A very short exoplanet discovered with TESS

A very short exoplanet discovered with TESS

TESS target pixel file image of HD 20329 observed in sector 42. Credit: Murgas et al, 2022

Using NASA’s Transiting Exoplanet Survey Satellite (TESS), an international team of astronomers has discovered a new, very short-period exoplanet. The newly discovered alien world, designated HD 20329 b, orbits its host star in just under one day. The result was presented on November 4 at arXiv.org.

TESS is surveying about 200,000 of the brightest stars near the sun with the goal of searching for transiting exoplanets. To date, it has identified nearly 6,000 exoplanet candidates (TESS Objects of Interest, or TOI), of which 268 have been confirmed so far.

Now, a group of astronomers led by Felipe Morgas of the University of La Laguna, Spain, recently confirmed another TOI observed by TESS. In a recently published research paper, they report that a transit signal has been identified in the light curve of solar star HD 20329 (or TOI-4524). The planetary nature of this signal was confirmed by follow-up radial velocity measurements taken with the HARPS-N spectrometer.

Here we report the discovery of HD 20329 b, a USP [ultra-short-period] A planet around a bright star (V = 8.74 mag, J = 7.5 mag), discovered using TESS data,” the study authors wrote.

HD 20329 b has a radius of 1.72 Earth radii and is about 7.42 times larger than our planet, giving an average volumetric density of about 8.06 g/cm.3. take this exoplanet It takes about 22.2 hours to completely circle its host. The results show that HD 20329 b is located only 0.018 AU from the star and its equilibrium temperature is estimated to be around 2000 K.

Therefore, HD 20329 b is the latest addition to the list of about 120 known very short-period exoplanets, joining about 30 USPs with Doppler radius and mass measurements. The authors of the paper do not rule out the possibility that there are more objects in the HD 20329 system, but more observations are needed to confirm this.

We note that after subtracting the planetary signal of the USP planet from the RV [radial velocity] By measurements, the RV remnant represents a slope that may indicate the presence of an additional low-mass object orbiting HD 20329,” the researchers wrote.

They added that an emission spectroscopy measure of HD 20329 b indicates that this planet presents favorable conditions for following secondary transits with NASA’s James Webb Space Telescope (JWST).

When it comes to file parameters host star The study revealed HD 20329 to have a radius of about 1.13 solar radii and is about 10 percent less massive than the Sun. The star is 11 billion years old, has a metallicity of -0.07, and its level effective temperature It has been measured to be 5,596 K. The distance to the system is estimated to be 207.6 K light years.

more information:
F. Murgas et al, HD 20329b: a planet with a very short period around a solar-type star found by TESS, arXiv (2022). doi: 10.48550/arxiv.2211.02547

Journal information:

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the quote: Ultra Short Period Exoplanet Discovered with TESS (2022, November 24) Retrieved November 24, 2022 from https://phys.org/news/2022-11-ultra-short-period-exoplanet-tess.html

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