Results 31 to 40 of about 3,893,324 (356)

Isotopic evolution of planetary crusts by hypervelocity impacts evidenced by Fe in microtektites

Nature Communications, 2021
Fe isotopic composition of the distal ejecta of a terrestrial impact crater records both evaporation and condensation, refining the nature of the isotopic fractionation taking place during hypervelocity impacts in the Solar System.
S. M. Chernonozhkin, C. González de Vega, N. Artemieva, B. Soens, J. Belza, E. Bolea-Fernandez, M. Van Ginneken, B. P. Glass, L. Folco, M. J. Genge, Ph. Claeys, F. Vanhaecke, S. Goderis   +12 more
doaj   +1 more source

Natural Products Containing ‘Rare’ Organophosphorus Functional Groups

Molecules, 2019
Phosphorous-containing molecules are essential constituents of all living cells. While the phosphate functional group is very common in small molecule natural products, nucleic acids, and as chemical modification in protein and peptides, phosphorous can ...
Janusz J. Petkowski, William Bains, Sara Seager   +2 more
doaj   +1 more source

Secondary organic aerosols produced from photochemical oxidation of secondarily evaporated biomass burning organic gases: Chemical composition, toxicity, optical properties, and climate effect

Environment International, 2021
Biomass burning (BB) is an important source of primary organic aerosols (POA). These POA contain a significant fraction of semivolatile organic compounds, and can release them into the gas phase during the dilution process in transport.
Zheng Fang, Chunlin Li, Quanfu He, Hendryk Czech, Thomas Gröger, Jianqiang Zeng, Hua Fang, Shaoxuan Xiao, Michal Pardo, Elena Hartner, Daphne Meidan, Xinming Wang, Ralf Zimmermann, Alexander Laskin, Yinon Rudich   +14 more
doaj   +1 more source

Limits on Planetary-mass Primordial Black Holes from the OGLE High-cadence Survey of the Magellanic Clouds [PDF]

Astrophysical Journal Letters
Observations of the Galactic bulge revealed an excess of short-timescale gravitational microlensing events that are generally attributed to a large population of free-floating or wide-orbit exoplanets.
P. Mróz, A. Udalski, M. K. Szymański, I. Soszyński, P. Pietrukowicz, S. Kozłowski, R. Poleski, J. Skowron, K. Ulaczyk, M. Gromadzki, K. Rybicki, P. Iwanek, M. Wrona, Mateusz J. Mróz   +13 more
semanticscholar   +1 more source

Multiple Patchy Cloud Layers in the Planetary-mass Object SIMP 0136+0933 [PDF]

Astrophysical Journal
Multiwavelength photometry of brown dwarfs and planetary-mass objects provides insight into their atmospheres and cloud layers. We present near-simultaneous J- and K s -band multiwavelength observations of the highly variable T2.5 planetary-mass object ...
Allison M. McCarthy, P. Muirhead, P. Tamburo, J. Vos, Caroline V. Morley, J. Faherty, Daniella C. Bardalez Gagliuffi, E. Agol, C. Theissen   +8 more
semanticscholar   +1 more source

Discovery of a planetary-mass companion within the gap of the transition disk around PDS 70 [PDF]

