Home Science An ultra-short-period exoplanet discovered with TESS

An ultra-short-period exoplanet discovered with TESS

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

Using NASA’s Transiting Exoplanet Survey Satellite (TESS), an international team of astronomers has detected a new ultrashort period exoplanet. A newly discovered alien world, designated HD 20329 b, orbits its star in less than a day. The findings were published on arXiv.org on November 4th.

TESS is surveying about 200,000 of the brightest stars close to the Sun to look for exoplanet transits. So far, we have identified about 6,000 candidate exoplanets (TESS Objects of Interest, or TOIs), of which 268 have been confirmed so far.

A group of astronomers, now led by Felipe Murgas at the University of La Laguna in Spain, recently confirmed another TOI monitored by TESS. In a recently published research paper, they report identifying a transit signal in the light curve of the sun-like 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 spectrograph.

“Here we report our discovery of USP HD 20329 b. [ultra-short-period] It is a bright (V = 8.74 mag, J = 7.5 mag) planet around a G-type star and was discovered using TESS data,” the researchers wrote in their study.

HD 20329 b has a radius of 1.72 times that of the Earth and a mass of about 7.42 times that of the Earth, giving an average bulk density of about 8.06 g/cm.3This takes exoplanet It takes about 22.2 hours to fully orbit the host. As a result, HD 20329 b is located just 0.018 AU from the star and its equilibrium temperature is estimated to be at her 2,000 K level.

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

“After subtracting the planetary signal of the USP planet from the RV, [radial velocity] Measurements show that the RV residual shows a slope that may indicate the presence of additional low-mass objects orbiting HD 20329,” the researchers wrote.

They added that HD 20329 b’s optical emission spectrometric metrics indicate that the planet presents suitable conditions for a secondary transit follow-up by NASA’s James Webb Space Telescope (JWST).

As for the parameters of host star The study revealed that HD 20329 has a radius about 1.13 times that of the Sun and has about 10% less mass than the Sun. The age of this star is her 11 billion years old, the metal content is at the level of -0.07, effective temperature It was measured at 5,596 K. The distance to the system is estimated to be approximately 207.6. light years.

For more information:
F. Murgas et al, HD 20329b: Very short period planets around solar-type stars discovered by TESS, arXiv (2022). DOI: 10.48550/arxiv.2211.02547

Journal information:
arXiv


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Quote: An ultra-short period exoplanet discovered by TESS (November 24, 2022) will be released on November 24, 2022 at https://phys.org/news/2022-11-ultra-short-period-exoplanet Taken from -tess.html.

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