Search Publications
WFIRST Exoplanet Mass-measurement Method Finds a Planetary Mass of 39 ± 8 M ⊕ for OGLE-2012-BLG-0950Lb
Bennett, D. P.; Udalski, A.; Anderson, J. +13 more
We present the analysis of the simultaneous high-resolution images from the Hubble Space Telescope and Keck adaptive optics system of the planetary event OGLE-2012-BLG-0950 that determine that the system consists of a 0.58 ± 0.04 {M}⊙ host star orbited by a 39 ± 8 {M}\oplus planet at a projected separation of 2.54 ± 0.23 au…
X-UDS: The Chandra Legacy Survey of the UKIDSS Ultra Deep Survey Field
Papovich, Casey; Kocevski, Dale D.; Koekemoer, Anton M. +25 more
We present the X-UDS survey, a set of wide and deep Chandra observations of the Subaru-XMM Deep/UKIDSS Ultra Deep Survey (SXDS/UDS) field. The survey consists of 25 observations that cover a total area of 0.33 deg2. The observations are combined to provide a nominal depth of ∼600 ks in the central 100 arcmin2 region of the fi…
Fornax3D project: Overall goals, galaxy sample, MUSE data analysis, and initial results
de Zeeuw, P. T.; McDermid, R. M.; Falcón-Barroso, J. +10 more
The Fornax cluster provides a uniquely compact laboratory in which to study the detailed history of early-type galaxies and the role played by the environment in driving their evolution and their transformation from late-type galaxies. Using the superb capabilities of the Multi Unit Spectroscopic Explorer on the Very Large Telescope, high-quality …
The origin of interstellar asteroidal objects like 1I/2017 U1 `Oumuamua
Torres, Santiago; Portegies Zwart, Simon; Bédorf, Jeroen +2 more
We study the origin of the interstellar object 1I/2017 U1 `Oumuamua by juxtaposing estimates based on the observations with simulations. We speculate that objects like `Oumuamua are formed in the debris disc as left over from the star and planet formation process, and subsequently liberated. The liberation process is mediated either by interaction…
Compressible Magnetohydrodynamic Turbulence in the Earth's Magnetosheath: Estimation of the Energy Cascade Rate Using in situ Spacecraft Data
Sahraoui, F.; Huang, S. Y.; Hadid, L. Z. +1 more
The first estimation of the energy cascade rate |ɛC| of magnetosheath turbulence is obtained using the Cluster and THEMIS spacecraft data and an exact law of compressible isothermal magnetohydrodynamics turbulence. The mean value of |ɛC| is found to be close to 10-13 J m-3 s-1 , at least 2 ord…
Time-resolved WISE/NEOWISE Coadds
Lang, D.; Meisner, A. M.; Schlegel, D. J.
We have used the first ∼3 years of 3.4 µm (W1) and 4.6 µm (W2) observations from the WISE and NEOWISE missions to create a full-sky set of time-resolved coadds. As a result of the WISE survey strategy, a typical sky location is visited every six months and is observed during ≳12 exposures per visit, with these exposures spanning a ∼1 d…
Structure of photodissociation fronts in star-forming regions revealed by Herschel observations of high-J CO emission lines
Le Bourlot, J.; Le Petit, F.; Pinto, C. +17 more
Context. In bright photodissociation regions (PDR) associated with massive star formation, the presence of dense "clumps" that are immersed in a less dense interclump medium is often proposed to explain the difficulty of models to account for the observed gas emission in high-excitation lines.
Aims: We aim to present a comprehensive view of t…
Retrieval of exoplanet emission spectra with HyDRA
Madhusudhan, Nikku; Gandhi, Siddharth
Thermal emission spectra of exoplanets provide constraints on the chemical compositions, pressure-temperature (P-T) profiles, and energy transport in exoplanetary atmospheres. Accurate inferences of these properties rely on the robustness of the atmospheric retrieval methods employed. While extant retrieval codes have provided significant constrai…
MIKiS: The Multi-instrument Kinematic Survey of Galactic Globular Clusters. I. Velocity Dispersion Profiles and Rotation Signals of 11 Globular Clusters
Dalessandro, E.; Valenti, E.; Bellazzini, M. +10 more
We present the first results of the Multi-Instrument Kinematic Survey of Galactic Globular Clusters (GGCs), a project aimed at exploring the internal kinematics of a representative sample of GGCs from the radial velocity of individual stars, covering the entire radial extension of each system. This is achieved by exploiting the formidable combinat…
Fourteen candidate RR Lyrae star streams in the inner Galaxy
Kawata, Daisuke; Mateu, Cecilia; Read, Justin I.
We apply the GC3 stream-finding method to RR Lyrae stars (RRLSs) in the Catalina survey. We find 2 RRLS stream candidates at >4σ confidence and another 12 at >3.5σ confidence over the Galactocentric distance range 4 < D/kpc < 26. Of these, only two are associated with known globular clusters (NGC 1261 and Arp2). The remainder are candi…