期刊
ASTRONOMICAL JOURNAL
卷 159, 期 6, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.3847/1538-3881/ab8a48
关键词
Exoplanet astronomy; Eclipsing binary stars
资金
- NASA Science Mission directorate
- Swiss National Science Foundation
- Partnership for an Advanced Computing Environment (PACE) at the Georgia Institute of Technology
- NASA Habitable Worlds grant [80NSSC17K0741]
- NASA XRP [80NSSC18K0519]
- National Science Foundation Graduate Research Fellowship Program [DGE-1746045]
- European Research Council (ERC) under the European Union [803193/BEBOP]
- Leverhulme Trust [RPG-2018-418]
- CFisUC strategic project [UID/FIS/04564/2019]
- LSSTC
- NSF [1829740]
- Brinson Foundation
- Moore Foundation
- GSFC Sellers Exoplanet Environments Collaboration (SEEC)
- NASA Planetary Science Divisions Internal Scientist Funding Model
- [1101.C-0721]
- STFC [ST/N003179/1] Funding Source: UKRI
We report the detection of the first circumbinary planet (CBP) found by Transiting Exoplanet Survey Satellite (TESS). The target, a known eclipsing binary, was observed in sectors 1 through 12 at 30 minute cadence and in sectors 4 through 12 at 2 minute cadence. It consists of two stars with masses of 1.1 M and 0.3 M on a slightly eccentric (0.16), 14.6 day orbit, producing prominent primary eclipses and shallow secondary eclipses. The planet has a radius of similar to 6.9 R-circle plus and was observed to make three transits across the primary star of roughly equal depths (similar to 0.2%) but different durations-a common signature of transiting CBPs. Its orbit is nearly circular (e 0.09) with an orbital period of 95.2 days. The orbital planes of the binary and the planet are aligned to within similar to 1 degrees. To obtain a complete solution for the system, we combined the TESS photometry with existing ground-based radial-velocity observations in a numerical photometric-dynamical model. The system demonstrates the discovery potential of TESS for CBPs and provides further understanding of the formation and evolution of planets orbiting close binary stars.
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