Showing 2018 · astro-ph.EPShow all

41 papers · 2 filters

astro-ph.EP2018★ 25 cited

Kronoseismology IV. Six previously unidentified waves in Saturn's middle C ring

M. M. Hedman, P. D. Nicholson, R. G. French

Recent studies of stellar occultations observed by the Visual and Infrared Mapping Spectrometer (VIMS) onboard the Cassini spacecraft have demonstrated that multiple spiral wave st…

astro-ph.EP2018★ 84 cited

Chaotic Tides in Migrating Gas Giants: Forming Hot and Transient Warm Jupiters via High-Eccentricity Migration

Michelle Vick, Dong Lai, Kassandra R. Anderson

High-eccentricity migration is an important channel for the formation of hot Jupiters (HJs). In particular, Lidov-Kozai (LK) oscillations of orbital eccentricity/inclination induce…

astro-ph.EP2018★ 206 cited

Hubble PanCET: An extended upper atmosphere of neutral hydrogen around the warm Neptune GJ 3470 b

V. Bourrier, A. Lecavelier des Etangs, D. Ehrenreich +16

GJ 3470b is a warm Neptune transiting an M-dwarf star at the edge of the evaporation desert. It offers the possibility of investigating how low-mass, close-in exoplanets evolve und…

astro-ph.EP2018★ 30 cited

High-Resolution Transit Spectroscopy of Warm Saturns

Emily K. Deibert, Ernst J. W. de Mooij, Ray Jayawardhana +4

We present high-resolution optical transmission spectroscopy of two sub-Saturn mass transiting exoplanets, HAT-P-12b and WASP-69b. With relatively low densities and high atmospheri…

astro-ph.EP2018★ 8 cited

Observation of aerodynamic instability in the flow of a particle stream in a dilute gas

Holly L. Capelo, Jan Molacek, Michiel Lambrechts +5

Forming macroscopic solid bodies in circumstellar discs requires local dust concentration levels significantly higher than the mean. Interactions of the dust particles with the gas…

astro-ph.EP2018★ 53 cited

Ring dynamics around non-axisymmetric bodies with application to Chariklo and Haumea

B. Sicardy, R. Leiva, S. Renner +4

Dense and narrow rings have been discovered recently around the small Centaur object Chariklo and the dwarf planet Haumea, while being suspected around the Centaur Chiron. They are…

astro-ph.EP2018★ 100 cited

Disentangling the planet from the star in late type M dwarfs: A case study of TRAPPIST-1g

Hannah R. Wakeford, Nikole K. Lewis, Julia Fowler +10

The atmospheres of late M stars represent a significant challenge in the characterization of any transiting exoplanets due to the presence of strong molecular features in the stell…

astro-ph.EP2018★ 41 cited

The HST PanCET Program: Hints of Na I & Evidence of a Cloudy Atmosphere for the Inflated Hot Jupiter WASP-52b

Munazza K. Alam, Nikolay Nikolov, Mercedes Lopez-Morales +16

We present an optical to near-infrared transmission spectrum of the inflated hot Jupiter WASP-52b using three transit observations from the Space Telescope Imaging Spectrograph (ST…

astro-ph.EP2018★ 45 cited

Fully scalable forward model grid of exoplanet transmission spectra

Jayesh M. Goyal, Hannah R. Wakeford, Nathan J. Mayne +3

Simulated exoplanet transmission spectra are critical for planning and interpretation of observations and to explore the sensitivity of spectral features to atmospheric thermochemi…

astro-ph.EP2018★ 167 cited

An optical transmission spectrum for the ultra-hot Jupiter WASP-121b measured with the Hubble Space Telescope

Thomas M. Evans, David K. Sing, Jayesh Goyal +24

We present an atmospheric transmission spectrum for the ultra-hot Jupiter WASP-121b, measured using the Space Telescope Imaging Spectrograph (STIS) onboard the Hubble Space Telesco…

astro-ph.EP2018★ 64 cited

Limits on Clouds and Hazes for the TRAPPIST-1 Planets

Sarah E. Moran, Sarah M. Hörst, Natasha E. Batalha +2

The TRAPPIST-1 planetary system is an excellent candidate for study of the evolution and habitability of M-dwarf planets. Transmission spectroscopy observations performed with the…

