Title of programme: Pinning down orbital period, transit ephemeris, and radius of the infant planet V1298 Tau e
Abstract: V1298 Tau is a very young (20±10 Myr) star that hosts four planets discovered by Kepler/K2. It is a unique laboratory to test planet formation and evolution theories right after system's birth. The outermost planet V1298 Tau e was observed in transit only once by K2, and a second transit was detected later on by TESS, thus orbital period and ephemeris are presently not yet constrained. This greatly affects the analysis of radial velocities and the mass determination of the planet. We are intensively studying and monitoring V1298 Tau. Since 2019 we are intensively following it up with HARPS-N and CARMENES to determine planet masses and bulk densities, with focus on planet e. So far, our published results provided preliminary estimates which need to be revised once the transit ephemeris of planet e will be accurately known. K2 and TESS observations also revealed that the transit depth is hampered by stellar activity, thus observing transits with CHEOPS will allow for a more accurate measurement, needed to pin down the bulk density of the planet. CHEOPS will provide crucial results to characterise physical and architectural properties of the whole planetary system. CHEOPS observations will complement our large dataset of radial velocities, allowing for fully exploitation. The results will be crucial to carry on a thorough study of the formation and dynamical evolution of the system at the earliest phases, and to predict the future evolution of planets' atmospheric structure.
Temporal Coverage
2023-10-14T08:03:51Z / 2023-10-16T06:10:00Z
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.
