Search Publications
Searching For Transiting Planets Around Halo Stars. II. Constraining the Occurrence Rate of Hot Jupiters
Li, Ting S.; Collins, Karen A.; Collins, Kevin I. +4 more
Jovian planet formation has been shown to be strongly correlated with host-star metallicity, which is thought to be a proxy for disk solids. Observationally, previous works have indicated that Jovian planets preferentially form around stars with solar and supersolar metallicities. Given these findings, it is challenging to form planets within meta…
OGLE-2018-BLG-1185b: A Low-mass Microlensing Planet Orbiting a Low-mass Dwarf
Kim, S. -L.; Lee, C. -U.; Bryden, G. +96 more
We report an analysis of the planetary microlensing event OGLE-2018-BLG-1185, which was observed by a large number of ground-based telescopes and by the Spitzer Space Telescope. The ground-based light curve indicates a low planet-host star mass ratio of q = (6.9 ± 0.2) × 10-5, which is near the peak of the wide-orbit exoplanet mass-rati…
An Asymmetric Dust Ring around a Very Low Mass Star ZZ Tau IRS
Dong, Ruobing; Hashimoto, Jun; Muto, Takayuki
We present Atacama Large Millimeter/submillimeter Array (ALMA) gas and dust observations at band 7 (339 GHz: 0.89 mm) of the protoplanetary disk around a very low mass star ZZ Tau IRS with a spatial resolution of 0"25. The 12CO J = 3 → 2 position-velocity diagram suggests a dynamical mass of ZZ Tau IRS of ∼0.1-0.3 M⊙. The dis…
The HOSTS Survey: Evidence for an Extended Dust Disk and Constraints on the Presence of Giant Planets in the Habitable Zone of β Leo
Absil, O.; Bryden, G.; Ertel, S. +38 more
The young (50-400 Myr) A3V star β Leo is a primary target to study the formation history and evolution of extrasolar planetary systems as one of the few stars with known hot (∼1600 K), warm (∼600 K), and cold (∼120 K) dust belt components. In this paper, we present deep mid-infrared measurements of the warm dust brightness obtained with the Large …
Cataclysmic Variables in the Second Year of the Zwicky Transient Facility
Duev, Dmitry A.; Riddle, Reed; Szkody, Paula +17 more
Using a filter in the GROWTH Marshal based on color and the amplitude and timescale of variability, we have identified 372 objects as known or candidate cataclysmic variables (CVs) during the second year of the operation of the Zwicky Transient Facility. From the available difference imaging data, we found that 93 are previously confirmed CVs and …
NEMESIS: Exoplanet Transit Survey of Nearby M-dwarfs in TESS FFIs. I.
Feliz, Dax L.; Stassun, Keivan G.; Collins, Kevin I. +4 more
In this work, we present an analysis of 33,054 M-dwarf stars, located within 100 parsecs, via the Transiting Exoplanet Survey Satellite (TESS) full-frame images (FFIs) of observed sectors 1-5. We present a new pipeline called NEMESIS, developed to extract detrended photometry, and to perform transit searches of single-sector data in TESS FFIs. As …
Reducing Ground-based Astrometric Errors with Gaia and Gaussian Processes
Bacon, D.; Bechtol, K.; Smith, M. +65 more
Stochastic field distortions caused by atmospheric turbulence are a fundamental limitation to the astrometric accuracy of ground-based imaging. This distortion field is measurable at the locations of stars with accurate positions provided by the Gaia DR2 catalog; we develop the use of Gaussian process regression (GPR) to interpolate the distortion…
Toward Precise Galaxy Evolution: A Comparison between Spectral Indices of z 1 Galaxies in the IllustrisTNG Simulation and the LEGA-C Survey
Bell, Eric F.; Maseda, Michael V.; Muzzin, Adam +13 more
We present the first comparison of observed stellar continuum spectra of high-redshift galaxies and mock galaxy spectra generated from hydrodynamical simulations. The mock spectra are produced from the IllustrisTNG TNG100 simulation combined with stellar population models and take into account dust attenuation and realistic observational effects (…
The TESS-Keck Survey. VI. Two Eccentric Sub-Neptunes Orbiting HIP-97166
Batalha, Natalie M.; Latham, David W.; Rice, Malena +45 more
We report the discovery of HIP-97166b (TOI-1255b), a transiting sub-Neptune on a 10.3 day orbit around a K0 dwarf 68 pc from Earth. This planet was identified in a systematic search of TESS Objects of Interest for planets with eccentric orbits, based on a mismatch between the observed transit duration and the expected duration for a circular orbit…
ARMADA. I. Triple Companions Detected in B-type Binaries α Del and ν Gem
Gies, Douglas R.; Klement, Robert; Monnier, John D. +19 more
Ground-based optical long-baseline interferometry has the power to measure the orbits of close binary systems at ∼10 µas precision. This precision makes it possible to detect "wobbles" in the binary motion due to the gravitational pull from additional short-period companions. We started the ARrangement for Micro-Arcsecond Differential Astrom…