Search Publications
Missions
Journals
Publication Years
JWST/NIRSpec Observations of the Planetary Mass Companion TWA 27B
Luhman, K. L.; Birkmann, S. M.; Tremblin, P. +8 more
We present 1-5 µm spectroscopy of the young planetary mass companion TWA 27B (2M1207B) performed with NIRSpec on board the James Webb Space Telescope. In these data, the fundamental band of CH4 is absent, and the fundamental band of CO is weak. The nondetection of CH4 reinforces a previously observed trend of weaker CH<…
The Radial Variation of the Solar Wind Turbulence Spectra near the Kinetic Break Scale from Parker Solar Probe Measurements
Bale, S. D.; Kontar, E. P.; Engelbrecht, N. E. +7 more
In this study we examine the radial dependence of the inertial and dissipation range indices, as well as the spectral break separating the inertial and dissipation range in power density spectra of interplanetary magnetic field fluctuations using Parker Solar Probe data from the fifth solar encounter between ~0.1 and ~0.7 au. The derived break wav…
Water Absorption in the Transmission Spectrum of the Water World Candidate GJ 9827 d
Fortney, Jonathan J.; Mikal-Evans, Thomas; Lothringer, Joshua D. +16 more
Recent work on the characterization of small exoplanets has allowed us to accumulate growing evidence that sub-Neptunes with radii greater than ~2.5 R ⊕ often host H2/He-dominated atmospheres both from measurements of their low bulk densities and from direct detections of their low mean molecular mass atmospheres. However, th…
Particle Acceleration by Magnetic Reconnection in Geospace
Khotyaintsev, Yuri; Drake, James F.; Oka, Mitsuo +7 more
Particles are accelerated to very high, non-thermal energies during explosive energy-release phenomena in space, solar, and astrophysical plasma environments. While it has been established that magnetic reconnection plays an important role in the dynamics of Earth's magnetosphere, it remains unclear how magnetic reconnection can further explain pa…
The Interaction between AGN and Starburst Activity in the Circumnuclear Region of NGC 7469 as Viewed with JWST
Ho, Luis C.; Zhang, Lulu
We combine mid-infrared diagnostics obtained from integral-field-unit observations taken with Mid-Infrared Instrument/Medium Resolution Spectrograph on the James Webb Space Telescope with cold molecular gas information derived from Atacama Large Millimeter/submillimeter Array observations of CO(1-0) emission to investigate the star formation rate …
Improving Star Cluster Age Estimates in PHANGS-HST Galaxies and the Impact on Cluster Demographics in NGC 628
Kruijssen, J. M. Diederik; Klessen, Ralf S.; Schinnerer, Eva +29 more
A long-standing problem when deriving the physical properties of stellar populations is the degeneracy between age, reddening, and metallicity. When a single metallicity is used for all the star clusters in a galaxy, this degeneracy can result in 'catastrophic' errors for old globular clusters. Typically, approximately 10-20 per cent of all cluste…
Empirical constraints on the turbulence in QSO host nebulae from velocity structure function measurements
Johnson, Sean D.; Zahedy, Fakhri S.; Chen, Hsiao-Wen +9 more
We present the first empirical constraints on the turbulent velocity field of the diffuse circumgalactic medium around four luminous quasi-stellar objects (QSOs) at z ≈ 0.5-1.1. Spatially extended nebulae of ≈50-100 physical kpc in diameter centred on the QSOs are revealed in [O II] $\lambda \lambda \, 3727,3729$ and/or [O III] $\lambda \, 5008$ e…
VLA Legacy Survey of Molecular Gas in Massive Star-forming Galaxies at High Redshift
Ivison, R. J.; Smail, Ian; Jiménez-Andrade, E. F. +18 more
We present the initial results of an ongoing survey with the Karl G. Jansky Very Large Array targeting the CO(J = 1-0) transition in a sample of 30 submillimeter-selected, dusty star-forming galaxies (SFGs) at z = 2-5 with existing mid-J CO detections from the Atacama Large Millimeter/submillimeter Array and NOrthern Extended Millimeter Array, of …
Detection of Carbon Monoxide in the Atmosphere of WASP-39b Applying Standard Cross-correlation Techniques to JWST NIRSpec G395H Data
Stevenson, Kevin B.; Kirk, James; López-Morales, Mercedes +30 more
Carbon monoxide was recently reported in the atmosphere of the hot Jupiter WASP-39b using the NIRSpec PRISM transit observation of this planet, collected as part of the JWST Transiting Exoplanet Community Early Release Science Program. This detection, however, could not be confidently confirmed in the initial analysis of the higher-resolution obse…
Analytical weak-lensing shear responses of galaxy properties and galaxy detection
Mandelbaum, Rachel; Li, Xiangchong
Shear estimation bias from galaxy detection and blending identification is now recognized as an issue for ongoing and future weak-lensing surveys. Currently, the empirical approach to correcting for this bias involves numerically shearing every observed galaxy and rerunning the detection and selection process. In this work, we provide an analytica…