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19912026
Showing 2018 · astro-ph.EPShow all

34 papers · 2 filters

astro-ph.EP2018★ 8 cited

The independent discovery of planet candidates around low mass stars and astrophysical false positives from the first two TESS sectors

Ryan Cloutier

Continuous data releases throughout the TESS primary mission will provide unique opportunities for the exoplanet community at large to contribute to maximizing TESS's scientific re…

astro-ph.EP2018★ 64 cited

Bright Opportunities for Atmospheric Characterization of Small Planets: Masses and Radii of K2-3 b, c, d and GJ3470 b from Radial Velocity Measurements and Spitzer Transits

Molly R. Kosiarek, Ian J. M. Crossfield, Kevin K. Hardegree-Ullman +36

We report improved masses, radii, and densities for four planets in two bright M-dwarf systems, K2-3 and GJ3470, derived from a combination of new radial velocity and transit obser…

astro-ph.EP2018★ 34 cited

Detecting Water In the atmosphere of HR 8799 c with L-band High Dispersion Spectroscopy Aided By Adaptive Optics

Ji Wang, Dimitri Mawet, Jonathan J. Fortney +3

High dispersion spectroscopy of brown dwarfs and exoplanets enables exciting science cases, e.g., mapping surface inhomogeneity and measuring spin rate. Here, we present band o…

astro-ph.EP2018★ 9 cited

Polarization of stars with debris disks: comparing observations with models

Julien Vandeportal, Pierre Bastien, Amélie Simon +2

The Space telescope carried out an unprecedented survey of nearby stars for debris disks. The dust present in these debris disks scatters and polarizes stellar light in…

astro-ph.EP2018★ 69 cited

Deep exploration of Eridani with Keck Ms-band vortex coronagraphy and radial velocities: mass and orbital parameters of the giant exoplanet

Dimitri Mawet, Lea Hirsch, Eve J. Lee +27

We present the most sensitive direct imaging and radial velocity (RV) exploration of Eridani to date. Eridani is an adolescent planetary system, reminiscent of the early So…

astro-ph.EP2018★ 76 cited

Confirmation of the radial velocity super-Earth K2-18c with HARPS and CARMENES

R. Cloutier, N. Astudillo-Defru, R. Doyon +13

In an earlier campaign to characterize the mass of the transiting temperate super-Earth K2-18b with HARPS, a second, non-transiting planet was posited to exist in the system at $\s…

astro-ph.EP2018★ 61 cited

Ground- and Space-based Detection of the Thermal Emission Spectrum of the Transiting Hot Jupiter KELT-2Ab

Danielle Piskorz, Cam Buzard, Michael R. Line +9

We describe the detection of water vapor in the atmosphere of the transiting hot Jupiter KELT-2Ab by treating the star-planet system as a spectroscopic binary with high-resolution,…

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★ 85 cited

Uniformly hot nightside temperatures on short-period gas giants

Dylan Keating, Nicolas B. Cowan, Lisa Dang

Short-period gas giants (hot Jupiters) on circular orbits are expected to be tidally locked into synchronous rotation, with permanent daysides that face their host stars, and perma…

astro-ph.EP2018★ 43 cited

Infrared Variability of Two Dusty White Dwarfs

Siyi Xu, Kate Y. L. Su, Laura Rogers +11

The most heavily polluted white dwarfs often show excess infrared radiation from circumstellar dust disks, which are modeled as a result of tidal disruption of extrasolar minor pla…

astro-ph.EP2018★ 57 cited

The California-Kepler Survey. VI: Kepler Multis and Singles Have Similar Planet and Stellar Properties Indicating a Common Origin

Lauren M. Weiss, Howard T. Isaacson, Geoffrey W. Marcy +7

The California-Kepler Survey (CKS) catalog contains precise stellar and planetary properties for the \Kepler\ planet candidates, including systems with multiple detected transiting…

astro-ph.EP2018★ 103 cited

A second terrestrial planet orbiting the nearby M dwarf LHS 1140

Kristo Ment, Jason A. Dittmann, Nicola Astudillo-Defru +27

LHS 1140 is a nearby mid-M dwarf known to host a temperate rocky super-Earth (LHS 1140 b) on a 24.737-day orbit. Based on photometric observations by MEarth and Spitzer as well as…

