Search Publications
Missions
Journals
Publication Years
Statistics of the Chemical Composition of Solar Analog Stars and Links to Planet Formation
Beaton, Rachael L.; Jain, Bhuvnesh; Teske, Johanna K. +3 more
The Sun has been found to be depleted in refractory (rock-forming) elements relative to nearby solar analogs, suggesting a potential indicator of planet formation. Given the small amplitude of the depletion, previous analyses have primarily relied on high signal-to-noise stellar spectra and a strictly differential approach to determine elemental a…
Transmission Spectroscopy of the Earth-Sun System to Inform the Search for Extrasolar Life
May, E. M.; Mayorga, L. C.; Sotzen, Kristin S. +7 more
Upcoming NASA astrophysics missions such as the James Webb Space Telescope will search for signs of life on planets transiting nearby stars. Doing so will require coadding dozens of transmission spectra to build up sufficient signal to noise while simultaneously accounting for challenging systematic effects such as surface/weather variability, atm…
Speckle Interferometry of Nearby Multiple Stars. II. 2007-2020 Positional Measurements and Orbits of Sixteen Objects
Dyachenko, V.; Beskakotov, A.; Maksimov, A. +3 more
Long-term monitoring at the 6 m telescope of the Special Astrophysical Observatory of the Russian Academy of Sciences made it possible to improve the orbits of 15 objects (HIP 689, HIP 3951, HIP 10438, HIP 43948, HIP 69962, HIP 95995, HIP 102029, HIP 102357, HIP 104383, HIP 105947, HIP 106255, HIP 108917, HIP 111546, HIP 113726, HIP 114922) and co…
Seasonal and Spatial Variability of Carbon Monoxide (CO) in the Martian Atmosphere From PFS/MEX Observations
Vandaele, Ann Carine; Daerden, Frank; Neary, Lori +7 more
A subset of more than 100,000 nadir measurements covering more than 7 Martian years (MY 26-MY 33) recorded in the thermal part of the Short Wavelength Channel (SWC) from the Planetary Fourier Spectrometer (PFS) on board Mars Express is exploited to investigate the global distribution and the seasonal cycle of carbon monoxide (CO) on Mars. The retr…
Interplanetary Coronal Mass Ejections from MAVEN Orbital Observations at Mars
Feng, Xueshang; Wang, Yang; Liu, Libo +9 more
The measurements from the Mars Atmosphere and Volatile EvolutioN spacecraft, in orbit around Mars, are utilized to investigate interplanetary coronal mass ejections (ICMEs) near 1.52 au. We identify 24 ICMEs from 2014 December 6 to 2019 February 21. The ICME list is used to examine the statistical properties of ICMEs. On average, the magnetic fiel…
Energetic ions in the Venusian system: Insights from the first Solar Orbiter flyby
Kulkarni, S. R.; Maksimovic, M.; Bale, S. D. +54 more
The Solar Orbiter flyby of Venus on 27 December 2020 allowed for an opportunity to measure the suprathermal to energetic ions in the Venusian system over a large range of radial distances to better understand the acceleration processes within the system and provide a characterization of galactic cosmic rays near the planet. Bursty suprathermal ion…
Fe VII Emission Lines in the Wavelength Range 193-197 Å
Landi, Enrico; Young, Peter R.; Ryabtsev, Alexander N.
The identifications of Fe VII emission lines in the wavelength range 193-197 Å are discussed in the light of new measurements of laboratory spectra and atomic data calculations. This region is of importance to studies of solar spectra from the EUV Imaging Spectrometer (EIS) on board the Hinode spacecraft, which has its peak sensitivity at these wa…
How many suns are in the sky? A SPHERE multiplicity survey of exoplanet host stars. I. Four new close stellar companions including a white dwarf
Ginski, C.; Mugrauer, M.; Vogt, N. +2 more
Aims: We are studying the influence of stellar multiplicity on exoplanet systems and, in particular, systems that have been detected via radial-velocity searches. We are specifically interested in the closest companions as they would have a strong influence on the evolution of the original planet-forming disks. In this study, we present new c…
Wavelength Dependence of Activity-induced Photometric Variations for Young Cool Stars in Hyades
Gaidos, Eric; Miyakawa, Kohei; Hirano, Teruyuki +3 more
We investigate photometric variations due to stellar activity that induce systematic radial-velocity errors (so-called "jitter") for the four targets in the Hyades open cluster observed by the K2 mission (EPIC 210721261, EPIC 210923016, EPIC 247122957, and EPIC 247783757). Applying Gaussian process regressions to the K2 light curves and the near-i…
Seamless 3D Image Mapping and Mosaicing of Valles Marineris on Mars Using Orbital HRSC Stereo and Panchromatic Images
Tao, Yu; Michael, Greg; Muller, Jan-Peter +2 more