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EVR-CB-001: An evolving, progenitor, white dwarf compact binary discovered with the Evryscope | | Jeffrey K. Ratzloff
; Brad N. Barlow
; Thomas Kupfer
; Kyle A. Corcoran
; Stephan Geier Evan Bauer
; Henry T. Corbett
; Ward S. Howard
; Amy Glazier
; Nicholas M. Law
; | | Date: |
4 Sep 2019 | | Abstract: | We present EVR-CB-001, the discovery of a compact binary with an extremely
low mass ($.21 pm 0.05 M_{odot}$) helium core white dwarf progenitor (pre-He
WD) and an unseen low mass ($.32 pm 0.06 M_{odot}$) helium white dwarf (He
WD) companion. He WDs are thought to evolve from the remnant helium-rich core
of a main-sequence star stripped during the giant phase by a close companion.
Low mass He WDs are exotic objects (only about .2$\%$ of WDs are thought to be
less than .3 $M_{odot}$), and are expected to be found in compact binaries.
Pre-He WDs are even rarer, and occupy the intermediate phase after the core is
stripped, but before the star becomes a fully degenerate WD and with a larger
radius ($approx .2 R_{odot}$) than a typical WD. The primary component of
EVR-CB-001 (the pre-He WD) was originally thought to be a hot subdwarf (sdB)
star from its blue color and under-luminous magnitude, characteristic of sdBs.
The mass, temperature ($T_{
m eff}=18,500 pm 500 K$), and surface gravity
($log(g)=4.96 pm 0.04$) solutions from this work are lower than values for
typical hot subdwarfs. The primary is likely to be a post-RGB, pre-He WD
contracting into a He WD, and at a stage that places it nearest to sdBs on
color-magnitude and $T_{
m eff}$-$log(g)$ diagrams. EVR-CB-001 is expected to
evolve into a fully double degenerate, compact system that should spin down and
potentially evolve into a single hot subdwarf star. Single hot subdwarfs are
observed, but progenitor systems have been elusive. | | Source: | arXiv, 1909.2012 | | Services: | Forum | Review | PDF | Favorites | |
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