Search Publications
Twenty-five Years of Accretion onto the Classical T Tauri Star TW Hya
Fang, Min; Edwards, Suzan; Herczeg, Gregory J. +39 more
Accretion plays a central role in the physics that governs the evolution and dispersal of protoplanetary disks. The primary goal of this paper is to analyze the stability over time of the mass accretion rate onto TW Hya, the nearest accreting solar-mass young star. We measure veiling across the optical spectrum in 1169 archival high-resolution spe…
Clumping and X-rays in cooler B supergiant stars
Bouret, J. -C.; Oskinova, L. M.; Sander, A. A. C. +6 more
Context. B supergiants (BSGs) are evolved stars with effective temperatures between ~10 to ~30 kK. Knowing the properties of these objects is important to understand massive star evolution. Located on the cool end of the line-driven wind regime, the study of their atmospheres can help us to understand the physics of their winds and phenomena such …
The State of the Molecular Gas in Post-starburst Galaxies
Zabludoff, Ann I.; French, K. Decker; Narayanan, Desika +7 more
The molecular gas in galaxies traces both the fuel for star formation and the processes that can enhance or suppress star formation. Observations of the molecular gas state can thus point to when and why galaxies stop forming stars. In this study, we present Atacama Large Millimeter/submillimeter Array observations of the molecular gas in galaxies…
Observational Evidence of S-web Source of the Slow Solar Wind
Barczynski, K.; Peter, H.; Zhukov, A. N. +25 more
From 2022 March 18 to 21, NOAA Active Region (AR) 12967 was tracked simultaneously by Solar Orbiter at 0.35 au and Hinode/EIS at Earth. During this period, strong blueshifted plasma upflows were observed along a thin, dark corridor of open magnetic field originating at the AR's leading polarity and continuing toward the southern extension of the n…
CLEAR: Survey Overview, Data Analysis, and Products
Papovich, Casey; Finkelstein, Steven L.; Cleri, Nikko J. +19 more
We present an overview of the CANDELS Lyα Emission At Reionization (CLEAR) survey. CLEAR is a 130 orbit program of the Hubble Space Telescope using the Wide Field Camera 3 (WFC3) IR G102 grism. CLEAR targets 12 pointings divided between the GOODS-N and GOODS-S fields of the Cosmic Assembly Near-IR Deep Extragalactic Legacy Survey (CANDELS). Combin…
New compact hierarchical triple system candidates identified using Gaia DR3
Mitnyan, T.; Pál, A.; Borkovits, T. +5 more
Aims: We introduce a novel way to identify new compact hierarchical triple stars by exploiting the huge potential of Gaia DR3 and also its future data releases. We aim to increase the current number of compact hierarchical triple systems significantly.
Methods: We used several eclipsing binary catalogs from different sky surveys that lis…
JWST Peers into the Class I Protostar TMC1A: Atomic Jet and Spatially Resolved Dissociative Shock Region
Pontoppidan, K. M.; Bjerkeli, P.; Kristensen, L. E. +6 more
Outflows and winds launched from young stars play a crucial role in the evolution of protostars and the early stages of planet formation. However, the specific details of the mechanism behind these phenomena, including how they affect the protoplanetary disk structure, are still debated. We present JWST NIRSpec integral field unit observations of …
Giant Planet Engulfment by Evolved Giant Stars: Light Curves, Asteroseismology, and Survivability
Bildsten, Lars; Cantiello, Matteo; O'Connor, Christopher E. +1 more
About ten percent of Sun-like (1-2 M ⊙) stars will engulf a 1-10 M J planet as they expand during the red giant branch (RGB) or asymptotic giant branch (AGB) phase of their evolution. Once engulfed, these planets experience a strong drag force in the star's convective envelope and spiral inward, depositing energy and angular …
The radio emission in radio-quiet quasars: the VLBA perspective
Gelfand, Joseph D.; Laor, Ari; Behar, Ehud +2 more
The origin of the radio emission in radio-quiet quasars (RQQ) is not established yet. We present new VLBA observations at 1.6 and 4.9 GHz of 10 RQQ (9 detected), which together with published earlier observations of 8 RQQ (5 detected), forms a representative sample of 18 RQQ drawn from the Palomar-Green sample of low z (< 0.5) AGN. The spectral…
Exoplanet spectroscopy with JWST NIRISS: diagnostics and case studies
Madhusudhan, Nikku; Holmberg, Måns
The JWST is ushering in a new era in remote sensing of exoplanetary atmospheres. Atmospheric retrievals of exoplanets can be highly sensitive to high-precision JWST data. It is, therefore, imperative to characterize the instruments and noise sources using early observations to enable robust characterization of exoplanetary atmospheres using JWST-q…