Results 51 to 60 of about 740 (174)

The Circumstellar Disk HD 169142: Gas, Dust, and Planets Acting in Concert?* [PDF]

The Astrophysical Journal, 2017
Abstract HD 169142 is an excellent target for investigating signs of planet–disk interaction due to previous evidence of gap structures. We perform J-band (∼1.2 μm) polarized intensity imaging of HD 169142 with VLT/SPHERE. We observe polarized scattered light down to 0.″16 (∼19 au) and find an inner gap with a significantly reduced ...
Pohl, A., Benisty, M., Pinilla, P., Ginski, C., Boer, J., Avenhaus, H., Henning, Th., Zurlo, A., Boccaletti, A., Augereau, J.C., Birnstiel, T., Dominik, C., Facchini, S., Fedele, D., Janson, M., Keppler, M., Kral, Q., Langlois, M., Ligi, R., Maire, A.L., Menard, F., Meyer, M., Pinte, C., Quanz, S.P., Sauvage, J.F., Sezestre, E., Stolker, T., Szulagyi, J., Boekel, R., Plas, G., Villenave, M., Baruffolo, A., Baudoz, P., Le Mignant, D., Maurel, D., Ramos, J., Weber, L.   +36 more
openaire   +8 more sources

Insights Into the Gas‐Phase Structure and Internal Dynamics of Diphenylsilane: A Broadband Rotational Spectroscopy Study

ChemPhysChem, Volume 26, Issue 2, January 14, 2025.
The structure of diphenylsilane could be determined from the rotational spectra of all its singly substituted heavy atom isotopologues. A comparison with its oxygen analogue diphenylether revealed some interesting differences in the internal dynamics as well as in the gas‐phase structure.
Gayatri Batra, Melanie Schnell
wiley   +1 more source

Fe I in the β Pictoris circumstellar gas disk [PDF]

Astronomy & Astrophysics, 2017
The young planetary system β Pictoris is surrounded by a circumstellar disk of dust and gas. Because both dust and gas have a lifetime shorter than the system age, they need to be replenished continuously. The gas composition is partly known, but its location and its origin are still a puzzle. The gas source could be the exocomets (or so-called falling
Vidal-Madjar, A., Kiefer, F., Lecavelier Des Etangs, A., Bourrier, V., Ehrenreich, D., Ferlet, R., Hébrard, G., Wilson, P. A.   +7 more
openaire   +3 more sources

Atacama Large Aperture Submillimeter Telescope (AtLAST) science: Our Galaxy

Open Research Europe
As we learn more about the multi-scale interstellar medium (ISM) of our Galaxy, we develop a greater understanding for the complex relationships between the large-scale diffuse gas and dust in Giant Molecular Clouds (GMCs), how it moves,
Pamela Klaassen, Alessio Traficante, Maria Beltrán, Kate Pattle, Mark Booth, Joshua Lovell, Jonathan Marshall, Alvaro Hacar, Brandt Gaches, Caroline Bot, Nicolas Peretto, Thomas Stanke, Doris Arzoumanian, Ana Duarte Cabral, Gaspard Duchêne, David Eden, Antonio Hales, Jens Kauffmann, Patricia Luppe, Sebastian Marino, Elena Redaelli, Andrew Rigby, Álvaro Sánchez-Monge, Eugenio Schisano, Dmitry Semenov, Silvia Spezzano, Mark Thompson, Friedrich Wyrowski, Claudia Cicone, Tony Mroczkowski, Martin Cordiner, Luca Di Mascolo, Doug Johnstone, Eelco van Kampen, Minju Lee, Daizhong Liu, Thomas Maccarone, Amélie Saintonge, Matthew Smith, Alexander Thelen, Sven Wedemeyer   +40 more
doaj   +3 more sources

Toward an efficient second‐order method for computing the surface gravitational potential on spherical‐polar meshes

Astronomische Nachrichten, Volume 345, Issue 8, October 2024.
Abstract Astrophysical accretion discs that carry a significant mass compared with their central object are subject to the effect of self‐gravity. In the context of circumstellar discs, this can, for instance, cause fragmentation of the disc gas, and—under suitable conditions—lead to the direct formation of gas‐giant planets.
Oliver Gressel, Udo Ziegler
wiley   +1 more source

The chemical history of molecules in circumstellar disks [PDF]

Astronomy & Astrophysics, 2011
18 pages, 12 figures, accepted by A& ...
Visser, R., Doty, S., Van Dishoeck, E.
openaire   +3 more sources

A Multiwavelength ALMA View of Gas and Dust in Binary Protoplanetary System AS 205: Evidence of Dust Asymmetric Distribution

The Astrophysical Journal
We present Atacama Large Millimeter/submillimeter Array observations of multiwavelength dust emissions at 3.1 and 1.3 mm, along with molecular line emissions of CO(2–1), CO(3–2), ^13 CO(3–2), and C ^18 O(3–2) at spatial resolutions of 7–45 au toward the ...
Nguyen Thi Phuong, Nguyen Tat Thang
doaj   +1 more source

First direct detection of large polycyclic aromatic hydrocarbons on asteroid (162173) Ryugu samples: An interstellar heritage

Natural Sciences, Volume 4, Issue 4, October 2024.
Large free aromatic species, with up to 61 carbon atoms, were detected in grains of the Ryugu carbonaceous asteroid using ultra‐sensitive two‐step laser mass spectrometry. This discovery confirms the presence of large polycyclic aromatic hydrocarbons in the interstellar medium and provides new information on the formation and evolution of organic ...
Hassan Sabbah, Ghylaine Quitté, Karine Demyk, Christine Joblin   +3 more
wiley   +1 more source

Gas Flows and Mass Accretion Rates in Eight Dippers: HD 142666, HD 143006, HD 145718, V935 Sco, DoAr 25, EPIC 204638512, EPIC 205151387, and EPIC 203850058

The Astronomical Journal
One of the scenarios used to explain the dipper phenomenon in stars is having the innermost disk regions being close to the line of sight to the star—inclined greater than 60°—regardless of the inclination of the outermost disk (“misaligned” or “broken ...
Michael L. Sitko, Ray W. Russell, Korash D. Assani, Lucia Adame, Jesus Hernandez   +4 more
doaj   +1 more source

OH/IR stars in the inner Galactic bulge

Astronomy & Astrophysics
Context. Stars on the asymptotic giant branch (AGB) play important roles in a number of astronomical contexts. To quantify these roles, it is necessary to establish the mass-loss characteristics of stars as they evolve up and beyond the AGB. Aims.
Olofsson H., Khouri T., Muller S., Unnikrishnan R., Groenewegen M. A. T., Blommaert J. A. D. L., De Beck E., Kastner J. H., Maercker M., Patel N., Ryde N., Sargent B. A., Srinivasan S., Vlemmings W. H. T.   +13 more
doaj   +1 more source