Astronomers using data from NASA’s Transiting Exoplanet Survey Satellite (TESS) have discovered a hot-Jupiter exoplanet orbiting the early F-type star HD 2685.
An artist’s impression of the hot-Jupiter HD 2685b. Image credit: Sci-News.com.
Designated HD 2685b, the newly-discovered exoplanet is around 646 light-years away from Earth.
The alien world is approximately 1.44 times bigger than Jupiter and 1.2 times more massive.
It orbits its host star, HD 2685, once every 4.13 days at a distance of only 0.06 AU (astronomical units).
“This system is a typical example of an inflated transiting hot-Jupiter in a circular orbit,” said ESO astronomer Matias Jones and co-authors.
This image shows the early F-type star HD 2685 (center). Image credit: Centre de Données astronomiques de Strasbourg / SIMBAD / 2MASS.
Also known as TIC 267263253 and TOI 135, the parent star is 1.3 billion years old and is relatively hot (about 11,800 degrees Fahrenheit, or 6,530 degrees Celsius).
Dr. Jones and colleagues estimate the exoplanet’s temperature to be about 3,300 degrees Fahrenheit (1,800 degrees Celsius).
“Given the host star apparent visual magnitude (V=9.6 mag), this is one of the brightest known stars hosting a transiting hot-Jupiter, and a good example of the upcoming systems that will be detected by TESS during the two-year primary mission,” they said.
“This is also an excellent target for future ground and space based atmospheric characterization.”
A paper reporting the discovery will be published in the journal Astronomy and Astrophysics.
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M.I. Jones et al. 2018. HD2685 b: A Hot-Jupiter orbiting an early F-type star detected by TESS. A&A, in press; arXiv: 1811.05518
