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| ZTFJ0522: A new compact hot HW Vir binary with a potential substellar companion found in the EREBOS data |
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HW Vir systems are binary stars with orbital periods below a few hours, consisting of a hot subdwarf primary and a low-mass stellar or substellar companion. The EREBOS project aims to systematically study the population of HW VIr binaries. ZTFJ0522 was discovered as one of the most compact HW Vir binaries with a period of only 89 minutes as part of the EREBOS project. We obtained follow-up spectroscopy to study the object in more detail. In this poster we will present preliminary results from our analysis. We find a very hot sdO primary with a temperature of ~50,000K making it one of the hottest known hot subdwarfs discovered in an HW Vir. From the velocity semi-amplitude and the assumption of 0.5 Msun sdO star we can estimate a companion mass and find a mass of ~50 Jupiter masses which makes the system a candidate HW Vir hosting a substellar companion. The compact orbit combined with the high primary effective temperature makes ZTFJ0522 a prime target to search for reflection signatures of the cool companion in infrared spectra. |
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5 |
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| Duration: |
00' |
| Contribution type: |
Poster |
| Primary Authors: |
CANO, Juan (Texas Tech University) |
| Presenters: |
CANO, Juan |
| Material: |
 Poster |
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