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เค2-18บี (อังกฤษ: K2-18b) หรือที่รู้จักกันในชื่อ EPIC 201912552 b เป็นดาวเคราะห์นอกระบบที่โคจรรอบดาวแคระแดง ซึ่งอยู่ห่างจากโลก 124 ปีแสง (38 พาร์เซก) ดาวเคราะห์ดวงนี้ถูกค้นพบครั้งแรกด้วยกล้องโทรทรรศน์อวกาศเคปเลอร์ มีขนาดประมาณแปดเท่าของมวลของโลก และจัดอยู่ในประเภทมินิเนปจูน มันมีวงโคจร 33 วันภายในเขตอาศัยได้ หมายความว่ามันได้รับแสงในปริมาณเท่ากันกับที่โลกได้รับจากดวงอาทิตย์และอาจมีสภาวะที่คล้ายกัน ซึ่งทำให้มีการดำรงอยู่ของน้ำที่เป็นของเหลวได้
| File:Esa-hubble-k2-18a impression.jpg Artist's impression of K2-18b (right) orbiting (left). The exoplanet is shown between them. | |
| ลักษณะของวงโคจร |
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ในปี ค.ศ. 2019 มีการค้นพบไอน้ำในบรรยากาศของ K2-18b ซึ่งดึงดูดความสนใจมาที่ระบบนี้ K2-18b ได้รับการศึกษาว่าเป็นโลกที่มีศักยภาพในการอาศัยได้ ซึ่งหากพิจารณาจากอุณหภูมิแล้วจะมีลักษณะคล้ายกับดาวเคราะห์ก๊าซ เช่น ดาวยูเรนัส หรือ ดาวเนปจูน มากกว่าโลก
ในปี ค.ศ. 2023 กล้องโทรทรรศน์อวกาศเจมส์ เวบบ์ ตรวจพบก๊าซคาร์บอนไดออกไซด์และมีเทนในชั้นบรรยากาศของดาวเคราะห์นอกระบบ K2-18b ข้อมูลของเวบบ์แนะนำว่าดาวเคราะห์อาจถูกปกคลุมไปด้วยมหาสมุทร โดยมีชั้นบรรยากาศที่อุดมด้วยไฮโดรเจน
อ้างอิง
- Benneke et al. 2019, p. 4.
ที่มา
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แหล่งข้อมูลอื่น
- K2-18 b Confirmed Planet Overview Page,
พิกัด: 
11h 30m 14.518s, +07° 35′ 18.257″
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ekh2 18bi xngkvs K2 18b hruxthiruckkninchux EPIC 201912552 b epndawekhraahnxkrabbthiokhcrrxbdawaekhraaedng sungxyuhangcakolk 124 piaesng 38 pharesk dawekhraahdwngnithukkhnphbkhrngaerkdwyklxngothrthrrsnxwkasekhpelxr mikhnadpramanaepdethakhxngmwlkhxngolk aelacdxyuinpraephthminienpcun mnmiwngokhcr 33 wnphayinekhtxasyid hmaykhwamwamnidrbaesnginprimanethaknkbthiolkidrbcakdwngxathityaelaxacmisphawathikhlaykn sungthaihmikardarngxyukhxngnathiepnkhxngehlwidekh2 18biFile Esa hubble k2 18a impression jpg Artist s impression of K2 18b right orbiting left The exoplanet is shown between them lksnakhxngwngokhcr inpi kh s 2019 mikarkhnphbixnainbrryakaskhxng K2 18b sungdungdudkhwamsnicmathirabbni K2 18b idrbkarsuksawaepnolkthimiskyphaphinkarxasyid sunghakphicarnacakxunhphumiaelwcamilksnakhlaykbdawekhraahkas echn dawyuerns hrux dawenpcun makkwaolk inpi kh s 2023 klxngothrthrrsnxwkasecms ewbb trwcphbkaskharbxnidxxkisdaelamiethninchnbrryakaskhxngdawekhraahnxkrabb K2 18b khxmulkhxngewbbaenanawadawekhraahxacthukpkkhlumipdwymhasmuthr odymichnbrryakasthixudmdwyihodrecnxangxingBenneke et al 2019 p 4 thima Adams Josephine C Engel Jurgen 2021 Life and Its Future phasaxngkvs Bibcode 2021lifu book A doi 10 1007 978 3 030 59075 8 ISBN 978 3 030 59074 1 S2CID 238774381 Barclay Thomas Kostov Veselin B Colon Knicole D Quintana Elisa V Schlieder Joshua E Louie Dana R Gilbert Emily A Mullally Susan E December 2021 Stellar Surface Inhomogeneities as a Potential Source of the Atmospheric Signal Detected in the K2 18b Transmission Spectrum The Astronomical Journal phasaxngkvs 162 6 300 2109 14608 Bibcode 2021AJ 162 300B doi 10 3847 1538 3881 ac2824 ISSN 1538 3881 S2CID 238215555 Bark Yu B Barkhudarov E M Kozlov Yu N Kossyi I A Silakov V P Taktakishvili M I Temchin S M 7 April 2000 Slipping surface discharge as a source of hard UV radiation