Zobrazeno 1 - 10
of 190
pro vyhledávání: '"John D. Landstreet"'
Publikováno v:
The Astrophysical Journal Letters, Vol 963, Iss 1, p L22 (2024)
Dynamically active planetary systems orbit a significant fraction of white dwarf stars. These stars often exhibit surface metals accreted from debris disks, which are detected through infrared excess or transiting structures. However, the full journe
Externí odkaz:
https://doaj.org/article/131a290cce9e4485a12bf7d312ea4b54
Publikováno v:
The Astrophysical Journal, Vol 952, Iss 2, p 129 (2023)
WD 0810-353 is a white dwarf within the 20 pc volume around the Sun. Using Gaia astrometric distance and proper motions, and a radial velocity derived from Gaia spectroscopy, it has been predicted that this star will pass within 1 pc of the solar sys
Externí odkaz:
https://doaj.org/article/4714edf960654678a3d4ec04ad1f7f58
Autor:
John D. Landstreet, David J. Wilson, Jeremy J. Drake, J. J. Hermes, Detlev Koester, Boris T. Gänsicke, Odette Toloza
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 508:561-574
We present the discovery of a magnetic field on the white dwarf component in the detached post common envelope binary (PCEB) CC Cet. Magnetic white dwarfs in detached PCEBs are extremely rare, in contrast to the high incidence of magnetism in single
Autor:
Andrei V. Berdyugin, Vilppu Piirola, Stefano Bagnulo, John D. Landstreet, Svetlana V. Berdyugina
Publikováno v:
Astronomy & Astrophysics. 670:A2
About half of white dwarfs (WDs) evolve to the DC state as they cool; the others become DQ or (temporarily?) DZ WDs. The recent magnetic survey of the local 20 pc volume has established a high frequency of magnetic fields among WDs older than 2-3 Gyr
Circular polarisation measurements of white dwarfs of various ages and spectral types are useful to understand the origin and evolution of the magnetic field in degenerate stars. In the latest stages of white dwarf evolution, when stars are so cool t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a40663728de0fb188197d6033cfba0cc
http://arxiv.org/abs/2111.11174
http://arxiv.org/abs/2111.11174
Autor:
John D. Landstreet, Eva Villaver, Nicola Pietro Gentile Fusillo, Farzana Meru, Dimitri Veras, David J. Wilson, Siyi Xu, Melania Del Santo, Melvyn B. Davies, Wladimir Lyra, Siegfried Eggl, Paula Izquierdo, Silvia Toonen, Sabine Reffert, Roberto Silvotti, Matthew R. Burleigh, Mark Hollands, Pablo Rodríguez-Gil, Roberto Raddi, Odette Toloza, D. de Martino, Jay Farihi, Alexander J. Mustill, Steven G. Parsons, Simon Portegies Zwart, Andreas Quirrenbach, Detlev Koester, Christopher J. Manser, Matthias R. Schreiber, Boris T. Gänsicke, Mark C. Wyatt, Tom Marsh
Publikováno v:
Science, 364(6435), 66-69. American Association for the Advancement of Science
Science, 364(6435), 66-69
Science, 364(6435), 66-69
Many white dwarf stars show signs of having accreted smaller bodies, implying that they may host planetary systems. A small number of these systems contain gaseous debris discs, visible through emission lines. We report a stable 123.4min periodic var
Evidence for mass accretion driven by spiral shocks onto the white dwarf in SDSS J123813.73–033933.0
Autor:
Roger D. Pickard, Elmé Breedt, Daniel E. Reichart, A. Aungwerojwit, Matthias R. Schreiber, Christian Knigge, Boris T. Gänsicke, D. de Martino, Anna F. Pala, B. Monard, Steven G. Parsons, V. S. Dhillon, Rod Stubbings, T. R. Marsh, Gary Poyner, P. Godon, Peter Nelson, Franz-Josef Hambsch, Paula Szkody, Lian-Tao Wang, John D. Landstreet, G. Myers, Dean M. Townsley, J. J. Hermes
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 483:1080-1103
We present high-time-resolution photometry and phase-resolved spectroscopy of the short-period ($P_\mathrm{orb} = 80.52\,\mathrm{min}$) cataclysmic variable SDSS J123813.73-033933.0, observed with the $\mathit{Hubble}$ $\mathit{Space}$ $\mathit{Teles
Autor:
Stefano Bagnulo, Christopher J. Manser, M. Hart, J. J. Hermes, A. Wallach, Nicholas Achilleos, John D. Landstreet, T. R. Marsh, Jay Farihi, Nikolay Walters
Despite thousands of spectroscopic detections, only four isolated white dwarfs exhibit Balmer emission lines. The temperature inversion mechanism is a puzzle over 30 years old that has defied conventional explanations. One hypothesis is a unipolar in
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e7a68b5da117a43ee3eac105c6620fb4
Autor:
John D. Landstreet, Stefano Bagnulo
Many stars evolve into magnetic white dwarfs, and observations may help to understand when the magnetic field appears at the stellar surface, if and how it evolves during the cooling phase, and what are the mechanisms that generate it. After obtainin
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::717a96d77e99cc288b24895f6f88503a
Autor:
R. Fine, Véronique Petit, G. Henson, Alexandre David-Uraz, Gregg A. Wade, Matt Shultz, Asif ud-Doula, MiMeS, David A. Bohlender, John D. Landstreet, Th. Rivinius, Coralie Neiner, Evelyne Alecian, Oleg Kochukhov, P. Cerrahoğlu, BinaMIcS Collaborations, J. Sikora, Stan Owocki
Publikováno v:
Monthly Notices of the Royal Astronomical Society
Monthly Notices of the Royal Astronomical Society, Oxford University Press (OUP): Policy P-Oxford Open Option A, 2020, 499 (4), pp.5379-5395. ⟨10.1093/mnras/staa3102⟩
Monthly Notices of the Royal Astronomical Society, Oxford University Press (OUP): Policy P-Oxford Open Option A, 2020, 499 (4), pp.5379-5395. ⟨10.1093/mnras/staa3102⟩
Rapidly rotating early-type stars with strong magnetic fields frequently show H$\alpha$ emission originating in Centrifugal Magnetospheres (CMs), circumstellar structures in which centrifugal support due to magnetically enforced corotation of the mag
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b7723d1a9bdea3364442428582b1a3fc
https://nrc-publications.canada.ca/eng/view/object/?id=0324728a-3e78-4167-b2eb-f256acf46d61
https://nrc-publications.canada.ca/eng/view/object/?id=0324728a-3e78-4167-b2eb-f256acf46d61