Search Publications
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…
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…
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…
Mass-loss Rates for O and Early B Stars Powering Bow Shock Nebulae: Evidence for Bistability Behavior
Kobulnicky, Henry A.; Povich, Matthew S.; Chick, William T.
Second only to initial mass, the rate of wind-driven mass loss determines the final mass of a massive star and the nature of its remnant. Motivated by the need to reconcile observational values and theory, we use a recently vetted technique to analyze the mass-loss rates in a sample of OB stars that generate bow shock nebulae. We measure peculiar …
Light Curves and Rotational Properties of the Pristine Cold Classical Kuiper Belt Objects
Thirouin, Audrey; Sheppard, Scott S.
We present a survey of the rotational and physical properties of the dynamically low inclination Cold Classical (CC) trans-Neptunian objects (TNOs). The CCs are primordial planetesimals and contain information about our solar system and planet formation over the first 100 million years after the Sun’s formation. We obtained partial/complete light …
Kojima-1Lb Is a Mildly Cold Neptune around the Brightest Microlensing Host Star
Kuzuhara, M.; Tamura, M.; Alonso, R. +57 more
We report the analysis of additional multiband photometry and spectroscopy and new adaptive optics (AO) imaging of the nearby planetary microlensing event TCP J05074264+2447555 (Kojima-1), which was discovered toward the Galactic anticenter in 2017 (Nucita et al.). We confirm the planetary nature of the light-curve anomaly around the peak while fi…
Gaia 19ajj: A Young Star Brightening Due to Enhanced Accretion and Reduced Extinction
Hillenbrand, Lynne A.; Reipurth, Bo; Isaacson, Howard +2 more
We report on the source Gaia 19ajj, identifying it as a young star associated with a little-studied star-forming region seen along a complex line of sight through the Gum Nebula. The optical lightcurve recently recorded by Gaia exhibits a slow and unsteady 5.5 mag rise over about 3 yr, while the mid-infrared lightcurve from NEOWISE over the same t…
Transiting Planets Near the Snow Line from Kepler. I. Catalog
Kawahara, Hajime; Masuda, Kento
We present a comprehensive catalog of cool (period P ≳ 2 yr) transiting planet candidates in the 4 yr light curves from the prime Kepler mission. Most of the candidates show only one or two transits and have largely been missed in the original Kepler Object of Interest catalog. Our catalog is based on all known such candidates in the literature, a…
KELT-24b: A 5M J Planet on a 5.6 day Well-aligned Orbit around the Young V = 8.3 F-star HD 93148
Cargile, Phillip A.; Bieryla, Allyson; Latham, David W. +76 more
We present the discovery of KELT-24 b, a massive hot Jupiter orbiting a bright (V = 8.3 mag, K = 7.2 mag) young F-star with a period of 5.6 days. The host star, KELT-24 (HD 93148), has a T eff = {6509}-49+50 K, a mass of M * = {1.460}-0.059+0.055 M ⊙, a radius of R *…
Orbital Motion of the Wide Planetary-mass Companion GSC 6214-210 b: No Evidence for Dynamical Scattering
Rizzuto, Aaron C.; Dupuy, Trent J.; Ireland, Michael J. +5 more
Direct-imaging exoplanet surveys have discovered a class of 5-20 {M}Jup} substellar companions at separations >100 au from their host stars, which present a challenge to planet and star formation models. Detailed analysis of the orbital architecture of these systems can provide constraints on possible formation mechanisms, including …