Zobrazeno 1 - 10
of 28
pro vyhledávání: '"Lefevre, Charlène"'
Publikováno v:
A&A 688, A118 (2024)
Molecular deuteration is commonly seen in starless cores and is expected to occur on a timescale comparable to that of the core contraction. Thus, the deuteration serves as a chemical clock, allowing us to investigate dynamical theories of core forma
Externí odkaz:
http://arxiv.org/abs/2405.13317
Autor:
Diaz-Rodriguez, Ana K., Anglada, Guillem, Blázquez-Calero, Guillermo, Osorio, Mayra, Gómez, José F., Fuller, Gary A., Estalella, Robert, Torrelles, José M., Cabrit, Sylvie, Rodríguez, Luis F., Lefèvre, Charlène, Macías, Enrique, Carrasco-González, Carlos, Zapata, Luis A., de Gregorio-Monsalvo, Itziar, Ho, Paul T. P.
We present VLA and ALMA observations of the close (0.3" = 90 au separation) protobinary system SVS 13. We detect two small circumstellar disks (radii $\sim$12 and $\sim$9 au in dust, and $\sim$30 au in gas) with masses of $\sim$0.004-0.009 $M_{sun}$
Externí odkaz:
http://arxiv.org/abs/2111.11787
Autor:
Hinkley, Sasha, Matthews, Elisabeth C., Lefevre, Charlène, Lestrade, Jean-Francois, Kennedy, Grant, Mawet, Dimitri, Stapelfeldt, Karl R., Ray, Shrishmoy, Mamajek, Eric, Bowler, Brendan P., Wilner, David, Williams, Jonathan, Ansdell, Megan, Wyatt, Mark, Lau, Alexis, Fernandez, Mark W. Phillips Jorge Fernandez, Gagné, Jonathan, Bubb, Emma, Sutlieff, Ben J., Wilson, Thomas J. G., Matthews, Brenda, Ngo, Henry, Piskorz, Danielle, Crepp, Justin R., Gonzalez, Erica, Mann, Andrew W., Mace, Gregory
We report the discovery of a circumstellar debris disk viewed nearly edge-on and associated with the young, K1 star BD+45$^{\circ}$598 using high-contrast imaging at 2.2$\mu$m obtained at the W.M.~Keck Observatory. We detect the disk in scattered lig
Externí odkaz:
http://arxiv.org/abs/2103.12824
The properties of interstellar grains, such as grain size distribution and grain porosity, are affected by interstellar processing, in particular, coagulation and shattering, which take place in the dense and diffuse interstellar medium (ISM), respec
Externí odkaz:
http://arxiv.org/abs/2101.02365
Publikováno v:
A&A 643, A126 (2020)
Aims. Radio observing efficiency can be improved by calibrating and reducing the observations in total power mode rather than in frequency, beam, or position-switching modes. Methods. We selected a sample of spectra obtained from the Institut de Radi
Externí odkaz:
http://arxiv.org/abs/2010.00461
Publikováno v:
A&A 635, A188 (2020)
The deuterium fractionation in starless cores gives us a clue to estimate their lifetime scales, thus allowing us to distinguish between different dynamical theories of core formation. Cores also seem to be subject to a differential N2 and CO depleti
Externí odkaz:
http://arxiv.org/abs/2002.01346
IRAM operates two observatories - the 30-meter Telescope on Pico Veleta in Spain and NOEMA, an interferometer of ten 15-meter antennas on Plateau de Bure in France. Both observatories allow to observe at millimeter wavelengths. Here, we aim at discus
Externí odkaz:
http://arxiv.org/abs/1911.03248
Autor:
Lefèvre, Charlène, Pagani, Laurent, Ladjelate, Bilal, Min, Michiel, Hirashita, Hiroyuki, Zylka, Robert
Dust grains are the building {blocks} of future planets. They evolve in size, shape and composition during the life cycle of the interstellar medium. We seek to understand the process which leads from diffuse medium grains to dust grains in the vicin
Externí odkaz:
http://arxiv.org/abs/1911.03257
Autor:
Lefèvre, Charlène, Cabrit, Sylvie, Maury, Anaëlle J., Gueth, Frederic, Tabone, Benoît, Podio, Linda, Belloche, Arnaud, Codella, Claudio, Maret, Sébastien, Anderl, Sybille, André, Philippe, Hennebelle, Patrick
Publikováno v:
A&A 604, L1 (2017)
Aims. We wish to clarify the origin of the multiple jet features emanating from the binary protostar SVS 13A (= VLA4A/VLA4B). Methods. We used the Plateau de Bure Interferometer to map at 0.3-0.8" (~70-190 au) dust emission at 1.4 mm, CO(2-1), SiO(5-
Externí odkaz:
http://arxiv.org/abs/1707.02262
Autor:
Wolff, Schuyler G., Menard, Francois, Caceres, Claudio, Lefevre, Charlene, Bonnefoy, Mickael, Canovas, Hector, Maret, Sebastien, Pinte, Christophe, Schreiber, Matthias R., van der Plas, Gerrit
DH Tau is a young ($\sim$1 Myr) classical T Tauri star. It is one of the few young PMS stars known to be associated with a planetary mass companion, DH Tau b, orbiting at large separation and detected by direct imaging. DH Tau b is thought to be accr
Externí odkaz:
http://arxiv.org/abs/1705.08470