Zobrazeno 1 - 10
of 534
pro vyhledávání: '"Thi, W."'
The detection of Keplerian rotation is rare among Class 0 protostellar systems. We have investigated the high-density tracer HCN as a probe of the inner disk in a Class 0 proto-brown dwarf candidate. Our ALMA high angular resolution observations show
Externí odkaz:
http://arxiv.org/abs/2405.11321
We present results from the first molecular line survey to search for the fundamental complex organic molecule, methanol (CH$_{3}$OH), in 14 Class 0/I proto-brown dwarfs (proto-BDs). IRAM 30-m observations over the frequency range of 92-116 GHz and 2
Externí odkaz:
http://arxiv.org/abs/2305.04991
Autor:
Rocha, W. R. M., Woitke, P., Pilling, S., Thi, W. -F., Jørgensen, J. K., Kristensen, L. E., Perotti, G., Kamp, I.
Publikováno v:
A&A 673, A70 (2023)
Methanol is the most complex molecule securely identified in interstellar ices and is a key chemical species for understanding chemical complexity in astrophysical environments. Important aspects of the methanol ice photochemistry are still unclear s
Externí odkaz:
http://arxiv.org/abs/2302.04239
Autor:
Rab, Ch., Weber, M., Grassi, T., Ercolano, B., Picogna, G., Caselli, P., Thi, W. -F., Kamp, I., Woitke, P.
Publikováno v:
A&A 668, A154 (2022)
Winds in protoplanetary disks play an important role in their evolution and dispersal. However, what physical process is driving the winds is still unclear (i.e. magnetically vs thermally driven), and can only be understood by directly confronting th
Externí odkaz:
http://arxiv.org/abs/2210.15486
Publikováno v:
A&A 668, A164 (2022)
We develop a simple iterative scheme to include vertical turbulent mixing and diffusion in ProDiMo thermo-chemical models for protoplanetary discs. The models are carefully checked for convergence toward the time-independent solution of the reaction-
Externí odkaz:
http://arxiv.org/abs/2209.12233
Autor:
Riaz, B., Thi, W. -F.
Deuterium fractionation can constrain the physical and chemical conditions at the early stage of brown dwarf formation. We present IRAM 30m observations over a wide frequency range of 213-279 GHz of singly and doubly deuterated species of formaldehyd
Externí odkaz:
http://arxiv.org/abs/2206.02669
Autor:
Riaz, B., Thi, W. -F.
We have conducted the first extensive observational survey of several deuterated species in 16 Class 0/I proto-brown dwarfs (proto-BDs) and 4 Class Flat/Class II brown dwarfs. Observations were obtained with the IRAM 30m telescope in the DCO$^{+}$ (3
Externí odkaz:
http://arxiv.org/abs/2201.07315
Autor:
Riaz, B., Thi, W. -F.
We report the first detection in the ${\it J}_{{\it K}}$ = 1$_{0}$ - 0$_{0}$ rotational transition line of CH$_{3}$D towards three Class 0/I proto-brown dwarfs (proto-BDs) from IRAM 30 m observations. Assuming a rotational temperature of 25 K, the CH
Externí odkaz:
http://arxiv.org/abs/2201.07064
Autor:
GRAVITY Collaboration, Bouarour, Y. -I., Perraut, K., Ménard, F., Brandner, W., Garatti, A. Caratti o, Caselli, P., van Dishoeck, E., Dougados, C., Garcia-Lopez, R., Grellmann, R., Henning, T., Klarmann, L., Labadie, L., Natta, A., Sanchez-Bermudez, J., Thi, W. -F., de Zeeuw, P. T., Amorim, A., Bauböck, M., Benisty, M., Berger, J. -P., Clenet, Y., Foresto, V. Coudé du, Duvert, G., Eckart, A., Eisenhauer, F., Eupen, F., Filho, M., Gao, F., Garcia, P., Gendron, E., Genzel, R., Gillessen, S., Jiménez-Rosales, A., Jocou, L., Hippler, S., Horrobin, M., Hubert, Z., Kervella, P., Lacour, S., Bouquin, J. -B. Le, Léna, P., Ott, T., Paumard, T., Perrin, G., Pfuhl, O., Rousset, G., Scheithauer, S., Shangguan, J., Stadler, J., Straub, O., Straubmeier, C., Sturm, E., Vincent, F. H., von Fellenberg, S. D., Widmann, F., Wiest, M.
Publikováno v:
A&A 642, A162 (2020)
We use PIONIER data from the ESO archive and GRAVITY data that were obtained in June 2017 with the four 8m telescopes. We use a parametric disk model and the 3D radiative transfer code MCFOST to reproduce the Spectral Energy Distribution and match th
Externí odkaz:
http://arxiv.org/abs/2008.08527
Autor:
Rab, Ch., Kamp, I., Dominik, C., Ginski, C., Muro-Arena, G. A., Thi, W. -F., Waters, L. B. F. M., Woitke, P.
Publikováno v:
A&A 642, A165 (2020)
Spatially resolved continuum observations of planet-forming disks show prominent ring and gap structures in their dust distribution. However, the picture from gas observations is much less clear and constraints on the radial gas density structure (i.
Externí odkaz:
http://arxiv.org/abs/2008.05941