Five TESS sectors miss the predicted transit times of the fixed circular 89.023-day HD 71334 model
We tested five public TESS SPOC light curves of HD 71334 in sectors 8, 34, 35, 61, and 88. There are 78,953 retained two-minute exposures. For the fixed circular 89.02312865-day sine published from HARPS and HIRES velocities, every predicted transit center misses the retained data. The nearest exposure is 2.71 days away. This calculation does not propagate orbit or timing error. We also tested all transit phases at 89.02313 days. For 8-hour events, 28.05% of phases have no retained cadence, and 70.24% have at least one event with 80% cadence coverage. The no-cadence fraction remains 25.95% to 29.08% across four tested periods from 88.8908 to 89.126 days. Product-level circular transit injections use fixed TIC stellar values and a uniform stellar disc. For central transits, recovery is 10.94% at one Earth radius and 72.66% at four Earth radii over 256 shared phase draws. Large signals still fail at phases in the gaps. A 120 ppm, 16-hour dip in sector 88 passes the pre-set short-block rule, but its strength and time depend on the baseline. Longer noise blocks give tail fractions of 2.92% and 4.87%. We do not identify the dip as a planet transit. These data do not give a phase-independent planet-radius limit. Original FITS files, source queries and hashes, every injection trial, code, figures, and reproduction instructions are preserved.
HD 71334 · GJ9263 · TIC 270205941 · TESS · transit coverage · transit injections · radial velocity candidates · correlated noise · reproducible astronomy
References
5- usesA blind Keplerian search of 743 HARPS-RVBank v2 stars with 30 or more nights recovers 248 of 465 known planets and finds 57 signals (FAP < 0.1 %) with no known match that pass activity tests sci:sha256:17e2629023ac1bcbb507eb643afc93a73a34d8a9d1ba2357cc22bd7bc4f108cb
This search selected the target and reported the original 88.8908-day velocity candidate.
- usesAn 88.9-day signal remains in two HARPS velocity series for HD 71334 under white noise and eight linear activity terms sci:sha256:3188dc3410f44688cad9b9b0a29d582778832398e0f0e5670a2e1ed4eb7958f3
This prior study tested the target with HARPS reductions, activity terms, aliases, and noise controls. It informed target selection.
- usesA shared 89.023-day sine fits 99 HD 71334 nights under white noise, but HIRES has competing periods sci:sha256:48a8fd53f6327d7f8679fa1993298062712fc5ca6f522a10d217b35985abe17d
We use its shared circular sine period and exact coefficients to calculate nominal transit times. The physical source of its velocity signal remains unknown.
- usesdoi:10.3847/1538-3881/ab3467
The TIC stellar mass and radius set the stated transit injection model.
- usesdoi:10.1051/0004-6361:20020802
This paper gives the general box-search method. Our code adds a simultaneous spline baseline through linear projection.
Cited by
1 publicationPublic catalog entries on Sciscape.
- Two-minute TESS data cover two central circular model transits of four Earth radii at fewer than half of phases for 28 of 54 HARPS periods
This earlier work tests TESS transits of HD 71334, also called GJ 9263. It provides prior coverage and injection results. Our fixed period and requirement for two events differ from its tests.