Search Publications
On the Relation Between Jovian Aurorae and the Loading/Unloading of the Magnetic Flux: Simultaneous Measurements From Juno, Hubble Space Telescope, and Hisaki
Kurth, W. S.; Bagenal, F.; Yoshioka, K. +20 more
We present simultaneous observations of aurorae at Jupiter from the Hubble Space Telescope and Hisaki, in combination with the in situ measurements of magnetic field, particles, and radio waves from the Juno Spacecraft in the outer magnetosphere, from 80RJ to 60RJ during 17 to 22 March 2017. Two cycles of accumulation and rel…
K2-146: Discovery of Planet c, Precise Masses from Transit Timing, and Observed Precession
Kruse, Ethan; Montet, Benjamin T.; Fabrycky, Daniel C. +2 more
K2-146 is a mid-M dwarf (M ⋆ = 0.331 ± 0.009M ⊙ R ⋆ = 0.330 ± 0.010R ⊙), observed in Campaigns 5, 16, and 18 of the K2 mission. In Campaign 5 data, a single planet was discovered with an orbital period of 2.6 days and large transit timing variations due to an unknown perturber. Here, we analyze data from…
BVRCIC Observations, Analysis, and Spectra of The Most Extreme Mass Ratio (Totally Eclipsing) W UMa Binary, V1187 Herculis
Hill, Robert; Samec, Ronald G.; Chamberlain, Heather +4 more
CCD, BVRI primary light curves of V1187 Her were taken in 2017 May and 2018 May at the Dark Sky Observatory in North Carolina with the 0.81-m reflector of Appalachian State University. A spectrum was taken earlier at Dominion Astrophysical Observatory (DAO) with the 1.8 m telescope. The spectral type is F(8.5 ± 1)V, resulting in a surface temperat…
Characterization of a Sample of Southern M Dwarfs Using Harps and X-shooter Spectra
del Burgo, C.; Pavlenko, Ya. V.; Kuznetsov, M. K. +1 more
We present the homogeneous analysis of a sample of Southern early-type M dwarfs in the solar neighborhood (d < 60 pc). We used the MCAL technique to derive the effective temperature T eff, metallicity [Fe/H], and activity index i a (H alpha) of 420 M stars using HARPS spectra. The effective temperature T e…
Detection of Planetary and Stellar Companions to Neighboring Stars via a Combination of Radial Velocity and Direct Imaging Techniques
Butler, R. Paul; Kane, Stephen R.; Wittenmyer, Robert A. +13 more
The sensitivities of radial velocity (RV) surveys for exoplanet detection are extending to increasingly longer orbital periods, where companions with periods of several years are now being regularly discovered. Companions with orbital periods that exceed the duration of the survey manifest in the data as an incomplete orbit or linear trend, a feat…
The stellar halo of isolated central galaxies in the Hyper Suprime-Cam imaging survey
Sonnenfeld, Alessandro; Wang, Wenting; Han, Jiaxin +14 more
We study the faint stellar halo of isolated central galaxies, by stacking galaxy images in the HSC survey and accounting for the residual sky background sampled with random points. The surface brightness profiles in HSC r band are measured for a wide range of galaxy stellar masses (9.2 < log10M∗/M⊙ < 11.4) an…
Detection of Superluminal Motion in the X-Ray Jet of M87
Cheung, C. C.; Jones, Christine; Meyer, Eileen T. +5 more
Chandra HRC observations are investigated for evidence of proper motion and brightness changes in the X-ray jet of the nearby radio galaxy M87. Using images spanning 5 yr, proper motion is measured in the X-ray knot HST-1, with a superluminal apparent speed of 6.3 ± 0.4c, or 24.1 ± 1.6 mas yr-1, and in Knot D, with a speed of 2.4 ± 0.6c…
The Relation between Galaxy ISM and Circumgalactic O VI Gas Kinematics Derived from Observations and ΛCDM Simulations
Charlton, Jane C.; Kacprzak, Glenn G.; Churchill, Christopher W. +8 more
We present the first galaxy-O VI absorption kinematic study for 20 absorption systems (EW > 0.1 Å) associated with isolated galaxies (0.15 ≤ z ≤ 0.55) that have accurate redshifts and rotation curves obtained using Keck/ESI. Our sample is split into two azimuthal angle bins: major axis (Φ < 25°) and minor axis (Φ > 33°). O VI absorption a…
CHANG-ES. XX. High-resolution Radio Continuum Images of Edge-on Galaxies and Their AGNs: Data Release 3
Saikia, D. J.; Wang, Q. Daniel; Irwin, Judith +17 more
The CHANG-ES galaxy sample consists of 35 nearby edge-on galaxies that have been observed using the VLA at 1.6 and 6.0 GHz. Here we present the third data release of our sample, namely, the B configuration 1.6 GHz sample. In addition, we make available the band-to-band spectral index maps between 1.6 and 6.0 GHz, the latter taken in the matching r…
Observational evidence for a dry dust-wind origin of Mars seasonal dark flows
Vincendon, Mathieu; Carter, John; Stcherbinine, Aurélien +1 more
Seasonal flows on warm slopes, or recurring slope lineae ("RSL"), have been presented as strong evidence for currently flowing water on Mars. This assumption was supported by a correlation between activity and warm temperatures, and by the spectral identification of hydrated salts. Here we first demonstrate that salts spectral identification is no…