Search Publications
An Edge-on Regular Disk Galaxy at z = 5.289
Yan, Haojing; Ling, Chenxiaoji; Sun, Bangzheng
While rotation-supported gas disks are known to exist as early as at z ≈ 7, it is still a general belief that stellar disks form late in the Universe. This picture is now being challenged by the observations from the James Webb Space Telescope (JWST), which have revealed a large number of disk-like galaxies that could be at z > 3, with some bei…
The Timescales of Star Cluster Emergence: The Case of NGC 4449
Smith, Linda J.; Calzetti, Daniela; Johnson, Kelsey E. +7 more
We survey the young star cluster population in the dwarf galaxy NGC 4449 with the goal of investigating how stellar feedback may depend on the clusters' properties. Using ultraviolet (UV)–optical–near-infrared photometry obtained with the Hubble Space Telescope, we have recovered 99 compact sources exhibiting emission in the Paβ hydrogen recombina…
Pseudo-Drag-Free System Simulation for Bepicolombo Radio Science Using Accelerometer Data
Cappuccio, Paolo; di Stefano, Ivan; Iess, Luciano +6 more
The Mercury Orbiter Radio Science Experiment onboard the European Space Agency/Japan Aerospace Exploration Agency (JAXA) BepiColombo mission aims at determining the gravity field and the rotational state of the planet to provide insight into its internal structure and at performing tests of general relativity. The experiment will rely on accurate …
A disc wind origin for the optical spectra of dwarf novae in outburst
Long, Knox S.; Tampo, Yusuke; Knigge, Christian +2 more
Many high-state cataclysmic variables (CVs) exhibit blue-shifted absorption features in their ultraviolet (UV) spectra - a smoking-gun signature of outflows. However, the impact of these outflows on optical spectra remains much more uncertain. During its recent outburst, the eclipsing dwarf nova V455 And displayed strong optical emission lines who…
A newborn active galactic nucleus in a star-forming galaxy
Salvato, M.; Merloni, A.; Arévalo, P. +8 more
Aims: We report on the finding of a newborn active galactic nucleus (AGN), based on the observation of current AGN activity in a galaxy previously classified as non-active. We subsequently characterize the AGN's evolution.
Methods: Black hole ignition event candidates were selected from a parent sample of spectrally classified non-active…
WFC3 Infrared Spectroscopic Parallel (WISP) survey: photometric and emission-line data release
Malkan, M. A.; Wang, X.; Shahinyan, K. +21 more
We present reduced images and catalogues of photometric and emission-line data (~230 000 and ~8000 sources, respectively) for the WFC3 (Wide Field Camera 3) Infrared Spectroscopic Parallel (WISP) survey. These data are made publicly available on the Mikulski Archive for Space Telescopes and include reduced images from various facilities: ground-ba…
Assessing the capability of a model-based stellar XUV estimation
Namekata, Kosuke; Takasao, Shinsuke; Shoda, Munehito
Stellar X-ray and extreme ultraviolet (XUV) emission drives the heating and chemical reactions in planetary atmospheres and proto-planetary disks, and therefore, a proper estimation of a stellar XUV spectrum is required for their studies. One proposed solution is to estimate stellar atmospheric heating using numerical models, although the validati…
TOI-2015 b: A Warm Neptune with Transit Timing Variations Orbiting an Active Mid-type M Dwarf
Kobulnicky, Henry A.; Hawley, Suzanne L.; Cochran, William D. +29 more
We report the discovery of a close-in (P orb = 3.349 days) warm Neptune with clear transit timing variations (TTVs) orbiting the nearby (d = 47.3 pc) active M4 star, TOI-2015. We characterize the planet's properties using Transiting Exoplanet Survey Satellite (TESS) photometry, precise near-infrared radial velocities (RVs) with the Habi…
Hemispheric Distribution of Halo Coronal Mass Ejection Source Locations
Mei, Ying; Wang, Feng; Deng, Hui +2 more
The hemispheric asymmetry of solar activity is one of the essential physical consequences of the interior dynamo process. However, the hemispheric distribution of halo coronal mass ejection (HCME) source locations has not been investigated in detail. Based on the HCME catalog identified from the Large Angle and Spectrometric Coronagraph Experiment…
JWST-TST High Contrast: Spectroscopic Characterization of the Benchmark Brown Dwarf HD 19467 B with the NIRSpec Integral Field Spectrograph
van der Marel, Roeland P.; Perrin, Marshall D.; Pueyo, Laurent +14 more
We present the atmospheric characterization of the substellar companion HD 19467 B as part of the pioneering James Webb Space Telescope Guaranteed Time Observer program to obtain moderate resolution spectra (R ∼ 2700, 3–5 µm) of a high-contrast companion with the NIRSpec integral field unit (IFU). HD 19467 B is an old, ∼9 Gyr, companion to a…