Results 81 to 90 of about 3,278,550 (239)

Photoelectron Spectroscopy of the Phosphorus Monosulfide (PS) and Phosphorus Monoxide (PO) Radicals

Small Structures, Volume 7, Issue 1, January 2026.
Sketch of the experiment to measure the photo electron spectrum of the PS radical produced in situ with a mixture of PH3, H2S and F atoms. PO and PS radicals are the smallest units of phosphorus oxides and phosphorus sulfides, respectively, two rich families of refractory compounds widely employed in industrial and technological applications. These two
Pedro Recio, Jorge Alonso de la Fuente, Myriam Drissi, Niyazi Bulut, Jean Christophe Loison, Gustavo Garcia, Susana Gomez Carrasco, Cristina Sanz Sanz, Luis Bañares, Sonia Marggi Poullain, Alexandre Zanchet   +10 more
wiley   +1 more source

Physical Conditions in Circumstellar Gas Surrounding SN 1987A 12 Years after Outburst [PDF]

, 2000
Two-dimensional spectra of SN 1987A were obtained on 1998 November 14-15 (4282 days after outburst) with the Space Telescope Imaging Spectrograph (STIS) on board the Hubble Space Telescope (HST).
S. Maran, G. Sonneborn, C. Pun, P. Lundqvist, R. Iping, T. Gull   +5 more
semanticscholar   +1 more source

Rapid CO gas dispersal from NO Lup’s class III circumstellar disc

Monthly Notices of the Royal Astronomical Society: Letters, 2020
ABSTRACT We observed the K7 class III star NO Lup in an ALMA survey of the 1–3 Myr Lupus association and detected circumstellar dust and CO gas. Here we show that the J = 3–2 CO emission is both spectrally and spatially resolved, with a broad velocity width ∼19 km s−1 for its resolved size ∼1 arcsec (∼130 au).
J B Lovell, G M Kennedy, S Marino, M C Wyatt, M Ansdell, M Kama, C F Manara, L Matrà, G Rosotti, M Tazzari, L Testi, J P Williams   +11 more
openaire   +7 more sources

Satellites and Small Bodies With ALMA: Insights Into Solar System Formation and Evolution

AGU Advances, Volume 6, Issue 6, December 2025.
Abstract Our understanding of the formation and evolution of planetary systems has made major advances in the past decade. This progress has been driven in large part by the Atacama Large Millimeter/submillimeter Array (ALMA), which has given us an unprecedented view of solar system bodies themselves, and of the structure and chemistry of forming ...
Katherine de Kleer, Michael E. Brown, Martin Cordiner, Richard Teague   +3 more
wiley   +1 more source

Formation Process of the Circumstellar Disk: Long-term Simulations in the Main Accretion Phase of Star Formation

, 2010
The formation and evolution of the circumstellar disk in unmagnetized molecular clouds is investigated using three-dimensional hydrodynamic simulations from the prestellar core until the end of the main accretion phase.
Bate, Bodenheimer, Boley, Calvet, Caselli, Duffin, Durisen, Dutrey, Enoch, Gammie, Goodwin, Hayashi, Inutsuka, Kratter, Larson, Machida, Machida, Machida, Machida, Masahiro N. Machida, Masunaga, Masunaga, Matsumoto, Matzner, Mellon, Mellon, Meyer, Najita, Natta, Saigo, Shu-ichiro Inutsuka, Tomoaki Matsumoto, Truelove, Vorobyov, Watson   +34 more
core   +1 more source

Vertical Structure of Gas and Dust in Four Debris Disks

The Astrophysical Journal
We present high-spectral-resolution M -band spectra from iSHELL on NASA’s Infrared Telescope Facility along the line of sight to the debris disk host star HD 32297. We also present a Gemini Planet Imager H -band polarimetric image of the HD 131488 debris
Kadin Worthen, Christine H. Chen, Sean D. Brittain, Cicero X. Lu, Isabel Rebollido, Aoife Brennan, Luca Matrà, Carl Melis, Timoteo Delgado, Aki Roberge, Johan Mazoyer   +10 more
doaj   +1 more source

JWST Imaging of the Closest Globular Clusters—VI. The Lowest‐Mass Objects in M 4 and the Galactic Bulge

Astronomische Nachrichten, Volume 346, Issue 9, November 2025.
ABSTRACT We present James Webb Space Telescope observations of M 4—the closest globular cluster—that probe the lower Main Sequence down to the hydrogen‐burning limit. The unveiled stellar sequence reaches much fainter luminosities than previously possible, revealing a few extremely red objects that are consistent with brown dwarfs as cool as Teff∼1000K$
L. R. Bedin, R. Gerasimov, A. Calamida, M. Libralato, M. Scalco, D. Nardiello, M. Griggio, D. Apai, J. Anderson, A. Bellini, A. Burgasser   +10 more
wiley   +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

Near-infrared Integral-field Spectroscopy of the Wind Forming Region of CW Leo

The Astronomical Journal
The circumstellar envelope of the carbon star CW Leo exhibited various unexpected changes in recent optical imaging observations. We have performed a follow-up observation using the Near-infrared Integral-Field Spectrograph (NIFS) equipped on the Gemini ...
Hyosun Kim, Youichi Ohyama, Ho-Gyu Lee, Ji Hoon Kim   +3 more
doaj   +1 more source

H2 and CO Emission from Disks around T Tauri and Herbig Ae Pre-Main-Sequence Stars and from Debris Disks around Young Stars: Warm and Cold Circumstellar Gas [PDF]

, 2001
We present ISO Short-Wavelength Spectrometer observations of H2 pure-rotational line emission from the disks around low- and intermediate-mass pre-main-sequence stars as well as from young stars thought to be surrounded by debris disks.
W. Thi, E. V. Dishoeck, G. Blake, G. V. Zadelhoff, J. Horn, E. Becklin, V. Mannings, A. Sargent, M. E. V. D. Ancke, A. Natta, J. K. L. Observatory, The Netherlands., C. I. O. Technology., USA., D. Physics, Astronomy, Ucla, H. C. F. Astrophysics, O. Arcetri, Italy   +19 more
semanticscholar   +1 more source