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Ca II H&K stellar activity parameter: a proxy for extreme ultraviolet stellar fluxes
France, K.; Fossati, L.; Sreejith, A. G. +2 more
Atmospheric escape is an important factor shaping the exoplanet population and hence drives our understanding of planet formation. Atmospheric escape from giant planets is driven primarily by the stellar X-ray and extreme ultraviolet (EUV) radiation. Furthermore, EUV and longer wavelength UV radiation power disequilibrium chemistry in the middle a…
Distances to the supernova remnants in the inner disk
Liu, Jifeng; Gao, Jian; Wang, Shu +5 more
Context. Distance measurements of supernova remnants (SNRs) are essential as accurate estimates of physical size, dust masses, and some other properties of SNRs depend critically on accurate distance measurements. However, the determination of SNR distances is still a tough task.
Aims: Red clump stars (RCs) have a long history of being used a…
Mio—First Comprehensive Exploration of Mercury's Space Environment: Mission Overview
Barabash, Stas; Korablev, Oleg; Moncuquet, Michel +17 more
Mercury has a unique and complex space environment with its weak global magnetic field, intense solar wind, tenuous exosphere, and magnetospheric plasma particles. This complex system makes Mercury an excellent science target to understand effects of the solar wind to planetary environments. In addition, investigating Mercury's dynamic magnetosphe…
Three-dimensional Kinematic Reconstruction of the Optically Emitting, High-velocity, Oxygen-rich Ejecta of Supernova Remnant N132D
Law, Charles J.; Orlando, Salvatore; Gladders, Michael D. +9 more
We present a three-dimensional kinematic reconstruction of the optically emitting, oxygen-rich ejecta of supernova remnant N132D in the Large Magellanic Cloud (LMC). Data were obtained with the 6.5 m Magellan telescope in combination with the IMACS+GISMO instrument and survey [O III] λλ4959, 5007 line emission in a ∼3' × 3' region centered on N132…
WISE 2150-7520AB: A Very Low-mass, Wide Comoving Brown Dwarf System Discovered through the Citizen Science Project Backyard Worlds: Planet 9
Gonzales, Eileen C.; Meisner, Aaron M.; Burgasser, Adam J. +10 more
We report the discovery of WISE 2150-7520AB (W2150AB): a widely separated (∼341 au) very low-mass L1 + T8 co-moving system. The system consists of the previously known L1 primary 2MASS J21501592-7520367 and a newly discovered T8 secondary found at position 21:50:18.99-75:20:54.6 (MJD = 57947) using Wide-field Infrared Survey Explorer data via the …
The Evolution of the Inner Regions of Protoplanetary Disks
Calvet, Nuria; Lizano, Susana; Miller, Christopher J. +6 more
We present a study of the evolution of the inner few astronomical units of protoplanetary disks around low-mass stars. We consider nearby stellar groups with ages spanning from 1 to 11 Myr, distributed into four age bins. Combining PANSTARSS photometry with spectral types, we derive the reddening consistently for each star, which we use (1) to mea…
Solar Flare Arcade Modeling: Bridging the Gap from 1D to 3D Simulations of Optically Thin Radiation
Polito, Vanessa; Kerr, Graham S.; Allred, Joel C.
Solar flares are 3D phenomena, but modeling a flare in 3D, including many of the important processes in the chromosphere, is a computational challenge. Accurately modeling the chromosphere is important, even if the transition region and corona are the areas of interest, due to the flow of energy, mass, and radiation through the interconnected laye…
The binary content of multiple populations in NGC 3201
Dreizler, S.; Bastian, N.; Latour, M. +7 more
We investigate the binary content of the two stellar populations that coexist in the globular cluster NGC 3201. Previous studies of binary stars in globular clusters have reported higher binary fractions in their first populations (P1, having field-like abundances) compared to their second populations (P2, having anomalous abundances). This is int…
H- and Dissociation in Ultra-hot Jupiters: A Retrieval Case Study of WASP-18b
Madhusudhan, Nikku; Gandhi, Siddharth; Mandell, Avi
Atmospheres of a number of ultra-hot Jupiters (UHJs) with temperatures ≳2000 K have been observed recently. Many of these planets show largely featureless thermal spectra in the near-infrared observed with the HST WFC3 spectrograph (1.1-1.7 µm) even though this spectral range contains strong H2O opacity. Recent works have proposed…
Lifetime of short-period binaries measured from their Galactic kinematics
Zakamska, Nadia L.; Hwang, Hsiang-Chih
As a significant fraction of stars are in multiple systems, binaries play a crucial role in stellar evolution. Among short-period (<1 d) binary characteristics, age remains one of the most difficult to measure. In this paper, we constrain the lifetime of short-period binaries through their kinematics. With the kinematic information from Gaia Da…