Title of programme: Determining the internal structure of the young hierarchical triple HD 144548
Abstract: HD 144548 is a young (8-11 Myr) triply eclipsing triple star in the Upper Scorpius OB association that displays complex eclipses from simultaneous occultations of all components (syzygys). This system is unique for the availability of both precise Kepler/K2 eclipse light curves from and radial velocities of all three components. In Alonso et al. (2015) we derived the components’ physical and orbital parameters with high precision, indicating significantly inflated stellar sizes, albeit the size of the system’s largest component is in tension with established models of young stars. With CHEOPS we intend to reobserve several eclipses towards an actualized determination of the systems parameters. Particularly, this should lead to a much improved determination of the system’s osculating orbital parameters, due to a coverage that would span 9 years versus the 79 days from K2. Such improved osculating parameters should permit a derivation of the internal mass-distribution of the system’s inner binary through determination of the apsidal constant k_2. Reducing uncertainties on the orbital parameters found by Alonso et al. will also significantly improve the precision of the system’s physical parameters, and permit a calibration of pre-main sequence star parameters and of the evolution of their stellar interiors. CHEOPS is uniquely suited to perform the observations of the long complex eclipses, with a required (and expected) precision that should rival the original Kepler/K2 data.
Temporal Coverage
2023-06-11T16:29:55Z / 2023-06-12T15:33:00Z
Version
3.0
Mission Description
CHEOPS (Benz et al., https://doi.org/10.1007/s10686-020-09679-4) is a European Space Agency (ESA) mission in partnership with Switzerland with important contributions to the payload and the ground segment from Austria, Belgium, France, Germany, Hungary, Italy, Portugal, Spain, Sweden and the United Kingdom.
The satellite has a single payload comprising an ultra-high precision photometer covering the 330 - 1100 nm wavelength range in a single photometric band. Observations are made as part of the Guaranteed Time Observing Programme that is formulated by the CHEOPS Science Team, and the Guest Observers Programme through which the Community at large can apply for CHEOPS time.
