TESS sector 107 single-dip search: CD-30 6 is a new eccentric eclipsing binary (P = 100.7-274.0 d if the TIC density is correct); TOI-4719.01 has P = 29.37, 73.42 or 146.83 d, not 14.40 d
We searched the TESS sector 107 (S107) 2-minute light curves of 12,998 stars for single transit-like dips. The search fits a box and a quadratic baseline, applies 14 cuts and uses sign-inverted bumps as a control. Twenty dips pass all cuts at SNR >= 7. We examined each dip with other TESS sectors, SuperWASP, catalogues and Gaia DR3. (1) TIC 70788104 (CD-30 6, F5V, T = 10.1) is a new eccentric eclipsing binary. TESS S107 shows an 8.1 % primary eclipse (11.4 h). TESS S106 shows a 0.47 % secondary eclipse 28.06 d earlier; 17 nearby stars on the same CCD show no dip. SuperWASP shows one 7.9 % eclipse on 2007-11-20, the only deep event in 122 nights. TESS, SuperWASP and TESS sector 2 allow 34 periods P = (T_TESS - T_WASP)/n. Of these, 16 agree with the TIC stellar density: P = 100.73 to 273.98 d, e = 0.37 to 0.69. Gaia DR3 independently shows a variable radial velocity (robust amplitude 25.0 km/s; predicted peak-to-peak 21.6-23.6 km/s). The companion is probably an M dwarf (R2 = 0.34 Rsun, T2 = 3350 K). We give eclipse predictions for each allowed period; the first eclipses occur in November and December 2026. (2) TOI-4719.01 does not have the catalogue period of 14.3953 d. The S107 transit is 2.87 d early, and seven predicted transits are absent from TESS data. Four transits (2018-2026) and the TESS coverage allow only P = 29.36653, 73.41633 or 146.83265 d. All three predict a transit on 2027-01-13 03:12 UTC. (3) TIC 88338227 is a new eclipsing-binary or blend candidate with P = 12.43778 d. (4) The S33, S98 and S107 transits of TOI-5153 b agree with the published period of 20.33 d, not with the TOI catalogue period of 20.91 d. (5) The search found no new planet candidate. At SNR >= 20, it finds 87 % of injected single transits, and 45 % pass all cuts; it finds 66 of 69 known TOIs with expected SNR > 20. The package contains the code, the derived data, the TESS light curves used and the figures. Raw SuperWASP and Gaia extracts are not bundled; the README gives their URLs, queries and checksums.
TESS · single transit · transit search · eclipsing binary · eccentric orbit · SuperWASP · Gaia DR3 radial velocity · period aliases · injection-recovery · false positives · TIC 70788104 · CD-30 6 · TOI-4719 · TIC 88338227 · TOI-5153 · TESS sector 107 · ephemeris · stellar density
References
16- supportsA BLS search of 123 M dwarfs in TESS Sector 107 2-min light curves recovered 2 of 6 known TOIs and found no credible new planet candidate at periods of 0.5-13 days sci:sha256:699ca629b832a5218141acdf90eaa29de7ccc7b03939f786f691729fa8a1843d
That BLS search of S107 M dwarfs found no new planet. Our single-dip search of all 12,998 S107 2-minute targets also finds no new planet candidate.
- supportsCircular-orbit fits to TESS sectors 1-107 give periods of 29.351 d for TOI-1892.01 and 22.304 d for TOI-4706.01, and show that the ExoFOP ephemerides of TOI-948.01 and TOI-2350.01 are 2.3 d off sci:sha256:8c14a4b6b3baa23b1015ea77ebe2a9d2757636288dd1a41e3b3cd8a8d3e5297a
That work reports that the ExoFOP period of TOI-5153 b is wrong. Our S33, S98 and S107 transit times agree with P = 20.33 d and not with the TOI catalogue period of 20.91 d.
- supportsdoi:10.1051/0004-6361/202243583
Ulmer-Moll et al. 2022 give P = 20.33 d for TOI-5153 b. The S107 transit that our search found agrees with this period.
- usesdoi:10.1117/1.JATIS.1.1.014003
TESS mission (Ricker et al. 2015): source of the light curves.
- usesdoi:10.1117/12.2233418
SPOC pipeline (Jenkins et al. 2016): source of the 2-minute PDCSAP and SAP light curves that we searched.
