Results 81 to 90 of about 6,508 (165)

Mapping Atmospheric Features of the Planetary-mass Brown Dwarf SIMP 0136 with JWST NIRISS

The Astrophysical Journal
In this paper, we analyze James Webb Space Telescope Near-Infrared Imager and Slitless Spectrograph time-series spectroscopy data to characterize the atmosphere of the planetary-mass brown dwarf SIMP J01365662+093347. Principal component analysis reveals
Roman Akhmetshyn, Étienne Artigau, Nicolas B. Cowan, Michael K. Plummer, Fei Wang, Ben Burningham, Björn Benneke, René Doyon, Ray Jayawardhana, David Lafrenière, Stanimir A. Metchev, Jason F. Rowe   +11 more
doaj   +1 more source

Mapping the Cloud-driven Atmospheric Dynamics and Chemistry of an Isolated Exoplanet Analog with Harmonic Signatures

The Astronomical Journal
Young planetary-mass objects and brown dwarfs near the L–T spectral transition exhibit enhanced spectrophotometric variability over field brown dwarfs. Patchy clouds, auroral processes, stratospheric hot spots, and complex carbon chemistry have all been ...
Michael K. Plummer, Francis P. Cocchini, Peter A. Kearns, Allison M. McCarthy, Étienne Artigau, Nicolas B. Cowan, Roman Akhmetshyn, Johanna M. Vos, Evert Nasedkin, Channon Visscher, Björn Benneke, René Doyon, Stanimir A. Metchev, Jason F. Rowe, Genaro Suárez   +14 more
doaj   +1 more source

Is the Atmosphere of the Ultra-hot Jupiter WASP-121 b Variable?

The Astrophysical Journal Supplement Series
We present a comprehensive analysis of the Hubble Space Telescope observations of the atmosphere of WASP-121 b, an ultra-hot Jupiter. After reducing the transit, eclipse, and phase-curve observations with a uniform methodology and addressing the biases ...
Q. Changeat, J. W. Skinner, J. Y-K. Cho, J. Nättilä, I. P. Waldmann, A. F. Al-Refaie, A. Dyrek, B. Edwards, T. Mikal-Evans, M. Joshua, G. Morello, N. Skaf, A. Tsiaras, O. Venot, K. H. Yip   +14 more
doaj   +1 more source

World-leading science with SPIRou - the nIR spectropolarimeter / high-precision velocimeter for CFHT

, 2013
SPIRou is a near-infrared (nIR) spectropolarimeter / velocimeter proposed as a new-generation instrument for CFHT. SPIRou aims in particular at becoming world-leader on two forefront science topics, (i) the quest for habitable Earth-like planets around ...
Alencar, S. H. P., Artigau, E., Boisse, I., Bonfils, X., Bouchy, F., Bouvier, J., Brun, A. S., Castilho, B. V., Delfosse, X., Donati, J. -F., Doyon, R., Figueira, P., Hennebelle, P., Hébrard, G., Kouach, D., Martioli, E., Morin, J., Moutou, C., Nascimento, J. -D. do, Pepe, F., Santos, N. C., Team, the SPIRou Science, Udry, S., Wang, S. Y., Widemann, T.   +24 more
core   +1 more source

Three Years of High-contrast Imaging of the PDS 70 b and c Exoplanets at Hα with MagAO-X: Evidence of Strong Protoplanet Hα Variability and Circumplanetary Dust

The Astronomical Journal
We present 3 yr of high-contrast imaging of the PDS 70 b and c accreting protoplanets with the new extreme AO system MagAO-X as part of the MaxProtoPlanetS survey of H α protoplanets.
Laird M. Close, Jared R. Males, Jialin Li, Sebastiaan Y. Haffert, Joseph D. Long, Alexander D. Hedglen, Alycia J. Weinberger, Katherine B. Follette, Daniel Apai, Rene Doyon, Warren Foster, Victor Gasho, Kyle Van Gorkom, Olivier Guyon, Maggie Y. Kautz, Jay Kueny, Jennifer Lumbres, Avalon McLeod, Eden McEwen, Clarissa Pavao, Logan Pearce, Laura Perez, Lauren Schatz, Judit Szulágyi, Kevin Wagner, Ya-Lin Wu   +25 more
doaj   +1 more source

The single beacon: progresses in understanding Earth as an exoplanet using DSCOVR/EPIC observations

Frontiers in Remote Sensing
Almost 6000 exoplanets have thus far been confirmed, revolutionizing our understanding of planetary habitability. Yet, despite the identification of Earth-like exoplanets, definitive evidence of extraterrestrial life remains elusive.
Xun Jian, Xun Jian, Lixiang Gu, Siteng Fan, Stuart J. Bartlett, Jiani Yang, Jonathan H. Jiang, Yangcheng Luo, Yuk L. Yung, Yuk L. Yung   +9 more
doaj   +1 more source

Far-ultraviolet Flares and Variability of the Young M Dwarf AU Mic: A Nondetection of Planet C in Transit at Lyα

The Astronomical Journal
Atmospheric escape’s potential to shape the exoplanet population motivates detailed observations of systems actively undergoing escape. AU Mic is a young and active M dwarf hosting two close-in transiting sub- to Neptune-sized planets. Atmospheric escape
Keighley E. Rockcliffe, Elisabeth R. Newton, Allison Youngblood, Girish M. Duvvuri, Emily A. Gilbert, Peter Plavchan, Peter Gao, Hans-R. Müller, Adina D. Feinstein, Thomas Barclay, Eric D. Lopez   +10 more
doaj   +1 more source

Planetary Rhythms: Synchronous Circulation on Variably Irradiated Asynchronous Planets

The Astrophysical Journal
Tidal locking of planets to their host stars results in an atmospheric circulation with a hotspot fixed to the frame of reference of the planet. On the other hand, asynchronously rotating planets feature moving hotspots either lagging or leading the ...
Deepayan Banik
doaj   +1 more source

Detecting Atmospheric CO2 Trends as Population-level Signatures for Long-term Stable Water Oceans and Biotic Activity on Temperate Terrestrial Exoplanets

The Astrophysical Journal
Identifying key observables is essential for enhancing our knowledge of exoplanet habitability and biospheres, as well as improving future mission capabilities.
Janina Hansen, Daniel Angerhausen, Sascha P. Quanz, Derek Vance, Björn S. Konrad, Emily O. Garvin, Eleonora Alei, Jens Kammerer, Felix A. Dannert   +8 more
doaj   +1 more source

Observing spatial and temporal variations in the atmospheric chemistry of rocky exoplanets: Prospects for mid-infrared spectroscopy

Astronomy & Astrophysics
Context. Future telescopes such as the Large Interferometer For Exoplanets (LIFE) will enable the unprecedented characterisation of the atmospheres of nearby rocky exoplanets, probing mid-infrared signatures of key molecules (e.g. CO2, H2O, O3, and CH4).
Braam M., Angerhausen D.
doaj   +1 more source