Results 81 to 90 of about 2,784 (183)

A JWST Survey of the Supernova Remnant Cassiopeia A

The Astrophysical Journal Letters
Abstract We present initial results from a James Webb Space Telescope (JWST) survey of the youngest Galactic core-collapse supernova remnant, Cassiopeia A (Cas A), made up of NIRCam and MIRI imaging mosaics that map emission from the main shell, interior, and surrounding circumstellar/interstellar material (CSM/ISM). We also present four
Dan Milisavljevic, Tea Temim, Ilse De Looze, Danielle Dickinson, J. Martin Laming, Robert Fesen, John C. Raymond, Richard G. Arendt, Jacco Vink, Bettina Posselt, George G. Pavlov, Ori D. Fox, Ethan Pinarski, Bhagya Subrayan, Judy Schmidt, William P. Blair, Armin Rest, Daniel Patnaude, Bon-Chul Koo, Jeonghee Rho, Salvatore Orlando, Hans-Thomas Janka, Moira Andrews, Michael J. Barlow, Adam Burrows, Roger Chevalier, Geoffrey Clayton, Claes Fransson, Christopher Fryer, Haley L. Gomez, Florian Kirchschlager, Jae-Joon Lee, Mikako Matsuura, Maria Niculescu-Duvaz, Justin D. R. Pierel, Paul P. Plucinsky, Felix D. Priestley, Aravind P. Ravi, Nina S. Sartorio, Franziska Schmidt, Melissa Shahbandeh, Patrick Slane, Nathan Smith, Niharika Sravan, Kathryn Weil, Roger Wesson, J. Craig Wheeler   +46 more
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A Single Power Law for the TRAPPIST-1 Flare Distribution across 4 Orders of Magnitude in Energy

The Astrophysical Journal Letters
TRAPPIST-1 is an ultracool dwarf that flares frequently. These flares shape the surrounding planets’ high-energy irradiation environment, with consequences for atmospheric chemistry and escape, and they can contaminate transmission spectroscopy of those ...
Valeriy Vasilyev, Alexander I. Shapiro, Nadiia Kostogryz, Chia-Lung Lin, Greg Kopp, Benjamin V. Rackham, Astrid M. Veronig, Olivia Lim, Julien de Wit, Daniel Apai, Laurent Gizon, Sami K. Solanki, Sara Seager   +12 more
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The JWST and standard cosmology

International Journal of Modern Physics D
Recent observations from the James Webb Space Telescope have identified a population of massive galaxy sources ([Formula: see text]) at [Formula: see text]–10, formed less than 700[Formula: see text]Myr after the Big Bang. Such massive galaxies do not have enough time to form within the standard cosmological model, and hence these observations pose a ...
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A MIRI Search for Planets and Dust around WD 2149+021

The Astronomical Journal
The launch of JWST has ushered in a new era of high-precision infrared astronomy, allowing us to probe nearby white dwarfs for cold dust, exoplanets, and tidally heated exomoons.
Sabrina Poulsen, John Debes, Misty Cracraft, Susan E. Mullally, William T. Reach, Mukremin Kilic, Fergal Mullally, Loic Albert, Katherine Thibault, J. J. Hermes, Thomas Barclay, Elisa V. Quintana   +11 more
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Improved Empirical Backgrounds for JWST NIRISS Image/Wide-field Slitless Spectroscopy Data Reduction

The Astronomical Journal
The Near Infrared Imager and Slitless Spectrograph (NIRISS) on the James Webb Space Telescope (JWST) is a versatile instrument for collecting imaging and wide-field slitless spectroscopy (WFSS) data for surveys of galaxy clusters, emission-line galaxies,
Raphael E. Hviding, Ivelina G. Momcheva, Leonardo Clarke   +2 more
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Life, the Universe and JWST [PDF]

Nature Astronomy, 2022
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JWST-TST High Contrast: JWST/NIRCam Observations of the Young Giant Planet β Pic b

