New exoplanet orbit exoplanet sub-neptune in detected orbit

Using the radial speed method, an international team of astronomers has discovered a new extrasolar planet in orbit around a neighboring star known as GI 410. The new extraterrestrial world has been classified as a sub-neptune exoplanet with a mass of at least 8.4 masses of earth. The discovery was reported on April 4 on the pre-printed server arxiv.

The radial speed (RV) method of detecting an exoplanet is based on the detection of variations in the speed of the central star, due to the changing direction of the gravitational attraction of an invisible exoplanet because it orbits the star. Thanks to this technique, more than 600 exoplanets have been detected so far.

Now, a group of astronomers led by Andres Carmona from the Grenoble Alpes University in France reports another exoplanet detection using the RV technique. The discovery was made with the near infrared spectropolarimeter near the Canada – France – Hawaii (CFHT) telescope. The observations were supplemented by data from the Sophie optical velocimeter at the Haute-Provence Observatory.

“We have watched the star in the near infrared with the spectropolarimeter and the Spirou velocimeter and in the perspective with the Sophie velocimeter. The signal is recovered in the raw data LBL (line by line) and the two PCA (main) component methods to correct the PCA (main) system methods to correct the PCA system methods and the PCA) explain.

The newly detected planet, which received the GI 410 B designation, has a minimum mass of 8.4 masses of land and orbit its host every 6.02 days, at a distance of 0.053 in. However, given that GI 410 B does not transit its parent star, its radius remains unknown.

The Host Star GI 410, which is located about 39 light years old, is about half the size and mass of the sun. The star has an effective temperature at a level of 3,842 k and its age was estimated at 480 million years, so it is one of the youngest stars nearby.

Given that GI 410 B is located very close to its host, astronomers have stressed that it can have an active interaction with high energy radiation and the stellar wind flows of GI 410. They calculated that GI 410 B can receive 20.4 times more than the sunstonement.

In addition to the detection of GL 410 B, provisional evidence of two additional planetary signals were found at 2.99 and 18.7 days. However, other observations are necessary to confirm the planetary nature of these signals.

“Other measures and improvements in data recovery methods in the region | VTOT | <10 km / s are necessary to fully exploit all the measures taken and finally confirm or refute the planetary nature of these signals," conclude the authors of the article.

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