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A Comparison of the Stellar, CO, and Dust-continuum Emission from Three Star-forming HUDF Galaxies at z ∼ 2
Inami, Hanae; Smail, Ian; Neeleman, Marcel +17 more
We compare the extent of the dust, molecular gas, and stars in three star-forming galaxies, at z = 1.4, 1.6, and 2.7, selected from the Hubble Ultra Deep Field based on their bright carbon monoxide (CO) and dust-continuum emission as well as their large rest-frame optical sizes. The galaxies have high stellar masses, ${M}_{* }\gt {10}^{11}{M}_{\od…
The high-energy environment and atmospheric escape of the mini-Neptune K2-18 b
Udry, Stéphane; Pepe, Francesco; dos Santos, Leonardo A. +6 more
K2-18 b is a transiting mini-Neptune that orbits a nearby (38 pc), cool M3 dwarf and is located inside its region of temperate irradiation. We report on the search for hydrogen escape from the atmosphere K2-18 b using Lyman-α transit spectroscopy with the Space Telescope Imaging Spectrograph instrument installed on the Hubble Space Telescope. We a…
An ALMA Survey of λ Orionis Disks: From Supernovae to Planet Formation
Hacar, Alvaro; Ansdell, Megan; Facchini, Stefano +8 more
Protoplanetary disk surveys by the Atacama Large Millimeter/submillimeter Array (ALMA) are now probing a range of environmental conditions, from low-mass star-forming regions like Lupus to massive OB clusters like σ Orionis. Here we conduct an ALMA survey of protoplanetary disks in λ Orionis, an ∼5 Myr old OB cluster in Orion with dust mass sensit…
Asteroseismic Modeling of Gravity Modes in Slowly Rotating A/F Stars with Radiative Levitation
Dotter, Aaron; Aerts, Conny; Van Reeth, Timothy +3 more
It has been known for several decades that transport of chemical elements is induced by the process of microscopic atomic diffusion. Yet the effect of atomic diffusion, including radiative levitation, has hardly been studied in the context of gravity-mode pulsations of core hydrogen burning stars. In this paper we study the difference in the prope…
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…