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19912026
Showing 2020 · astro-ph.EPShow all

105 papers · 2 filters

astro-ph.EP2020★ 36 cited

Storms and the Depletion of Ammonia in Jupiter: II. Explaining the Juno Observations

Tristan Guillot, Cheng Li, Scott Bolton +8

Observations of Jupiter's deep atmosphere by the Juno spacecraft have revealed several puzzling facts: The concentration of ammonia is variable down to pressures of tens of bars, a…

astro-ph.EP2020★ 7 cited

A review of simulation and performance modeling for the Roman coronagraph instrument

Ewan S. Douglas, Jaren N. Ashcraft, Ruslan Belikov +10

The Nancy Grace Roman Space Telescope Coronagraph Instrument (CGI) will be capable of characterizing exoplanets in reflected light and will demonstrate space technologies essential…

astro-ph.EP2020★ 1 cited

Endogenic and Exogenic Contributions to Visible-wavelength Spectra of Europa's Trailing Hemisphere

Samantha K. Trumbo, Michael E. Brown, Kevin P. Hand

The composition of Europa's trailing hemisphere reflects the combined influences of endogenous geologic resurfacing and exogenous sulfur radiolysis. Using spatially resolved visibl…

astro-ph.EP2020★ 18 cited

Earth as a Proxy Exoplanet: Deconstructing and Reconstructing Spectrophotometric Light Curves

Lixiang Gu, Siteng Fan, Jiazheng Li +7

Point source spectrophotometric ("single-point") light curves of Earth-like planets contain a surprising amount of information about the spatial features of those worlds. Spatially…

astro-ph.EP2020★ 146 cited

The water abundance in Jupiter's equatorial zone

Cheng Li, Andrew Ingersoll, Scott Bolton +20

Oxygen is the most common element after hydrogen and helium in Jupiter's atmosphere, and may have been the primary condensable (as water ice) in the protoplanetary disk. Prior to t…

astro-ph.EP2020★ 110 cited

The search for radio emission from the exoplanetary systems 55 Cancri, Andromedae, and Boötis using LOFAR beam-formed observations

Jake D. Turner, Philippe Zarka, Jean-Mathias Grießmeier +8

Observing planetary auroral radio emission is the most promising method to detect exoplanetary magnetic fields, the knowledge of which will provide valuable insights into the plane…

astro-ph.EP2020★ 27 cited

The Effect of Cosmic Rays on Cometary Nuclei: I Dose deposition

G. Gronoff, R. Maggiolo, G. Cessateur +9

Comets are small bodies thought to contain the most pristine material in the solar system. However, since their formation 4.5 Gy ago, they have been altered by different processes.…

astro-ph.EP2020★ 10 cited

Revisiting the HD 21749 Planetary System with Stellar Activity Modeling

Tianjun Gan, Sharon Xuesong Wang, Johanna K. Teske +26

HD 21749 is a bright ( mag) K dwarf at 16 pc known to host an inner terrestrial planet HD 21749c as well as an outer sub-Neptune HD 21749b, both delivered by TESS. Follow-up…

astro-ph.EP2020★ 6 cited

Bistatic Radar Observations of Near-Earth Asteroid (163899) 2003 SD220 from the Southern Hemisphere

Shinji Horiuchi, Blake Molyneux, Jamie B. Stevens +13

We report results of Canberra-ATCA Doppler-only continuous wave (CW) radar observations of near-Earth asteroid (163899) 2003 SD220 at a receiving frequency of 7159 MHz (4.19 cm) on…

astro-ph.EP2020★ 8 cited

Modeling transmission windows in Titan's lower troposphere: Implications for infrared spectrometers aboard future aerial and surface missions

Paul Corlies, George D. McDonald, Alexander G. Hayes +10

From orbit, the visibility of Titan's surface is limited to a handful of narrow spectral windows in the near-infrared (near-IR), primarily from the absorption of methane gas. This…

astro-ph.EP2020★ 15 cited

Speckle Imaging Characterization of Radial Velocity Exoplanet Systems

Paul A. Dalba, Stephen R. Kane, Steve B. Howell +10

We conducted speckle imaging observations of 53 stellar systems that were members of long-term radial velocity (RV) monitoring campaigns and exhibited substantial accelerations ind…

astro-ph.EP2020★ 54 cited

No escaping helium from 55 Cnc e

Michael Zhang, Heather A. Knutson, Lile Wang +3

We search for escaping helium from the hot super Earth 55 Cnc e by taking high-resolution spectra of the 1083 nm line during two transits using Keck/NIRSPEC. We detect no helium ab…

astro-ph.EP2020★ 2 cited

Impact Probability Under Aleatory And Epistemic Uncertainties

C. Tardioli, D. Farnocchia, M. Vasile +1

We present an approach to estimate an upper bound for the impact probability of a potentially hazardous asteroid when part of the force model depends on unknown parameters whose st…

astro-ph.EP2020★ 97 cited

WASP-107b's density is even lower: a case study for the physics of planetary gas envelope accretion and orbital migration

