for celestial objects, enabling insight into the evolution and internal physics of stars, brown dwarfs and planets. Brown dwarfs are hydrogen-rich objects that are unable to sustain core fusion reactions but are supported against collapse by electron degeneracy pressure1.…