Zobrazeno 1 - 10
of 36
pro vyhledávání: '"Bedard, Antoine"'
Autor:
Kilic, Mukremin, Bergeron, Pierre, Blouin, Simon, Moss, Adam, Brown, Warren R., Bedard, Antoine, Jewett, Gracyn, Agueros, Marcel A.
We increase the spectroscopic completeness of the 100 pc white dwarf sample in the SDSS footprint with 840 additional spectra. Our spectroscopy is 86% complete for white dwarfs hotter than $T_{\rm eff}= 5000$ K, where H$\alpha$ remains visible and pr
Externí odkaz:
http://arxiv.org/abs/2412.04611
Publikováno v:
Nature 627, 286-288 (2024)
White dwarfs are stellar remnants devoid of a nuclear energy source, gradually cooling over billions of years and eventually freezing into a solid state from the inside out. Recently, it was discovered that a population of freezing white dwarfs maint
Externí odkaz:
http://arxiv.org/abs/2409.04419
Autor:
Munday, James, Pelisoli, Ingrid, Tremblay, P. E., Marsh, T. R., Nelemans, Gijs, Bédard, Antoine, Toonen, Silvia, Breedt, Elmé, Cunningham, Tim, O'Brien, Mairi W., Dawson, Harry
We present the first discoveries of the double-lined double white dwarf (DBL) survey that targets over-luminous sources with respect to the canonical white dwarf cooling sequence according to a set of well-defined criteria. The primary goal of the DB
Externí odkaz:
http://arxiv.org/abs/2407.02594
Autor:
Bédard, Antoine
White dwarfs are the dense, burnt-out remnants of the vast majority of stars, condemned to cool over billions of years as they steadily radiate away their residual thermal energy. To first order, their atmosphere is expected to be made purely of hydr
Externí odkaz:
http://arxiv.org/abs/2405.01268
Autor:
Tremblay, Pier-Emmanuel, Bédard, Antoine, O'Brien, Mairi W., Munday, James, Elms, Abbigail K., Fusillo, Nicola Pietro Gentillo, Sahu, Snehalata
This review highlights the role of the Gaia space mission in transforming white dwarf research. These stellar remnants constitute 5-7% of the local stellar population in volume, yet before Gaia the lack of trigonometric parallaxes hindered their iden
Externí odkaz:
http://arxiv.org/abs/2402.14960
We perform nonlocal thermodynamic equilibrium (NLTE) model atmosphere analyses of the three hottest hypervelocity stars (space velocities between $\approx$ 1500-2800 km s$^{-1}$) known to date, which were recently discovered spectroscopically and ide
Externí odkaz:
http://arxiv.org/abs/2311.13388
The convective dredge-up of carbon from the interiors of hydrogen-deficient white dwarfs has long been invoked to explain the presence of carbon absorption features in the spectra of cool DQ stars ($T_{\rm eff} < 10{,}000\,{\rm K}$). It has been hypo
Externí odkaz:
http://arxiv.org/abs/2307.14295
Autor:
Elms, Abbigail K., Tremblay, Pier-Emmanuel, Gänsicke, Boris T., Swan, Andrew, Melis, Carl, Bédard, Antoine, Manser, Christopher J., Munday, James, Hermes, J. J., Dennihy, Erik, Nitta, Atsuko, Zuckerman, Ben
Publikováno v:
MNRAS, 524, 4996 (2023)
Two recently discovered white dwarfs, WDJ041246.84$+$754942.26 and WDJ165335.21$-$100116.33, exhibit H$\alpha$ and H$\beta$ Balmer line emission similar to stars in the emerging DAHe class, yet intriguingly have not been found to have detectable magn
Externí odkaz:
http://arxiv.org/abs/2307.09186
The observational signature of core crystallization of white dwarfs has recently been discovered. However, the magnitude of the crystallization-powered cooling delay required to match observed white dwarfs is larger than predicted by conventional mod
Externí odkaz:
http://arxiv.org/abs/2306.03140
Autor:
Kosakowski, Alekzander, Brown, Warren R., Kilic, Mukremin, Kupfer, Thomas, Bédard, Antoine, Gianninas, A., Agüeros, Marcel A., Barrientos, Manuel
We present the results from our ongoing spectroscopic survey targeting low mass white dwarf binaries, focusing on the southern sky. We used a Gaia DR2 and eDR3 based selection and identified 28 new binaries, including 19 new extremely low mass white
Externí odkaz:
http://arxiv.org/abs/2305.03079