Showing 2018 · astro-ph.EPShow all

138 papers · 2 filters

astro-ph.EP2018★ 33 cited

Spectrophotometric Modeling and Mapping of Ceres

Jian-Yang Li, Stefan E. Schröder, Stefano Mottola +8

We report a comprehensive analysis of the global spectrophotometric properties of Ceres using Dawn Framing Camera images collected from April to June 2015 during the RC3 and Survey…

astro-ph.EP2018★ 7 cited

ROSETTA/OSIRIS observations of the 67P nucleus during the April 2016 flyby: high-resolution spectrophotometry

C. Feller, S. Fornasier, S. Ferrari +35

In April 2016, the Rosetta spacecraft performed a low-altitude low-phase-angle flyby over the Imhotep-Khepry transition of 67P/Churyumov-Gerasimenko's nucleus. The OSIRIS/Narrow-An…

astro-ph.EP2018★ 24 cited

Isochronal age-mass discrepancy of young stars: SCExAO/CHARIS integral field spectroscopy of the HIP 79124 triple system

Ruben Asensio-Torres, Thayne Currie, Markus Janson +24

We present SCExAO/CHARIS 1.1--2.4 micron integral field direct spectroscopy of the young HIP 79124 triple system. HIP 79124 is a member of the Scorpius-Centaurus association, consi…

astro-ph.EP2018★ 70 cited

Probable detection of hydrogen sulphide (HS) in Neptune's atmosphere

Patrick G. J. Irwin, Daniel Toledo, Ryan Garland +4

Recent analysis of Gemini-North/NIFS H-band (1.45 - 1.8 m) observations of Uranus, recorded in 2010, with recently updated line data has revealed the spectral signature of hydro…

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★ 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★ 54 cited

(3200) Phaethon: Bulk density from Yarkovsky drift detection

Josef Hanus, David Vokrouhlicky, Marco Delbo +8

The recent close approach of the NEA (3200) Phaethon offered a rare opportunity to obtain high-quality observational data. We used the newly obtained optical light curves to improv…

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★ 68 cited

Dust-Pileup at the Dead-Zone Inner Edge and Implications for the Disk Shadow

Takahiro Ueda, Mario Flock, Satoshi Okuzumi

We perform simulations of the dust and gas disk evolution to investigate the observational features of a dust-pileup at the dead-zone inner edge. We show that the total mass of acc…

astro-ph.EP2018★ 109 cited

Spitzer Observations of Interstellar Object 1I/`Oumuamua

DE Trilling, M Mommert, JL Hora +20

1I/`Oumuamua is the first confirmed interstellar body in our Solar System. Here we report on observations of `Oumuamua made with the Spitzer Space Telescope on 2017 November 21--22…

astro-ph.EP2018★ 1 cited

Seismicity on Tidally Active Solid-Surface Worlds

T. A. Hurford, W. G. Henning, R. Maguire +8

Tidal interactions between planets or stars and the bodies that orbit them dissipate energy in their interiors. The energy dissipated drives internal heating and a fraction of that…

astro-ph.EP2018★ 21 cited

Comprehensive analysis of HD 105, a young Solar System analog

J. P. Marshall, J. Milli, É. Choquet +5

HD~105 is a nearby, pre-main sequence G0 star hosting a moderately bright debris disc (). HD~105 and its surroundings might therefore…

astro-ph.EP2018★ 13 cited

Ionization-Driven Depletion and Redistribution of CO in Protoplanetary Disks

Sarah E. Dodson-Robinson, Neal J. Evans, Alyssa Ramos +2

Based on the interstellar CO/H2 ratio, carbon monoxide-based censuses of protoplanetary disks in Lupus, sigma Orionis, and Chamaeleon I found no disks more massive than the minimum…

astro-ph.EP2018★ 11 cited

Ceres' opposition effect observed by the Dawn framing camera

Stefan E. Schröder, Jian-Yang Li, Marc D. Rayman +12

The surface reflectance of planetary regoliths may increase dramatically towards zero phase angle, a phenomenon known as the opposition effect (OE). Two physical processes that are…

astro-ph.EP2018★ 18 cited

APPROX -- Mutual approximations between the Galilean moons. The 2016-2018 observational campaign

B. Morgado, R. Vieira-Martins, M. Assafin +23

The technique of mutual approximations accurately gives the central instant at the maximum apparent approximation of two moving natural satellites in the sky plane. This can be use…

astro-ph.EP2018★ 21 cited

Ongoing Resurfacing of KBO Eris by Volatile Transport in Local, Collisional, Sublimation Atmosphere Regime

Jason D. Hofgartner, Bonnie J. Buratti, Paul O. Hayne +1

Kuiper belt object (KBO) Eris is exceptionally bright with a greater visible geometric albedo than any other known KBO. Its infrared reflectance spectrum is dominated by methane, w…

astro-ph.EP2018★ 9 cited

Response to "An empirical examination of WISE/NEOWISE asteroid analysis and results"

Edward Wright, Amy Mainzer, Joseph Masiero +3

We show that a number of claims made in Myhrvold (2018) (hereafter M2018b) regarding the WISE data and thermal modeling of asteroids are incorrect. That paper provides thermal fit…

astro-ph.EP2018★ 17 cited

Two Terrestrial Planet Families With Different Origins

Mark Swain, Raissa Estrela, Christophe Sotin +2

The potentially important role of stellar irradiation in envelope removal for planets with diameters of 2 R$_{\Earth}$ has been inferred both through theoretical work…

astro-ph.EP2018★ 17 cited

Ground-based Spectroscopy of the Exoplanet XO-2b using a Systematic Wavelength Calibration

Kyle A. Pearson, Caitlin A. Griffith, Robert T. Zellem +2

Exoplanets orbiting close to their host star are expected to support a large ionosphere, which extends to larger pressures than witnessed in our Solar System. These ionospheres can…

astro-ph.EP2018★ 48 cited

A Spatially Resolved AU-scale Inner Disk around DM Tau

Tomoyuki Kudo, Jun Hashimoto, Takayuki Muto +5

We present Atacama Large Millimeter/submillimeter Array (ALMA) observations of the dust continuum emission at 1.3 mm and 12CO J=2-1 line emission of the transitional disk around DM…

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★ 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★ 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

SCExAO/CHARIS Near-Infrared Direct Imaging, Spectroscopy, and Forward-Modeling of kappa And b: A Likely Young, Low-Gravity Superjovian Companion

Thayne Currie, Timothy D. Brandt, Taichi Uyama +30

We present SCExAO/CHARIS high-contrast imaging/ integral field spectroscopy of And b, a directly-imaged low-mass companion orbiting a nearby B9V star. We detect And b…