Results 111 to 120 of about 13,144 (210)

Submillimeter-wavelength Polarimetry of IRC+10216

The Astrophysical Journal
We present SCUBA-2/POL-2 850 μ m polarimetric observations of the circumstellar envelope (CSE) of the carbon-rich asymptotic giant branch (AGB) star IRC+10216.
B-G. Andersson, Janik Karoly, Pierre Bastien, Archana Soam, Simon Coudé, Mehrnoosh Tahani, Michael S. Gordon, Sydney Fox-Middleton   +7 more
doaj   +1 more source

Photoionization modelling of circumstellar nebulae using irregular grains

Monthly Notices of the Royal Astronomical Society
ABSTRACT We study the effects of using the optical properties of irregular hexahedral grains in photoionization models of circumstellar nebulae around evolved stars. Dust opacities for the irregular grains were obtained from the scattering properties available in the TAMUdust2020 data base and these were implemented in the spectral ...
P Jiménez-Hernández, S J Arthur, Daniel Guirado, Olga Muñoz, Julia Martikainen, L Sabin, William J Henney   +6 more
openaire   +2 more sources

Refractory grain processing in circumstellar shells Diagnostic infrared signatures

The Astrophysical Journal, 1986
Recent advances in infrared speckle interferometry reported by Ridgway, et al. (1986) have made possible the determination of the temperatures at the inner radius of certain dusty outflows. When combined with recent data on the thermal annealing and hydrous alteration rates of amorphous magnesium silicate grains, this information allows one to predict ...
Joseph A., III Nuth, Bertram Donn, Robert Nelson   +2 more
openaire   +1 more source

High-contrast imaging constraints on gas giant planet formation - The Herbig Ae/Be star opportunity

, 2015
Planet formation studies are often focused on solar-type stars, implicitly considering our Sun as reference point. This approach overlooks, however, that Herbig Ae/Be stars are in some sense much better targets to study planet formation processes ...
A. Boccaletti, A. Garufi, A. Garufi, A. Vigan, A.-M. Lagrange, A.-M. Lagrange, A.J. Skemer, A.L. Kraus, A.P. Verhoeff, A.S. Hales, A.W. Howard, B. Acke, B. Biller, B. Macintosh, B.A. Biller, B.P. Bowler, B.R. Oppenheimer, C. Marois, C. Marois, C. Marois, C. Pinte, C. Walsh, C.A. Grady, C.A. Grady, C.A. Grady, D.R. Ardila, D.S. Spiegel, E. Pantin, E.L. Nielsen, F. Fressin, F. Joos, F. Pepe, G. Chauvin, G. Witzel, G.D. Mulders, G.M. Kennedy, H. Avenhaus, H. Avenhaus, H. Canovas, H.M. Schmid, H.M. Schmid, I. Baraffe, J. Bouwman, J. Carson, J. Hashimoto, J. Rameau, J. Rameau, J. Rameau, J. Rameau, J. Tinbergen, J.-L. Beuzit, J.-L. Beuzit, J.A. Johnson, J.A. Johnson, J.A. Johnson, J.A. Johnson, J.C. Augereau, J.E. Pineda, J.M. Brown, J.R. Crepp, J.R. Kuhn, K.B. Follette, K.B. Follette, K.I. Öberg, K.M. Kratter, L.M. Close, L.M. Pérez, M. Fukagawa, M. Janson, M. Juan Ovelar de, M. Lambrechts, M. Min, M. Momose, M. Osorio, M. Reggiani, M.D. Perrin, M.S. Marley, N. Kusakabe, P. Pinilla, P. Pinilla, Q.M. Konopacky, R. Dong, S. Casassus, S. Hinkley, S. Ida, S. Reffert, S.D. Brittain, S.D. Brittain, S.M. Andrews, S.P. Quanz, S.P. Quanz, S.P. Quanz, S.P. Quanz, Sascha P. Quanz, T. Currie, T. Muto, T.J. Rodigas, W.J. Borucki, Z. Zhu, Z. Zhu   +99 more
core   +1 more source

The Disks In Scorpius–Centaurus Survey (DISCS). I. Four Newly Resolved Debris Disks in Polarized Intensity Light

The Astronomical Journal
The presence of infrared excesses around stars directly correlates with spatially resolved imaging detections of circumstellar disks at both millimeter and optical/near-infrared wavelengths.
Justin Hom, Thomas M. Esposito, Katie A. Crotts, Gaspard Duchêne, Jennifer Patience, Johan Mazoyer, Robert J. De Rosa, Christine H. Chen, Paul Kalas, Bruce Macintosh, Brenda C. Matthews   +10 more
doaj   +1 more source

Polycyclic aromatic hydrocarbon spectral diversity in NGC 7027 and the evolution of aromatic carriers

Astronomy & Astrophysics
Context. Polycyclic aromatic hydrocarbons (PAHs) constitute a significant fraction of the Universe’s carbon budget, playing a key role in the cosmic carbon cycle and dominating the mid-infrared spectra of astrophysical environments in which they reside ...
Smith-Perez Charlotte, Hembruff Aidan, Peeters Els, Tielens Alexander G. G. M., Ricca Alessandra   +4 more
doaj   +1 more source

Silicon carbide absorption features: dust formation in the outflows of extreme carbon stars

, 2008
Infrared carbon stars without visible counterparts are generally known as extreme carbon stars. We have selected a subset of these stars with absorption features in the 10-13 $\mu$m range, which has been tentatively attributed to silicon carbide (SiC ...
Adrian B. Corman, Angela K. Speck, Bagnulo, Baron, Bernatowicz ., Caleb H. Wheeler, Chan, Chigai, Clément, Clément, de Graauw, DePew, Dijkstra, Dijkstra, Dominik, Fong, Friedman, Gilra, Grant Thompson, Griffin, Groenewegen, Groenewegen, Groenewegen, Hackwell, Hanner, Ivezic, Jennings, Jura, Jørgensen, Kessler, Kristina Wakeman, Lagadec, Leech, Leisenring, Lodders, Lodders, Loup, Meixner, Meixner, Meixner ., Nenkova, Omont ., Pégourié, Renzini, Roawn-Robinson, Saada, Sahai, Skinner, Skrutskie, Sloan, Sloan, Soker, Speck, Speck, Speck, Speck, Szczerba, Thompson, van der Veen, Villaver, Villaver, Volk, Waelkens   +62 more
core   +1 more source

Detailed Radial Scale Height Profile of Dust Grains as Probed by Dust Self-scattering in HL Tau

The Astrophysical Journal Letters
The vertical settling of dust grains in a circumstellar disk, characterized by their scale height, is a pivotal process in the formation of planets. This study offers in-depth analysis and modeling of the radial scale height profile of dust grains in the
Haifeng Yang, Ian W. Stephens, Zhe-Yu Daniel Lin, Manuel Fernández-López, Zhi-Yun Li, Leslie W. Looney, Rachel Harrison   +6 more
doaj   +1 more source

86th Annual Meeting of the Meteoritical Society (2024)

Meteoritics &Planetary Science, Volume 59, Issue S1, Page A1-A468, August 2024.
wiley   +1 more source

Simulations of Multiple Dust Ring Formation in a Subsolar-metallicity Protoplanetary Disk

The Astrophysical Journal
Super-Earths exist around subsolar-metallicity host stars with a frequency comparable to that around solar-metallicity stars, suggesting efficient assembly of dust grains even in metal-deficient environments.
Ryoki Matsukoba, Eduard I. Vorobyov, Takashi Hosokawa   +2 more
doaj   +1 more source