van Roestel, Jan and Kupfer, Thomas and Bell, Keaton J. and Burdge, Kevin and Mróz, Przemek and Prince, Thomas A. and Bellm, Eric C. and Drake, Andrew and Dekany, Richard and Mahabal, Ashish A. and Porter, Michael and Riddle, Reed and Shin, Kyung Min and Shupe, David L. and Kulkarni, S. R. (2021) ZTFJ0038+2030: A Long-period Eclipsing White Dwarf and a Substellar Companion. The Astrophysical Journal Letters, 919 (2). L26. ISSN 2041-8205
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Abstract
In a search for eclipsing white dwarfs using the Zwicky Transient Facility lightcurves, we identified a deep eclipsing white dwarf with an orbital period of 10.4 hr and an undetected substellar companion. We obtained high-speed photometry and radial velocity measurements to characterize the system. The white dwarf has a mass of 0.50 ± 0.02 M☉ and a temperature of 10,900 ± 200 K. The companion has a mass of 0.059 ± 0.004 M☉ and is a brown dwarf. It has a radius of 0.0783 ± 0.0013 R☉, and is one of the physically smallest transiting brown dwarfs known and likely old, ≳8 Gyr. The ZTF discovery efficiency of substellar objects transiting white dwarfs is limited by the number of epochs and as ZTF continues to collect data we expect to find more of these systems.
| Item Type: | Article |
|---|---|
| Subjects: | Universal Eprints > Physics and Astronomy |
| Depositing User: | Managing Editor |
| Date Deposited: | 06 May 2023 06:26 |
| Last Modified: | 19 Jan 2024 10:55 |
| URI: | http://journal.article2publish.com/id/eprint/1860 |
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