Zobrazeno 1 - 10
of 249
pro vyhledávání: '"Gregory, S G"'
Autor:
Sicilia-Aguilar, A., Campbell-White, J., Roccatagliata, V., Desira, J., Gregory, S. G., Scholz, A., Fang, M., de Miera, F. Cruz-Saenz, Kóspál, Á., Matsumura, S., Ábrahám, P.
We examine the long-term spectroscopic and photometric variability of EX~Lupi and TW~Hya, studying the presence of stable accretion and the role it plays in the observed variability. Analysing the velocity modulations of the emission lines with STAR-
Externí odkaz:
http://arxiv.org/abs/2310.02681
Autor:
Hill, C. A., Folsom, C. P., Donati, J. -F., Herczeg, G. J., Hussain, G. A. J., Alencar, S. H. P., Gregory, S. G., collaboration, the MaTYSSE
We present a spectropolarimetric study of two weak-line T Tauri stars (wTTSs), TWA 6 and TWA 8A, as part of the MaTYSSE (Magnetic Topologies of Young Stars and the Survival of close-in giant Exoplanets) program. Both stars display significant Zeeman
Externí odkaz:
http://arxiv.org/abs/1902.06725
Autor:
Alencar, S. H. P., Bouvier, J., Donati, J. -F., Alecian, E., Folsom, C. P., Grankin, K., Hussain, G. A. J., Hill, C., Cody, A. -M., Carmona, A., Dougados, C., Gregory, S. G., Herczeg, G., Ménard, F., Moutou, C., Malo, L., Takami, M., collaboration, the MaTYSSE
Publikováno v:
A&A 620, A195 (2018)
Magnetospheric accretion has been thoroughly studied in young stellar systems with full non-evolved accretion disks, but it is poorly documented for transition disk objects with large inner cavities. We aim at characterizing the star-disk interaction
Externí odkaz:
http://arxiv.org/abs/1811.04806
Autor:
Hill, C. A., Carmona, A., Donati, J. -F., Hussain, G. A. J., Gregory, S. G., Alencar, S. H. P., Bouvier, J., collaboration, the MaTYSSE
We report the results of our spectropolarimetric monitoring of the weak-line T-Tauri stars (wTTSs) Par 1379 and Par 2244, within the MaTYSSE (Magnetic Topologies of Young Stars and the Survival of close-in giant Exoplanets) programme. Both stars are
Externí odkaz:
http://arxiv.org/abs/1708.09693
Autor:
Yu, L., Donati, J. -F., Hébrard, E. M., Moutou, C., Malo, L., Grankin, K., Hussain, G., Cameron, A. Collier, Vidotto, A. A., Baruteau, C., Alencar, S. H. P., Bouvier, J., Petit, P., Takami, M., Herczeg, G., Gregory, S. G., Jardine, M., Morin, J., Ménard, F., collaboration, the MaTYSSE
We report the results of an extended spectropolarimetric and photometric monitoring of the weak-line T Tauri star TAP 26, carried out within the MaTYSSE programme with the ESPaDOnS spectropolarimeter at the 3.6 m Canada-France-Hawaii Telescope. Apply
Externí odkaz:
http://arxiv.org/abs/1701.01512
Autor:
Donati, J. -F., Yu, L., Moutou, C., Cameron, A. C., Malo, L., Grankin, K., Hébrard, E., Hussain, G. A. J., Vidotto, A. A., Alencar, S. H. P., Haywood, R. D., Bouvier, J., Petit, P., Takami, M., Herczeg, G. J., Gregory, S. G., Jardine, M. M., Morin, J., collaboration, the MaTYSSE
We report results of an extended spectropolarimetric and photometric monitoring of the weak-line T Tauri star V830 Tau and its recently-detected newborn close-in giant planet. Our observations, carried out within the MaTYSSE programme, were spread ov
Externí odkaz:
http://arxiv.org/abs/1611.02055
Autor:
See, V., Jardine, M., Vidotto, A. A., Donati, J. -F., Saikia, S. Boro, Bouvier, J., Fares, R., Folsom, C. P., Gregory, S. G., Hussain, G., Jeffers, S. V., Marsden, S. C., Morin, J., Moutou, C., Nascimento Jr, J. D. do, Petit, P., Waite, I. A.
Zeeman Doppler imaging has successfully mapped the large-scale magnetic fields of stars over a large range of spectral types, rotation periods and ages. When observed over multiple epochs, some stars show polarity reversals in their global magnetic f
Externí odkaz:
http://arxiv.org/abs/1610.03737
Autor:
See, V., Jardine, M., Vidotto, A. A., Donati, J. -F., Folsom, C. P., Saikia, S. Boro, Bouvier, J., Fares, R., Gregory, S. G., Hussain, G., Jeffers, S. V., Marsden, S. C., Morin, J., Moutou, C., Nascimento Jr, J. D. do, Petit, P., Rosen, L., Waite, I. A.
Spectropolarimetric observations have been used to map stellar magnetic fields, many of which display strong bands of azimuthal fields that are toroidal. A number of explanations have been proposed to explain how such fields might be generated though
Externí odkaz:
http://arxiv.org/abs/1508.01403
Autor:
Donati, J. -F., Hebrard, E., Hussain, G., Moutou, C., Grankin, K., Boisse, I., Morin, J., Gregory, S. G., Vidotto, A. A., Bouvier, J., Alencar, S. H. P., Delfosse, X., Doyon, R., Takami, M., Jardine, M. M., Fares, R., Cameron, A. C., Menard, F., Dougados, C., Herczeg, G., collaboration, the MaTYSSE
We report results of a spectropolarimetric and photometric monitoring of the weak-line T Tauri star LkCa4 within the MaTYSSE programme, involving ESPaDOnS at the Canada-France-Hawaii Telescope. Despite an age of only 2Myr and a similarity with protot
Externí odkaz:
http://arxiv.org/abs/1408.3273
Autor:
Vidotto, A. A., Gregory, S. G., Jardine, M., Donati, J. -F., Petit, P., Morin, J., Folsom, C. P., Bouvier, J., Cameron, A. C., Hussain, G., Marsden, S., Waite, I. A., Fares, R., Jeffers, S., Nascimento Jr, J. D. do
We investigate how the observed large-scale surface magnetic fields of low-mass stars (~0.1 -- 2 Msun), reconstructed through Zeeman-Doppler imaging (ZDI), vary with age t, rotation and X-ray emission. Our sample consists of 104 magnetic maps of 73 s
Externí odkaz:
http://arxiv.org/abs/1404.2733