Astronomy & Astrophysics, 2018
Context. Young circumstellar disks are the birthplaces of planets. Their study is of prime interest to understand the physical and chemical conditions under which planet formation takes place.
M. Keppler, M. Benisty, A. Müller, T. Henning, R. Boekel, F. Cantalloube, F. Cantalloube, C. Ginski, R. V. Holstein, A. Maire, A. Pohl, M. Samland, H. Avenhaus, J. Baudino, A. Boccaletti, J. D. Boer, M. Bonnefoy, G. Chauvin, S. Desidera, M. Langlois, C. Lazzoni, G. Marleau, G. Marleau, C. Mordasini, N. Pawellek, N. Pawellek, T. Stolker, A. Vigan, A. Zurlo, A. Zurlo, T. Birnstiel, W. Brandner, M. Feldt, M. Flock, M. Flock, M. Flock, Julien H. Girard, Julien H. Girard, R. Gratton, J. Hagelberg, A. Isella, M. Janson, M. Janson, A. Juhász, J. Kemmer, Q. Kral, Q. Kral, A. Lagrange, R. Launhardt, A. Matter, F. Ménard, J. Milli, P. Mollière, J. Olofsson, J. Olofsson, L. M. Pérez, P. Pinilla, C. Pinte, S. Quanz, T. Schmidt, S. Udry, Z. Wahhaj, J. Williams, E. Buenzli, M. Cudel, C. Dominik, R. Galicher, M. Kasper, J. Lannier, D. Mesa, D. Mouillet, S. Peretti, C. Perrot, G. Salter, E. Sissa, F. Wildi, L. Abe, J. Antichi, J. Augereau, A. Baruffolo, P. Baudoz, A. Bazzon, J. Beuzit, P. Blanchard, S. Brems, T. Buey, V. D. Caprio, M. Carbillet, M. Carle, E. Cascone, A. Cheetham, R. Claudi, A. Costille, A. Delboulb'e, K. Dohlen, D. Fantinel, P. Feautrier, T. Fusco, E. Giro, L. Gluck, C. Gry, N. Hubin, E. Hugot, M. Jaquet, D. L. Mignant, M. Llored, F. Madec, Y. Magnard, P. Martinez, D. Maurel, M. Meyer, M. Meyer, O. Moeller-Nilsson, T. Moulin, L. Mugnier, A. Origné, A. Pavlov, D. Perret, C. Petit, J. Pragt, P. Puget, P. Rabou, J. Ramos, F. Rigal, S. Rochat, R. Roelfsema, G. Rousset, A. Roux, B. Salasnich, J. Sauvage, A. Sevin, C. Soenke, E. Stadler, M. Suarez, M. Turatto, L. Weber   +135 more
semanticscholar   +1 more source

The New Generation Planetary Population Synthesis (NGPPS). IV. Planetary systems around low-mass stars [PDF]

Astronomy & Astrophysics, 2021
Previous work concerning planet formation around low-mass stars has often been limited to large planets and individual systems. As current surveys routinely detect planets down to terrestrial size in these systems, a more holistic approach that reflects ...
R. Burn, M. Schlecker, C. Mordasini, A. Emsenhuber, Y. Alibert, T. Henning, H. Klahr, W. Benz   +7 more
semanticscholar   +1 more source

ACCRETION ONTO PLANETARY MASS COMPANIONS OF LOW-MASS YOUNG STARS [PDF]

The Astrophysical Journal, 2014
Measurements of accretion rates onto planetary mass objects may distinguish between different planet formation mechanisms, which predict different accretion histories. In this Letter, we use \HST/WFC3 UVIS optical photometry to measure accretion rates onto three accreting objects, GSC06214-00210 b, GQ Lup b, and DH Tau b, that are at the planet/brown ...
Zhou, Yifan, Herczeg, Gregory J., Kraus, Adam L., Metchev, Stanimir, Cruz, Kelle L.   +4 more
openaire   +3 more sources

Cloud Atlas: High-contrast Time-resolved Observations of Planetary-mass Companions [PDF]

Astronomical Journal, 2019
Directly imaged planetary-mass companions offer unique opportunities in atmospheric studies of exoplanets. They share characteristics of both brown dwarfs and transiting exoplanets, and therefore are critical for connecting atmospheric characterizations ...
Yifan Zhou, D. Apai, Ben W. P. Lew, G. Schneider, E. Manjavacas, L. Bedin, N. Cowan, M. Marley, Jacqueline Radigan, T. Karalidi, P. Lowrance, P. Miles-Páez, S. Metchev, A. Burgasser   +13 more
semanticscholar   +1 more source

Giant impact, planetary merger, and diversity of planetary-core mass [PDF]

Proceedings of the International Astronomical Union, 2007
AbstractTransit observations indicate a large dispersion in the internal structure among the known gas giants. This is a big challenge to the conventional sequential planetary formation scenario because the diversity is inconsistent with the expectation of some well defined critical condition for the onset of gas accretion in this scenario.
S.-L. Li, C. Agnor, D. N. C. Lin
openaire   +1 more source