Tanvi Sharma (PhD student, IANCU)
"WD1032 + 011, an inflated brown dwarf in an old eclipsing binary with a white dwarf
[Online via Zoom due to the current alert of covid-19]"
時間/地點： 2021-05-19 12:10 [Zoom]
摘要：
We present the discovery of only the third brown dwarf known to eclipse a nonaccreting white dwarf. Gaia parallax information and multi-colour photometry confirm that the white dwarf is cool (9950±150 K) and has a low mass (0.45±0.05 Msun ), and spectra and lightcurves suggest the brown dwarf has a mass of 0.067 ±0.006 Msun (70 MJup) and a spectral type of L5±1. The kinematics of the system show that the binary is likely to be a member of the thick disk and therefore at least 5 Gyr old. The high cadence lightcurves show that the brown dwarf is inflated, making it the first brown dwarf in an eclipsing white dwarf-brown dwarf binary to be so.
For more details, you may refer to the link:
https://arxiv.org/abs/2006.09417
or
https://ui.adsabs.harvard.edu/abs/2020MNRAS.497.3571C/abstract
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We will meet here on Zoom:
https://zoomtw.zoom.us/j/96189898452?pwd=U3E4VmdOLy9xRVhwaHFzN251T1MyQT09
ID: 961 8989 8452
Password: astro