{"id":767262,"date":"2023-09-29T17:47:51","date_gmt":"2023-09-29T21:47:51","guid":{"rendered":"http:\/\/spaceweekly.com\/?p=767262"},"modified":"2023-09-29T17:47:51","modified_gmt":"2023-09-29T21:47:51","slug":"discovery-alert-the-planet-that-shouldnt-be-there","status":"publish","type":"post","link":"https:\/\/spaceweekly.com\/?p=767262","title":{"rendered":"Discovery Alert: The Planet that Shouldn\u2019t Be There"},"content":{"rendered":"

Discovery Alert: The Planet that Shouldn\u2019t Be There<\/h2>\n
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Artist\u2019s rendering of planet 8 Ursae Minoris b \u2013 also known as \u201cHalla\u201d \u2013 amid the field of debris after a violent merger of two stars. The planet might have survived the merger, but also might be an entirely new planet formed from the debris.<\/div>\n
W. M. Keck Observatory\/Adam Makarenko<\/div>\n<\/figcaption><\/div>\n<\/div>\n<\/div>\n

By Pat Brennan <\/p>\n

NASA\u2019s Exoplanet Exploration Program<\/p>\n

The discovery:<\/strong>\u00a0A large planet is somehow orbiting a star that should have destroyed it.<\/p>\n

Key facts:<\/strong>\u00a0Planet 8 Ursae Minoris b orbits a star some 530 light-years away that is in its death throes. A swollen red giant, the star would have been expected to expand beyond the planet\u2019s orbit before receding to its present (still giant) size. In other words, the star would have engulfed and ripped apart any planets orbiting closely around it. Yet the planet remains in a stable, nearly circular orbit. The discovery of this seemingly impossible situation, relying on precise measurements using NASA\u2019s Transiting Exoplanet Survey Satellite <\/a>(TESS), shows that planet formation \u2013 and destruction \u2013 are likely far more intricate and unpredictable than many scientists might have thought.<\/p>\n

Details:<\/strong>\u00a0As stars like our Sun approach the ends of their lives, they begin to exhaust their nuclear fuel. They become red giants, expanding to their maximum size. If that happened in this case, the star would have grown outward from its center to 0.7 astronomical units \u2013 that is, about three-quarters the distance from Earth to the Sun. It would have swallowed and destroyed any nearby orbiting planets in the process. But planet b, a large gaseous world, sits at about 0.5 astronomical units, or AU. Because the planet could not have survived engulfment, Marc Hon, the lead author of a recent paper on the discovery, instead proposes two other possibilities: The planet is really the survivor of a merger between two stars, or it\u2019s a new planet \u2013 formed out of the debris left behind by that merger.<\/p>\n

The first scenario begins with two stars about the size of our Sun in close orbit around each other, the planet orbiting both. One of the stars \u201cevolves\u201d a bit faster than the other, going through its red giant phase, casting off its outer layers and turning into a white dwarf \u2013 the tiny but high-mass remnant of a star. The other just reaches the red giant stage before the two collide; what remains is the red giant we see today. This merger, however, stops the red giant from expanding further, sparing the orbiting planet from destruction. In the second scenario, the violent merger of the two stars ejects an abundance of dust and gas, which forms a disk around the remaining red giant. This \u201cprotoplanetary\u201d disk provides the raw material for a new planet to coalesce. It\u2019s a kind of late-stage second life for a planetary system \u2013 though the star still is nearing its end.<\/p>\n

Fun facts:<\/strong>\u00a0How can astronomers infer such a chaotic series of events from present-day observations? It all comes down to well understood stellar physics. Planet-hunting TESS also can be used to observe the jitters and quakes on distant stars, and these follow known patterns during the red-giant phase. (Tracking such oscillations in stars is known as \u201casteroseismology.\u201d) The pattern of oscillations on 8 Ursae Minoris, the discovery team found, match those of red giants at a late, helium-burning stage \u2013 not one that is still expanding as it burns hydrogen. So it isn\u2019t that the star is still growing and hasn\u2019t yet reached the planet. The crisis has come and gone, but the planet somehow continues to exist.<\/p>\n

The discoverers:<\/strong>\u00a0The paper describing the TESS result, \u201cA close-in giant planet escapes engulfment by its star,\u201d was published in the journal Nature in June 2023 by an international science team led by astronomer Marc Hon of the University of Hawaii.<\/p>\n


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\n Click here for original story, Discovery Alert: The Planet that Shouldn\u2019t Be There<\/a>
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\nSource: NASA Ames Research Center <\/p>\n","protected":false},"excerpt":{"rendered":"

Discovery Alert: The Planet that Shouldn\u2019t Be There Artist\u2019s rendering of planet 8 Ursae Minoris b \u2013 also known as \u201cHalla\u201d \u2013 amid the field of debris after a violent… <\/p>\n","protected":false},"author":1,"featured_media":767263,"comment_status":"false","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[26],"tags":[],"class_list":["post-767262","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ames"],"_links":{"self":[{"href":"https:\/\/spaceweekly.com\/index.php?rest_route=\/wp\/v2\/posts\/767262","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/spaceweekly.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/spaceweekly.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/spaceweekly.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/spaceweekly.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=767262"}],"version-history":[{"count":0,"href":"https:\/\/spaceweekly.com\/index.php?rest_route=\/wp\/v2\/posts\/767262\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/spaceweekly.com\/index.php?rest_route=\/wp\/v2\/media\/767263"}],"wp:attachment":[{"href":"https:\/\/spaceweekly.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=767262"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/spaceweekly.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=767262"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/spaceweekly.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=767262"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}