NASA’s planet-hunting satellite tv for pc TESS, or Transiting Exoplanet Survey Satellite, has made another intriguing discovery. This time, it’s situated a planet someplace the place it shouldn’t be, proper in the course of a zone through which any planet ought to have been annihilated by its star.
The star HD 203949 is situated 257 light-years away and is a K2-type large star, barely cooler than our solar. Traveling round this star is a giant planet, HD 203949b, which is eight.2 occasions the mass of Jupiter and in a 184-day round orbit.
So far, so typical. But there’s one thing odd about HD 203949b as a result of it ought to have been engulfed by its star way back. The boundaries of a star, known as its envelope, increase and contract over time. When the enormous star HD 203949 was youthful in its pink large part, its envelope ought to have coated the planet and destroyed it — and but the planet remains to be there.
The researchers investigated this thriller extra intently utilizing laptop simulations. They got here up with a idea that the planet will need to have began out additional away from the star and been drawn nearer towards it over time.
“We determined how this planet could have reached its current location, and to do so whether or not the planet had to survive engulfment within the stellar envelope of the red giant star,” co-author Dr. Dimitri Veras defined in a statement. “The work sheds new light on the survivability of planets when their parent stars begin to die, and might even reveal new aspects of tidal physics.”
This discovery of a planet shifting its orbit over time reveals how complicated the relationships inside planetary techniques will be. “This study is a perfect demonstration of how stellar and exoplanetary astrophysics are linked together,” co-author Dr. Vardan Adibekyan stated in the identical assertion. “Stellar analysis seems to suggest that HD 203949 is too evolved to still host a planet at such a short orbital distance, while from the exoplanet analysis we know that the planet is there.”
“The solution to this scientific dilemma is hidden in the simple fact that stars and their planets not only form but also evolve together,” Dr. Adibekyan continued. “In this particular case, the planet managed to avoid engulfment.”
The findings are printed within the Astrophysical Journal.