Average Weight Of The Most Common Star In The Universe The Kepler Space Telescope’s Supernova Surprise

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The Kepler Space Telescope’s Supernova Surprise

Supernovae dia fipoahana kintana izay manambara ny fahafatesan’ny kintana, ary mety hamirapiratra be izy ireo ka mety hampitony vetivety ny vahindanitra misy azy. Kilasy manokana amin’ny supernovae, antsoina hoe Type Iadia hita fa fitaovana manan-danja amin’ny fahitana lehibe ny angovo maizina–hery mifono mistery izay mahatonga an’izao rehetra izao hanafaingana amin’ny fanitarana azy, ary mandrafitra ny anjara liona amin’ny singa angovo faobe ao amin’ny Cosmos. Na izany aza, ny dingana izay miteraka Type Ia Ny fandoroana supernovae dia mijanona ho piozila amin’ny ampahany Cosmic. Na izany aza, nanambara ny astronoma tamin’ny fivoriana ririnina tamin’ny Janoary 2014 nataon’ny American Astronomical Society (AAS), natao tany ivelan’i Washington DC tao amin’ny National Harbor, Maryland, fa ny NASA dia tsy nahomby, saingy nahomby tokoa, fihazana planeta. Kepler Space Telescope dia nahomby tamin’ny fahitana mahagaga roa Type Ia fipoahana supernova, izay manazava ny fiaviany mistery.

ny Kepler Ny iraka no teleskaopy voalohany natomboka izay afaka nahita ny exoplanets mitovy habe amin’ny tany ao amin’ny manodidina antsika Galactic izay hita ao amin’ny kintan’izy ireo. faritra azo onenana. Maherin’ny 75% amin’ireo kandida exoplanet 3,500 no hitan’ny Kepler ny haben’ny fanatanjahantena manomboka amin’ny an’ny tany ka hatramin’ny an’ny Neptune.

ny faritra azo onenana manodidina ny kintana iray dia ilay faritra Goldilocks “marina” izay ahafahan’ny rano, ao anatin’ny toetry ny ranon-javatra mahavelona azy, eo amin’ny tontolo iray mihodikodina. Any amin’izay misy rano mikoriana dia mety hivoatra koa ny fiainana araka ny fantatsika! Tsy midika akory izany fa tena misy tokoa ny fiainana ao amin’ny tontolo feno rano mahafaly toy izany – fa midika izany fa misy ny mety hitranga.

Keplernatomboka tamin’ny 7 martsa 2009, avy any Cape Canaveral, Florida, dia nanana, ho iraka voalohany, ny asa nibanjina kintana maherin’ny 100.000, nihaza kely ny famirapiratany nateraky ny mandalo planeta. Keplersambon-danitra manana tanjona manokana, dia natao handrefesana tsara ireo fiovana bitika amin’ny hazavan’ireo kintana lavitra ireo, mba hitadiavana planeta vahiny izay mahatonga filentika an-kolaka ao anatin’ny hazavana mamirapiratra sy mirehitra.

Nandritra ny efa-taona nanaovany ny asany, Kepler nibanjina tsy an-kijanona teo amin’ny tampony tokana, nanangona fandrefesana famirapiratana isaky ny antsasak’adiny. Indraindray ny teleskaopy dia nahita fidina kely tao amin’ny famirapiratan’ny kintana iray, izay manondro fa ny planeta dia nanao zavatra. fitaterana–izany hoe nandalo teo anoloan’ny–ny endrika manjelanjelatra amin’ny kintan’ny ray aman-dreny. Indrisy anefa fa ny Kepler Nifarana aloha ny iraka rehefa tsy nahomby ny fitaovana iray tamin’ny May 2013.

Tamin’ny faramparan’ny taona 2009, ny Dr. Robert Olling, astronoma ao amin’ny Oniversiten’i Maryland ao amin’ny College Park, dia nanomboka nieritreritra momba ny inona Kepler mety ho vita raha mitodika mijery ny vahindanitra koa izy. Dr. Olling, izay mandinika ny supernova sy ny lavaka mainty, dia nahatsapa fa, toy ny kintana, ny vahindanitra dia mamirapiratra miaraka amin’ny famirapiratana tsy miovaova. Na izany aza, raha misy fisehoan-javatra tsy mahazatra – toy ny famahanana ny lavaka mainty, na ny fipoahan’ny kintana goavam-be iray – dia mety hihamafy ny famirapiratan’ny vahindanitra iray. Taorian’ny Dr. Olling sy ny roa tamin’ireo mpiara-miasa aminy, Dr. Richard Mushotsky sy Dr. Edward Shaya, ao amin’ny Oniversiten’i Maryland, dia nanolotra soso-kevitra ho an’ny Kepler Ny teleskaopy dia nanomboka nibanjina ny vahindanitra 400 nandihy teo amin’ny sehatry ny fijeriny.

