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astro-ph.EP · Earth and Planetary Astrophysicsastro-ph.IM · Instrumentation and Methods for Astrophysicsastro-ph.SR · Solar and Stellar Astrophysics

Five TESS sectors recover 495 of 500 circular test transits of 1.25 Earth radii near 19.68 days in HD 111232 with a fixed star model and impact parameters 0–0.8

We test selected public TESS light curves of HD 111232 near an unconfirmed 19.68-day radial-velocity period. Five SPOC or TESS-SPOC sectors give 17,219 ten-minute bins. We search 19.6661–19.6921 days, all phases at finite resolution, and box durations of 1.5–8 hours. No observed peak passes the empirical noise threshold: the largest score is 6.542 and the threshold is 9.727. We add physical transit models to the archived PDC flux before our running-mean filter. The main model uses a circular orbit, stellar radius 0.923819 solar radii, mass 0.96 solar masses, and quadratic limb darkening (0.4,0.2). At each radius, 500 random draws have uniform phase, period across the search range, and impact parameter 0–0.8. We recover 288/500 trials at one Earth radius, 495/500 at 1.25 Earth radii, and 500/500 at 1.5 Earth radii. The 95% Monte Carlo interval at 1.25 Earth radii is 97.68–99.67%, conditional on the observed noise and model. Changing only the stellar radius to 1.0338088 solar radii lowers recovery there to 465/500. We also test other filters, two eccentric geometries, and uniform stellar brightness. All 200 native-cadence checks give the same full recovery decision as the ten-minute approximation. This work extends an earlier fixed-period test of larger central transits. Injections occur after archive pipeline correction, so they cannot measure signal loss in that step. These are conditional recovery results. They do not establish a planet or a universal radius limit. The package includes code, original FITS data, provenance, all trial results, figures, and offline reproduction steps.

HD 111232 · TIC 329649885 · TESS · transit recovery · planet candidate · injection tests · stellar radius · box least squares · public data · reproducible research

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References

12
  1. 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

    Its HD111232_3 candidate row supplies the period, period error, target identifier, and velocity context.

  2. usesIndependent RVs reject 13 of 25 testable HARPS-RVBank v2 candidates (3 if HARPS errors double) and agree with a 19.7-day HD 111232 signal, with linear-trend nuisance models sci:sha256:1b429149b29b478f8b85a22182153f1e36c4ea06d284bbeb276a362b6f2254b1

    Its later velocity test gives context for the unconfirmed signal. Its HARPS refit eccentricity, rounded to 0.2245, sets two orbit controls.

  3. usesTwo-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 sci:sha256:7db5d6f999e83b0ca390516574cc9f792d7a00f6585573f761ff05ee7072591d

    This prior survey recovered all 128 central circular transits at two and four Earth radii for HD 111232. We preserve its result row and extend the scope to smaller radii, varying paths, a period interval, and an added sector. We do not claim the first transit test.

  4. A persistent periodic process matches the HD 111232 signal in 32 later velocities at a fixed 19.68-day period sci:sha256:64f2e5aeba91f9454798375e136a87b8f46f34997f88b30b275bb920162d0515

    Its persistent-process result shows why agreement between velocity curves does not by itself identify a planetary cause.

  5. usesdoi:10.17909/t9-nmc8-f686

    MAST TESS light-curve collection. We use the original SPOC FITS files for sectors 11, 38, 64, and 100.

  6. usesdoi:10.17909/t9-wpz1-8s54

    TESS-SPOC data collection. We use its original sector 65 light curve.

  7. usesdoi:10.3847/2515-5172/abc9b3

    Caldwell et al. describe the TESS-SPOC products used here.

  8. usesdoi:10.3847/1538-3881/ab3467

    The TESS Input Catalog supplies the adopted star radius, radius error, and mass.

  9. usesdoi:10.1086/683602

    We use batman to calculate integrated transit models with quadratic limb darkening.

  10. usesdoi:10.1051/0004-6361:20020802

    Box least squares is the search method, through the Astropy implementation.

  11. usesdoi:10.1117/12.2233418

    Description of the SPOC pipeline that produced the mission light curves.

  12. doi:10.1117/1.JATIS.1.1.014003

    Description of the TESS mission.

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