Search Publications
Revealing Potential Initial Mass Function Variations with Metallicity: JWST Observations of Young Open Clusters in a Low-metallicity Environment
Kobayashi, Naoto; Lau, Ryan M.; Izumi, Natsuko +3 more
We present the substellar mass function of star-forming clusters (≃0.1 Myr old) in a low-metallicity environment (≃‑0.7 dex). We performed deep JWST/NIRCam and MIRI imaging of two star-forming clusters in Digel Cloud 2, a star-forming region in the outer Galaxy (R G ≳ 15 kpc). The very high sensitivity and spatial resolution of JWST e…
On the dust properties of the UV galaxies in the redshift range z 0.6-1.2
Page, M. J.; Symeonidis, M.; Ferreras, I. +1 more
Far-infrared observations from the Herschel Space Observatory are used to estimate the infrared (IR) properties of ultraviolet-selected galaxies. We stack the PACS (100, 160 $\mu$m) and SPIRE (250, 350, and 500 $\mu$m) maps of the Chandra deep field south (CDFS) on a source list of galaxies selected in the rest-frame ultraviolet (UV) in a redshift…
Resolving Clumpy versus Extended Lyα in Strongly Lensed, High-redshift Lyα Emitters
Shibuya, Takatoshi; Florian, Michael; Sharon, Keren +10 more
We present six strongly gravitationally lensed Lyα emitters (LAEs) at z ∼ 4–5 with Hubble Space Telescope (HST) narrowband imaging isolating Lyα. Through complex radiative transfer Lyα encodes information about the spatial distribution and kinematics of the neutral hydrogen upon which it scatters. We investigate the galaxy properties and Lyα morph…
Latitudinal Asymmetry in the Dayside Atmosphere of WASP-43b
Sing, David K.; Valenti, Jeff A.; Rustamkulov, Zafar +9 more
We present two-dimensional near-infrared temperature maps of the canonical hot Jupiter WASP-43b using a phase-curve observation with JWST NIRSpec/G395H. From the white-light planetary transit, we improve constraints on the planet's orbital parameters and measure a planet-to-star radius ratio of
An Empirical Sample of Spectra of M-type Stars with Homogeneous Atmospheric-parameter Labels
Luo, A. -Li; Kong, Xiao; Li, Yinbi +6 more
The discrepancies between theoretical and observed spectra, and the systematic differences between various spectroscopic parameter estimates, complicate the determination of atmospheric parameters of M-type stars. In this work, we present an empirical sample of 5105 M-type star spectra with homogeneous atmospheric parameter labels through stellar-…
Resolving Twin Jets and Twin Disks with JWST and ALMA: The Young WL 20 Multiple System
Le Gouellec, Valentin J. M.; Ressler, Michael E.; Tychoniec, Łukasz +2 more
We report the discovery of jets emanating from pre-main-sequence objects exclusively at mid-infrared wavelengths, enabled by the superb sensitivity of JWST's Mid-Infrared Instrument Medium-Resolution Spectrometer. These jets are observed only in lines of [Ni II], [Fe II], [Ar II], and [Ne II]. The H2 emission, imaged in eight distinct t…
Effects of the 2007 Martian Global Dust Storm on Boundary Positions in the Induced Magnetosphere
Holmström, Mats; Coates, Andrew J.; Frahm, Rudy A. +8 more
Mars's magnetosphere is a sensitive system, varying due to external and internal factors, such as solar wind conditions and crustal magnetic fields. A signature of this influence can be seen in the position of two boundaries; the bow shock and the induced magnetospheric boundary (IMB). The bow shock moves closer to Mars during times of high solar …
Model-independent reconstruction of UV luminosity function and reionization epoch
Hazra, Dhiraj Kumar; Adak, Debabrata; Mitra, Sourav +1 more
We conduct a first comprehensive study of the Luminosity Function (LF) using a non-parametric approach. We use Gaussian Process to fit available luminosity data between redshifts z ∼ 2-8. Our free-form LF in the non-parametric approach rules out the conventional Schechter function model to describe the abundance-magnitude relation at redshifts z=3…
Structure and large-scale environment of galaxy pairs in the S-PLUS DR4
Schoenell, W.; Kanaan, A.; Ribeiro, T. +8 more
In this paper, we use photometric data from the Southern Photometric Local Universe Survey Data Release 4 survey to identify isolated galaxy pairs and analyse their characteristics and properties. Our results align with previous spectroscopic studies, particularly in luminosity function parameters, suggesting a consistent trait among galaxy system…
Predicting astrometric microlensing events from Gaia Data Release 3
Su, Jie; Wang, Jiancheng; Zhang, Yigong +2 more
Currently, astrometric microlensing is the only tool that can directly measure the mass of a single star; it can also help us to detect compact objects such as isolated neutron stars and black holes. The number of microlensing events that are being predicted and reported is increasing. In this paper, potential lens stars are selected from three ty…