Showing 2015 · astro-ph.EPShow all

26 papers · 2 filters

astro-ph.EP2015★ 22 cited

Rossby Wave Instability and Long-Term Evolution of Dead Zones in Protoplanetary Discs

Ryan Miranda, Dong Lai, Heloise Meheut

The physical mechanism of angular momentum transport in poorly ionized regions of protoplanetary discs, the dead zones (DZs), is not understood. The presence of a DZ naturally lead…

astro-ph.EP2015★ 197 cited

New constraints on Saturn's interior from Cassini astrometric data

Valéry Lainey, Robert A. Jacobson, Radwan Tajeddine +15

Using astrometric observations spanning more than a century and including a large set of Cassini data, we determine Saturn's tidal parameters through their current effects on the o…

astro-ph.EP2015★ 31 cited

Titan Science with the James Webb Space Telescope (JWST)

Conor A. Nixon, Richard K. Achterberg, Mate Adamkovics +12

The James Webb Space Telescope (JWST), scheduled for launch in 2018, is the successor to the Hubble Space Telescope (HST) but with a significantly larger aperture (6.5 m) and advan…

astro-ph.EP2015★ 485 cited

The Pluto system: Initial results from its exploration by New Horizons

S. A. Stern, F. Bagenal, K. Ennico +148

The Pluto system was recently explored by NASA's New Horizons spacecraft, making closest approach on 14 July 2015. Pluto's surface displays diverse landforms, terrain ages, albedos…

astro-ph.EP2015★ 17 cited

The fate of ethane in Titan's hydrocarbon lakes and seas

Olivier Mousis, Jonathan I. Lunine, Alexander G. Hayes +1

Ethane is expected to be the dominant photochemical product on Titan's surface and, in the absence of a process that sequesters it from exposed surface reservoirs, a major constitu…

astro-ph.EP2015★ 33 cited

The Transit Transmission Spectrum of a Cold Gas Giant Planet

Paul A. Dalba, Philip S. Muirhead, Jonathan J. Fortney +3

We use solar occultations observed by the Visual and Infrared Mapping Spectrometer aboard the Cassini Spacecraft to extract the 1 to 5 micron transmission spectrum of Saturn, as if…

astro-ph.EP2015

Direct imaging of an asymmetric debris disk in the HD 106906 planetary system

Paul G. Kalas, Abhijith Rajan, Jason J. Wang +53

We present the first scattered light detections of the HD 106906 debris disk using Gemini/GPI in the infrared and HST/ACS in the optical. HD 106906 is a 13 Myr old F5V star in the…

astro-ph.EP2015★ 172 cited

Formation and Stellar Spin-Orbit Misalignment of Hot Jupiters from Lidov-Kozai Oscillations in Stellar Binaries

Kassandra R. Anderson, Natalia I. Storch, Dong Lai

Observed hot Jupiter (HJ) systems exhibit a wide range of stellar spin-orbit misalignment angles. The origin of these HJs remains unclear. This paper investigates the inward migrat…

astro-ph.EP2015★ 24 cited

How Janus' Orbital Swap Affects the Edge of Saturn's A Ring?

Maryame El Moutamid, Philip D. Nicholson, Richard G. French +6

We present a study of the behavior of Saturn's A ring outer edge, using images and occultation data obtained by the Cassini spacecraft over a period of 8 years from 2006 to 2014. M…

astro-ph.EP2015★ 34 cited

Meridional variation in tropospheric methane on Titan observed with AO spectroscopy at Keck and VLT

Máté Ádámkovics, Jonathan L. Mitchell, Alexander G. Hayes +10

The spatial distribution of the tropospheric methane on Titan was measured using near-infrared spectroscopy. Ground-based observations at 1.5 (H-band) were performed duri…

astro-ph.EP2015★ 424 cited

Enceladus's measured physical libration requires a global subsurface ocean

P. C. Thomas, R. Tajeddine, M. S. Tiscareno +5

Several planetary satellites apparently have subsurface seas that are of great interest for, among other reasons, their possible habitability. The geologically diverse Saturnian sa…

astro-ph.EP2015★ 29 cited

The effects of a magnetic field on planetary migration in laminar and turbulent discs

