An ultra-short-period exoplanet found with TESS

An ultra-short-period exoplanet discovered with TESS

TESS goal pixel file picture of HD 20329 noticed in sector 42. Credit: Murgas et al, 2022

Using NASA’s Transiting Exoplanet Survey Satellite (TESS), a global crew of astronomers has detected a brand new ultra-short-period exoplanet. The newfound alien world, designated HD 20329 b, orbits its host star in barely lower than one day. The discovering was offered November 4 on

TESS is conducting a survey of about 200,000 of the brightest stars close to the sun with the goal of looking for transiting exoplanets. So far, it has recognized practically 6,000 candidate exoplanets (TESS Objects of Interest, or TOI), of which 268 have been confirmed thus far.

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Now, a bunch of astronomers led by Felipe Murgas of the University of La Laguna, Spain, has just lately confirmed one other TOI monitored by TESS. In a just lately printed analysis paper, they report {that a} transit sign has been recognized within the gentle curve of the solar-type star HD 20329 (or TOI-4524). The planetary nature of this sign was confirmed by follow-up radial velocity measurements taken with the HARPS-N spectrograph.

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

HD 20329 b has a radius of 1.72 Earth radii and is about 7.42 instances extra huge than our planet, which provides a imply bulk density of roughly 8.06 g/cm3. It takes this exoplanet about 22.2 hours to totally orbit its host. The outcomes present that HD 20329 b is positioned simply 0.018 AU from the star and its equilibrium temperature is estimated to be at a stage of two,000 Okay.

Therefore, HD 20329 b is the newest addition to the checklist of about 120 recognized ultra-short-period exoplanets, becoming a member of about 30 USPs with radius and Doppler mass measurements. The authors of the paper don’t exclude the chance that there are extra objects within the HD 20329 system, however additional observations are required so as to affirm this.

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

They added that the emission spectroscopy metric for HD 20329 b signifies that this planet presents favorable situations for secondary transit follow-up with NASA’s James Webb Space Telescope (JWST).

When it involves the parameters of the host star HD 20329, the examine revealed that it has a radius of about 1.13 solar radii and is a few 10 % much less huge than the sun. The star is 11 billion years outdated, has a metallicity at a stage of -0.07, and its effective temperature was measured to be 5,596 Okay. The distance to the system is estimated to be roughly 207.6 light years.

More info:
F. Murgas et al, HD 20329b: An ultra-short-period planet round a solar-type star discovered by TESS, arXiv (2022). DOI: 10.48550/arxiv.2211.02547

Journal info:

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An ultra-short-period exoplanet found with TESS (2022, November 24)
retrieved 24 November 2022

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