Results 101 to 110 of about 58,337 (174)

X-Ray and UV Observations of the Young Sun HIP 67522: Evidence of Lyα Absorption within the Planetary System

Astronomical Journal
We present ultraviolet (UV) spectroscopy of the 17 Myr, G0V star HIP 67522. The UV spectrum is characterized by strong chromospheric and transition region emission lines.
Cynthia S. Froning, Allison Youngblood, David J. Wilson, G. Duvvuri, K. France, P. C. Schneider, J. S. Pineda, Alexander Brown, A. Sandoval, Tom Ayres   +9 more
semanticscholar   +1 more source

Atmospheric Waves Driving Variability and Cloud Modulation on a Planetary-mass Object

The Astrophysical Journal
Planetary-mass objects and brown dwarfs at the transition ( T _eff ∼ 1300 K) from relatively red L dwarfs to bluer mid-T dwarfs show enhanced spectrophotometric variability.
Michael K. Plummer, Ji Wang, Étienne Artigau, René Doyon, Genaro Suárez   +4 more
doaj   +1 more source

The Polar Vortex Hypothesis: Evolving, Spectrally Distinct Polar Regions Explain Short- and Long-term Light-curve Evolution and Color–Inclination Trends in Brown Dwarfs and Giant Exoplanets

The Astrophysical Journal Letters
Recent studies revealed viewing-angle-dependent color and spectral trends in brown dwarfs, as well as long-term photometric variability (∼100 hr). The origins of these trends are yet unexplained.
Nguyen Fuda, Dániel Apai
doaj   +1 more source

Fully fluorinated non-carbon compounds NF₃ and SF₆ as ideal technosignature gases. [PDF]

Sci Rep, 2023
Seager S, Petkowski JJ, Huang J, Zhan Z, Ravela S, Bains W.   +5 more
europepmc   +1 more source

Analogous response of temperate terrestrial exoplanets and Earth's climate dynamics to greenhouse gas supplement. [PDF]

Sci Rep, 2023
Hochman A, Komacek TD, De Luca P.
europepmc   +1 more source

Pursuing Truth: Improving Retrievals on Mid-infrared Exo-Earth Spectra with Physically Motivated Water Abundance Profiles and Cloud Models

The Astrophysical Journal
Atmospheric retrievals are widely used to constrain exoplanet properties from observed spectra. We investigate how the common nonphysical retrieval assumptions of vertically constant molecule abundances and cloud-free atmospheres affect our ...
Björn S. Konrad, Sascha P. Quanz, Eleonora Alei, Robin Wordsworth   +3 more
doaj   +1 more source

Earth-like Exoplanets in Spin–Orbit Resonances: Climate Dynamics, 3D Atmospheric Chemistry, and Observational Signatures

The Planetary Science Journal
Terrestrial exoplanets around M- and K-type stars are important targets for atmospheric characterization. Such planets are likely tidally locked with the order of spin–orbit resonances (SORs) depending on eccentricity. We explore the impact of SORs on 3D
Marrick Braam, Paul I. Palmer, Leen Decin, Nathan J. Mayne, James Manners, Sarah Rugheimer   +5 more
doaj   +1 more source

Revealing the atmospheres of highly irradiated exoplanets: from ultra-hot Jupiters to rocky worlds. [PDF]

Astrophys Space Sci, 2023
Mansfield M.
europepmc   +1 more source

Photochemically produced SO₂ in the atmosphere of WASP-39b. [PDF]

Nature, 2023
Tsai SM, Lee EKH, Powell D, Gao P, Zhang X, Moses J, Hébrard E, Venot O, Parmentier V, Jordan S, Hu R, Alam MK, Alderson L, Batalha NM, Bean JL, Benneke B, Bierson CJ, Brady RP, Carone L, Carter AL, Chubb KL, Inglis J, Leconte J, Line M, López-Morales M, Miguel Y, Molaverdikhani K, Rustamkulov Z, Sing DK, Stevenson KB, Wakeford HR, Yang J, Aggarwal K, Baeyens R, Barat S, de Val-Borro M, Daylan T, Fortney JJ, France K, Goyal JM, Grant D, Kirk J, Kreidberg L, Louca A, Moran SE, Mukherjee S, Nasedkin E, Ohno K, Rackham BV, Redfield S, Taylor J, Tremblin P, Visscher C, Wallack NL, Welbanks L, Youngblood A, Ahrer EM, Batalha NE, Behr P, Berta-Thompson ZK, Blecic J, Casewell SL, Crossfield IJM, Crouzet N, Cubillos PE, Decin L, Désert JM, Feinstein AD, Gibson NP, Harrington J, Heng K, Henning T, Kempton EM, Krick J, Lagage PO, Lendl M, Lothringer JD, Mansfield M, Mayne NJ, Mikal-Evans T, Palle E, Schlawin E, Shorttle O, Wheatley PJ, Yurchenko SN.   +84 more
europepmc   +1 more source

A young progenitor for the most common planetary systems in the Galaxy. [PDF]

Nature
Livingston JH, Petigura EA, David TJ, Masuda K, Owen J, Nesvorný D, Batygin K, de Leon J, Mori M, Ikuta K, Fukui A, Watanabe N, Orell Miquel J, Murgas F, Parviainen H, Korth J, Libotte F, Abreu García N, Gallardo PPM, Narita N, Pallé E, Tamura M, Yonehara A, Ridden-Harper A, Bieryla A, Trani AA, Mamajek EE, Ciardi DR, Gorjian V, Hillenbrand LA, Rebull LM, Newton ER, Mann AW, Vanderburg A, Stefánsson G, Mahadevan S, Cañas C, Ninan J, Higuera J, Todorov K, Désert JM, Pino L.   +41 more
europepmc   +1 more source