Results 31 to 40 of about 17,073 (217)

A Dusty Disk Around WD1150-153: Explaining the Metals in White Dwarfs by Accretion from the Interstellar Medium versus Debris Disks [PDF]

, 2007
We report the discovery of excess K-band radiation from a metal-rich DAV white dwarf star, WD1150-153. Our near infrared spectroscopic observations show that the excess radiation cannot be explained by a (sub)stellar companion, and is likely to be caused
Bradley P. A., Kilkenny D., Mukremin Kilic, Seth Redfield, Weidemann V., Wood B. E.   +5 more
core   +4 more sources

A Keplerian Circumbinary Disk around the Protobinary System L1551 NE [PDF]

, 2012
We present SubMillimeter-Array observations of a Keplerian disk around the Class I protobinary system L1551 NE in 335 GHz continuum emission and submillimeter line emission in 13CO (J=3-2) and C18O (J=3-2) at a resolution of ~120 x 80 AU.
Andrews, Andrews, Bate, Chen, Crutcher, Delfosse, Duquennoy, Enoch, Enoch, Froebrich, Fuller, Guilloteau, Guilloteau, Harvey, Harvey, Hayashi, Ho, Hogerheijde, Jeremy Lim, Kazuya Saigo, Lim, Loinard, Looney, Looney, Machida, Machida, Machida, Masao Saito, Mathieu, Mellon, Mellon, Momose, Moriarty-Schieven, Moriarty-Schieven, Nimesh A. Patel, Ochi, Ohashi, Ossenkopf, Reipurth, Reipurth, Rodríguez, Sault, Schaefer, Shigehisa Takakuwa, T. K. Sridharan, Takakuwa, Takakuwa, Takakuwa, Vorobyov, Yen, Yen, Yokogawa   +51 more
core   +3 more sources

Early Planet Formation in Embedded Disks (eDisk). XIII. Aligned Disks with Nonsettled Dust around the Newly Resolved Class 0 Protobinary R CrA IRAS 32

The Astrophysical Journal
Young protostellar binary systems, with expected ages less than ∼10 ^5 yr, are little modified since birth, providing key clues to binary formation and evolution. We present a first look at the young, Class 0 binary protostellar system R CrA IRAS 32 from
Frankie J. Encalada, Leslie W. Looney, Shigehisa Takakuwa, John J. Tobin, Nagayoshi Ohashi, Jes K. Jørgensen, Zhi-Yun Li, Yuri Aikawa, Yusuke Aso, Patrick M. Koch, Woojin Kwon, Shih-Ping Lai, Chang Won Lee, Zhe-Yu Daniel Lin, Alejandro Santamaría-Miranda, Itziar de Gregorio-Monsalvo, Nguyen Thi Phuong, Adele Plunkett, Jinshi Sai (Insa Choi), Rajeeb Sharma, Hsi-Wei Yen, Ilseung Han   +21 more
doaj   +1 more source

Long-term optical variability of high-mass X-ray binaries

Astronomy & Astrophysics
Context. Systems known as Be/X-ray binaries form the most numerous group of high-mass X-ray binaries. Their long-term optical and infrared variability reflects the evolution of the circumstellar disk around the luminous companion.
Reig P., Blinov D., Tzouvanou A.
doaj   +1 more source

Confined Chemistry in Space: Zeolite‐Supported Fe13 Nanoclusters Modulate CS Reactivity

Small Structures, Volume 7, Issue 3, March 2026.
The study explores how an Fe13 cluster confined in chabazite reshapes the reaction of CS and H2 under astrochemical conditions. Confinement promotes C–S bond cleavage over hydrogenation, directing chemistry toward CH4 and H2S formation. Additional CS enables CS2 and C2 species. Microkinetic analysis identifies protoplanetary environments where zeolites
Gerard Pareras, Albert Rimola
wiley   +1 more source

The ALMA Survey of Gas Evolution of PROtoplanetary Disks (AGE-PRO). VIII. The Impact of External Photoevaporation on Disk Masses and Radii in Upper Scorpius

The Astrophysical Journal
Protoplanetary disk evolution can be deeply influenced by the UV radiation emitted by neighboring massive stars (mainly of spectral types O and B). We show that the process of external photoevaporation , which causes an outside-in depletion of disk ...
Rossella Anania, Giovanni P. Rosotti, Matías Gárate, Paola Pinilla, Miguel Vioque, Leon Trapman, John Carpenter, Ke Zhang, Ilaria Pascucci, Lucas A. Cieza, Anibal Sierra, Nicolas T. Kurtovic, James Miley, Laura M. Pérez, Benoît Tabone, Michiel Hogerheijde, Dingshan Deng, Carolina Agurto-Gangas, Dary A. Ruiz-Rodriguez, Camilo González-Ruilova, Estephani E. TorresVillanueva   +20 more
doaj   +1 more source

Interferometric Upper Limits on Millimeter Polarization of the Disks around DG Tau, GM Aur, and MWC 480

, 2013
Millimeter-wavelength polarization measurements offer a promising method for probing the geometry of magnetic fields in circumstellar disks. Single dish observations and theoretical work have hinted that magnetic field geometries might be predominantly ...
Hughes, A. M., Hull, C. L. H., Plambeck, R. L., Wilner, D. J.   +3 more
core   +1 more source

Circumplanetary disks around young giant planets: a comparison between core-accretion and disk instability [PDF]

, 2016
Circumplanetary disks can be found around forming giant planets, regardless of whether core accretion or gravitational instability built the planet.
Mayer, L., Quinn, T., Szulágyi, J.
core   +1 more source

Observations of circumstellar disks [PDF]

Proceedings of the International Astronomical Union, 2010
AbstractIn this review I will present recent results obtained between 2005, which was the last “Be-stars” meeting in Sapporo, and 2010, on the observations of circumstellar disks around active hot stars.
openaire   +1 more source

Chemical History of Molecules in Circumstellar Disks [PDF]

Proceedings of the International Astronomical Union, 2011
AbstractThe chemical composition of a protoplanetary disk is determined not only by in situ chemical processes during the disk phase, but also by the history of the gas and dust before it accreted from the natal envelope. In order to understand the disk's chemical composition at the time of planet formation, especially in the midplane, one has to go ...
Visser, R., Van Dishoeck, E., Doty, S.
openaire   +3 more sources