Search Publications
A Runaway Giant in the Galactic Halo
Massey, Philip; Morrell, Nidia; Neugent, Kathryn F. +3 more
New evidence provided by the Gaia satellite places the location of the runaway star J01020100-7122208 in the halo of the Milky Way (MW) rather than in the Small Magellanic Cloud (SMC) as previously thought. We conduct a reanalysis of the star’s physical and kinematic properties, which indicates that the star may be an even more extraordinary find …
A 2 R ⊕ Planet Orbiting the Bright Nearby K Dwarf Wolf 503
Henning, Thomas; Latham, David W.; Schlieder, Joshua E. +21 more
Since its launch in 2009, the Kepler telescope has found thousands of planets with radii between that of Earth and Neptune. Recent studies of the distribution of these planets have revealed a gap in the population near 1.5-2.0 R ⊕, informally dividing these planets into “super-Earths” and “sub-Neptunes.” The origin of this division is d…
Link between the VLBI and Gaia Reference Frames
Liu, N.; Zhu, Z.; Liu, J. -C.
The link between the International Celestial Reference Frame at radio wavelength and the forthcoming Gaia optical reference frame is a mandatory task after the completion of the Gaia mission. Starting from the provisional reference frame in which Gaia astrometric solutions were obtained, we discuss the ways to correct the residual rotation and acc…
Deep CFHT Y-band Imaging of VVDS-F22 Field. II. Quasar Selection and Quasar Luminosity Function
Fan, Xiaohui; McGreer, Ian D.; Yang, Jinyi +7 more
We report the results of a faint quasar survey in a one-square-degree field. The aim is to test the Y-K/g-z and J-K/i-Y color selection criteria for quasars at faint magnitudes to obtain a complete sample of quasars based on deep optical and near-infrared color-color selection and to measure the faint end of the quasar luminosity function (QLF) ov…
A Comparison of Young Star Properties with Local Galactic Environment for LEGUS/LITTLE THINGS Dwarf Irregular Galaxies
Grebel, Eva K.; Smith, Linda J.; Aloisi, Alessandra +25 more
We have explored the role environmental factors play in determining characteristics of young stellar objects in nearby dwarf irregular and blue compact dwarf galaxies. Star clusters are characterized by concentrations, masses, and formation rates; OB associations by mass and mass surface density; O stars by their numbers and near-ultraviolet absol…
An Optical Study of Two VY Sculptoris-type Cataclysmic Binary Stars: V704 And and RX J2338+431
Thorstensen, John R.; Haberl, Frank; Weil, Kathryn E.
We report observations of the known cataclysmic variable star (CV) V704 And, and also confirm that the optical counterpart of the ROSAT Galactic Plane Survey source RX J2338+431 is a heretofore-neglected CV. Photometric and spectroscopic observations from MDM Observatory show both systems to be nova-like variables that exhibit dips of 4-5 mag from…
Detecting Variability in Massive Astronomical Time-series Data. III. Variable Candidates in the SuperWASP DR1 Found by Multiple Clustering Algorithms and a Consensus Clustering Method
Chang, Seo-Won; Kim, Dae-Won; Kim, Myung-Jin +3 more
We determine candidate variable sources in the SuperWASP Data Release 1 (DR1) using multiple clustering methods and identifying variable candidates as outliers from large clusters. We extract 15,788,814 light curves that have more than 15 photometric measurements in the SuperWASP DR1. Variations in the light curves are described in terms of nine v…
HATS-59b,c: A Transiting Hot Jupiter and a Cold Massive Giant Planet around a Sun-like Star
Arriagada, P.; Butler, R. P.; Crane, J. D. +27 more
We report the first discovery of a multi-planetary system by the HATSouth network, HATS-59b,c, a planetary system with an inner transiting hot Jupiter and an outer cold massive giant planet, which was detected via radial velocity. The inner transiting planet, HATS-59b, is on an eccentric orbit with e=0.129+/- 0.049, orbiting a V=13.951+/- 0.030 ma…
On the M V -Inclination Relationship for Nova-like Variables
Howell, Steve B.; Mason, Elena
Using a sample of Nova-like stars from the Ritter & Kolb catalog, we examine the relationship between their Gaia-determined absolute magnitude and the inclination of the binary system. Webbink et al. derived a relationship between these two variables that provides a good fit and allows differentiation between \dot{M} (and possibly M WD
A Phenomenological Model for the Light Curve of Three Quiescent Low-inclination Dwarf Novae and One Pre-cataclysmic Variable
Szkody, Paula; Garnavich, Peter M.; Su, Jie +5 more
We used the light curve code XRBinary to model the quiescent K2 light curves of three low-inclination cataclysmic variables (CVs): 1RXS J0632+2536 (J0632+2536), RZ Leo, TW Vir and the pre-CV WD 1144+011. Optimized light curve models were obtained using a nonlinear fitting code NMfit and visualized by Phoebe 2.0. The disk model of J0632+2536 shows …