Bibcode
Eigmüller, P.; Csizmadia, Szilárd; Endl, Michael; Gandolfi, Davide; Cochran, William D.; Yong, David; Smith, Alexis M. S.; Cabrera, Juan; Deeg, H. J.; Johnson, Marshall C.; Korth, Judith; Nespral, D.; Prieto-Arranz, J.; Hatzes, Artie P.
Bibliographical reference
Monthly Notices of the Royal Astronomical Society, Volume 480, Issue 3, p.3864-3870
Advertised on:
11
2018
Citations
7
Refereed citations
6
Description
We report the discovery and characterization of an eclipsing M5Vdwarf
star, orbiting a slightly evolved F7V main sequence star. In contrast to
previous claims in the literature, we confirm that the system does not
belong to the galactic open cluster Ruprecht 147. We determine its
fundamental parameters combining K2 time-series data with spectroscopic
observations from the McDonald Observatory, FIES@NOT, and HIRES@KECK.
The very precise photometric data from the K2 mission allows us to
measure variations caused by the beaming effect (relativistic doppler
boosting), ellipsoidal variation, reflection, and the secondary eclipse.
We determined the radial velocity using spectroscopic observations and
compare it to the radial velocity determined from the beaming effect
observed in the photometric data. The M5V star has a radius of 0.200
^{+0.007 }_{ -0.008} R⊙ and a mass of 0.187 ^{+0.012 }_{
-0.013} M⊙. The primary star has a radius of 1.518
^{+0.038 }_{ -0.049} R⊙ and a mass of 1.008 ^{+0.081 }_{
-0.097} M⊙. The orbital period is 5.441995 ±
0.000007 d. The system is one of the few eclipsing systems with observed
beaming effect and spectroscopic radial velocity measurements and it can
be used as a test case for the modelling of the beaming effect. Current
and forthcoming space missions such as TESS and PLATO might benefit from
the analysis of the beaming effect to estimate the mass of transiting
companions without the need for radial velocity follow up observations,
provided that the systematic sources of noise affecting this method are
well understood.
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