Caroline Piaulet, Björn Benneke, Ryan A. Rubenzahl +21

With a mass in the Neptune regime and a radius of Jupiter, WASP-107b presents a challenge to planet formation theories. Meanwhile, the planet's low surface gravity and the star's b…

astro-ph.EP2020★ 32 cited

Establishing Earth's Minimoon Population through Characterization of Asteroid 2020 CD

Grigori Fedorets, Marco Micheli, Robert Jedicke +20

We report on our detailed characterization of Earth's second known temporary natural satellite, or minimoon, asteroid 2020 CD3. An artificial origin can be ruled out based on its a…

astro-ph.EP2020★ 25 cited

Radio Observations of HD80606 Near Planetary Periastron: II. LOFAR Low Band Antenna Observations at 30-78 MHz

F. de Gasperin, T. J. W. Lazio, M. Knapp

All the giant planets in the solar system generate radio emission via the electron cyclotron maser instability, most notably giving rise to Jupiter's decametric emissions. An inter…

astro-ph.EP2020★ 11 cited

Aerosols and tides in the martian tropics during southern hemisphere spring equinox from Mars Climate Sounder data

Liam Steele, Armin Kleinboehl, David Kass +1

We analyze Mars Climate Sounder temperature and aerosol data in the tropics to study atmospheric tides and their relation to the dust and water ice distributions. Our results from…

astro-ph.EP2020★ 13 cited

A collage of small planets from the Lick Carnegie Exoplanet Survey : Exploring the super-Earth and sub-Neptune mass regime

Jennifer A. Burt, Fabo Feng, Bradford Holden +12

Analysis of new precision radial velocity (RV) measurements from the Lick Automated Planet Finder (APF) and Keck HIRES have yielded the discovery of three new exoplanet candidates…

astro-ph.EP2020★ 40 cited

Transmission spectroscopy for the warm sub-Neptune HD3167c: evidence for molecular absorption and a possible high metallicity atmosphere

Thomas Mikal-Evans, Ian J. M. Crossfield, Bjorn Benneke +26

We present a transmission spectrum for the warm (500-600K) sub-Neptune HD3167c obtained using the Hubble Space Telescope Wide Field Camera 3 infrared spectrograph. We combine these…

astro-ph.EP2020★ 10 cited

The surface sensitivity of rubble-pile asteroids during a distant planetary encounter: Influence of asteroid shape elongation

Yaeji Kim, Masatoshi Hirabayashi, Richard P Binzel +3

We numerically investigate how an asteroid's elongation controls the sensitivity of its surface to tidal effects during a distant planetary encounter beyond the Roche limit. We ana…

astro-ph.EP2020★ 47 cited

The CARMENES search for exoplanets around M dwarfs -- LP 714-47b (TOI 442.01): Populating the Neptune desert

S. Dreizler, I., J. +134

We report the discovery of a Neptune-like planet (LP 714-47 b, P = 4.05204 d, m_b = 30.8 +/- 1.5 M_earth , R_b = 4.7 +/- 0.3 R_earth ) located in the 'hot Neptune desert'. Confirma…

astro-ph.EP2020★ 42 cited

The Magellan-TESS Survey I: Survey Description and Mid-Survey Results

Johanna Teske, Sharon Xuesong Wang, Angie Wolfgang +66

revealed that roughly one-third of Sun-like stars host planets orbiting within 100 days and between the size of Earth and Neptune. How do these planets form, what are they…

astro-ph.EP2020★ 6 cited

Early High-contrast Imaging Results with Keck/NIRC2-PWFS: The SR 21 Disk

Taichi Uyama, Bin Ren, Dimitri Mawet +22

High-contrast imaging of exoplanets and protoplanetary disks depends on wavefront sensing and correction made by adaptive optics instruments. Classically, wavefront sensing has bee…

astro-ph.EP2020

Spitzer's Solar System studies of asteroids, planets and the zodiacal cloud

David Trilling, Carey Lisse, Dale P. Cruikshank +13

In its 16 years of scientific measurements, the Spitzer Space Telescope performed a number of ground-breaking infrared measurements of Solar System objects. In this second of two p…