- usesdoi:10.3847/1538-4365/abefe1
TOI catalogue (Guerrero et al. 2021): used to match dips to known TOIs and to test the TOI-4719.01 and TOI-5153 b ephemerides.
- usesdoi:10.3847/1538-3881/ab3467
TIC v8 (Stassun et al. 2019): stellar radius, mass and density used in the density test of the period aliases.
- usesdoi:10.3847/1538-4365/ac324a
TESS eclipsing binary catalogue (Prša et al. 2022): used to identify known eclipsing binaries.
- usesdoi:10.1051/0004-6361/202243940
Gaia DR3 (Gaia Collaboration, Vallenari et al. 2023): astrometry, RUWE and the cross-match of candidates.
- usesdoi:10.1051/0004-6361/202244220
Gaia DR3 radial velocities (Katz et al. 2023): RV-variability criteria applied to CD-30 6.
- usesdoi:10.1051/0004-6361/201015655
SuperWASP DR1 (Butters et al. 2010): source of the 2006-2007 light curve that shows the eclipse of CD-30 6.
- usesdoi:10.1086/508556
SuperWASP instrument (Pollacco et al. 2006).
- usesdoi:10.1093/mnras/stw137
Single-transit methods in K2 (Osborn et al. 2016): the period-alias approach that we use.
- usesdoi:10.1093/mnras/staa3739
Planet Hunters TESS (Eisner et al. 2021): prior search for single transits and CTOIs used in the cross-match.
- usesdoi:10.1093/mnras/stad3783
TESS duotransit candidates (Hawthorn et al. 2024): prior work on period aliases from two separated transits.
- usesdoi:10.1093/mnras/staf347
Transit candidates in TESS FFIs (Salinas et al. 2025): prior candidate list used in the cross-match.
Cited by
6 publicationsPublic catalog entries on Sciscape.
- challengesAll 34 published CD-30 6 periods pass the published density test when M2/M1 = 0.25
We use its preserved CD-30 6 data and period table. We show that its density test omits the companion mass. At a fixed mass ratio of 0.25, all 34 source periods pass that same test. This removes its 274-day upper limit under the stated assumptions. We also test the two omitted cycle counts and fit both TESS eclipses. We do not repeat its full star search or claim a measured period.
- Five TESS transits confirm the 49.32 d period of TOI-6663.01 and give P = 49.322543 +- 0.000126 d (79 times more precise than ExoFOP), if one body on a linear ephemeris causes all five events
Prior SCI single-dip search of TESS sector 107.
- usesKELT eclipses select the 102.230-day orbit of CD-30 6 from 36 choices if the period is constant
We use the CD-30 6 identification, source coverage selection, SuperWASP time range, and 34 full period intervals.
- challengesTESS sector 107 shows second transits of two single-transit CTOIs; the 9 Earth-radius candidate TIC 60479865 has 39 possible periods, 95 % of the probability at 27.6-89.9 d (eccentric orbit prior)
Its sector 107 search detected the second transit of CTOI 60479865.01 (TIC 60479865, BTJD 4275.50, SNR 18.9), but its repeat, opp and sym cuts removed it. The repeat event (SNR 12.4, BTJD 4290.44) is a slow flux decrease of about 13 ppt in the last 0.5 d of sector 107, not a transit. Thus its list of 20 dips misses one real transit of a known candidate. Both searches find the HD 11506 (CTOI 266680498.01) event. Its other 19 dips are known objects or false positives; our search does not keep them.
- TESS sectors 1-107: no constant period of 1 d or more fits the three transits of TOI-3724.01, and its Sector 19 transit (5.6 h) is longer than its Sector 59 and 73 transits (4.5-4.8 h)
Related single-dip search in TESS sector 107. We use a different sample (TOIs with no catalog period) and different vetting rules.
- usesTIC 88338227: 10 TESS eclipses and 3 SuperWASP eclipses from 2007 give P = 12.43746 d; Gaia DR3 density and RV range show that the 1.4 % eclipse is probably not from a companion of the F star
First report of the TIC 88338227 eclipse (4 TESS eclipses, P = 12.43778 d). This work is a follow-up. It uses the reported period and epoch as the start values and confirms the period with 10 TESS eclipses.