Search Publications
An Analysis of the Eclipsing Binaries HD 71636, V1022 Cassiopeiae, and OT Andromedae
Henry, Gregory W.; Fekel, Francis C.; Sowell, James R. +3 more
We have obtained high-dispersion spectroscopy and BV photometry of two F-type eclipsing binaries, HD 71636 and V1022 Cas, plus the A-type system OT And. Transiting Exoplanet Survey Satellite measurements for each system have also been incorporated. The photometry of HD 71636 enables a more consistent picture of this 5.01331 days, circular-orbit sy…
Locating Red Supergiants in the Galaxy NGC 6822
Massey, Philip; Levesque, Emily M.; Neugent, Kathryn F. +1 more
Using archival near-IR photometry, we identify 51 of the K-band brightest red supergiants (RSGs) in NGC 6822 and compare their physical properties with stellar evolutionary model predictions. We first use Gaia parallax and proper motion values to filter out foreground Galactic red dwarfs before constructing a J-K versus K color-magnitude diagram t…
OGLE-2014-BLG-0319: A Sub-Jupiter-mass Planetary Event Encountered Degeneracy with Different Mass Ratios and Lens-source Relative Proper Motions
Udalski, Andrzej; Mróz, Przemek; Skowron, Jan +37 more
We report the discovery of a sub-Jovian-mass planet, OGLE-2014-BLG-0319Lb. The characteristics of this planet will be added into a future extended statistical analysis of the Microlensing Observations in Astrophysics (MOA) collaboration. The planetary anomaly of the light curve is characterized by MOA and OGLE survey observations and results in th…
Mass Transfer as an Explanation for the Lifetime Travel Time Discrepancy in IT Librae
Orosz, Jerome; Shepard, Katherine; Wysocki, Peter +2 more
The eclipsing binary IT Librae is an unusual system of two B-type stars that is situated about 1 kpc above the Galactic plane. The binary was probably ejected from its birthplace in the disk, but the implied time of flight to its current location exceeds the evolutionary lifetime of the primary star. Here we present a study of new high-dispersion …
Dynamical Architecture of the HD 107148 Planetary System
Trifonov, Trifon; Stock, Stephan; Henning, Thomas +15 more
We present an independent Doppler validation and dynamical orbital analysis of the two-planet system HD 107148, which was recently announced in Rosenthal et al. Our detailed analyses are based on literature HIRES data and newly obtained HARPS and CARMENES radial-velocity (RV) measurements as part of our survey in search for additional planets arou…
A Taxonomy for the Configurations of Quadruply Lensed Quasars
Schechter, Paul L.
A simple, novice-friendly scheme for classifying the image configurations of quadruply lensed quasars is proposed. With only six classes, it is intentionally coarse grained. It focuses on the kitelikeness and circularity of these configurations, or the absence thereof. Other features are deliberately ignored, their importance to professional astro…
Recalculated Orbits Of Binaries and New Linear Solutions
Cvetković, Z.; Pavlović, R.
In this paper we present recalculated orbital elements for nine binaries: EGG 2Aa, Ab, COU 1085, COU 1897, COU 1006, A 578Aa, Ab, A 1400, A 606, BU 984, and BU 992. Seven binaries have orbital periods longer than 100 yr, and two binaries have shorter orbital periods, 38 and 76 yr. Also, we present linear solutions determined for three double stars…
Investigating 2M1155-79B: A Nearby, Young, Low-mass Star Actively Accreting from a Nearly Edge-on, Dusty Disk
Schneider, Adam C.; Gagné, Jonathan; Kastner, Joel H. +5 more
We investigate the nature of an unusually faint member of the ϵ Cha association (D ~ 100 pc, age ~5 Myr), the nearest region of star formation of age <8 Myr. This object, 2MASS J11550336-7919147 (2M1155-79B), is a wide-separation (~580 au), comoving companion to low-mass (M3) ϵ Cha association member 2MASS J11550485-7919108 (2M1155-79A). We pre…
Refining the Masses and Radii of the Star Kepler-33 and its Five Transiting Planets
Lissauer, Jack J.; Jontof-Hutter, Daniel; Sikora, James +1 more
Kepler-33 hosts five validated transiting planets ranging in period from 5 to 41 days. The planets are in nearly coplanar orbits and exhibit remarkably similar (appropriately scaled) transit durations indicative of similar impact parameters. The outer three planets have a radius of 3.5 ≲ R p/R ⊕ ≲ 4.7 and are closely packed d…
Satellite Galaxies' Drag on Field Stars in the Milky Way
Liu, Jifeng; Zhao, Jingkun; Liang, Xilong +1 more
With Gaia EDR3 data, velocity dispersion of Milky Way field stars around satellite galaxies has been investigated. We have fitted velocity dispersion against the distance to the satellite galaxy and found the gradient of velocity dispersion is related to the mass of the satellite galaxy. With order-of-magnitude approximations, a linear correlation…