Zobrazeno 1 - 10
of 2 621
pro vyhledávání: '"Köster D"'
Autor:
Garbutt, J. A., Parsons, S. G., Toloza, O., Gänsicke, B. T., Hernandez, M. S., Koester, D., Lagos, F., Raddi, R., Rebassa-Mansergas, A., Ren, J. J., Schreiber, M. R., Zorotovic, M.
White dwarfs with a F, G or K type companion represent the last common ancestor for a plethora of exotic systems throughout the galaxy, though to this point very few of them have been fully characterised in terms of orbital period and component masse
Externí odkaz:
http://arxiv.org/abs/2403.07985
Autor:
O'Brien, Mairi W., Tremblay, P. -E., Klein, B. L., Koester, D., Melis, C., Bédard, A., Cukanovaite, E., Cunningham, T., Doyle, A. E., Gänsicke, B. T., Fusillo, N. P. Gentile, Hollands, M. A., McCleery, J., Pelisoli, I., Toonen, S., Weinberger, A. J., Zuckerman, B.
Publikováno v:
MNRAS 527, 3 (2024) 8687-8705
We present a comprehensive overview of a volume-complete sample of white dwarfs located within 40 pc of the Sun, a significant proportion of which were detected in Gaia Data Release 3 (DR3). Our DR3 sample contains 1076 spectroscopically confirmed wh
Externí odkaz:
http://arxiv.org/abs/2312.02735
Autor:
Parsons, S. G., Hernandez, M. S., Toloza, O., Zorotovic, M., Schreiber, M. R., Gänsicke, B. T., Lagos, F., Raddi, R., Rebassa-Mansergas, A., Ren, J. J., Koester, D.
Virtually all binaries consisting of a white dwarf with a non-degenerate companion can be classified as either close post-interaction systems (with orbital periods of a few days or less), or wide systems (with periods longer than decades), in which b
Externí odkaz:
http://arxiv.org/abs/2211.08440
Ultraviolet and optical spectra of the hydrogen-dominated atmosphere white dwarf star G238-44 obtained with FUSE, Keck/HIRES, HST/COS, and HST/STIS reveal ten elements heavier than helium: C, N, O, Mg, Al, Si, P, S, Ca, and Fe. G238-44 is only the th
Externí odkaz:
http://arxiv.org/abs/2211.02673
Autor:
O'Brien, Mairi W., Tremblay, P. -E., Fusillo, N. P. Gentile, Hollands, M. A., Gaensicke, B. T., Koester, D., Pelisoli, I., Cukanovaite, E., Cunningham, T., Doyle, A. E., Elms, A., Farihi, J., Hermes, J. J., Holberg, J., Jordan, S., Klein, B. L., Kleinman, S. J., Manser, C. J., De Martino, D., Marsh, T. R., McCleery, J., Melis, C., Nitta, A., Parsons, S. G., Raddi, R., Rebassa-Mansergas, A., Schreiber, M. R., Silvotti, R., Steeghs, D., Toloza, O., Toonen, S., Torres, S., Weinberger, A. J., Zuckerman, B.
We present a spectroscopic survey of 248 white dwarf candidates within 40 pc of the Sun; of these 244 are in the southern hemisphere. Observations were performed mostly with the Very Large Telescope (X-Shooter) and Southern Astrophysical Research Tel
Externí odkaz:
http://arxiv.org/abs/2210.01608
Autor:
Raddi, R., Torres, S., Rebassa-Mansergas, A., Maldonado, J., Camisassa, M. E., Koester, D., Fusillo, N. P. Gentile, Tremblay, P. -E., Dimpel, M., Heber, U., Cunningham, T., Ren, J. -J.
Publikováno v:
A&A 658, A22 (2022)
We present the first detailed 3D kinematic analysis of a sample of 3133 white dwarfs that use Gaia astrometry plus radial velocities, which were measured either by Gaia or by ground based spectroscopic observations. The sample includes either isolate
Externí odkaz:
http://arxiv.org/abs/2111.01145
Autor:
Rebassa-Mansergas, A., Maldonado, J., Raddi, R., Knowles, A. T., Torres, S., Hoskin, M., Cunningham, T., Hollands, M., Ren, J., Gaensicke, B. T., Tremblay, P. -E., Castro-Rodriguez, N., Camisassa, M., Koester, D.
The age-metallicity relation is a fundamental tool for constraining the chemical evolution of the Galactic disc. In this work we analyse the observational properties of this relation using binary stars that have not interacted consisting of a white d
Externí odkaz:
http://arxiv.org/abs/2105.13379
Autor:
Egea, E. González, Raddi, R., Koester, D., Rogers, L. K., Marocco, F., Cooper, W. J., Beamin, J. C., Burningham, B., Day-Jones, A., Forbrich, J., Pinfield, D. J.
Spectroscopic observations of white dwarfs reveal that many of them are polluted by exoplanetary material, whose bulk composition can be uniquely probed this way. We present a spectroscopic and photometric analysis of the DA white dwarf WDJ181417.84$
Externí odkaz:
http://arxiv.org/abs/2012.05731
Autor:
Fusillo, N. P. Gentile, Manser, C. J., Gänsicke, Boris T., Toloza, O., Koester, D., Dennihy, E., Brown, W. R., Farihi, J., Hollands, M. A., Hoskin, M. J., Izquierdo, P., Kinnear, T., Marsh, T. R., Santamaria-Miranda, A., Pala, A. F., Redfield, S., Rodriguez-Gil, P., Schreiber, M. R., Veras, D., Wilson, D. J.
Publikováno v:
2021, MNRAS, 504, 2707
White dwarfs with emission lines from gaseous debris discs are among the rarest examples of planetary remnant hosts, but at the same time they are key objects for studying the final evolutionary stage of planetary systems. Making use of the large num
Externí odkaz:
http://arxiv.org/abs/2010.13807
Autor:
Tremblay, P. -E., Hollands, M. A., Fusillo, N. P. Gentile, McCleery, J., Izquierdo, P., Gänsicke, B. T., Cukanovaite, E., Koester, D., Brown, W. R., Charpinet, S., Cunningham, T., Farihi, J., Giammichele, N., van Grootel, V., Hermes, J. J., Hoskin, M. J., Jordan, S., Kepler, S. O., Kleinman, S. J., Manser, C. J., Marsh, T. R., de Martino, D., Nitta, A., Parsons, S. G., Pelisoli, I., Raddi, R., Rebassa-Mansergas, A., Ren, J. -J., Schreiber, M. R., Silvotti, R., Toloza, O., Toonen, S., Torres, S.
We present a spectroscopic survey of 230 white dwarf candidates within 40 pc of the Sun from the William Herschel Telescope and Gran Telescopio Canarias. All candidates were selected from $\textit{Gaia}$ Data Release 2 (DR2) and in almost all cases h
Externí odkaz:
http://arxiv.org/abs/2006.00965