Kavli Affiliate: Avi Shporer
| First 5 Authors: Tony Wells, Tony Wells, , ,
| Summary:
We present a joint analysis of TESS photometry and radial velocity
measurements obtained from the Minerva-Australis facility for two short-period
eclipsing binaries, TIC 48227288 and TIC 339607421. TIC 339607421 hosts an
M-dwarf companion ($M_B = 0.294 pm 0.013 : M_odot$, $R_B = 0.291 pm 0.006
: R_odot$) orbiting an F6V star ($M_A=1.09 pm 0.04 : M_odot$,
$R_A=1.21^+0.03_-0.02 : R_odot$). While TIC 48227288 contains a late K
class companion ($M_B=0.635 pm 0.037 : M_odot$, $R_B = 0.605 pm 0.011 :
R_odot$) orbiting an F3V star ($M_A = 1.36^+0.06_-0.08 : M_odot$,
$R_A = 1.61 pm 0.03 : R_odot$). Both companions follow short period,
near-circular orbits ($P_B = 2.4-3.0$ d, $e approx 0.001$). Sky-projected
obliquities for each system were derived using a classical analysis of the RV
perturbation and the Reloaded Rossiter-McLaughlin (RRM) technique. The
classical method indicates minor spin-orbit misalignment for both systems
($lambda_A = -14.7^+5.4_-5.9$ deg and $-17.8^+1.9_-2.0$ deg for TIC
339607421 and TIC 48227288, respectively). The RRM analysis yields smaller
obliquities ($lambda_A = -8.2 pm 0.2$ deg and $-9.5 pm 0.2$ deg
respectively), but confirms the minor misalignment inferred from the classical
analysis. The findings of misaligned, circular orbits are notable even though
the misalignments are not large, and suggest potential gaps in current models
of binary formation and orbital evolution. As such, further investigation of
these and similar systems appears warranted.
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