1 research outputs found
Updated Planetary Mass Constraints of the Young V1298 Tau System Using MAROON-X
The early K-type T-Tauri star, V1298 Tau (, ) hosts four transiting planets with radii ranging
from . The three inner planets have orbital periods of
while the outer planet's period is poorly constrained by
single transits observed with \emph{K2} and \emph{TESS}. Planets b, c, and d
are proto-sub-Neptunes that may be undergoing significant mass loss. Depending
on the stellar activity and planet masses, they are expected to evolve into
super-Earths/sub-Neptunes that bound the radius valley. Here we present results
of a joint transit and radial velocity (RV) modelling analysis, which includes
recently obtained \emph{TESS} photometry and MAROON-X RV measurements. Assuming
circular orbits, we obtain a low-significance () RV detection
of planet c implying a mass of and a
conservative upper limit of . For planets b and d, we
derive upper limits of and . For planet e, plausible discrete periods of are ruled out at a level while seven solutions with
are consistent with the most probable
solution within . Adopting the most
probable solution yields a RV detection with mass a of
. Comparing the updated mass and radius constraints
with planetary evolution and interior structure models shows that planets b, d,
and e are consistent with predictions for young gas-rich planets and that
planet c is consistent with having a water-rich core with a substantial
( by mass) H envelope.Comment: 18 pages, 13 figures, accepted for publication in A