astro-ph.EP2018★ 18 cited

Planet occurrence rate density models including stellar effective temperature

Daniel Garrett, Dmitry Savransky, Rus Belikov

We present planet occurrence rate density models fit to Kepler data as a function of semi-major axis, planetary radius, and stellar effective temperature. We find that occurrence r…

astro-ph.EP2018★ 2 cited

Approximating Annual Mean Incoming Solar Radiation

Alice Nadeau, Richard McGehee

We derive the Legendre series expansion for the insolation distribution on rapidly rotating planets as a function of sine of the latitude and the planet's obliquity. We give an exp…

astro-ph.EP2018★ 52 cited

Studying the solar system with the International Pulsar Timing Array

R. N. Caballero, Y. J. Guo, K. J. Lee +77

Pulsar-timing analyses are sensitive to errors in the solar-system ephemerides (SSEs) that timing models utilise to estimate the location of the solar-system barycentre, the quasi-…

astro-ph.EP2018★ 41 cited

The Vegetation Red Edge Biosignature Through Time on Earth and Exoplanets

Jack T. O'Malley-James, Lisa Kaltenegger

The high reflection of land vegetation in the near-infrared, the vegetation red edge (VRE), is often cited as a spectral biosignature for surface vegetation on exoplanets. The VRE…

astro-ph.EP2018★ 161 cited

TESS Discovery of an ultra-short-period planet around the nearby M dwarf LHS 3844

Roland Vanderspek, Chelsea X. Huang, Andrew Vanderburg +45

Data from the newly-commissioned \textit{Transiting Exoplanet Survey Satellite} (TESS) has revealed a "hot Earth" around LHS 3844, an M dwarf located 15 pc away. The planet has a r…

astro-ph.EP2018★ 31 cited

The Cassini VIMS archive of Titan: from browse products to global infrared color maps

Stéphane Le Mouélic, Thomas Cornet, Sébastien Rodriguez +11

We have analyzed the complete Visual and Infrared Mapping Spectrometer (VIMS) data archive of Titan. Our objective is to build global surface cartographic products, by combining al…

astro-ph.EP2018★ 141 cited

Dynamical Constraints on the HR 8799 Planets with GPI

Jason J. Wang, James R. Graham, Rebekah Dawson +52

The HR 8799 system uniquely harbors four young super-Jupiters whose orbits can provide insights into the system's dynamical history and constrain the masses of the planets themselv…

astro-ph.EP2018★ 27 cited

Abrupt climate transition of icy worlds from snowball to moist or runaway greenhouse

Jun Yang, Feng Ding, Ramses M. Ramirez +3

Ongoing and future space missions aim to identify potentially habitable planets in our Solar System and beyond. Planetary habitability is determined not only by a planet's current…

astro-ph.EP2018★ 207 cited

TESS Discovery of a Transiting Super-Earth in the Mensae System

Chelsea X. Huang, Jennifer Burt, Andrew Vanderburg +45

We report the detection of a transiting planet around Mensae (HD 39091), using data from the Transiting Exoplanet Survey Satellite (TESS). The solar-type host star is unusually…

astro-ph.EP2018★ 33 cited

3D Simulations of Planet Trapping at Disc-Cavity Boundaries

M. M. Romanova, P. S. Lii, A. V. Koldoba +4

Inward migration of low-mass planets and embryos of giant planets can be stopped at the disc-cavity boundaries due to co-orbital corotation torque. We performed the first global th…

astro-ph.EP2018★ 37 cited

A Catalog of Spectra, Albedos, and Colors of Solar System Bodies for Exoplanet Comparison

J. H. Madden, Lisa Kaltenegger

We present a catalog of spectra and geometric albedos, representative of the different types of Solar System bodies, from 0.45 to 2.5 microns. We analyzed published calibrated, un-…

astro-ph.EP2018★ 32 cited

Color Classification of Extrasolar Giant Planets: Prospects and Cautions

Natasha E. Batalha, Adam J. R. W. Smith, Nikole K. Lewis +3

Atmospheric characterization of directly imaged planets has thus far been limited to ground-based observations of young, self-luminous, Jovian planets. Near-term space- and ground-…

astro-ph.EP2018★ 24 cited

Teetering Stars: Resonant Excitation of Stellar Obliquities by Hot and Warm Jupiters with External Companions

Kassandra R. Anderson, Dong Lai

Stellar spin-orbit misalignments (obliquities) in hot Jupiter systems have been extensively probed. Such obliquities may reveal clues about hot Jupiter dynamical histories. Common…