Results 81 to 90 of about 411,596 (264)

Gas Absorption Detected from the Edge-on Debris Disk Surrounding HD32297

, 2007
Near-infrared and optical imaging of HD32297 indicate that it has an edge-on debris disk, similar to beta Pic. I present high resolution optical spectra of the NaI doublet toward HD32297 and stars in close angular proximity.
Crawford I. A., Ferlet R., Ferlet R., Freudling W., Lagrange-Henri A. M., Lagrange-Henri A. M., Lallement R., Seth Redfield, Vidal-Madjar A., Welsh B. Y., Welsh B. Y.   +10 more
core   +2 more sources

A HOT MOLECULAR CIRCUMSTELLAR DISK AROUND THE MASSIVE PROTOSTAR ORION SOURCE I [PDF]

, 2013
We report new Atacama Large Millimeter/Submillimeter Array (ALMA) observations of a circumstellar disk around Source I in Orion KL, an archetype of massive protostar candidates.
T. Hirota, Mi Kyoung Kim, Y. Kurono, M. Honma   +3 more
semanticscholar   +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

Debris Disks Can Contaminate Mid-infrared Exoplanet Spectra: Evidence for a Circumstellar Debris Disk around Exoplanet Host WASP-39

The Astrophysical Journal Letters
The signal from a transiting planet can be diluted by astrophysical contamination. In the case of circumstellar debris disks, this contamination could start in the mid-infrared and vary as a function of wavelength, which would then change the observed ...
Laura Flagg, Alycia J. Weinberger, Taylor J. Bell, Luis Welbanks, Giuseppe Morello, Diana Powell, Jacob L. Bean, Jasmina Blecic, Nicolas Crouzet, Peter Gao, Julie Inglis, James Kirk, Mercedes López-Morales, Karan Molaverdikhani, Nikolay Nikolov, Apurva V. Oza, Benjamin V. Rackham, Seth Redfield, Shang-Min Tsai, Ray Jayawardhana, Laura Kreidberg, Matthew C. Nixon, Kevin B. Stevenson, Jake D. Turner   +23 more
doaj   +1 more source

Extremely large and hot multilayer Keplerian disk around the O-type protostar W51N: The precursors of the HCHII regions?

, 2010
We present sensitive high angular resolution (0.57$''$-0.78$''$) SO, SO$_2$, CO, C$_2$H$_5$OH, HC$_3$N, and HCOCH$_2$OH line observations at millimeter and submillimeter wavelengths of the young O-type protostar W51 North made with the Submillimeter ...
Barbosa, Cesaroni, Comito, Eisner, Franco, Franco-Hernández, Galván-Madrid, García-Segura, Guilloteau, Ho, Imai, Keto, Klaassen, Kurtz, Kurtz, Lizano, Luis A. Zapata, Osorio, Rolffs, Sandell, Sandell, Sewilo, Silvia Leurini, Su, Tafoya, van der Tak, Walmsley, Xu, Ya-Wen Tang, Zapata, Zhang   +30 more
core   +1 more source

Vertical settling and radial segregation of large dust grains in the circumstellar disk of the Butterfly Star [PDF]

, 2013
Context. Circumstellar disks are considered to be the environment for the formation of planets. The growth of dust grains in these disks is the first step in the core accretion-gas capture planet formation scenario.
C. Grafe, S. Wolf, S. Guilloteau, A. Dutrey, K. Stapelfeldt, K. Pontoppidan, Jurgen Sauter   +6 more
semanticscholar   +1 more source

Accretion Outbursts in Circumplanetary Disks

, 2012
We describe a model for the long term evolution of a circumplanetary disk that is fed mass from a circumstellar disk and contains regions of low turbulence (dead zones).
Lubow, S. H., Martin, R. G.
core   +1 more source

Dust-to-gas ratio resurgence in circumstellar disks due to the formation of giant planets: the case of HD 163296 [PDF]

, 2019
The amount of dust present in circumstellar disks is expected to steadily decrease with age due to the growth from micron-sized particles to planetesimals and planets. Mature circumstellar disks, however, can be observed to contain significant amounts of
Marzari, F., Polychroni, D., Testi, L., Turrini, D.   +3 more
core   +2 more sources

Doppler tomography of the circumstellar disk of π Aquarii [PDF]

, 2013
Aims. The work is aimed at studying the circumstellar disk of the bright classical binary Be star p Aqr. Methods. We analysed variations of a double-peaked profile of the Ha emission line in the spectrum of p Aqr that was observed in many phases during ~
S. Zharikov, A. Miroshnichenko, E. Pollmann, S. Danford, K. Bjorkman, Nancy D. Morrison, A. Favaro, J. .. Flo, J. Terry, V. Desnoux, T. Garrel, G. Martineau, Y. Buchet, S. Ubaud, B. Mauclaire, H. Kalbermatten, C. Buil, C. J. Sawicki, T. Blank, O. Garde   +19 more
semanticscholar   +1 more source

JWST imaging of the closest globular clusters—I. Possible infrared excess among white dwarfs in NGC 6397

Astronomische Nachrichten, Volume 345, Issue 6-7, July-August 2024.
Abstract We present James Webb Space Telescope observations of the globular cluster NGC 6397 and use them to extend to infrared wavelengths the characterization of the cluster's entire white dwarf (WD) cooling sequence (CS). The data allows us to probe fundamental astrophysical WD properties and to search for evidence in their colors for (or against ...
L. R. Bedin, D. Nardiello, M. Salaris, M. Libralato, P. Bergeron, A. J. Burgasser, D. Apai, M. Griggio, M. Scalco, J. Anderson, R. Gerasimov, A. Bellini   +11 more
wiley   +1 more source