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Thermal Instability-Induced Fundamental Magnetic Field Strands in the Solar Corona
Antolin, Patrick; Martínez-Sykora, Juan; Şahin, Seray
Thermal instability is a fundamental process of astrophysical plasmas. It is expected to occur whenever the cooling is dominated by radiation and cannot be compensated for by heating. In this work, we conduct 2.5D radiation MHD simulations with the Bifrost code of an enhanced activity network in the solar atmosphere. Coronal loops are produced sel…
Milky Way Thin and Thick Disk Kinematics with Gaia EDR3 and RAVE DR5
Girard, Terrence M.; Vieira, Katherine; Carraro, Giovanni +3 more
We present a detailed analysis of kinematics of the Milky Way disk in the solar neighborhood using the Gaia DR3 catalog. To determine the local kinematics of the stellar disks of the Milky Way we use a complete sample of 278,228 red giant branch (RGB) stars distributed in a cylinder, centered at the Sun with a 1 kpc radius and half-height of 0.5 k…
The Plasma Environment of Comet 67P/Churyumov-Gerasimenko
Henri, Pierre; Feldman, Paul D.; Simon Wedlund, Cyril +24 more
The environment of a comet is a fascinating and unique laboratory to study plasma processes and the formation of structures such as shocks and discontinuities from electron scales to ion scales and above. The European Space Agency's Rosetta mission collected data for more than two years, from the rendezvous with comet 67P/Churyumov-Gerasimenko in …
Strong H2O and CO Emission Features in the Spectrum of KELT-20b Driven by Stellar UV Irradiation
Deming, Drake; Sing, David K.; Fu, Guangwei +7 more
Know thy star, know thy planetary atmosphere. Every exoplanet with atmospheric measurements orbits around a star, and the stellar environment directly affects the planetary atmosphere. Here we present the emission spectrum of ultra-hot Jupiter KELT-20b which provides an observational link between host-star properties and planet atmospheric thermal…
The RapidXMM upper limit server: X-ray aperture photometry of the XMM-Newton archival observations
Georgakakis, A.; Georgantopoulos, I.; Kretschmar, P. +4 more
This paper presents the construction of the RapidXMM database that is available through the XMM-Newton Science Archive and offers access to upper limits and aperture photometry across the field of view of the XMM-Newton Pointed and Slew Survey observations. The feature of RapidXMM is speed. It enables the fast retrieval of X-ray upper limits and p…
Gaia-ESO Survey: Role of magnetic activity and starspots on pre-main-sequence lithium evolution
Gilmore, G.; Montes, D.; de Laverny, P. +24 more
Context. It is now well-known that pre-main-sequence models with inflated radii should be taken into account to simultaneously reproduce the colour-magnitude diagram and the lithium depletion pattern observed in young open star clusters.
Aims: We tested a new set of pre-main-sequence models that include radius inflation due to the presence of…
Sculpting the Sub-Saturn Occurrence Rate via Atmospheric Mass Loss
Lee, Eve J.; Hallatt, Tim
The sub-Saturn (~4-8 R ⊕) occurrence rate rises with orbital period out to at least ~300 days. In this work we adopt and test the hypothesis that the decrease in their occurrence toward the star is a result of atmospheric mass loss, which can transform sub-Saturns into sub-Neptunes (≲4 R ⊕) more efficiently at shorter periods…
Modeling the Hα and He 10830 Transmission Spectrum of WASP-52b
Yan, Dongdong; Seon, Kwang-il; Guo, Jianheng +2 more
Escaping atmosphere has been detected by the excess absorption of Lyα, Hα and He triplet (λ10830) lines. Simultaneously modeling the absorption of the Hα and He λ10830 lines can provide useful constraints about the exoplanetary atmosphere. In this paper, we use a hydrodynamic model combined with a non-local thermodynamic model and a new Monte Carl…
Linking a universal gas density profile to the core-excised X-ray luminosity in galaxy clusters up to z ∼ 1.1
Arnaud, M.; Pratt, G. W.; Maughan, B. J. +1 more
We investigate the regularity of galaxy cluster gas density profiles and the link to the relation between core-excised luminosity, LXc, and mass from the YX proxy, MYX, for 93 objects selected through their Sunyaev-Zeldovich effect (SZE) signal. The sample spans a mass range of M500 = [0.5−20]…
21 new long-term variables in the GX 339-4 field: two years of MeerKAT monitoring
Heywood, I.; Wijers, R. A. M. J.; Woudt, P. A. +14 more
We present 21 new long-term variable radio sources found commensally in 2 yr of weekly MeerKAT monitoring of the low-mass X-ray binary GX 339-4. The new sources are vary on time-scales of weeks to months and have a variety of light-curve shapes and spectral index properties. Three of the new variable sources are coincident with multiwavelength cou…