Results 101 to 110 of about 411,596 (264)

Hourglass Magnetic Field of a Protostellar System

Universe
An hourglass-shaped magnetic field pattern arises naturally from the gravitational collapse of a star-forming gas cloud. Most studies have focused on the prestellar collapse phase, when the structure has a smooth and monotonic radial profile.
Shantanu Basu, Xiyuan Li, Gianfranco Bino   +2 more
doaj   +1 more source

Color Gradients Detected in the HD 15115 Circumstellar Disk

, 2008
We report HST/NICMOS coronagraphic images of the HD 15115 circumstellar disk at 1.1\micron. We find a similar morphology to that seen in the visible and at H band--an edge-on disk that is asymmetric in surface brightness.
Alycia J. Weinberger, Ardila, Debes, Decin, Golimowski, Hines, Inseok Song, John H. Debes, Kalas, Moór, Ortega, Schneider, Silverstone, Song, Thompson, Weinberger, Weinberger, Williams, Zuckerman   +18 more
core   +1 more source

First 3-D grid-based gas-dust simulations of circumstellar disks with an embedded planet [PDF]

, 2021
Fabian Binkert, J. Szulágyi, T. Birnstiel   +2 more
openalex   +1 more source

The circumstellar disk of AB Aurigae: evidence for envelope accretion at late stages of star formation? [PDF]

, 2012
Aims. The circumstellar disk of AB Aurigae has garnered strong attention owing to the apparent existence of spirals at a relatively young stage and also the asymmetric disk traced in thermal dust emission.
Ya-wen Tang, S. Guilloteau, V. Piétu, A. Dutrey, N. Ohashi, P. Ho   +5 more
semanticscholar   +1 more source

Characterizing the dynamical magnetosphere of the extremely slowly rotating magnetic O9.7 V star HD 54879 using rotational modulation of the Hα profile

Astronomische Nachrichten, Volume 345, Issue 4, May 2024.
Abstract The magnetic field in the O9.7 V star HD 54879 has been monitored for almost a decade. Spectropolarimetric observations reveal a rather strong mean longitudinal magnetic field that varies with a period of about 7.41 years. Observations in the Hα$$ \alpha $$ line show a variation with the same period, while the Hβ$$ \beta $$ line shows only ...
Manfred Küker, S. P. Järvinen, S. Hubrig, Ilya Ilyin, M. Schöller   +4 more
wiley   +1 more source

Constraints on the Orbit of the Young Substellar Companion GQ Lup B from High-resolution Spectroscopy and VLTI/GRAVITY Astrometry

The Astrophysical Journal
Understanding the orbits of giant planets is critical for testing planet formation models, particularly at wide separations (>10 au) where traditional core accretion becomes inefficient.
Vidya Venkatesan, S. Blunt, J. J. Wang, S. Lacour, G.-D. Marleau, G. A. L. Coleman, L. Guerrero, W. O. Balmer, L. Pueyo, T. Stolker, J. Kammerer, N. Pourré, M. Nowak, E. Rickman, A. Sivaramakrishnan, D. Sing, K. Wagner, A.-M. Lagrange, R. Abuter, A. Amorim, R. Asensio-Torres, J.-P. Berger, H. Beust, A. Boccaletti, M. Bonnefoy, H. Bonnet, M. S. Bordoni, G. Bourdarot, W. Brandner, F. Cantalloube, P. Caselli, B. Charnay, G. Chauvin, A. Chavez, A. Chomez, E. Choquet, V. Christiaens, Y. Clénet, V. Coudé du Foresto, A. Cridland, R. Davies, R. Dembet, J. Dexter, A. Drescher, G. Duvert, A. Eckart, F. Eisenhauer, N. M. Förster Schreiber, P. Garcia, R. Garcia Lopez, E. Gendron, R. Genzel, S. Gillessen, J. H. Girard, S. Grant, X. Haubois, G. Heissel, Th. Henning, S. Hinkley, S. Hippler, M. Houllé, Z. Hubert, L. Jocou, M. Keppler, P. Kervella, L. Kreidberg, N. T. Kurtovic, V. Lapeyrère, J.-B. Le Bouquin, D. Lutz, A.-L. Maire, F. Mang, A. Mérand, C. Mordasini, D. Mouillet, E. Nasedkin, T. Ott, G. P. P. L. Otten, C. Paladini, T. Paumard, K. Perraut, G. Perrin, S. Petrus, O. Pfuhl, D. C. Ribeiro, Z. Rustamkulov, J. Shangguan, T. Shimizu, A. Shields, J. Stadler, O. Straub, C. Straubmeier, E. Sturm, L. J. Tacconi, A. Vigan, F. Vincent, S. D. von Fellenberg, F. Widmann, T. O. Winterhalder, J. Woillez, S. Yazici, the ExoGRAVITY Collaboration   +101 more
doaj   +1 more source

Polarization of Circumstellar Debris Disk Light Echoes

The Astronomical Journal
Light echoes of debris disks around active stars can reveal disk structure and composition even when disks are not spatially resolved. Unfortunately, distinguishing reflected light from quiescent starlight and unexpected post-peak flare structure is ...
Austin J. King, Benjamin C. Bromley, Preston W. Harris, Scott J. Kenyon   +3 more
doaj   +1 more source

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

RESOLVING THE CIRCUMSTELLAR DISK AROUND THE MASSIVE PROTOSTAR DRIVING THE HH 80–81 JET [PDF]

, 2012
We present new high angular resolution observations toward the driving source of the HH 80–81 jet (IRAS 18162–2048). Continuum emission was observed with the Very Large Array at 7 mm and 1.3 cm, and with the Submillimeter Array at 860 μm, with angular ...
C. Carrasco-González, R. Galván-Madrid, G. Anglada, M. Osorio, P. D’Alessio, P. Hofner, Luis F. Rodriguez, H. Linz, E. Araya   +8 more
semanticscholar   +1 more source

The JWST Early Release Science Program for Direct Observations of Exoplanetary Systems. VI. Evidence for Radially Evolving Icy Grains in the HD 141569A Disk via NIRCam Coronagraphic Imaging

The Astrophysical Journal
We present JWST NIRCam coronagraphic observations of the HD 141569A circumstellar disk, obtained as part of the JWST Early Release Science program. The observations recover the multi-ringed structure seen in previous shorter-wavelength observations, but ...
Maxwell A. Millar-Blanchaer, Élodie Choquet, Kellen Lawson, Sebastián Marino, Jens Kammerer, Aarynn L. Carter, Isabel Rebollido, Jarron M. Leisenring, Minjae Kim, Paul Kalas, Karl R Stapelfeldt, Sasha Hinkley, Mark Booth, Carol A. Grady, Elisabeth C. Matthews, Beth A. Biller, Andrew Skemer, Julien H. Girard, Schuyler G. Wolff, Kimberly Ward-Duong, Michael R. Meyer, Anthony Boccaletti, Eric Pantin, Brenda C. Matthews, Stanimir Metchev, Marshall D. Perrin, Christine H. Chen, Katie Crotts, Olivier Absil, William O. Balmer, Per Calissendorff, Gabriele Cugno, Thayne Currie, Camilla Danielski, Kielan K. W. Hoch, Markus Janson, Elena Manjavacas, Pierre-Olivier Lagage, Ben J. Sutlieff, Shrishmoy Ray, Bin B. Ren, Emily Rickman, Genaro Suárez, Christopher A. Theissen, Taichi Uyama, Andreas Quirrenbach, Jason J. Wang, Niall Whiteford, Mark C. Wyatt, Alice Zurlo, (The JWST ERS Collaboration)   +50 more
doaj   +1 more source