Fipoahana!

Mipoaka ny ankamaroan’ny supernova rehefa mipoaka ny kintana manirery sy “maty”. Matetika, ny supernova progenitor dia kintana mavesatra, miaraka amin’ny fotony goavam-be milanja eo amin’ny 1,4 amin’ny herin’ny masoandro. Izany no atao hoe ny Chandrasekhar limit. Ny kintana kely kokoa sy tsy dia mavesatra loatra – tahaka ny Masoandrontsika – matetika dia tsy levona amin’ny herisetra mamiratra amin’ny fipoahana supernova, toy ny fianakavian’izy ireo lehibe kokoa. Ny kintana madinika, tahaka ny Masoandrontsika, dia “malemy fanahy kokoa ao anatin’io alina tsara io”, ary levona ao anatin’ny fiadanana—ary hatsaran-tarehy lehibe. Ny Masoandrontsika, amin’izao fotoana izao, dia tena mahazatra ary somary kely (amin’ny fenitry ny kintana), main-sequence kintana (mirehitra hydrogène). Hita eny amin’ny lanitra misy antsika amin’ny antoandro izy io ho toy ny bolabolamena lehibe manjelanjelatra sy manjelanjelatra. Misy planeta lehibe valo, volana maro be mamosavy, ary karazana vatana hafa kely kokoa miodina manodidina ny Masoandrontsika, izay monina amim-pifaliana any amin’ny faritra lavitra an’ny vahindanitra lehibe, mijoalajoala, voasakana, ny Milky Way. Tsy ho velona mandrakizay ny Masoandrontsika. Tahaka ny kintana rehetra, voaheloka ho faty izy io, amin’ny fotoana iray – fa, amin’ny trangan’ny Masoandrontsika, dia tsy ho ela. Ny kintana iray, amin’ny lanjan’ny Masoandrontsika, dia afaka “miaina” mandritra ny 10 lavitrisa taona eo ho eo, mampifangaro amim-pifaliana ny hydrogène amin’ny fotony ho lasa singa atomika mavesatra kokoa, ao anatin’ny dingana iray antsoina hoe nucleosynthesis kintana.

Na izany aza, ny Masoandrontsika dia tsy zaza kintana mitsambikina amin’izao fotoana izao. Raha ny marina dia kintana efa antitra izy io. Na izany aza, miaina eo antenatenan’ny androm-piainany izy, ary mbola feno fientanam-po mba hanohizana ny hidrôzenina ao anaty fotony mandritra ny 5 lavitrisa taona hafa, eo ho eo. Ny Masoandrontsika dia eo amin’ny 4,56 lavitrisa taona eo ho eo amin’izao fotoana izao – tsy tanora izy raha ny kintana, fa tsy antitra loatra koa.

Rehefa nahavita nampitambatra ny ankamaroan’ny famatsiana hydrogène ny kintana toa ny Masoandrontsika, dia nanomboka nitombo izy ireo ka lasa manjelanjelatra sy mivonto. kintana goavam-be mena. Ny kintana efa antitra toa ny Masoandro dia manana fo heliôma, voahodidin’ny akorandriaka izay mbola mitambatra ho hélium ny hidrôzenina. Mipoitra ety ivelany ny akorandriaka, ary mihamitombo hatrany ny fon’ilay kintana izay efa maty, rehefa mihalehibe ilay kintana. Avy eo ny fo heliôma dia manomboka mihintsana eo ambanin’ny lanjany manokana, ary mihamafana hatrany hatrany izy mandra-pahatongan’ny farany, dia lasa mafana be ny afovoany ka ny hélium izao dia mitambatra ao anatin’ilay singa atomika mbola mavesatra kokoa. karbaona. Ny kintana kely mitovitovy amin’ny Masoandro dia miafara amin’ny fo kely mafana be izay mamoaka angovo bebe kokoa noho ny taloha, fony izy mbola kely. main-sequence kintana. Ny sosona ivelany amin’ireo zokiolona, ​​kintana efa ho faty dia nibontsina hatramin’ny habeny mahatsiravina. Ao amin’ny rafi-masoandrontsika manokana, rehefa lasa ny Masoandrontsika Red Giant, dia hohaniny ny sasany amin’ireo zanany ao amin’ny planeta – voalohany i Mercury, avy eo Venus – ary avy eo (angamba), ny Tany. Ny mari-pana amin’ny faritra mirehitra amin’ity loza ity Red Giant dia ho mangatsiatsiaka kokoa noho ny tamin’ny andron’ny Masoandrontsika izay mbola tanora, nahery vaika main-sequence kely, kintana kely!

