Zobrazeno 1 - 10
of 38
pro vyhledávání: '"Abgrall, Hervé"'
Publikováno v:
A&A 669, L7 (2023)
Context. Highly excited molecular hydrogen H2 has been observed in many regions of shocked molecular gas. A recently published $K$-band spectrum of Herbig-Haro 7 (HH7) contains several vibration-rotation lines of H2 from highly excited energy levels
Externí odkaz:
http://arxiv.org/abs/2301.00741
The FUV continuum spectrum of many accreting pre-main sequence stars, Classical T Tauri Stars (CTTSs), does not continue smoothly from the well-studied Balmer continuum emission in the NUV, suggesting that additional processes contribute to the short
Externí odkaz:
http://arxiv.org/abs/1706.09940
The far-ultraviolet (FUV; 912--1700 \AA) radiation field from accreting central stars in Classical T Tauri systems influences the disk chemistry during the period of giant planet formation. Previous efforts to measure the true stellar+accretion-gener
Externí odkaz:
http://arxiv.org/abs/1402.6341
Autor:
Ardila, David R., Herczeg, Gregory J., Gregory, Scott G., Ingleby, Laura, France, Kevin, Brown, Alexander, Edwards, Suzan, Johns-Krull, Christopher, Linsky, Jeffrey L., Yang, Hao, Valenti, Jeff A., Abgrall, Hervé, Alexander, Richard D., Bergin, Edwin, Bethell, Thomas, Brown, Joanna M., Calvet, Nuria, Espaillat, Catherine, Hillenbrand, Lynne A., Hussain, Gaitee, Roueff, Evelyne, Schindhelm, Rebecca, Walter, Frederick M.
For Classical T Tauri Stars (CTTSs), the resonance lines of N V, Si IV, and C IV, as well as the He II 1640 A line, act as diagnostics of the accretion process. Here we assemble a large high-resolution dataset of these lines in CTTSs and Weak T Tauri
Externí odkaz:
http://arxiv.org/abs/1304.3746
Autor:
France, Kevin, Schindhelm, Rebecca, Herczeg, Gregory J., Brown, Alexander, Abgrall, Herve, Alexander, Richard D., Bergin, Edwin A., Brown, Joanna M., Linsky, Jeffrey L., Roueff, Evelyne, Yang, Hao
The formation timescale and final architecture of exoplanetary systems are closely related to the properties of the molecular disks from which they form. Observations of the spatial distribution and lifetime of the molecular gas at planet-forming rad
Externí odkaz:
http://arxiv.org/abs/1207.4789
Autor:
Ingleby, Laura, Calvet, Nuria, Bergin, Edwin, Herczeg, Gregory, Brown, Alexander, Alexander, Richard, Edwards, Suzan, Espaillat, Catherine, France, Kevin, Gregory, Scott G., Hillenbrand, Lynne, Roueff, Evelyne, Valenti, Jeff, Walter, Frederick, Johns-Krull, Christopher, Brown, Joanna, Linsky, Jeffrey, McClure, Melissa, Ardila, David, Abgrall, Herve, Bethell, Thomas, Hussain, Gaitee, Yang, Hao
Young stars surrounded by disks with very low mass accretion rates are likely in the final stages of inner disk evolution and therefore particularly interesting to study. We present ultraviolet (UV) observations of the ~5-9 Myr old stars RECX-1 and R
Externí odkaz:
http://arxiv.org/abs/1110.6312
Autor:
France, Kevin, Burgh, Eric B., Herczeg, Gregory J., Schindhelm, Rebecca, Yang, Hao, Abgrall, Herve, Roueff, Evelyne, Brown, Alexander, Brown, Joanna, Linsky, Jeffrey L.
The direct study of molecular gas in inner protoplanetary disks is complicated by uncertainties in the spatial distribution of the gas, the time-variability of the source, and the comparison of observations across a wide range of wavelengths. Some of
Externí odkaz:
http://arxiv.org/abs/1109.1831
Autor:
France, Kevin, Schindhelm, Rebecca, Burgh, Eric B., Herczeg, Gregory J., Harper, Graham M., Brown, Alexander, Green, James C., Linsky, Jeffrey L., Yang, Hao, Abgrall, Hervé, Ardila, David R., Bergin, Edwin, Bethell, Thomas, Brown, Joanna M., Calvet, Nuria, Espaillat, Catherine, Gregory, Scott G., Hillenbrand, Lynne A., Hussain, Gaitee, Ingleby, Laura, Johns-Krull, Christopher M., Roueff, Evelyne, Valenti, Jeff A., Walter, Frederick M.
We exploit the high sensitivity and moderate spectral resolution of the $HST$-Cosmic Origins Spectrograph to detect far-ultraviolet spectral features of carbon monoxide (CO) present in the inner regions of protoplanetary disks for the first time. We
Externí odkaz:
http://arxiv.org/abs/1104.0670
Autor:
Ingleby, Laura, Calvet, Nuria, Bergin, Edwin, Yerasi, Ashwin, Espaillat, Catherine, Herczeg, Gregory, Roueff, Evelyne, Abgrall, Herve, Hernandez, Jesus, Briceno, Cesar, Pascucci, Ilaria, Miller, Jon, Fogel, Jeffrey, Hartmann, Lee, Meyer, Michael, Carpenter, John, Crockett, Nathan, McClure, Melissa
Publikováno v:
Astrophys.J.703:L137-L141,2009
We analyze the far-ultraviolet (FUV) spectra of 33 classical T Tauri stars (CTTS), including 20 new spectra obtained with the Advanced Camera for Surveys Solar Blind Channel (ACS/SBC) on the Hubble Space Telescope. Of the sources, 28 are in the ~1 My
Externí odkaz:
http://arxiv.org/abs/0909.0688
Autor:
Bergin, Edwin A., Calvet, Nuria, Sitko, Michael L., Abgrall, Herve, D'Alessio, Paola, Herczeg, Gregory J., Roueff, Evelyne, Qi, Chunhua, Lynch, David K., Russell, Ray W., Brafford, Suellen M., Perry, R. Brad
Publikováno v:
Astrophys.J. 614 (2004) L133-L136
We present new observations of the FUV (1100-2200 Angstrom) radiation field and the near- to mid-IR (3--13.5 micron) spectral energy distribution (SED) of a sample of T Tauri stars selected on the basis of bright molecular disks (GM Aur, DM Tau, LkCa
Externí odkaz:
http://arxiv.org/abs/astro-ph/0409308