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Oxford University Press, Monthly Notices of the Royal Astronomical Society, 1(516), p. 1183-1192, 2022

DOI: 10.1093/mnras/stac2197

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Characterization of the eclipsing post-common-envelope binary TIC 60040774

Journal article published in 2022 by R. Priyatikanto ORCID, C. Knigge, S. Scaringi ORCID, J. Brink ORCID, D. A. H. Buckley ORCID
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Data provided by SHERPA/RoMEO

Abstract

ABSTRACT Binaries with a white dwarf primary and a main sequence secondary can be used to test our understanding of both single and binary star evolution. A small fraction of such systems experienced a common-envelope phase from which they emerged with a relatively short orbital period. Here, we present the characterization of an eclipsing post-common-envelope binary of this kind, TIC 60040774, based on the light curve provided by the Transiting Exoplanet Survey Satellite (TESS), multiband photometry collated from the virtual observatory, and spectroscopic data obtained the Southern African Large Telescope (SALT). With an orbital period of 0.404807 ± 0.000149 d this system consists of a young white dwarf paired with an M6.5 dwarf companion. We estimate the masses of the primary and secondary to be 0.598 ± 0.029 M⊙ and 0.107 ± 0.020 M⊙, while the effective temperatures are 14050 ± 360 K and 2759 ± 50 K, respectively. The eclipse ingress and egress profile is shallower than expected from a simple geometric model such that more precise high-cadence photometry is required to understand the nature of this system. Given the similarity of TIC 60040774 to systems like GK Vir and NN Ser, it will be worth tracking its eclipse times to check for the presence of one or more circumbinary planets.