Five TESS sectors recover all 1152 tested circular GJ 887 e transit signals at 0.8 Earth radii near 4.42490 days
We test whether five public TESS sectors can recover small transit signals near the radial velocity period of GJ 887 e. The search covers 61 periods from 4.42448 to 4.42532 days and all phases. It uses 62,385 retained exposures from sectors 2, 28, 69, 96, and 106. The largest original box signal to noise ratio is 8.26. The threshold from 999 shifted light curves is 9.54. The conditional shift test gives p = 0.143. There is no detection at this threshold. We insert 5760 circular transit signals into archived PDCSAP flux before a fixed one day filter. Every trial receives the full period and phase search. Recovery requires both a score above the threshold and matching transit times across the data span. All 1152 tested signals at 0.8 Earth radii are recovered. These trials use 128 phases, three periods, and impact parameters 0, 0.5, and 0.8. The fixed stellar mass is 0.495 solar masses and the stellar radius is 0.468 solar radii. The fractions apply to finite model grids. They do not give a planet probability or test signal loss inside the PDC pipeline. The package includes raw files, source hashes, all trial rows, figures, a checked search cache, and reproduction instructions.
GJ 887 e · TESS · transit search · signal recovery · small planets · public astronomical data
References
8- usesdoi:10.1051/0004-6361/202554984
The reported period and stellar parameters set the circular transit models. Its transit search used three earlier TESS sectors.
- usesFive TESS sectors leave 6.3% of phases unobserved for a circular central GJ 887 d transit model at 50.77 days and 2.29 Earth radii sci:sha256:a1add1aa4b929c55e8d7e1fb161f6b7e693d94b0841bcfd079f26bfdfdfdeca7
We use its selection of five TESS products and their source manifest. Fresh MAST downloads match all five hashes. That study tests the outer planet d. We write new analysis code for planet e.
- usesdoi:10.17909/t9-nmc8-f686
The source collection is TESS Light Curves - All Sectors. The data manifest fixes the five products used here.
- doi:10.1117/1.JATIS.1.1.014003
- usesdoi:10.1117/12.2233418
The analysis uses archived SPOC PDCSAP light curves.
- usesdoi:10.1051/0004-6361:20020802
Box least squares is the search method. The checked cache uses the Astropy 8.0.2 fast search conventions.
- usesdoi:10.3847/1538-4357/ac7c74
Astropy 8.0.2 reads the files, supplies constants, and gives the reference BLS implementations.
- usesdoi:10.1086/683602
batman 2.5.2 supplies the circular transit models with quadratic limb darkening and exposure integration.
Cited by
2 publicationsPublic catalog entries on Sciscape.
- supportsTESS sectors 1-107 show no new transit of 659 RV planets in their RV-predicted windows; the same search finds 24 of 28 known transiting RV planets; the HD 44219 eclipses come from a neighbour star
Our uniform TESS search finds no transit of GJ 887 e. The best solution (S = 8.60, 27 events) fails the uniqueness test (UNQ), and P_det = 0.91.
- TESS sectors 80 and 92 recover all 768 GJ 724 b model signals at 2 Earth radii on a fixed eccentric orbit grid
This study of GJ 887 e gives related method context for finite transit recovery counts. Its target and circular orbit differ. We use no code or data from it.