Science & Technology
Habitable-Zone Planet Finder
- 22 Feb 2020
- 4 min read
Why in News
The Habitable-zone Planet Finder (HPF) has confirmed its first planet (exoplanet) called G 9-40b, orbiting a nearby low mass bright M-dwarf star (100 light years from Earth) with an orbital period of 6 Earth-days.
- Earlier, NASA’s Kepler mission had observed a dip in the host star’s light, suggesting that the planet was crossing in front of the star during its orbit. To confirm the HPF was used.
Key Points
- G 9-40b: G 9-40b is amongst the top 20 closest transiting planets known.
- Habitable-zone Planet Finder : HPF is an astronomical spectrograph, built by Penn State University scientists, and recently installed on the 10m Hobby-Eberly Telescope at McDonald Observatory (US).
- The HPF searches for exoplanets by using the Doppler effect.
- A spectrograph is an instrument that splits light into its component wavelengths. Scientists measure the properties of light over a specific portion of the spectrum, and draw conclusions on what is responsible for the trends they observe.
- The HPF provides the highest precision measurements of infrared signals from nearby low-mass stars, and astronomers use it to validate the candidate planet by excluding all possibilities of contaminating signals to a very high level of probability.
- It is designed to detect and characterise planets in the habitable-zone also known as ‘Goldilocks zone’- the region around the star where a planet could sustain liquid water on its surface.
- HPF is currently surveying the nearest low-mass stars, also called M-dwarfs, which are the most common stars in the galaxy - with the goal of discovering exoplanets in our neighborhood.
Doppler Effect
- An increase (or decrease) in the frequency of sound, light, or other waves as the source and observer move towards (or away from) each other.
- The effect causes the sudden change in pitch noticeable in a passing siren, as well as the red shift seen by astronomers.
Exoplanet
- An exoplanet or extrasolar planet is a planet outside the Solar System. The first confirmation of detection of exoplanet occurred in 1992.
- Exoplanets are very hard to see directly with telescopes. They are hidden by the bright glare of the stars they orbit.
- So, astronomers use other ways to detect and study exoplanets such as looking at the effects these planets have on the stars they orbit.
M-dwarfs
- M dwarf or M-type star, also called Red Dwarf Star are the most numerous type of star in the universe and the smallest type of hydrogen-burning star.
- These have masses from about 0.08 to 0.6 times that of the Sun.
- In the Milky Way Galaxy, about 70% of the stars are red dwarfs.
