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The brightening of the pulsar wind nebula of PSR B0540-69 after its spin-down-rate transition
Wang, Q. D.; Zhang, S. N.; Ge, M. Y. +6 more
It is believed that an isolated pulsar loses its rotational energy mainly through a relativistic wind consisting of electrons, positrons and possibly Poynting flux1-3. As it expands, this wind may eventually be terminated by a shock, where particles can be accelerated to energies of X-ray synchrotron emission, and a pulsar wind nebula (…
Estimating stellar ages and metallicities from parallaxes and broadband photometry: successes and shortcomings
Feltzing, Sofia; Howes, Louise M.; Lindegren, Lennart +2 more
A deep understanding of the Milky Way galaxy, its formation and evolution requires observations of huge numbers of stars. Stellar photometry, therefore, provides an economical method to obtain intrinsic stellar parameters. With the addition of distance information - a prospect made real for more than a billion stars with the second Gaia data relea…
The orbital anisotropy profiles of nearby globular clusters from Gaia Data Release 2
Bovy, Jo; Webb, Jeremy J.; Jindal, Abhinav
Gaia Data Release 2 provides a wealth of data to study the internal structure of nearby globular clusters (GCs). We use this data to investigate the internal kinematics of 10 nearby GCs, with a particular focus on their poorly studied outer regions. We apply a strict set of selection criteria to remove contaminating sources and create pure cluster…
Testing Shear Recovery with Field Distortion
Zhang, Jun; Li, Xiangchong; Luo, Wentao +7 more
The tilt, rotation, or offset of each CCD with respect to the focal plane, as well as the distortion of the focal plane itself, causes shape distortions in the observed objects, an effect typically known as field distortion (FD). We point out that FD provides a unique way of quantifying the accuracy of cosmic shear measurement. The idea is to stac…
The Effect of Binarity on Circumstellar Disk Evolution
Hinkley, Sasha; Rizzuto, Aaron C.; Kraus, Adam L. +6 more
We present new results on how the presence of stellar companions affects disk evolution based on a study of the 5-11 Myr old Upper Scorpius OB Association. Of the 50 G0-M3 Upper Sco members with disks in our sample, only seven host a stellar companion within 2″ and brighter than K = 15, compared to 35 of 75 members without disks. This matches a tr…
A machine learning classifier for microlensing in wide-field surveys
Bachelet, E.; Street, R. A.; Narayan, G. +1 more
While microlensing is very rare, occurring on average once per million stars observed, current and near-future surveys are coming online with the capability of providing photometry of almost the entire visible sky to depths up to R ∼22 mag or fainter every few days, which will contribute to the detection of black holes and exoplanets through follo…
CHO-Bearing Molecules in Comet 67P/Churyumov-Gerasimenko
De Keyser, Johan; Gombosi, Tamas I.; Berthelier, Jean-Jacques +10 more
In 2004, the Rosetta spacecraft was sent to comet 67P/Churyumov-Gerasimenko for the first ever long-term investigation of a comet. After its arrival in 2014, the spacecraft spent more than two years in immediate proximity to the comet. During these two years, the ROSINA Double Focusing Mass Spectrometer (DFMS) onboard Rosetta discovered a coma wit…
Consistent dust and gas models for protoplanetary disks. IV. A panchromatic view of protoplanetary disks
Waters, L. B. F. M.; Pinte, C.; Ménard, F. +17 more
Context. Consistent modeling of protoplanetary disks requires the simultaneous solution of both continuum and line radiative transfer, heating and cooling balance between dust and gas and, of course, chemistry. Such models depend on panchromatic observations that can provide a complete description of the physical and chemical properties and energy…
Detecting dark matter cores in galaxy clusters with strong lensing
Andrade, Kevin E.; Minor, Quinn; Kaplinghat, Manoj +1 more
We test the ability of strong lensing data to constrain the size of a central core in the dark matter haloes of galaxy clusters, using Abell 611 as a prototype. Using simulated data, we show that modelling a cluster halo with ellipticity in the gravitational potential can bias the inferred mass and concentration, which may bias the inferred centra…
Probing the Gas Content of Late-stage Protoplanetary Disks with N2H+
Zhang, Ke; Bergin, Edwin A.; Huang, Jane +5 more
The lifetime of gas in circumstellar disks is a fundamental quantity that informs our understanding of planet formation. Studying disk gas evolution requires measurements of disk masses around stars of various ages. Because H2 gas is unobservable under most disk conditions, total disk masses are based on indirect tracers such as sub-mm …