Zobrazeno 1 - 10
of 13 228
pro vyhledávání: '"Blouin, A."'
Autor:
Aguilera-Gómez, Claudia, Rogers, Laura K., Bonsor, Amy, Jofré, Paula, Blouin, Simon, Shorttle, Oliver, Buchan, Andrew M., Li, Yuqi, Xu, Siyi
Planets form from the same cloud of molecular gas and dust as their host stars. Confirming if planetary bodies acquire the same refractory element composition as their natal disc during formation, and how efficiently volatile elements are incorporate
Externí odkaz:
http://arxiv.org/abs/2411.03454
Cooling ages of white dwarfs are routinely determined by mapping effective temperatures and masses to ages using evolutionary models. Typically, the reported uncertainties on cooling ages only consider the error propagation of the uncertainties on th
Externí odkaz:
http://arxiv.org/abs/2410.14014
Autor:
Venner, Alexander, Limbach, Mary Anne, Mâlin, Mathilde, Blouin, Simon, Boccaletti, Anthony, Pearce, Logan A.
We present the unplanned detection of a white dwarf companion to the star HD 218261 in mid-infrared (10-16 $\mu$m) observations with JWST/MIRI. This star was observed as a calibrator for coronagraphic observations of the exoplanet host HR 8799. HD 21
Externí odkaz:
http://arxiv.org/abs/2410.11568
Infrared-faint white dwarfs are cool white dwarfs exhibiting significant infrared flux deficits, most often attributed to collision-induced absorption (CIA) from H$_2$-He in mixed hydrogen-helium atmospheres. We present James Webb Space Telescope (JW
Externí odkaz:
http://arxiv.org/abs/2409.16224
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:
Blouin, Simon
This chapter provides an in-depth overview of white dwarfs, the evolutionary terminus of the vast majority of stars. It discusses their discovery, their nature as degenerate objects, their connections to earlier phases of stellar evolution, their sub
Externí odkaz:
http://arxiv.org/abs/2409.03941
Autor:
Limbach, Mary Anne, Vanderburg, Andrew, Venner, Alexander, Blouin, Simon, Stevenson, Kevin B., MacDonald, Ryan J., Jenkins, Sydney, Bowens-Rubin, Rachel, Soares-Furtado, Melinda, Morley, Caroline, Janson, Markus, Debes, John, Xu, Siyi, Kleisioti, Evangelia, Kenworthy, Matthew, Butler, Paul, Crane, Jeffrey D., Osip, Dave, Shectman, Stephen, Teske, Johanna
The MIRI Exoplanets Orbiting White dwarfs (MEOW) Survey is a cycle 2 JWST program to search for exoplanets around dozens of nearby white dwarfs via infrared excess and direct imaging. In this paper, we present the detection of mid-infrared excess at
Externí odkaz:
http://arxiv.org/abs/2408.16813
Autor:
Barrientos, Manuel, Kilic, Mukremin, Bergeron, Pierre, Blouin, Simon, Brown, Warren R., Andrews, Jeff J.
Publikováno v:
The Astrophysical Journal, Volume 973, Year 2024, Issue 2, id.88, 14 pp
We present follow-up spectroscopy and a detailed model atmosphere analysis of 29 wide double white dwarfs, including eight systems with a crystallized C/O core member. We use state-of-the-art evolutionary models to constrain the physical parameters o
Externí odkaz:
http://arxiv.org/abs/2407.18763
Autor:
Jewett, Gracyn, Kilic, Mukremin, Bergeron, Pierre, Moss, Adam, Blouin, Simon, Brown, Warren R., Kosakowski, Alekzander, Toonen, Silvia, Agüeros, Marcel A.
We present a detailed model atmosphere analysis of massive white dwarfs with $M > 0.9~M_\odot$ and $T_{\rm eff}\geq11,000$ K in the Montreal White Dwarf Database 100 pc sample and the Pan-STARRS footprint. We obtained follow-up optical spectroscopy o
Externí odkaz:
http://arxiv.org/abs/2407.04827
Autor:
Jenkins, Sydney, Vanderburg, Andrew, Bieryla, Allyson, Latham, David W., Badenas-Agusti, Mariona, Berlind, Perry, Blouin, Simon, Buchhave, Lars A., Calkins, Michael L., Esquerdo, Gilbert A., Viaña, Javier
Over a quarter of white dwarfs have photospheric metal pollution, which is evidence for recent accretion of exoplanetary material. While a wide range of mechanisms have been proposed to account for this pollution, there are currently few observationa
Externí odkaz:
http://arxiv.org/abs/2406.18638