An international team of astronomers announced the identification of a new exoplanet, called HD 137010 b, which has striking similarities to Terra. Situado at a distance of 146 light years, the celestial body is slightly larger than our planet and orbits its star within the so-called “habitable zone”, where temperature conditions could allow liquid water to exist on its surface.
The discovery was made possible through the reanalysis of data collected by NASA’s Kepler mission, a space telescope that searched for planets outside our solar system. Utilizando advanced algorithms, scientists were able to confirm the presence of the planet, which had gone unnoticed in previous analyzes of the same data, originally collected in 2017.
With an estimated 50% probability of being habitable, HD 137010 b becomes one of the most promising candidates in the search for worlds that could harbor life. Confirmation of its atmospheric characteristics, however, will depend on future observations with more powerful instruments, such as the Telescópio Espacial James Webb.
Features of the new rocky world
The exoplanet HD 137010 b is classified as a “super-Terra”, a category of rocky planets with a mass and radius greater than Earth’s but smaller than gas giants such as Netuno. Seu radius is approximately 1.06 times that of our planet, indicating a likely rocky composition and a solid surface. Essa characteristic is fundamental for a planet to sustain an environment similar to that of Earth, with continents and oceans.
Its orbital period, that is, the time it takes to complete one revolution around its star, is 355 Earth days. Essa duration is surprisingly close to the Earth’s 365-day year, which suggests a stable orbit and a relatively constant reception of energy from its parent star, a crucial factor in maintaining a balanced climate over time.
The mother star and its influence
The planet orbits the star HD 137010, a K-type orange dwarf. Elas have a much longer lifespan of tens of billions of years, which provides more time for life to emerge and evolve.
Additionally, orange dwarfs are more stable than red dwarfs (M-type), which are more common but often emit bursts of intense radiation that could sterilize the surfaces of nearby planets. The lower temperature of the star HD 137010 means that the habitable zone is closer to it compared to our solar system, which is consistent with the 355-day orbit of the newly discovered exoplanet.
The energy received by the HD 137010 b is sufficient to maintain mild temperatures, as long as it has an atmosphere with the appropriate composition to retain heat. The absence of a thick atmosphere could result in a frozen world, while an excessively thick atmosphere could create a runaway greenhouse effect, making it too hot for life as we know it.
What does it mean to be in the habitable zone
The “habitable zone”, also known as the “Cachinhos Dourados zone”, is the orbital region around a star where temperatures are neither too hot nor too cold, allowing water to exist in a liquid state on the surface of a planet. The presence of liquid water is considered the most fundamental requirement for life. HD 137010 b’s location within this zone is the main factor that makes it a target of great interest to astrobiologists. The 50% probability reflects current uncertainties about other parameters, such as the composition and density of its atmosphere, which can only be determined with future observations. Spectroscopic analysis, for example, can reveal the presence of gases such as water vapor, oxygen, methane and carbon dioxide, which are known as potential biosignatures, that is, chemical indicators of the presence of biological processes. Confirmation of any of these gases in its atmosphere would drastically elevate its status as a potentially living world.
The technology behind confirmation
The discovery of HD 137010 b is a testament to the power of analyzing archived data. The original information was captured by Telescópio Espacial Kepler, which used the transit method to detect planets. Esse method consists of monitoring the brightness of thousands of stars simultaneously, looking for small and regular drops in luminosity that occur when a planet passes in front of its star, from our point of view.
Although the Kepler mission was completed in 2018, the vast volume of data it produced continues to be a rich source for new discoveries. Equipes of scientists around the world are constantly developing new software and algorithms to scour these archives for faint planetary signals that were initially dismissed or unidentified.
It was exactly this reanalysis process, combining computational power with new modeling techniques, that made it possible to isolate HD 137010 b’s traffic signal. Isso demonstrates that many other worlds may be hidden in the data already collected, just waiting for the right tools to be revealed.
International collaboration was essential to validate the results. Astrônomos of Austrália, Reino Unido, Estados Unidos and
Perspectives for future observations
Confirming the existence of HD 137010 b is just the first step. The next big challenge is to characterize the planet, especially its atmosphere. Next generation Instrumentos, especially the Telescópio Espacial James Webb (JWST), are essential for this task. The JWST has the sensitivity necessary to analyze the star’s light that passes through the planet’s atmosphere during a transit.
This technique, called transmission spectroscopy, allows scientists to identify the chemical elements and compounds present in the exoplanet’s atmosphere. The detection of water vapor, for example, would strengthen the hypothesis that the planet has oceans or rivers. The discovery of gases such as oxygen and methane together would be an even stronger indication of biological activity.
Comparison with Terra
Although called “Terra-like”, it is important to note the differences. Sendo a super-Earth, its surface gravity would be greater, which could have implications for geology and biology. The light from its orange dwarf star would also have a different spectrum, redder than sunlight, which could influence the type of photosynthesis that could evolve on a world like this.
Still, the combination of a size close to that of
