Results 21 to 30 of about 2,651 (210)

A Census of Near-UV M-dwarf Flares Using Archival GALEX Data and the gPHOTON2 Pipeline

open access: yesThe Astrophysical Journal, 2023
M-dwarfs are common stellar hosts of habitable-zone exoplanets. Near-UV (NUV) radiation can severely impact the atmospheric and surface conditions of such planets, making the characterization of NUV flaring activity a key aspect in determining ...
Param Rekhi   +3 more
doaj   +1 more source

Far-ultraviolet to Near-infrared Observations of SN 2023ixf: A High-energy Explosion Engulfed in Complex Circumstellar Material

open access: yesThe Astrophysical Journal Letters, 2023
We present early-phase panchromatic photometric and spectroscopic coverage spanning the far-ultraviolet to near-infrared regime of the nearest hydrogen-rich core-collapse supernova (SN) in the last 25 yr, SN 2023ixf.
Rishabh Singh Teja   +15 more
doaj   +1 more source

CUTE Reveals Escaping Metals in the Upper Atmosphere of the Ultrahot Jupiter WASP-189b

open access: yesThe Astrophysical Journal Letters, 2023
Ultraviolet observations of ultrahot Jupiters, exoplanets with temperatures over 2000 K, provide us with an opportunity to investigate if and how atmospheric escape shapes their upper atmosphere. Near-ultraviolet transit spectroscopy offers a unique tool
A. G. Sreejith   +14 more
doaj   +1 more source

A possible bright ultraviolet flash from a galaxy at redshift z ≈ 11 [PDF]

open access: yes, 2021
In the optical sky, minutes-duration transients from cosmological distances are rare. Known objects that give rise to such transients include gamma-ray bursts (GRBs), the most luminous explosions in the Universe1 that have been detected at redshifts as ...
Jiang, Linhua   +10 more
core   +1 more source

The effect of the impact of comet Shoemaker Levy‐9 on Jupiter's aurorae [PDF]

open access: yes, 1995
We present infrared spectra and images of the jovian aurorae taken at wavelengths sensitive to the H-3(+) molecular ion during the period around the impact of Comet Shoemaker Levy-9.
Tennyson, J.   +25 more
core   +1 more source

Galaxy and mass assembly (GAMA) : end of survey report and data release 2 [PDF]

open access: yes, 2015
The Galaxy And Mass Assembly (GAMA) survey is one of the largest contemporary spectroscopic surveys of low redshift galaxies. Covering an area of ~286 deg2 (split among five survey regions) down to a limiting magnitude of r
Loveday, J   +284 more
core   +1 more source

Core-collapse Supernova Explosions in Active Galactic Nucleus Accretion Disks

open access: yesThe Astrophysical Journal, 2023
Astrophysical events that occur in active galactic nucleus (AGN) disks are believed to differ significantly from the ordinary in the interstellar medium.
Fu-Lin Li   +6 more
doaj   +1 more source

Initial results from the near-ultraviolet survey of Col-OSSOS trans-Neptunian objects [PDF]

open access: yes, 2021
International audienceThe outer Solar System contains trillions of small objects made of ice and rock; yet, few have been explored in near-ultraviolet wavelengths.
Alexandersen, Mike   +18 more
core   +4 more sources

The On-orbit Performance of the Colorado Ultraviolet Transit Experiment Mission

open access: yesThe Astronomical Journal, 2023
We present the on-orbit performance of the Colorado Ultraviolet Transit Experiment (CUTE). CUTE is a 6U CubeSat that launched on 2021 September 27 and is obtaining near-ultraviolet (NUV; 2480 Å-3306 Å) transit spectroscopy of short-period exoplanets. The
Arika Egan   +7 more
doaj   +1 more source

A database of synthetic photometry in the GALEX ultraviolet bands for the stellar sources observed with the International Ultraviolet Explorer [PDF]

open access: yes, 2023
The Galaxy Evolution Explorer (GALEX) has produced the largest photometric catalogue of ultraviolet (UV) sources. As such, it has defined the new standard bands for UV photometry: the near UV band (NUV) and the far UV band (FUV).
Gómez De Castro, Ana Inés   +1 more
core   +1 more source

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