astro-ph.EP2018★ 19 cited

WEIRD: Wide-orbit Exoplanet search with InfraRed Direct imaging

Frédérique Baron, Étienne Artigau, Julien Rameau +9

We report results from the Wide-orbit Exoplanet search with InfraRed Direct imaging (WEIRD), a survey designed to search for Jupiter-like companions on very wide orbits (1000 to 50…

astro-ph.EP2018★ 94 cited

Microphysics of KCl and ZnS Clouds on GJ 1214b

Peter Gao, Björn Benneke

Clouds in the atmospheres of exoplanets confound characterization efforts by reducing, eliminating, and distorting spectral signatures of molecular abundances. As such, interpretat…

astro-ph.EP2018★ 129 cited

The 55 Cnc system reassessed

V. Bourrier, X. Dumusque, C. Dorn +9

Orbiting a bright, nearby star the 55 Cnc system offers a rare opportunity to study a multiplanet system that has a wide range of planetary masses and orbital distances. Using two…

astro-ph.EP2018★ 34 cited

Quantifying the Observational Effort Required for the Radial Velocity Characterization of TESS Planets

Ryan Cloutier, René Doyon, François Bouchy +1

The Transiting Exoplanet Survey Satellite will conduct a 2-year long wide-field survey searching for transiting planets around bright stars. Many TESS discoveries will be amenable…

astro-ph.EP2018★ 45 cited

Dynamics and Formation of the Near-Resonant K2-24 System: Insights from Transit-Timing Variations and Radial Velocities

Erik A. Petigura, Björn Benneke, Konstantin Batygin +8

While planets between the size of Uranus and Saturn are absent within the Solar System, the star K2-24 hosts two such planets, K2-24b and c, with radii equal to and $7.5~…

astro-ph.EP2018★ 76 cited

Radial velocity follow-up of GJ1132 with HARPS. A precise mass for planet 'b' and the discovery of a second planet

X. Bonfils, J. -M. Almenara, R. Cloutier +19

GJ1132 is a nearby red dwarf known to host a transiting Earth-size planet. After its initial detection, we pursued an intense follow-up with the HARPS velocimeter. We now confirm t…

astro-ph.EP2018★ 7 cited

A 2 Earth Radius Planet Orbiting the Bright Nearby K-Dwarf Wolf 503

Merrin S. Peterson, Björn Benneke, Courtney D. Dressing +20

Since its launch in 2009, the Kepler telescope has found thousands of planets with radii between that of Earth and Neptune. Recent studies of the distribution of these planets have…

astro-ph.EP2018★ 27 cited

A TESS Dress Rehearsal: Planetary Candidates and Variables from K2 Campaign 17

Ian J. M. Crossfield, Natalia Guerrero, Trevor David +38

We produce light curves for all ~34,000 targets observed with K2 in Campaign 17 (C17), identifying 34 planet candidates, 184 eclipsing binaries, and 222 other periodic variables. T…

astro-ph.EP2018★ 36 cited

Direct Imaging of the HD 35841 Debris Disk: A Polarized Dust Ring from Gemini Planet Imager and an Outer Halo from HST/STIS

Thomas M. Esposito, Gaspard Duchêne, Paul Kalas +55

We present new high resolution imaging of a light-scattering dust ring and halo around the young star HD 35841. Using spectroscopic and polarimetric data from the Gemini Planet Ima…

astro-ph.EP2018★ 40 cited

A More Informative Map: Inverting Thermal Orbital Phase and Eclipse Lightcurves of Exoplanets

E. Rauscher, V. Suri, N. B. Cowan

Only one exoplanet has so far been mapped in both longitude and latitude, but the James Webb Space Telescope should provide mapping-quality data for dozens of exoplanets. The therm…

astro-ph.EP2018★ 64 cited

Quantifying the Bayesian Evidence for a Planet in Radial Velocity Data

Benjamin E. Nelson, Eric B. Ford, Johannes Buchner +5

We present results from a data challenge posed to the radial velocity (RV) community: namely, to quantify the Bayesian "evidence" for n={0,1,2,3} planets in a set of synthetically…

astro-ph.EP2018★ 90 cited

HAT-P-11: Discovery of a Second Planet and a Clue to Understanding Exoplanet Obliquities

Samuel W. Yee, Erik A. Petigura, Benjamin J. Fulton +10

HAT-P-11 is a mid-K dwarf that hosts one of the first Neptune-sized planets found outside the solar system. The orbit of HAT-P-11b is misaligned with the star's spin --- one of the…