The Astronomical Journal
Abstract We present the first JWST/NIRCam observations of the directly imaged gas giant exoplanet β Pic b. Observations in six filters using NIRCam's round coronagraphic masks provide a high-signal-to-noise-ratio detection of β Pic b and the archetypal debris disk around β Pic over a wavelength range of ∼1.7–5 μm.
Jens Kammerer, Kellen Lawson, Marshall D. Perrin, Isabel Rebollido, Christopher C. Stark, Tomas Stolker, Julien H. Girard, Laurent Pueyo, William O. Balmer, Kadin Worthen, Christine Chen, Roeland P. van der Marel, Nikole K. Lewis, Kimberly Ward-Duong, Jeff A. Valenti, Mark Clampin, C. Matt Mountain   +16 more
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The JWST Advanced Deep Extragalactic Survey: Discovery of an Extreme Galaxy Overdensity at z = 5.4 with JWST/NIRCam in GOODS-S

The Astrophysical Journal
We report the discovery of an extreme galaxy overdensity at z = 5.4 in the GOODS-S field using James Webb Space Telescope (JWST)/NIRCam imaging from JADES and JEMS alongside JWST/NIRCam wide-field slitless spectroscopy from FRESCO.
Jakob M. Helton, Fengwu Sun, Charity Woodrum, Kevin N. Hainline, Christopher N. A. Willmer, George H. Rieke, Marcia J. Rieke, Sandro Tacchella, Brant Robertson, Benjamin D. Johnson, Stacey Alberts, Daniel J. Eisenstein, Ryan Hausen, Nina R. Bonaventura, Andrew Bunker, Stephane Charlot, Mirko Curti, Emma Curtis-Lake, Tobias J. Looser, Roberto Maiolino, Chris Willott, Joris Witstok, Kristan Boyett, Zuyi Chen, Eiichi Egami, Ryan Endsley, Raphael E. Hviding, Daniel T. Jaffe, Zhiyuan Ji, Jianwei Lyu, Lester Sandles   +30 more
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Investigating the Electron-capture Supernova Candidate AT 2019abn with JWST Spectroscopy

The Astrophysical Journal Letters
The James Webb Space Telescope (JWST) has opened up a new window to study highly reddened explosive transients. We present results from late-time JWST follow-up spectroscopic observations with NIRSpec and MIRI-LRS of the intermediate-luminosity red ...
Sam Rose, Ryan M. Lau, Jacob E. Jencson, Mansi M. Kasliwal, Kishalay De, Michael E. Ressler, Ori D. Fox, Matthew J. Hankins   +7 more
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JWST MIRI flight performance: Imaging

Astronomy & Astrophysics
The Mid-Infrared Instrument (MIRI) aboard the James Webb Space Telescope (JWST) provides the observatory with a huge advance in mid-infrared imaging and spectroscopy covering the wavelength range of 5–28 µm. This paper describes the performance and characteristics of the MIRI imager as understood during observatory commissioning activities, and through
Dan Dicken, Macarena García Marín, Irene Shivaei, Pierre Guillard, Mattia Libralato, Alistair Glasse, Karl D. Gordon, Christophe Cossou, Patrick Kavanagh, Tea Temim, Nicolas Flagey, Pamela Klaassen, George H. Rieke, Gillian Wright, Stacey Alberts, Ruyman Azzollini, Javier Álvarez-Márquez, Patrice Bouchet, Stacey Bright, Misty Cracraft, Alain Coulais, Ors Hunor Detre, Mike Engesser, Ori D. Fox, Andras Gaspar, René Gastaud, Adrian M. Glauser, Dean C. Hines, Sarah Kendrew, Alvaro Labiano, Pierre-Oliver Lagage, David Lee, David R. Law, Jane E. Morrison, Alberto Noriega-Crespo, Olivia Jones, Polychronis Patapis, Silvia Scheithauer, G. C. Sloan, Laszlo Tamas   +39 more
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