Journal of Physics D Applied Physics 33 7 859 863 doi 10 1088 0022 3727 33 7 317 Bezard Bruno Charnay Benjamin Blain Doriann May 2022 Methane as a dominant absorber in the habitable zone sub Neptune K2 18 b Nature Astronomy phasaxngkvs 6 5 537 540 2011 10424 Bibcode 2022NatAs 6 537B doi 10 1038 s41550 022 01678 z ISSN 2397 3366 S2CID 227118701 Benneke Bjorn Werner Michael Petigura Erik Knutson Heather Dressing Courtney Crossfield Ian J M Schlieder Joshua E Livingston John Beichman Charles Christiansen Jessie Krick Jessica Gorjian Varoujan Howard Andrew W Sinukoff Evan Ciardi David R Akeson Rachel L January 2017 SPITZER OBSERVATIONS CONFIRM AND RESCUE THE HABITABLE ZONE SUPER EARTH K2 18b FOR FUTURE CHARACTERIZATION The Astrophysical Journal phasaxngkvs 834 2 187 1610 07249 Bibcode 2017ApJ 834 187B doi 10 3847 1538 4357 834 2 187 ISSN 0004 637X S2CID 12988198 Benneke Bjorn Wong Ian Piaulet Caroline Knutson Heather A Lothringer Joshua Morley Caroline V Crossfield Ian J M Gao Peter Greene Thomas P Dressing Courtney Dragomir Diana Howard Andrew W McCullough Peter R Kempton Eliza M R Fortney Jonathan J Fraine Jonathan December 2019 Water Vapor and Clouds on the Habitable zone Sub Neptune Exoplanet K2 18b The Astrophysical Journal Letters phasaxngkvs 887 1 L14 1909 04642 Bibcode 2019ApJ 887L 14B doi 10 3847 2041 8213 ab59dc ISSN 2041 8205 S2CID 209324670 Blain D Charnay B Bezard B 1 February 2021 1D atmospheric study of the temperate sub Neptune K2 18b Astronomy amp Astrophysics phasaxngkvs 646 A15 2011 10459 Bibcode 2021A amp A 646A 15B doi 10 1051 0004 6361 202039072 ISSN 0004 6361 S2CID 227118713 Changeat Quentin Edwards Billy Al Refaie Ahmed F Tsiaras Angelos Waldmann Ingo P Tinetti Giovanna 1 April 2022 Disentangling atmospheric compositions of K2 18 b with next generation facilities Experimental Astronomy phasaxngkvs 53 2 391 416 doi 10 1007 s10686 021 09794 w ISSN 1572 9508 PMC 9166872 PMID 35673553 James Chaneil December 2021 New class of potentially habitable ocean worlds defined Physics World phasaxngkvs 34 10 7ii doi 10 1088 2058 7058 34 10 09 ISSN 2058 7058 Charnay B Blain D Bezard B Leconte J Turbet M Falco A 1 February 2021 Formation and dynamics of water clouds on temperate sub Neptunes the example of K2 18b Astronomy amp Astrophysics phasaxngkvs 646 A171 2011 11553 Bibcode 2021A amp A 646A 171C doi 10 1051 0004 6361 202039525 ISSN 0004 6361 S2CID 227126636 Christie Duncan A Lee Elspeth K H Innes Hamish Noti Pascal A Charnay Benjamin Fauchez Thomas J Mayne Nathan J Deitrick Russell Ding Feng Greco Jennifer J Hammond Mark Malsky Isaac Mandell Avi Rauscher Emily Roman Michael T Sergeev Denis E Sohl Linda Steinrueck Maria E Turbet Martin Wolf Eric T Zamyatina Maria Carone Ludmila 28 November 2022 CAMEMBERT A Mini Neptunes General Circulation Model Intercomparison Protocol Version 1 0 A CUISINES Model Intercomparison Project The Planetary Science Journal phasaxngkvs 3 11 261 2211 04048 Bibcode 2022PSJ 3 261C doi 10 3847 PSJ ac9dfe ISSN 2632 3338 S2CID 254065685 Cubillos Patricio E Blecic Jasmina 12 June 2021 The pyrat bay framework for exoplanet atmospheric 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Raymond T March 2022 Atmospheric Dynamics of Temperate Sub Neptunes I Dry Dynamics