Y Sextantis

Y Sextantis (abbreviated as Y Sex) is a W Ursae Majoris variable eclipsing contact binary star system located roughly at 360 light years from the Sun, whose two component stars share a common outer layer. Because the two components share their outer layers as the components of W Ursae Majoris do, they have the same stellar classification, and are classified as yellow F-type main sequence dwarfs. The components take 0.419822800 days (roughly 10 hours) to revolve around common barycentre. Orbital period variations would suggest the presence of additional perturbing objects, one of them likely substellar.

Y Sextantis

Possible architecture for Y Sextantis' multiple system
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Sextans
Right ascension  10h 02m 47.9589s
Declination +01° 05′ 40.346″
Apparent magnitude (V) 9.97
Characteristics
Spectral type F8V/F8.5V-VI
Astrometry
Distance361.4 ly
(110.86 pc)
Details
Mass1.21/0.22[1] M☉
Radius1.4/0.85 R☉
Luminosity2.6/0.96 L☉
Temperature≈6200 K
Other designations
Y Sex, BD+01° 2394, HIP 49217, HD 87079
Database references
SIMBADdata

Perturbing third (and fourth?) body

Orbital period variations suggest the presence of one more perturbing unseen object.[1] The authors He & Qian have estimated two possible orbital periods and minimum masses for unseen companions: the former cyclic oscillation would occur every 51.22 years (with amplitude of 0.0218 days) being caused by a low-mass stellar companion (likely a M dwarf star), whereas the latter would consist in a 32.1 years period and the unseen object could likely be substellar.

The Y Sextantis planetary system
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
C (unconfirmed) ≥240 (0.24 Solar masses) MJ 49.0±3.9 ≈18695 ? — —
b (unconfirmed) ≥43 MJ 58.9±6.7 ≈11716 ? — —
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References
  1. He & Qian (2007). "An Orbital Period Investigation of the WUMa-Type Binary Y Sextantis". Publications of the Astronomical Society of Japan. 59 (6): 1115–1119. arXiv:0908.4521. Bibcode:2007PASJ...59.1115H. doi:10.1093/pasj/59.6.1115.
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