S-BGLS periodograms of YV2 for the star HD48948 focusing on three frequency intervals (7.3, 38 and 151 d). The absolute value of log P has no meaning; instead, the relative values of logP matter. The signal observed at about 42 d in the middle panel represents the transient activity feature. Credit: Monthly Notices of the Royal Astronomical Society (2024). DOI: 10.1093/mnras/stae1367
Astronomers have discovered three potential “super-Earth” exoplanets orbiting a relatively nearby orange dwarf star. This groundbreaking discovery was made by an international team of researchers led by Dr. Shweta Dalal from the University of Exeter.
The exoplanets are orbiting Star HD 48498, located approximately 55 light years from Earth. These planets orbit their host star in 7, 38, and 151 Earth days, respectively. Notably, the outermost exoplanet candidate resides in the habitable zone of its host star, where conditions may allow liquid water to exist without boiling or freezing. This region, often referred to as the Goldilocks zone, is considered ideal for potentially supporting life.
The researchers emphasize the importance of this discovery, noting that this orange star is somewhat similar to our sun and represents the closest planetary system to host a Super-Earth in the habitable zone around a sun-like star.
The study detailing these findings was published in the journal MNRAS on June 24, 2024.
The histogram shows the number of observations per semester from October 2013 to April 2023. Each bar shows the number of observations taken in each semester over the 10-year period. Credit: Monthly Notices of the Royal Astronomical Society (2024). DOI: 10.1093/mnras/stae1367
Dr. Dalal said, “The discovery of this Super-Earth in the habitable zone around an orange star is an exciting step forward in our quest to find habitable planets around solar-type stars.”
These possible Super-Earths, planets more massive than Earth but significantly smaller than the solar system’s ice giants Uranus and Neptune, were identified through the HARPS-N Rocky Planet Search program. Over a decade, the team collected nearly 190 high-precision radial velocity measurements using the HARPS-N spectrograph.
Radial velocity measurements, which track subtle motions of the star caused by orbiting planets, are crucial in such discoveries. By analyzing the spectrum of light from the star, researchers can determine whether it is moving toward us (blueshift) or away from us (redshift). To ensure the accuracy of their findings, the team used different methodologies and comparative analyses.
The research revealed three planetary candidates with minimum masses ranging from 5 to 11 times that of Earth. The team suggests that the proximity of the star, combined with the favorable orbit of the outermost planet, makes this system a promising target for future direct high-contrast imaging and high-resolution spectroscopic studies.
Dr Dalal added, “This discovery highlights the importance of long-term monitoring and advanced techniques in unlocking the secrets of distant star systems. We are eager to continue our observations and search for additional planets in the system.”
This discovery opens new doors to understanding planetary systems and the potential for life beyond our solar system.
More information:
S Dalal et al, A trio of super-Earth candidates orbiting the K-dwarf HD 48948: a new candidate for the habitable zone, Monthly Notices of the Royal Astronomical Society (2024). DOI: 10.1093/mnras/stae1367
Provided by the University of Exeter
citation: Astronomers find three potential super-Earths around nearby star (2024, June 24) Retrieved June 24, 2024 from https://phys.org/news/2024-06-astronomers-potential-super-earths-nearby.html
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