Ny fahafatesan’ny kintana kely somary malemy, toa ny Masoandrontsika, dia miavaka amin’ny fikotrokotroky ny masony ivelany misy gaza mamirapiratra sy maro loko, ary ireo zavatra ireo dia tena tsara tarehy ka dia antsoina matetika hoe “lolon’ny Cosmos.” ” nataon’ireo astronoma ody.

Ny Masoandrontsika dia ho faty amin’izany fomba izany – miaraka amin’ny fiadanana azo ampitahaina, ary ny hatsaran-tarehy lehibe. Izany dia satria ny Masoandrontsika dia manirery. Ny fatin’ny Masoandro dia ho sisa tavela amin’ny kintana kely sy matevina antsoina hoe a dwarf fotsyary ny fonony dia ho “lolo” Cosmic mamirapiratra.

Na izany aza, misy zavatra hafa tena mitranga rehefa misy kintana kely karazana masoandro mipetraka ao anaty rafitra binary miaraka amin’ny kintana rahavavy iray hafa. Ny kintan’ny anabavy dia manelingelina amin’ny fomba tsy mendrika ny maha-tokana ny iray tam-po aminy, ary amin’ity tranga ity dia lasa supernova ilay kintana kely ho faty – toy ny havany be kintana lehibe kokoa, rehefa tonga amin’ny faran’ny lalana kintana izy ireo.

Supernova Surprise!

Kepler Ny angon-drakitra dia nanambara supernovae dimy farafahakeliny – ary mety ho valo – nandritra ny roa taona. Farafahakeliny ny roa tamin’izy ireo no fantatra fa Type Ia, ary nalaina tamin’ny antsipiriany ara-nofo bebe kokoa noho ny teo aloha ny fahazavan’izy ireo. Ity fampahalalana vaovao ity dia manampy ny fahatokisana ny teoria izay Type Ia supernovae vokatry ny fampiraisana roa dwarfs fotsy–ny sisan’ny kintana mitovitovy amin’ny Masoandro mirefy tany. Ity fikarohana vaovao ity dia mametraka fisalasalana amin’ny modely tranainy sy efa ela izay Type Ia supernova dia vokatry ny irery dwarf fotsy mitsoka fitaovana avy amin’ny kintan’ny anabavy mpiara-mitory iray–ary niharam-boina. Ny kintana mpiara-mitory dia mety ho a main-sequence Kintana miendrika masoandro, na zokiolona, ​​mibontsina goavambe mena.

Ity fampahalalana vaovao ity dia ny fahitana mahagaga Kepler–izay ny tanjona lehibe indrindra dia ny hihaza planeta vahiny amin’ny fijerena kintana amin’ny manodidina antsika Galactic. Ny vahindanitra lavitra koa dia nandihy teo amin’ny sehatry ny fahitan’ny teleskaopy, ary ny fahombiazany tamin’ny fanangonana angon-drakitra isaky ny antsasak’adiny, miaraka amin’ny fahatsapany ny fiovana kely dia kely amin’ny famirapiratana, dia nahatonga azy ho tsara indrindra amin’ny firaketana ny fiakarana sy ny fianjeran’ny hazavana alefa mandritra ny fipoahana supernova. .

Ny Dr. Olling dia tsara vintana nahita ny duo Type Ia supernovae taorian’ny fandinihana roa taona momba ny vahindanitra 400 eo ho eo Kepler’s saha. Nitatitra ny fahitany ny 8 Janoary 2014 izy, nandritra ny fivorian’ny AAS amin’ny ririnina. « Amin’ny maha tour de force teknika azy dia tena mahafinaritra ny mampiasa azy Kepler mihoatra noho izay nokasaina,” hoy ny Dr. Robert P. Kirshner tamin’ny mpanao gazety nandritra ny fivorian’ny AAS. Dr. Kirshner dia astronoma ao amin’ny Harvard-Smithsonian Center for Astrophysics any Cambridge, Massachusetts.