The Astrophysical Journal phasaxngkvs 927 1 38 2112 11108 Bibcode 2022ApJ 927 38I doi 10 3847 1538 4357 ac4887 ISSN 0004 637X S2CID 245353401 Madhusudhan Nikku Nixon Matthew C Welbanks Luis Piette Anjali A A Booth Richard A February 2020 The Interior and Atmosphere of the Habitable zone Exoplanet K2 18b The Astrophysical Journal Letters phasaxngkvs 891 1 L7 2002 11115 Bibcode 2020ApJ 891L 7M doi 10 3847 2041 8213 ab7229 ISSN 2041 8205 S2CID 211505592 Madhusudhan Nikku Piette Anjali A A Constantinou Savvas August 2021 Habitability and Biosignatures of Hycean Worlds The Astrophysical Journal phasaxngkvs 918 1 1 2108 10888 Bibcode 2021ApJ 918 1M doi 10 3847 1538 4357 abfd9c ISSN 0004 637X S2CID 237290118 Madhusudhan Nikku Constantinou Savvas Moses Julianne I Piette Anjali Sarkar Subhajit 1 March 2021 Chemical Disequilibrium in a Temperate sub Neptune JWST Proposal Cycle 1 2722 Bibcode 2021jwst prop 2722M Mendex Abel 2016 Searching for Habitable Worlds An Introduction IOP Publishing doi 10 1088 978 1 6817 4401 8ch5 ISBN 978 1 68174 401 8 May E M Rauscher E April 2020 From Super Earths to Mini Neptunes Implications of a Surface on Atmospheric Circulation The Astrophysical Journal phasaxngkvs 893 2 161 2003 13348 Bibcode 2020ApJ 893 161M doi 10 3847 1538 4357 ab838b ISSN 0004 637X S2CID 214714012 Nixon Matthew C Madhusudhan Nikku 17 June 2021 How deep is the ocean Exploring the phase structure of water rich sub Neptunes Monthly Notices of the Royal Astronomical Society 505 3 3414 3432 doi 10 1093 mnras stab1500 Pierrehumbert Raymond T February 2023 The Runaway Greenhouse on Sub Neptune Waterworlds The Astrophysical Journal phasaxngkvs 944 1 20 2212 02644 Bibcode 2023ApJ 944 20P doi 10 3847 1538 4357 acafdf ISSN 0004 637X S2CID 254275443 Quintanilla Jose Cernicharo 2015 Wavelength Encyclopedia of Astrobiology phasaxngkvs Springer 2651 2652 doi 10 1007 978 3 662 44185 5 1685 Raymond Sean 2011 Atmosphere Primitive Envelope Encyclopedia of Astrobiology phasaxngkvs Springer 120 120 doi 10 1007 978 3 642 11274 4 131 Santos Leonardo A dos Ehrenreich David Bourrier Vincent Astudillo Defru Nicola Bonfils Xavier Forget Francois Lovis Christophe Pepe Francesco Udry Stephane 1 February 2020 The high energy environment and atmospheric escape of the mini Neptune K2 18 b Astronomy amp Astrophysics phasaxngkvs 634 L4 2001 04532 Bibcode 2020A amp A 634L 4D doi 10 1051 0004 6361 201937327 ISSN 0004 6361 S2CID 210472526 Scheucher Markus Wunderlich F Grenfell J L Godolt M Schreier F Kappel D Haus R Herbst K Rauer H July 2020 Consistently Simulating a Wide Range of Atmospheric Scenarios for K2 18b with a Flexible Radiative Transfer Module The Astrophysical Journal phasaxngkvs 898 1 44 2005 02114 Bibcode 2020ApJ 898 44S doi 10 3847 1538 4357 ab9084 ISSN 0004 637X S2CID 218502474 Spohn Tilman 2015 Tides Planetary Encyclopedia of Astrobiology phasaxngkvs Springer 2499 2504 doi 10 1007 978 3 662 44185 5 1592 Yu Xinting Moses Julianne Fortney Jonathan Zhang Xi 1 December 2021 How to identify exoplanet surfaces without seeing them The Astrophysical Journal phasaxngkvs 2021 1 P42A 05 2104 09843 doi 10 3847 1538 4357 abfdc7 S2CID 233307061 aehlngkhxmulxunK2 18 b Confirmed Planet Overview Page phikd 11h 30m 14 518s 07 35 18 257