output
19912026
Showing 2018 · astro-ph.EPShow all

80 papers · 2 filters

astro-ph.EP2018★ 98 cited

Microlensing Results Challenge the Core Accretion Runaway Growth Scenario for Gas Giants

Daisuke Suzuki, David P. Bennett, Shigeru Ida +14

We compare the planet-to-star mass-ratio distribution measured by gravitational microlensing to core accretion theory predictions from population synthesis models. The core accreti…

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★ 96 cited

Detection of Helium in the Atmosphere of the Exo-Neptune HAT-P-11b

Megan Mansfield, Jacob L. Bean, Antonija Oklopčić +11

The helium absorption triplet at a wavelength of 10,833 Å has been proposed as a way to probe the escaping atmospheres of exoplanets. Recently this feature was detected for the fir…

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★ 10 cited

Astrometry and Occultation predictions to Trans-Neptunian and Centaur Objects observed within the Dark Energy Survey

Martin Banda-Huarca, Julio Camargo, Josselin Desmars +59

Transneptunian objects (TNOs) are a source of invaluable information to access the history and evolution of the outer solar system. However, observing these faint objects is a diff…

astro-ph.EP2018★ 142 cited

A candidate super-Earth planet orbiting near the snow line of Barnard's star

I. Ribas, M. Tuomi, A. Reiners +60

At a distance of 1.8 parsecs, Barnard's star (Gl 699) is a red dwarf with the largest apparent motion of any known stellar object. It is the closest single star to the Sun, second…

astro-ph.EP2018★ 20 cited

Photoevaporative Flows From Exoplanet Atmospheres: A 3-D Radiative Hydrodynamic Parameter Study

Alex Debrecht, Jonathan Carroll-Nellenback, Adam Frank +3

The photoionization-driven evaporation of planetary atmospheres has emerged as a potentially fundamental process for planets on short period orbits. While 1-D studies have proven t…

astro-ph.EP2018★ 80 cited

Morphology of Hydrodynamic Winds: A Study of Planetary Winds in Stellar Environments

John R. McCann, Ruth A. Murray-Clay, Kaitlin Kratter +1

Bathed in intense ionizing radiation, close-in gaseous planets undergo hydrodynamic atmospheric escape, which ejects the upper extent of their atmospheres into the interplanetary m…

astro-ph.EP2018★ 34 cited

Methane in Analogs of Young Directly Imaged Exoplanets

Brittany E. Miles, Andrew J. Skemer, Travis S. Barman +2

We present detections of methane in R of 1300, L band spectra of VHS 1256 b and PSO 318.5, two low gravity, red, late L dwarfs that share the same colors as the HR 8799 plane…

astro-ph.EP2018★ 34 cited

Analysis of Neptune's 2017 Bright Equatorial Storm

Edward Molter, Imke de Pater, Statia Luszcz-Cook +22

We report the discovery of a large (8500 km diameter) infrared-bright storm at Neptune's equator in June 2017. We tracked the storm over a period of 7 months with high-cadenc…

astro-ph.EP2018★ 52 cited

HD2685 b: A Hot-Jupiter orbiting an early F-type star detected by TESS

M. I. Jones, R. Brahm, N. Espinoza +40

We report on the confirmation of a transiting giant planet around the relatively hot (Teff = 6801 56 K) star HD2685, whose transit signal was detected in Sector 1 data of the…

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★ 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★ 130 cited

Connecting Giant Planet Atmosphere and Interior Modeling: Constraints on Atmospheric Metal Enrichment

Daniel P. Thorngren, Jonathan J. Fortney

Atmospheric characterization through spectroscopic analysis, an essential tool of modern exoplanet science, can benefit significantly from the context provided by interior structur…

astro-ph.EP2018★ 53 cited

A Jovian planet in an eccentric 11.5 day orbit around HD1397 discovered by TESS

L. D. Nielsen, F. Bouchy, O. Turner +36

The Transiting Exoplanet Survey Satellite TESS has begun a new age of exoplanet discoveries around bright host stars. We present the discovery of HD 1397b (TOI-120.01), a giant pla…

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★ 15 cited

Dynamical Analysis of Three Distant Trans-Neptunian Objects with Similar Orbits

T. Khain, J. C. Becker, F. C. Adams +62

This paper reports the discovery and orbital characterization of two extreme trans-Neptunian objects (ETNOs), 2016 QV and 2016 QU, which have orbits that appear simil…

astro-ph.EP2018★ 63 cited

New Formation Models for the Kepler-36 System

Peter Bodenheimer, David J. Stevenson, Jack J. Lissauer +1

Formation of the planets in the Kepler-36 system is modeled by detailed numerical simulations according to the core-nucleated accretion scenario. The standard model is updated to i…

astro-ph.EP2018★ 37 cited

Simulating the M-R Relation from APF follow up of TESS targets: Survey design and strategies for overcoming mass biases

Jennifer Burt, Bradford P. Holden, Angie Wolfgang +1

We present simulations of multi-year RV follow up campaigns of the {\it TESS} small exoplanet yield on the Automated Planet Finder telescope, using four different schemes to sample…

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★ 74 cited

The LEECH Exoplanet Imaging Survey: Limits on Planet Occurrence Rates Under Conservative Assumptions

Jordan M. Stone, Andrew J. Skemer, Philip M. Hinz +33

We present the results of the largest (m) direct imaging survey for exoplanets to date, the Large Binocular Telescope Interferometer (LBTI) Exozodi Exoplanet Co…

astro-ph.EP2018★ 40 cited

Measuring the D/H Ratios of Exoplanets and Brown Dwarfs

Caroline V. Morley, Andrew J. Skemer, Brittany E. Miles +5

The relative abundance of deuterium and hydrogen is a potent tracer of planet formation and evolution. Jupiter and Saturn have protosolar atmospheric D/H ratios, a relic of substan…

astro-ph.EP2018★ 22 cited

Kepler-1656b: a Dense Sub-Saturn With an Extreme Eccentricity

Madison T. Brady, Erik A. Petigura, Heather A. Knutson +6

Kepler-1656b is a 5 planet with an orbital period of 32 days initially detected by the prime Kepler mission. We obtained precision radial velocities of Kepler-1656 with Keck/…

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…