Table 1.
Properties of the four new eclipsing ultracompact binary systems.
| Name | RA | Dec | Porb | G | BP − RP | ZTF g-r | PSg-r | Parallax | Distance |
|---|---|---|---|---|---|---|---|---|---|
| min | Vega-mag | Vega-mag | AB-mag | AB-mag | mas | pc | |||
| ZTF20aabowdt | 07h29m07.69s | −06°02′46.61″ | 25.9854(3) | 20.41 | 0.07±0.15 | −0.41±0.02 | 0.33±0.24 | 1.17±0.64 |  |
| ZTF18acgmwpt | 07h01m15.77s | +50°23′21.46″ | 32.4904(1) | 20.50 | 0.14±0.28 | −0.25±0.01 | −0.24±0.04 | 0.50±0.62 |  |
| ZTF19abugzba | 18h38m47.16s | +07°44′46.23″ | 39.6116(3) | 20.07 | 0.64±0.21 | −0.06±0.01 | 0.03±0.06 | 1.43±0.54 |  |
| ZTF21abbxnbm | 21h16m04.73s | +24°46′20.53″ | 56.1440(7) | 20.64 | 2.36±0.88 | −0.04±0.01 | −0.09±0.08 | – | – |
Notes. The Gaia magnitudes and parallaxes are taken from Gaia Collaboration (2023); Gaia Collaboration (2016). The ZTF colours were determined by measuring the robust average brightness in each band using a sigma-clipped average value. The Pan-STARRS data were taken from Chambers et al. (2016). Distances are taken from Bailer-Jones et al. (2018).
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