Results 71 to 80 of about 25,802 (223)

Are Giant Planets Forming Around HR 4796A? [PDF]

, 2003
We have obtained FUSE and HST STIS spectra of HR 4796A, a nearby 8 Myr old main sequence star that possesses a dusty circumstellar disk whose inclination has been constrained from high resolution near-infrared observations to be ~17 deg from edge-on.
Abgrall H., Augereau J. C., C. H. Chen, Holweger H., I. Kamp, Liseau R., Liseau R.   +6 more
core   +1 more source

Synthetic Modeling of Polarized Dust Emission in Intermediate-mass Young Stellar Objects. II. Effects of Radiative Torque Disruption on Dust Grains in Protostellar Jets/Outflows

The Astrophysical Journal
One possible explanation for the presence of very large grains (VLGs) larger than 10 μ m in the inner envelope of intermediate-mass Class 0/I young stellar objects is their migration from the protostellar disk via outflows. To assess whether RATD hinders
Nguyen Chau Giang, V. J. M. Le Gouellec, Thiem Hoang, A. J. Maury, P. Hennebelle   +4 more
doaj   +1 more source

Circumstellar Disks at White Dwarfs: Observations

, 2011
The current picture painted by the observations of circumstellar dust at white dwarfs, and the consequent atmospheric pollution, is of a surviving planetary system. This chapter recounts in detail both the discovery and empirical characterization of dust
Aannestad, Alcock, Alcock, Allamandola, Allègre, Bannister, Baraffe, Barnbaum, Barstow, Becklin, Beichman, Beichman, Bilikova, Bockelée-Morvan, Brinkworth, Burrows, Canup, Chary, Chayer, Clayton, Davidsson, Debes, Debes, Debes, Debes, Desharnais, Dobbie, Dobbie, Draine, Dufour, Dupuis, Dupuis, Dupuis, Däppen, Eisenstein, Farihi, Farihi, Farihi, Farihi, Farihi, Farihi, Farihi, Farihi, Farihi, Fazio, Ferrario, Fontaine, Friedrich, Friedrich, Gianninas, Graham, Green, Green, Gänsicke, Gänsicke, Gänsicke, Gänsicke, Hansen, Hoard, Holberg, Horne, Houck, Jura, Jura, Jura, Jura, Jura, Jura, Jura, Jura, Jura, Kawka, Kilic, Kilic, Kilic, Kilic, Klein, Kleinman, Koester, Koester, Koester, Koester, Koester, Koester, Lacombe, Lambert, Liebert, Lisse, Lisse, Lisse, Lodders, Malfait, Maxted, McCook, McCord, McLean, Melis, Morbidelli, Mullally, Napiwotzki, Napiwotzki, Paquette, Patterson, Probst, Probst, Rayner, Reach, Reach, Rieke, Schultz, Shipman, Sion, Sion, Skrutskie, Song, Su, Telesco, Thomas, Tokunaga, Tokunaga, Tremblay, van Maanen, van Maanen, Vauclair, von Hippel, Voss, Wachter, Wegner, Wehrse, Weidemann, Werner, Wesemael, Wesemael, Wolff, York, Zuckerman, Zuckerman, Zuckerman, Zuckerman, Zuckerman, Zuckerman, Zuckerman   +141 more
core   +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

The circumstellar envelope of AFGL 4106 [PDF]

, 1999
We present new imaging and spectroscopy of the post-red supergiant binary AFGL 4106. Coronographic imaging in H-alpha reveals the shape and extent of the ionized region in the circumstellar envelope (CSE).
Molster, F. J., van Loon, Jacco Th., van Winckel, Hans, Waters, L. B. F. M.   +3 more
core   +1 more source

The Morphology of the Asteroidal Dust around White Dwarf Stars: Optical and Near-infrared Pulsations in G29-38

The Astrophysical Journal
More than 36 yr have passed since the discovery of the infrared excess from circumstellar dust orbiting the white dwarf G29-38, which at 17.5 pc it is the nearest and brightest of its class.
Ted von Hippel, J. Farihi, J. L. Provencal, S. J. Kleinman, J. E. Pringle, A. Swan, G. Fontaine, J. J. Hermes, J. Sargent, Z. Savery, W. Cooper, V. Kim, V. Kozyreva, M. Krugov, A. Kusakin, A. Moss, W. Ogloza, Erika Pakštienė, A. Serebryanskiy, Eda Sonbas, B. Walter, M. Zejmo, S. Zola   +22 more
doaj   +1 more source

