Results 71 to 80 of about 13,043 (174)

A close halo of large transparent grains around extreme red giant stars

, 2012
Intermediate-mass stars end their lives by ejecting the bulk of their envelope via a slow dense wind back into the interstellar medium, to form the next generation of stars and planets.
Albert A. Zijlstra, B Gustafsson, Barnaby R. M. Norris, BT Draine, C Jäger, C Loup, E Lagadec, F van Leeuwen, Foteini Lykou, H Olofsson, H-P Gail, HJ Habing, JC Weingartner, LBFM Waters, M Marengo, M Wittkowski, Michael J. Ireland, MJ Ireland, MJ Ireland, MJ Ireland, P Tuthill, P Woitke, Paul Stewart, PC Frisch, Peter G. Tuthill, PG Tuthill, PR Wood, R Lenzen, S Höfner, S Höfner, S Lacour, Sylvestre Lacour, Thomas M. Evans, Timothy R. Bedding   +33 more
core   +3 more sources

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

Circumstellar shells and mass loss rates: Clues to the evolution of S stars

, 1997
It is the purpose of this paper to rediscuss the circumstellar properties of S stars and to put these properties in perspective with our current understanding of the evolutionary status of S stars, in particular the intrinsic/extrinsic dichotomy ...
Jorissen, A., Knapp, G. R.
core   +1 more source

Adaptive Optics Imaging of the AU Microscopii Circumstellar Disk: Evidence for Dynamical Evolution [PDF]

, 2004
We present an H-band image of the light scattered from circumstellar dust around the nearby (10 pc) young M star AU Microscopii (AU Mic, GJ 803, HD 197481), obtained with the Keck adaptive optics system.
Divine N., Joshua A. Eisner, Keenan P. C., Krist J. E., Lecavelier des Etangs A., Leinert C., Lynne A. Hillenbrand, Mouillet D., Pantin E., Pantin E., Perryman M. A. C., Sebastian Wolf, Stanimir A. Metchev, Stern S. A., Torres C. A. O.   +14 more
core   +3 more sources

Exploring wind-driving dust species in cool luminous giants II. Constraints from photometry of M-type AGB stars

, 2013
The heavy mass loss observed in evolved asymptotic giant branch (AGB) stars is usually attributed to a two-stage process: atmospheric levitation by pulsation-induced shock waves, followed by radiative acceleration of newly formed dust grains.
B. Aringer, K. Eriksson, S. Bladh, S. Höfner, W. Nowotny   +4 more
core   +1 more source

HD101584: Circumstellar characteristics and evolutionary status

, 2019
We have performed a study of the characteristics of the circumstellar environment of the binary object HD101584, that provides information on a likely evolutionary scenario.
Bergman, P., Doan, L., Humphreys, E. M. L., Khouri, T., Lindqvist, M., Maercker, M., Nyman, L., Olofsson, H., Ramstedt, S., Tafoya, D., Vlemmings, W. H. T.   +10 more
core   +1 more source

A Tidally-Disrupted Asteroid Around the White Dwarf G29-38 [PDF]

, 2003
The infrared excess around the white dwarf G29-38 can be explained by emission from an opaque flat ring of dust with an inner radius 0.14 of the radius of the Sun and an outer radius approximately equal to the Sun's.
Koester D., M. Jura, Michalak G., Nicholson P., Ossenkopf V., Vauclair G.   +5 more
core   +3 more sources

Strontium-84 Enrichments in Presolar Grains Provide First Evidence of p-process Nucleosynthesis in Core-collapse Supernovae

The Astrophysical Journal Letters
This study reports detection of rare p -process isotopes within presolar grains. Presolar grains are relic dust grains from dying stars. These microscopic dust particles are found in primitive solar system materials.
Ishita Pal, Manavi Jadhav, Danielle Z. Shulaker, Michael R. Savina, Marco Pignatari, Lorenzo Roberti, Heather Bouillion, Maria Lugaro, Christopher J. Dory, Frank Gyngard, Noriko Kita, Sachiko Amari   +11 more
doaj   +1 more source

Protostellar Chimney Flues: Are Jets and Outflows Lifting Submillimeter Dust Grains from Disks into Envelopes?

The Astrophysical Journal
Low dust opacity spectral indices ( β < 1) measured in the inner envelopes of class 0/I young stellar objects (age ∼10 ^4–5 yr) have been interpreted as the presence of (sub-)millimeter dust grains in these environments.
L. Cacciapuoti, L. Testi, L. Podio, C. Codella, A. J. Maury, M. De Simone, P. Hennebelle, U. Lebreuilly, R. S. Klessen, S. Molinari   +9 more
doaj   +1 more source

The Nucleated Atomistic Grain Growth Simulator (NAGGS): application to the size-dependent structural and physical properties of nanosilicate dust

Astronomy & Astrophysics
Context. The essential physics of dust grains are typically rationalised using phenomenological approaches, often assuming highly simplified grain morphologies.
Mariñoso Guiu Joan, Maciá Escatllar Antoni, Bromley Stefan T.   +2 more
doaj   +1 more source