Results 41 to 50 of about 3,169 (205)

Confined Chemistry in Space: Zeolite‐Supported Fe13 Nanoclusters Modulate CS Reactivity

Small Structures, Volume 7, Issue 3, March 2026.
The study explores how an Fe13 cluster confined in chabazite reshapes the reaction of CS and H2 under astrochemical conditions. Confinement promotes C–S bond cleavage over hydrogenation, directing chemistry toward CH4 and H2S formation. Additional CS enables CS2 and C2 species. Microkinetic analysis identifies protoplanetary environments where zeolites
Gerard Pareras, Albert Rimola
wiley   +1 more source

Rapid CO gas dispersal from NO Lup’s class III circumstellar disc [PDF]

, 2020
We observed the K7 class III star NO Lup in an ALMA survey of the 1-3 Myr Lupus association and detected circumstellar dust and CO gas. Here we show that the J = 3-2 CO emission is both spectrally and spatially resolved, with a broad velocity width ∼19 ...
Kennedy, GM, Wyatt, M. C., Marino, S., Tazzari, M, Ansdell, M., Testi, L, Tazzari, M., Testi, L., Lovell, J.B., Rosotti, G., Ansdell, M, Lovell, JB, Matra, L, Manara, CF, Manara, C. F., Kennedy, Grant M., Kama, M., Lovell, J. B., Williams, JP, Marino, S, Kama, M, Wyatt, M.C., Kennedy, G.M., Manara, C.F., Rosotti, G, Williams, J. P., Williams, J.P., Matrá, L., Wyatt, MC   +28 more
core   +3 more sources

High-velocity Circumstellar Gas Orbiting a White Dwarf Star

The Astrophysical Journal
Numerous white dwarf stars are known to be orbited by disks of gas and dust. To date, broad, ∼300 km s ^−1 wide, gaseous circumstellar absorption features have only been reported for the already iconic WD 1145+017, where one is witnessing the breakup of ...
B. Zuckerman, Érika Le Bourdais, Beth L. Klein, Patrick Dufour, Carl Melis, Alycia J. Weinberger, Siyi Xu, Antoine Bédard, Detlev Koester   +8 more
doaj   +1 more source

Radio Observations of Six Young Type Ia Supernovae

The Astrophysical Journal, 2023
Type Ia supernovae (SNe Ia) are important cosmological tools, probes of binary star evolution, and contributors to cosmic metal enrichment; yet, a definitive understanding of the binary star systems that produce them remains elusive.
C. E. Harris, Sumit K. Sarbadhicary, L. Chomiuk, Anthony L. Piro, D. J. Sand, S. Valenti   +5 more
doaj   +1 more source

Diurnal Variability Modulates Episodic Convection in Hothouse Climates Over Ocean and Swamp‐Like Surface Conditions

Journal of Advances in Modeling Earth Systems, Volume 18, Issue 2, February 2026.
Abstract Hot and moist “hothouse” climates occurred in Earth's past and are expected in Earth's far future climate, driven by increasing solar luminosity. In hothouse climate regimes, precipitation transitions from a quasi‐steady state, as in present‐day tropical convection, to an “episodic deluge” or relaxation‐oscillator (RO) regime where ...
Namrah Habib, Guy Dagan, Nathan Steiger
wiley   +1 more source

Discovery of Volatile Gas in the Giant Impact Disk Around the 150 Myr Old HD 23514

The Astrophysical Journal Letters
We report the discovery of CO _2 gas emission around HD 23514, an F5V star in the ∼150 Myr old Pleiades cluster, hosting one of the rare giant-impact disks with unique mineralogy dominated by silica dust. We show that the dust feature remains stable over
Kate Y. L. Su, Attila Moór, Chengyan Xie, Ilaria Pascucci, George H. Rieke, Ágnes Kóspál, Mark C. Wyatt, Péter Ábrahám, Luca Matrà, Zoe Roumeliotis, D. J. Wilner   +10 more
doaj   +1 more source

Exploring the Effects of Reduced Gravitational Field Impacts on Convective Heat Transfer: A Comprehensive Review

Heat Transfer, Volume 55, Issue 1, Page 764-774, January 2026.
ABSTRACT This review explores the impact of gravitational instability on convective heat transfer, integrating existing research results and theoretical models. Gravitational instability is vital in promoting or hindering convective actions in different systems, such as atmospheric events, ocean currents, and industrial processes.
Hossam A. Nabwey, Muhammad Ashraf, A. M. Rashad, Ali J. Chamkha   +3 more
wiley   +1 more source

The ALMA Survey of Gas Evolution of PROtoplanetary Disks (AGE-PRO). VIII. The Impact of External Photoevaporation on Disk Masses and Radii in Upper Scorpius

The Astrophysical Journal
Protoplanetary disk evolution can be deeply influenced by the UV radiation emitted by neighboring massive stars (mainly of spectral types O and B). We show that the process of external photoevaporation , which causes an outside-in depletion of disk ...
Rossella Anania, Giovanni P. Rosotti, Matías Gárate, Paola Pinilla, Miguel Vioque, Leon Trapman, John Carpenter, Ke Zhang, Ilaria Pascucci, Lucas A. Cieza, Anibal Sierra, Nicolas T. Kurtovic, James Miley, Laura M. Pérez, Benoît Tabone, Michiel Hogerheijde, Dingshan Deng, Carolina Agurto-Gangas, Dary A. Ruiz-Rodriguez, Camilo González-Ruilova, Estephani E. TorresVillanueva   +20 more
doaj   +1 more source

Photoelectron Spectroscopy of the Phosphorus Monosulfide (PS) and Phosphorus Monoxide (PO) Radicals

Small Structures, Volume 7, Issue 1, January 2026.
Sketch of the experiment to measure the photo electron spectrum of the PS radical produced in situ with a mixture of PH3, H2S and F atoms. PO and PS radicals are the smallest units of phosphorus oxides and phosphorus sulfides, respectively, two rich families of refractory compounds widely employed in industrial and technological applications. These two
Pedro Recio, Jorge Alonso de la Fuente, Myriam Drissi, Niyazi Bulut, Jean Christophe Loison, Gustavo Garcia, Susana Gomez Carrasco, Cristina Sanz Sanz, Luis Bañares, Sonia Marggi Poullain, Alexandre Zanchet   +10 more
wiley   +1 more source

Generation of a circumstellar gas disc by hot Jupiter WASP-12b [PDF]

Monthly Notices of the Royal Astronomical Society, 2018
Observations of transiting extra-solar planets provide rich sources of data for probing the in-system environment. In the WASP-12 system, a broad depression in the usually-bright MgII h&k lines has been observed, in addition to atmospheric escape from the extremely hot Jupiter WASP-12b.
Alex Debrecht, Jonathan Carroll-Nellenback, Adam Frank, Luca Fossati, Eric G Blackman, Ian Dobbs-Dixon   +5 more
openaire   +2 more sources