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Star Formation and Molecular Gas Diagnostics with Mid- and Far-infrared Emission
Leroy, A.; Smith, J. -D. T.; Sandstrom, K. +1 more
With the start of JWST observations, mid-infrared (MIR) emission features from polycyclic aromatic hydrocarbons (PAHs), H2 rotational lines, fine structure lines from ions, and dust continuum will be widely available tracers of gas and star formation rate (SFR) in galaxies at various redshifts. Many of these tracers originate from dust …
A search for compact object companions to high mass function single-lined spectroscopic binaries in Gaia DR3
Kochanek, C. S.; Stanek, K. Z.; Thompson, Todd A. +2 more
Gaia Data Release 3 (DR3) provides >181 000 radial velocity (RV) solutions for single-lined spectroscopic binaries (SB1s) that can be used to search for non-interacting compact object + star binary candidates by selecting systems with large mass functions. We selected 234 such systems and identified 115 systems with good RV solutions in DR3. We…
Photochemical Hazes Dramatically Alter Temperature Structure and Atmospheric Circulation in 3D Simulations of Hot Jupiters
Kreidberg, Laura; Parmentier, Vivien; Zhang, Xi +5 more
Photochemical hazes are expected to form in hot Jupiter atmospheres and may explain the strong scattering slopes and muted spectral features observed in the transmission spectra of many hot Jupiters. Absorption and scattering by photochemical hazes have the potential to drastically alter temperature structure and atmospheric circulation of these p…
Nature and Nurture? Comparing Lyα Detections in UV-bright and Fainter [O III]+Hβ Emitters at z 8 with Keck/MOSFIRE
Santini, Paola; Fontana, Adriano; Treu, Tommaso +7 more
The 100% detection rate of Lyα emission in a sample of four luminous z ~ 8 galaxies with red Spitzer/IRAC colors suggests objects with unusual ionizing capabilities that created early ionized bubbles in a neutral era. Whether such bubbles reflect enhanced ionizing properties (nature) or an overdense environment (nurture), however, remains unclear.…
Constraints on the cosmological coupling of black holes from Gaia
El-Badry, Kareem; Andrae, René
Recent work has suggested that black holes (BHs) could be cosmologically coupled to the accelerated expansion of the Universe, potentially becoming a candidate for origin of dark energy. This would imply that BH mass growth follows cosmological expansion, with the masses of individual BHs growing as MBH ∝ (1 + z)3. In this Le…
Venus Evolution Through Time: Key Science Questions, Selected Mission Concepts and Future Investigations
Korablev, Oleg; Marcq, Emmanuel; Hensley, Scott +42 more
In this work we discuss various selected mission concepts addressing Venus evolution through time. More specifically, we address investigations and payload instrument concepts supporting scientific goals and open questions presented in the companion articles of this volume. Also included are their related investigations (observations & modelin…
The SNAD Viewer: Everything You Want to Know about Your Favorite ZTF Object
Ishida, Emille E. O.; Krone-Martins, Alberto; Volnova, Alina A. +9 more
We describe the SNAD Viewer, a web portal for astronomers which presents a centralized view of individual objects from the Zwicky Transient Facility's (ZTF) data releases, including data gathered from multiple publicly available astronomical archives and data sources. Initially built to enable efficient expert feedback in the context of adaptive m…
JWST's PEARLS: Bright 1.5-2.0 µm Dropouts in the Spitzer/IRAC Dark Field
Grogin, Norman A.; Hathi, Nimish P.; Pirzkal, Nor +35 more
Using the first epoch of four-band NIRCam observations obtained by the James Webb Space Telescope (JWST) Prime Extragalactic Areas for Reionization and Lensing Science Program in the Spitzer IRAC Dark Field, we search for F150W and F200W dropouts. In 14.2 arcmin2, we have found eight F150W dropouts and eight F200W dropouts, all brighter…
A High-resolution Optical Survey of Upper Sco: Evidence for Coevolution of Accretion and Disk Winds
Fang, Min; Pascucci, Ilaria; Edwards, Suzan +3 more
Magnetohydrodynamic (MHD) and photoevaporative winds are thought to play an important role in the evolution and dispersal of planet-forming disks. Here, we analyze high-resolution (Δv ~ 7 km s-1) optical spectra from a sample of 115 T Tauri stars in the ~5-10 Myr Upper Sco association and focus on the [O I] λ6300 and Hα lines to trace d…
A prescription for the asteroseismic surface correction
Li, Yaguang; Huber, Daniel; Bedding, Timothy R. +11 more
In asteroseismology, the surface effect refers to a disparity between the observed and the modelled frequencies in stars with solar-like oscillations. It originates from improper modelling of the surface layers. Correcting the surface effect usually requires using functions with free parameters, which are conventionally fitted to the observed freq…