Amin’ny lafiny sasany, ny angona voaangona dia tsy misy dikany. Izany dia satria ny fandrefesana ny famirapiratry ny famirapiratana ihany no ahitana azy ireo, noho izany dia tsy afaka manao kajy ny antsipirihan’ny antsipirihan’ny astronoma toy ny rafitra roa misy ny duo. Type Ia fipoahana, ary ny zavatra simika natsipin’izy ireo tamin’ny habakabaka. Kepler indray mandeha isaky ny telo volana ihany koa no nandefa angona niverina teto an-tany. Satria manjavozavo ny supernova taorian’ny famirapiratana nandritra ny herinandro maromaro, dia tsy afaka nanondro teleskaopy hafa amin’ny supernova ny astronoma. Kepler nitsidika mba hanangonana fandinihana lavorary kokoa.

Type Ia fipoahana no endrika hita matetika indrindra amin’ny supernovae. Kepler’s Ny angon-drakitra dia nanome fanazavana sarobidy momba ny antony mahatonga ireo fipoahana kintana ireo. ny Kepler Ny angon-drakitra dia manampy ny astronoma hanavaka ny toe-javatra roa mifaninana supernovae. Samy mitaky izany a dwarf fotsy manangona zavatra kintana avy amin’ny mpiara-mitory aminy, mandra-pipoitra ny fanerena ny fipoahana thermonuclear. Na izany aza, amin’ny modely mpiara-miasa, ny akorandriaka mivelatra amin’ny fitaovana avy amin’ny dwarf fotsy dia hidona amin’ny kintan’ny rahavavy. Hiteraka hafanana sy hazavana fanampiny izany – izay hiseho ho toy ny tampotampoka amin’ny andro voalohan’ny famirapiratan’ny supernova. Na izany aza, tsy nisy fivontosana toy izany hita tao amin’ny antontan-taratasin’i Dr. Olling.

Izany indrindra no manapaka goavambe mena mpiara-mitory aminy, hoy ny fanazavan’ny Dr. Olling tamin’ny fivorian’ny AAS, satria ireo kintana lehibe sy mibontsina ary efa antitra ireo dia mety hiteraka fivontosana lehibe mahafinaritra. Na izany aza, ny angon-drakitra dia mety mbola hifanaraka amin’ny modely amin’ny mpiara-dia kely kokoa, mitovy amin’ny Masoandro, hoy ny Dr. Daniel Kassen tamin’ny gazety tamin’ny 14 Janoary 2014. Dr. Kassen dia astronoma ao amin’ny University of California, Berkeley, ary mpiara-miasa amin’ny Dr. Olling tamin’ny fanadihadiana. Tsy ireo kintana somary bitika ireo ihany no hahatonga fibontsina kely kokoa, fa mety ho tsinontsinoavina tanteraka koa ny fivontosana, arakaraka ny fijerin’ny mpanara-baovao, hoy hatrany ny fanazavan’ny Dr. Kassen.

Nandritra ny fotoana ela, ny modely ny Type Ia supernovae vokatry ny fampitambatra dwarfs fotsy Tsy dia nalaza loatra teo amin’ny astronoma satria noheverina fa miadana be ny dingana farany amin’ny fampivondronana – nandritra ny an’arivony taona. Ny fampiakarana tsikelikely ny fitaovana toy izany dia mety hitarika amin’ny famoronana a kintana neutron. Na izany aza, tamin’ny 2010, ny simulation dia nanoro hevitra fa mety hitranga haingana kokoa ny fampivondronana toy izany – ao anatin’ny segondra na minitra, ary izany dia mamela ny fiovana tampoka sy tampoka izay miteraka fipoahana toy izany.

Mety misy olana anefa, amin’ny scenario fampiraisana. Dr. Craig Wheeler dia nanamarika tao amin’ny laharana 14 Janoary 2014 an’ny Vaovao momba ny natiora fa ny simulation amin’ny fampivondronana matetika dia mampiseho fipoahana asymmetrika be loatra – kanefa ny fandinihana hatreto dia toa boribory kokoa. Dr. Wheeler dia manam-pahaizana momba ny supernova ao amin’ny Oniversiten’i Texas ao Austin.

Dr. Olling dia mino fa zava-dehibe ny manao fandinihana miaraka amin’ny fampiasana ‘scopes mifototra amin’ny tany. Izany dia satria Kepler afaka mirakitra ny famirapiratana ihany ary tsy afaka mizara hazavana ho spectra. Na izany aza, mba hanaovana izany, Kepler mila tondroina amin’ny lafiny mifanohitra. Manantena ny Dr. Olling fa ny Kepler ny ekipa dia hamela izany rehefa NASA manambara ny drafitra ho avy ho an’ny sambon-danitra kilemaina mandritra ny fahavaratra 2014.

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