The EBLM project-VII. Spin-orbit alignment for the circumbinary planet host EBLM J0608-59 A/TOI-1338 A
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Abstract
A dozen short-period detached binaries are known to host transiting
circumbinary planets. In all circumbinary systems so far, the planetary and
binary orbits are aligned within a couple of degrees. However, the obliquity of
the primary star, which is an important tracer of their formation, evolution,
and tidal history, has only been measured in one circumbinary system until now.
EBLM J0608-59/TOI-1338 is a low-mass eclipsing binary system with a recently
discovered circumbinary planet identified by TESS. Here, we perform
high-resolution spectroscopy during primary eclipse to measure the projected
stellar obliquity of the primary component. The obliquity is low, and thus the
primary star is aligned with the binary and planetary orbits with a projected
spin-orbit angle
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1365-2966