Zobrazeno 1 - 10
of 351
pro vyhledávání: '"Vauclair, G."'
A non negligible fraction of white dwarf stars show the presence of heavy elements in their atmospheres. The most accepted explanation for this contamination is the accretion of material coming from tidally disrupted planetesimals, which form a debri
Externí odkaz:
http://arxiv.org/abs/2109.11370
Autor:
Fu, J. -N., Vauclair, G., Su, J., Machado, L. Fox, Colas, F., Kim, S. -L., Cang, T. Q., Li, C., Niu, H. B., Xue, H. F., Li, Y., Jiang, X. -J., Michel, R., Alvarez, M., Dolez, N., Ma, L., Esamdin, A., Liu, J. Z.
An increasing number of white dwarf stars show atmospheric chemical composition polluted by heavy elements accreted from debris disk material. The existence of such debris disks strongly suggests the presence of one or more planet(s) whose gravitatio
Externí odkaz:
http://arxiv.org/abs/1904.07586
White dwarfs are compact objects with atmospheres containing mainly light elements, hydrogen or helium. Because of their surface high gravitational field, heavy elements diffuse downwards in a very short timescale compared to the evolutionary timesca
Externí odkaz:
http://arxiv.org/abs/1812.09405
Autor:
Li, C., Fu, J. -N., Vauclair, G., Dolez, N., Fox-Machedo, L., Michel, R., Chavez, M., Bertone, E.
Publikováno v:
Monthly Notices of the Royal Astronomical Society, Volume 449, Issue 4, p.3360-3369, 2015
Asteroseismology is a unique tool to explore the internal structure of stars through both observational and theoretical research. The internal structure of pulsating hydrogen shell white dwarfs (ZZ Ceti stars) detected by asteroseismology is regarded
Externí odkaz:
http://arxiv.org/abs/1709.09206
Publikováno v:
A&A 601, A127 (2017)
A precision of order one percent is needed on the parameters of exoplanet-hosts stars in order to correctly characterize the planets themselves. This will be achieved by asteroseismology. It is important in this context to test the influence on the d
Externí odkaz:
http://arxiv.org/abs/1702.03170
Publikováno v:
A&A 601, A13 (2017)
A large fraction of white dwarf stars shows photospheric chemical composition polluted by heavy elements accreted from a debris disk. Such debris disks result from the tidal disruption of rocky planetesimals which had survived to whole stellar evolut
Externí odkaz:
http://arxiv.org/abs/1612.09320
Publikováno v:
A&A 585, A22 (2016)
Aims. We use the Kepler data accumulated on the pulsating DB white dwarf KIC 08626021 to explore in detail the stability of its oscillation modes, searching in particular for evidences of nonlinear behaviors. Methods. We analyse nearly two years of u
Externí odkaz:
http://arxiv.org/abs/1510.06884
Publikováno v:
2015ASPC..493..261Z
The Kepler spacecraft provides new opportunities to search for long term frequency and amplitude modulations of oscillation modes in pulsating stars. We ana- lyzed nearly two years of uninterrupted data obtained with this instrument on the DBV star K
Externí odkaz:
http://arxiv.org/abs/1510.06877
Publikováno v:
Astronomy & Astrophysics, 2013, Volume 557, id.L12, 4 pp
Recent observations of a large number of DA and DB white dwarfs show evidence of debris disks, which are the remnants of old planetary systems. The infrared excess detected with \emph{Spitzer} and the lines of heavy elements observed in their atmosph
Externí odkaz:
http://arxiv.org/abs/1308.5406
Autor:
Fu, J. -N., Dolez, N., Vauclair, G., Machado, L. Fox, Kim, S. -L., Li, C., Chen, L., Alvarez, M., Su, J., Charpinet, S., Chevreton, M., Michel, R., Yang, X. H., Li, Y., Zhang, Y. P., Molnar, L., Plachy, E.
The pulsating DA white dwarfs (ZZ Ceti stars) are $g$-mode non-radial pulsators. Asteroseismology provides strong constraints on their global parameters and internal structure. Since all the DA white dwarfs falling in the ZZ Ceti instability strip do
Externí odkaz:
http://arxiv.org/abs/1211.6226