Starquakes Rock Alien Sun,Revealing Details of a 'Hot Saturn'
An illustration shows the gas giant orbiting close to a star will starquakes similar to those found in our own sun.
Credit: Gabriel Perez Diaz,Instituto de Astrofísica de Canarias

A NASA space observatory called TESS has,for the first time,detected a 徳赢电子竞技planet orbiting a star with visible starquakes.

That's a big deal,both because it shows the capabilities of the newly active TESS 徳赢电子竞技planet-hunting satellite and because it allowed astronomers to precisely characterize a newfound "hot Saturn." That exoplanet revealed itself to cameras on TESS (short for Transiting Exoplanet Survey Satellite).

"This is the first bucketful of water from the fire hose of data we're getting from TESS," Steve Kawaler,a professor of astronomy at Iowa State University and co-author of a paper on the new research,said in astatement.[Gallery: Our Amazing Sun]

TESS,launchedin April 2018,is just beginning to show scientists what it can do.Like its predecessor,the Kepler space telescope,the orbiting TESS detects 徳赢电子竞技planets by watching the brightness of their host stars dip as the planets pass between the stars and the telescope.Unlike Kepler,the TESS satellite focuses on a group of bright stars relatively close to Earth and spread across a wide span of the sky.(Kepler had a more limited field of view,watching stars farther away.) TESS can also detectstarquakes— seismic waves that pass through stars much likeearthquakestravel through Earth — by watching more-rapid changes in those same stars' brightness.

Starquakes rock every star to some degree,but they're not always detectable.When astroseismologists can spot this phenomenon,though,the stellar shaking offers useful information about a star's mass,age and size.In turn,that information can help astronomers figure out details about the 徳赢电子竞技planets orbiting those stars.

In this study,TESS data revealed that host star TOI-197 is 5 billion years old and a bit bulkier than our sun — and,critically,just beginning totransition into a red giant(a late stage of a star's life).The 徳赢电子竞技planet orbiting this star,TOI-197.01,is a gas giant about the size ofSaturnbut orbiting so close to its star that its entire orbit takes just 14 days.This world is the most precisely studied Saturn-size 徳赢电子竞技planet ever (presumably except for Saturn itself),the researchers said.

TOI-197.01,orbiting so close to its star,gets cooked by the burgeoning red giant.The astronomers suggested that,as the star expands,the 徳赢电子竞技planet might puff up from the heat to an even larger size,joining a class of large,low-density gas giants orbiting red giants that Kepler discovered.

The paper describing the TOI-197 system is available on the pre-print serverarXivand will be published in a forthcoming issue of The Astronomical Journal,according to the researchers.

Originally published onvwin电子竞技.