Výsledky vyhledávání

CN rings in full protoplanetary disks around young stars as probes of disk structure

Autor: Ruud Visser, P. Cazzoletti, Simon Bruderer, E. F. van Dishoeck, Stefano Facchini

Publikováno v: Astronomy and Astrophysics, 609, A93
Astronomy and Astrophysics

Bright ring-like structure emission of the CN molecule has been observed in protoplanetary disks. We investigate whether such structures are due to the morphology of the disk itself or if they are instead an intrinsic feature of CN emission. With the

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::329ecece85542d3b764666db575a8476
https://ui.adsabs.harvard.edu/#abs/2018A&A...609A..93C

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Nitrogen isotope fractionation in protoplanetary disks

Autor: Alan N. Heays, P. Cazzoletti, Ewine F. van Dishoeck, Ruud Visser, Simon Bruderer, Stefano Facchini

Publikováno v: Astronomy and Astrophysics-A&A
Astronomy and Astrophysics-A&A, EDP Sciences, 2018, 615, pp.A75. ⟨10.1051/0004-6361/201731898⟩
Astronomy and Astrophysics, 615, A75

Aims: The two stable isotopes of nitrogen, 14N and 15N, exhibit a range of abundance ratios both inside and outside the solar system. The elemental ratio in the solar neighborhood is 440. Recent ALMA observations showed HCN/HC15N ratios from 83 to 15

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::41212b3f205a2187699db210c7eeb0ae
https://doi.org/10.1051/0004-6361/201731898

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Water delivery from cores to disks: Deuteration as a probe of the prestellar inheritance of H2O

Autor: E. F. van Dishoeck, Daniel Harsono, Ruud Visser, Maria Drozdovskaya, Catherine Walsh, U. Hincelin, Kenji Furuya, Vianney Taquet

Publikováno v: Astronomy & Astrophysics (0004-6361), 599, A40
Astronomy & Astrophysics (0004-6361)

We investigate the delivery of regular and deuterated forms of water from prestellar cores to circumstellar disks. We adopt a semi-analytical axisymmetric two-dimensional collapsing core model with post-processing gas-ice astrochemical simulations, i

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::173d8ed29e7253a4b1723b59e0b908a2
http://hdl.handle.net/1887/59413

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Origin of warm and hot gas emission from low-mass protostars: Herschel-HIFI observations of CO J=16-15. I. Line profiles, physical conditions, and H2O abundance

Publikováno v: NASA Astrophysics Data System
Astronomy and Astrophysics-A&A
Astronomy and Astrophysics-A&A, 2017, 605, pp.A93. ⟨10.1051/0004-6361/201630127⟩
Astronomy & Astrophysics (0004-6361)
Astronomy & Astrophysics (0004-6361), 605, A93

(Abridged) Through spectrally unresolved observations of high-J CO transitions, Herschel-PACS has revealed large reservoirs of warm (300 K) and hot (700 K) molecular gas around low-mass protostars. We aim to shed light on the excitation and origin of

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8a07523cfc3006367023b2db1c20570e

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Methanol along the path from envelope to protoplanetary disc

Autor: Ewine F. van Dishoeck, Ruud Visser, Catherine Walsh, Maria Drozdovskaya, Daniel Harsono

Publikováno v: Monthly Notices of the Royal Astronomical Society. 445:913-929

Interstellar methanol is considered to be a parent species of larger, more complex organic molecules. A physicochemical simulation of infalling parcels of matter is performed for a low-mass star-forming system to trace the chemical evolution from clo

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::551f6d550480bfc1831a643eee16089b
https://doi.org/10.1093/mnras/stu1789

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Water in star-forming regions with Herschel (WISH). VI. Constraints on UV and X-ray irradiation from a survey of hydrides in low- to high-mass young stellar objects

Publikováno v: Chinese Astronomy and Astrophysics
Chinese Astronomy and Astrophysics, Elsevier, 2016, 590, pp.A105. ⟨10.1051/0004-6361/201525835⟩
Astronomy & Astrophysics, 590, A105
Digital.CSIC. Repositorio Institucional del CSIC
instname
Astronomy and astrophysics, 590:A105. EDP Sciences
Chinese Astronomy and Astrophysics, 2016, 590, pp.A105. ⟨10.1051/0004-6361/201525835⟩

[Context] Hydrides are simple compounds containing one or a few hydrogen atoms bonded to a heavier atom. They are fundamental precursor molecules in cosmic chemistry and many hydride ions have become observable in high quality for the first time than

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::bb6872e9fea6369eabcd1f39790b04e0
https://hal.archives-ouvertes.fr/hal-01323874

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Water around IRAS15398-3359 observed with ALMA

Autor: S. K. Jacobsen, Jes K. Jørgensen, Søren Frimann, Ruud Visser, Daniel Harsono, Magnus Persson, Edwin A. Bergin, Nami Sakai, Per Bjerkeli, Satoshi Yamamoto, Johan E. Lindberg, E. F. van Dishoeck

Publikováno v: Astronomy & Astrophysics, 595, A39
NASA Astrophysics Data System
Astronomy & Astrophysics

How protostars accrete mass is one of the fundamental problems of star formation. High column densities and complex kinematical structures make direct observations challenging and they only provide a snapshot. Chemical tracers provide an interesting

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8cb748e1b5f1d1888fa1bbb554152e2e

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Laboratory H2O:CO2ice desorption: entrapment and its parameterization with an extended three-phase model

Autor: Harold Linnartz, Herma M. Cuppen, Ruud Visser, Karin I. Öberg, Edith C. Fayolle

Publikováno v: EAS Publications Series. 58:327-331

Ice desorption affects the evolution of the gas-phase chemistry during the protostellar stage, and also determines the ice composition of comets forming in circumstellar disks. From observations, most volatile species, including CO2 , are found in H2

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::03a4c8cf7e5d9f12aa69767dc321ce9b
https://doi.org/10.1051/eas/1258053

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Chemical History of Molecules in Circumstellar Disks

Autor: Ewine F. van Dishoeck, Ruud Visser, Steven D. Doty

Publikováno v: Proceedings of the International Astronomical Union. 7:138-148

The 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 ch

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::94c920f3f30050a3ac9c90ddad995a90
https://doi.org/10.1017/s1743921311024938

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