Search Publications
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…
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…
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…
New Constraints on the Future Evaporation of the Young Exoplanets in the V1298 Tau System
Sozzetti, A.; Micela, G.; Damasso, M. +7 more
Transiting planets at young ages are key targets for improving our understanding of the evolution of exo-atmospheres. We present results of a new X-ray observation of V 1298 Tau with XMM-Newton, aimed to determine more accurately the high-energy irradiation of the four planets orbiting this pre-main-sequence star, and the possible variability due …
The Star-forming Main Sequence of the Host Galaxies of Low-redshift Quasars
Ho, Luis C.; Zhuang, Ming-Yang
We investigate the star-forming main sequence of the host galaxies of a large, well-defined sample of 453 redshift ~0.3 quasars with previously available star formation rates by deriving stellar masses from modeling their broadband (grizy) spectral energy distribution. We perform two-dimensional, simultaneous, multi-filter decomposition of Pan-STA…
CLEAR: Boosted Lyα Transmission of the Intergalactic Medium in UV-bright Galaxies
Papovich, Casey; Finkelstein, Steven L.; Cleri, Nikko J. +11 more
Reionization is an inhomogeneous process, thought to begin in small ionized bubbles of the intergalactic medium (IGM) around overdense regions of galaxies. Recent Lyα studies during the epoch of reionization show evidence that ionized bubbles formed earlier around brighter galaxies, suggesting higher IGM transmission of Lyα from these galaxies. We…
RR Lyrae-based Distances for 39 Nearby Dwarf Galaxies Calibrated to Gaia eDR3
El-Badry, Kareem; Weisz, Daniel R.; Nagarajan, Pranav
We provide uniform RR Lyrae-based distances to 39 dwarf galaxies in and around the Local Group. We determine distances based on a Bayesian hierarchical model that uses periods and magnitudes of published RR Lyrae in dwarf galaxies and is anchored to well-studied Milky Way (MW) RR Lyrae with spectroscopic metallicities and Gaia eDR3 parallaxes. Gai…
The First Short GRB Millimeter Afterglow: The Wide-angled Jet of the Extremely Energetic SGRB 211106A
Kilpatrick, Charles D.; Bhandari, Shivani; Fong, Wen-fai +14 more
We present the discovery of the first millimeter afterglow of a short-duration γ-ray burst (SGRB) and the first confirmed afterglow of an SGRB localized by the GUANO system on Swift. Our Atacama Large Millimeter/Sub-millimeter Array (ALMA) detection of SGRB 211106A establishes an origin in a faint host galaxy detected in Hubble Space Telescope ima…