Search Publications
The Pulsating Eclipsing Binary TIC 309658221 in a 7.59-day Orbit
Kristiansen, Martti H.; Hong, Kyeongsoo; Lee, Jae Woo
We present a new eclipsing binary (EB) showing multiperiodic oscillations using the first three sectors of Transiting Exoplanet Survey Satellite (TESS) photometry. The eclipse and pulsation light curves of TIC 309658221 were modeled using an iterative method to obtain a consistent photometric solution. The TESS target is a circular-orbit, detached…
ExoMars Atmospheric Mars Entry and Landing Investigations and Analysis (AMELIA)
Colombatti, Giacomo; Bettanini, Carlo; Aboudan, Alessio +25 more
The entry, descent and landing of Schiaparelli, the ExoMars Entry, descent and landing Demonstrator Module (EDM), offered a rare (once-per-mission) opportunity for in situ investigations of the martian environment over a wide altitude range. The aim of the ExoMars AMELIA experiment was to exploit the Entry, Descent and Landing System (EDLS) engine…
Atmospheres and UV Environments of Earth-like Planets throughout Post-main-sequence Evolution
Kaltenegger, Lisa; Kozakis, Thea
During the post-main-sequence (post-MS) phase of stellar evolution, the orbital distance of the habitable zone (HZ), which allows for liquid surface water on terrestrial planets, moves out past the system’s original frost line, providing an opportunity for outer planetary system surface habitability. We use a 1D coupled climate/photochemistry code…
The Deposition and Alteration History of the Northeast Syrtis Major Layered Sulfates
Ehlmann, B. L.; Quinn, D. P.
Ancient stratigraphy on Isidis Basin's western margin records the history of water on early Mars. Noachian units are overlain by layered, basaltic composition sedimentary rocks that are enriched in polyhydrated sulfates and capped by more resistant units. The layered sulfates—uniquely exposed at northeast Syrtis Major—comprise a sedimentary sequen…
A NuSTAR view of powerful γ-ray loud blazars
Tagliaferri, G.; Ghirlanda, G.; Ghisellini, G. +6 more
We observed three blazars at z > 2 with the NuSTAR satellite. These were detected in the γ-rays by Fermi/LAT and in the soft X-rays, but have not yet been observed above 10 keV. The flux and slope of their X-ray continuum, together with Fermi/LAT data allows us to estimate their total electromagnetic output and peak frequency. For some of them …
Rest-frame UV and optical emission line diagnostics of ionized gas properties: a test case in a star-forming knot of a lensed galaxy at z ∼ 1.7
Kewley, Lisa J.; Blanc, Guillermo A.; Acharyya, Ayan +7 more
We examine the diagnostic power of rest-frame ultraviolet (UV) nebular emission lines, and compare them to more commonly used rest-frame optical emission lines, using the test case of a single star-forming knot of the bright lensed galaxy RCSGA 032727-132609 at redshift z ∼ 1.7. This galaxy has complete coverage of all the major rest-frame UV and …
Multiwavelength Investigation of Pulsar Wind Nebula DA 495 with HAWC, VERITAS, and NuSTAR
Zhang, H.; Li, H.; Gotthelf, E. V. +10 more
Pulsar wind nebula DA 495 (G65.7+1.2) was detected in TeV gamma-rays by the High Altitude Water Cerenkov Observatory in 2017 (2HWC J1953+294). Follow-up observations by the Very Energetic Radiation Imaging Telescope Array System confirmed the association between 2HWC J1953+294 and DA 495 and found the TeV emission to be spatially coincident with t…
Nonthermal Emission from the Interaction of Magnetized Exoplanets with the Wind of Their Host Star
Loeb, Abraham; Wang, Xiawei
We study the nonthermal emission from the interaction between magnetized Jupiter-like exoplanets and the wind from their host star. The supersonic motion of planets through the wind forms a bow shock that accelerates electrons that produce nonthermal radiation across a broad wavelength range. We discuss three wind mass-loss rates: {\dot{M}}{{…
Temporal and spectral X-ray properties of magnetar SGR 1900+14 derived from observations with NuSTAR and XMM-Newton
Enoto, Teruaki; Bamba, Aya; Odaka, Hirokazu +1 more
X-ray observations play a crucial role in understanding the emission mechanism and relevant physical phenomena of magnetars. We report on X-ray observations made in 2016 of a young magnetar, SGR 1900+14, which is famous for a giant flare in 1998 August. Simultaneous observations were conducted with XMM-Newton and NuSTAR on 2016 October 20 with 23 …
Equatorial Propagation of the Magnetosonic Mode Across the Plasmapause: 2-D PIC Simulations
Boardsen, Scott A.; Liu, Kaijun; Denton, Richard E. +2 more
Recent studies have indicated that fast magnetosonic waves (also referred to as equatorial noise) excited far outside the plasmapause cannot propagate deep into the plasmasphere because of the preferential azimuthal propagation of the waves at the source region. Since conditions in the low-density plasma trough are typically favorable for the wave…