M. L. Comins, M. M. Romanova, A. V. Koldoba +2

We investigate the migration of low-mass planets ( and ) in accretion discs threaded with a magnetic field using 2D MHD code in polar coordinates. We o…

astro-ph.EP2015★ 6 cited

Nebular dead zone effects on the D/H ratio in chondrites and comets

Mohamad Ali-Dib, Rebecca G. Martin, Jean-Marc Petit +3

Comets and chondrites show non-monotonic behaviour of their Deuterium to Hydrogen (D/H) ratio as a function of their formation location from the Sun. This is difficult to explain w…

astro-ph.EP2015★ 559 cited

Discovery and spectroscopy of the young Jovian planet 51 Eri b with the Gemini Planet Imager

B. Macintosh, J. R. Graham, T. Barman +85

Directly detecting thermal emission from young extrasolar planets allows measurement of their atmospheric composition and luminosity, which is influenced by their formation mechani…

astro-ph.EP2015★ 29 cited

Observational Signatures of Self-Destructive Civilisations

Adam Stevens, Duncan Forgan, Jack O'Malley-James

We address the possibility that intelligent civilisations that destroy themselves could present signatures observable by humanity. Placing limits on the number of self-destroyed ci…

astro-ph.EP2015★ 63 cited

Testing the Early Mars H2-CO2 Greenhouse Hypothesis with a 1-D Photochemical Model

Natasha Batalha, Shawn D. Domagal-Goldman, Ramses Ramirez +1

A recent study by Ramirez et al. (2014) demonstrated that an atmosphere with 1.3-4 bar of CO2 and H2O, in addition to 5-20% H2, could have raised the mean annual and global surface…

astro-ph.EP2015★ 86 cited

Survival of Planets Around Shrinking Stellar Binaries

Diego J. Muñoz, Dong Lai

The discovery of transiting circumbinary planets by the Kepler mission suggests that planets can form efficiently around binary stars. None of the stellar binaries currently known…

astro-ph.EP2015★ 181 cited

Effect of UV Radiation on the Spectral Fingerprints of Earth-like Planets Orbiting M dwarfs

S. Rugheimer, L. Kaltenegger, A. Segura +2

We model the atmospheres and spectra of Earth-like planets orbiting the entire grid of M dwarfs for active and inactive stellar models with = 2300K to = 3800K a…

astro-ph.EP2015★ 138 cited

UV Surface Environment of Earth-like Planets Orbiting FGKM Stars Through Geological Evolution

S. Rugheimer, A. Segura, L. Kaltenegger +1

The UV environment of a host star affects the photochemistry in the atmosphere, and ultimately the surface UV environment for terrestrial planets and therefore the conditions for t…

astro-ph.EP2015★ 74 cited

How Sedna and family were captured in a close encounter with a solar sibling

Lucie Jilkova, Simon Portegies Zwart, Tjibaria Pijloo +1

The discovery of 2012VP113 initiated the debate on the origin of the Sedna family of planetesimals in orbit around the Sun. Sednitos roam the outer regions of the Solar System betw…

astro-ph.EP2015★ 5 cited

Stability of rings around a triaxial primary

Antoine Lehébel, Matthew S. Tiscareno

Generally, the oblateness of a planet or moon is what causes rings to settle into its equatorial plane. However, the recent suggestion that a ring system might exist (or have exist…

astro-ph.EP2015★ 168 cited

Tidal Truncation of Inclined Circumstellar and Circumbinary Discs in Young Stellar Binaries

Ryan Miranda, Dong Lai

Recent observations have shown that circumstellar and circumbinary discs in young stellar binaries are often misaligned with respect to the binary orbital plane. We analyze the tid…

astro-ph.EP2015★ 163 cited

A nearby M star with three transiting super-Earths discovered by K2

Ian J. M. Crossfield, Erik Petigura, Joshua Schlieder +24

Small, cool planets represent the typical end-products of planetary formation. Studying the archi- tectures of these systems, measuring planet masses and radii, and observing these…

astro-ph.EP2015★ 33 cited

Analytical Model of Tidal Distortion and Dissipation for a Giant Planet with a Viscoelastic Core

Natalia I. Storch, Dong Lai

We present analytical expressions for the tidal Love numbers of a giant planet with a solid core and a fluid envelope. We model the core as a uniform, incompressible, elastic solid…