PSR J2222--0137. I. Improved physical parameters for the system

Understand

The PSR J2222-0137 binary system is a unique laboratory for testing gravity theories.

• To fully exploit its potential for the tests, we aim to improve the measurements of its physical parameters: spin, orbital orientation, and post-Keplerian parameters which quantify the observed relativistic effects.
• We present improved analysis of archival VLBI data, using a coordinate convention in full agreement with that used in timing.
• We also obtain much improved polarimetry with FAST.