Simulating the MR Relation from APF Followup of TESS Targets: Survey Design and Strategies for Overcoming Mass Biases
Abstract
We present simulations of multiyear radial velocity (RV) followup campaigns of the TESS exoplanet yield on the Automated Planet Finder telescope, using four different schemes to sample the transiting planets’ RV phase curves. For planets below roughly 10 M _{⊕}, we see a systematic bias of measured masses that are higher than the true planet mass, regardless of the observing scheme used. This produces a statistically significant difference in the massradius relation we recover, where planet masses are predicted to be too high and too similar across the entire superEarth to Neptune radius range. This bias is due in part to only reporting masses that are measured with high statistical significance. Incorporating all mass measurements, even those that are essentially only upper limits, significantly mitigates this bias. We also find statistically significant differences between the mean number of planets measured at the 1, 3, and 5σ _{K} level by the different prioritization schemes. Our results show that prioritization schemes which more evenly sample the RV phase curves produce a larger number of significant mass detections. The scheme that aims to most uniformly sample the phase curve performs best, followed closely by the scheme that randomly samples, and then an inquadrature sampling approach. The fourth scheme, out of quadrature, performs noticeably worse. These results have important implications for determining accurate planet compositions and for designing effective RV followup campaigns in the era of large planet detection surveys such as K2, TESS, and PLATO.
 Publication:

The Astronomical Journal
 Pub Date:
 December 2018
 DOI:
 10.3847/15383881/aae697
 arXiv:
 arXiv:1810.06569
 Bibcode:
 2018AJ....156..255B
 Keywords:

 planetary systems;
 techniques: radial velocities;
 Astrophysics  Earth and Planetary Astrophysics
 EPrint:
 17 pages, 13 figures