A GLIMPSE into the Nature of Galactic Mid-IR Excesses

, 2008
We investigate the nature of the mid-IR excess for 31 intermediate-mass stars that exhibit an 8 micron excess in either the Galactic Legacy Infrared Mid-Plane Survey Extraordinaire or the Mid-Course Space Experiment using high resolution optical spectra ...
Andrillat A., Ashok N. M., B. Uzpen, Boehm T., Brocklehurst M., Brosche P., C. Thom, Carroll J. A., Catala C., Catala C., D. R. Semler, Dachs J., Finkenzeller U., Finkenzeller U., H. A. Kobulnicky, Israel F. P., Jaschek C., Jaschek C., Jaschek M., Jaschek M., Jenniskens P., Kozok J. R., Monet D. G., Pogodin M. A., Royer F., Seidensticker K. J., Siess L., T. Bensby, The P. S., Viallefond F., Viallefond F., Viallefond F., Westin T. N. G., Wright A. E.   +33 more
core   +1 more source

Detection of CO and Dust Emission in Near-Infrared Spectra of SN 1998S [PDF]

, 1999
Near-infrared spectra (0.95 -- 2.4 micron) of the peculiar Type IIn supernova 1998S in NGC 3877 from 95 to 355 days after maximum light are presented. K-band data taken at days 95 and 225 show the presence of the first overtone of CO emission near 2.3 ...
Bode M. F., Chandrasekhar S., Christopher L. Gerardy, Chugai N. N., Elias J. H., Evans A., Fabian A. C., Gail H. P., Gerardy C. L., Graham J. R., Hagen H.-J., Hoflich P., J. Craig Wheeler, Lewis J. R., Liu W., Meikle W. P. S., Persson S. E., Peter Höflich, Robert A. Fesen, Schlegel E. M., Spyromilio J., Turatto M.   +21 more
core   +3 more sources

Very Late-time JWST and Keck Spectra of the Oxygen-rich Supernova 1995N

The Astrophysical Journal
We present new JWST/MIRI Medium Resolution Spectroscopy and Keck spectra of SN 1995N obtained in 2022–2023, more than 10,000 days after the supernova (SN) explosion. These spectra are among the latest direct detections of a core-collapse SN, both through
Geoffrey C. Clayton, R. Wesson, Ori D. Fox, Melissa Shahbandeh, Alexei V. Filippenko, Bryony Nickson, Michael Engesser, Schuyler D. Van Dyk, WeiKang Zheng, Thomas G. Brink, Yi Yang, Tea Temim, Nathan Smith, Jennifer Andrews, Chris Ashall, Ilse De Looze, James M. Derkacy, Luc Dessart, Michael Dulude, Eli Dwek, Ryan J. Foley, Suvi Gezari, Sebastian Gomez, Shireen Gonzaga, Siva Indukuri, Jacob Jencson, Joel Johansson, Mansi Kasliwal, Zachary G. Lane, Ryan Lau, David Law, Anthony Marston, Dan Milisavljevic, Richard O’Steen, Justin Pierel, Armin Rest, Arkaprabha Sarangi, Matthew Siebert, Michael Skrutskie, Lou Strolger, Tamás Szalai, Samaporn Tinyanont, Qinan Wang, Brian Williams, Lin Xiao, Szanna Zsíros   +45 more
doaj   +1 more source

SPECTROSCOPIC MONITORING OF THE B[E] OBJECTS FSCMA AND MOCAM

Odessa Astronomical Publications, 2019
Objects with the B[e] phenomenon exhibit permitted and forbidden emission lines due to the presence of circumstellar ionized gas and large infrared excesses due to processing of the stellar radiation by circumstellar dust.
A. K. Kuratova, A. S. Miroshnichenko, S. V. Zharikov, N. Manset, S. A. Khokhlov, A. Raj, A. V. Kusakin, I. V. Reva, R. I. Kokumbaeva, I. A. Usenko, A. Y. Knyazev   +10 more
doaj   +1 more source