WISE 0359-5401

WISE 0359-5401
Observationsdata
Epok: J2000.0
StjärnbildRombiska nätet
Rektascension03t 59m 34,06s[1]
Deklination-54° 01′ 54,6″[1]
Skenbar magnitud ()+22,20 ± 0,43[1] (H; MKO-NIR filtersystem)
Stjärntyp
SpektraltypY0[1]
Astrometri
Egenrörelse (µ)RA: -177 ± 53[2] mas/år
Dek.: -930 ± 62[2] mas/år
Parallax ()73,6 ± 2,0[3]
Avstånd44 ± 1  (13,6 ± 0,4 pc)
Detaljer
Massa14[4] MJup M
Radie0,940 +0,074−0,057[1] RJup R
Temperatur467 ± 16[5] K
Metallicitet+0[5]
Ålder2,5[5] miljarder år
Andra beteckningar
WISEA J035934.07-540154.8, WISE J035934.06-540154.6[6][1]

WISE 0359-5401 är en ensam stjärna belägen i den norra delen av stjärnbilden Rombiska nätet. Den har en lägsta skenbar magnitud av ca 22,20[1] och kräver ett teleskop med kamera för att kunna observeras. Baserat på parallaxmätning på ca 73,6 mas,[3] beräknas den befinna sig på ett avstånd på ca 44 ljusår (13,6 parsek) från solen, även om tidigare den trigonometriska parallaxen för WISE 0359−5401 visat 0,145 ± 0,039 bågsekund[2], vilket motsvarar ett direkt inversionsavstånd[7] på 6,9 +2,5−1,5 parsek eller 22,5 +8,3−4,8 ljusår.

Observation

WISE 0359−5401 upptäcktes 2012 av J. Davy Kirkpatrick et al. från data som samlats in av Wide-field Infrared Survey Explorer (WISE) i infraröda bandet vid en våglängd av 4,6 μm, vars uppdrag varade från december 2009 till februari 2011. År 2012 publicerade de en artikel i The Astrophysical Journal, där de presenterade upptäckten av sju nya bruna dvärgar av spektraltyp Y funna av WISE, bland vilka också fanns WISE 0359−5401.[1]

Egenskaper

WISE 0359−5401 sett av Hubble Space Telescope.
Foto: NASA/ESA Hubble Space Telescope

WISE 0359-5401 är en brun dvärgstjärna av spektralklass Y0.[1] Den har en massa som är ca 14[4] Jupitermassor, en radie på ca 0,94[4] Jupiterradie och har en effektiv temperatur av ca 470 K.[5]

I juni 2023 blev WISE 0359−5401 den första Y-dvärgen med en spektral energifördelning mätt med JWST. Detta inkluderar ett spektrum taget av NIRSpec och MIRI LRS vid 1 till 12 μm, samt MIRI-fotometri vid 15, 18 och 21 μm. Molekylerna vatten (H2O), metan (CH4), kolmonoxid (CO), koldioxid (CO2) och ammoniak (NH3) noterades i WISE 0359−5401. Metan är den huvudsakliga reservoaren för kol, men det finns tillräckligt med kol för påvisbar kolmonoxid och koldioxid. Studien mätte också en temperatur på 467 K.[5]

Se även

De andra sex upptäcka bruna dvärgarna, publicerade i Kirkpatrick et al. (2012) är:[1]

Referenser

Den här artikeln är helt eller delvis baserad på material från engelskspråkiga Wikipedia, WISE 0359-5401, 11 december 2023.

Noter

  1. ^ [a b c d e f g h i j] Kirkpatrick, J. Davy; Gelino, Christopher R.; Cushing, Michael C.; Mace, Gregory N.; Griffith, Roger L.; Skrutskie, Michael F.; Marsh, Kenneth A.; Wright, Edward L.; Eisenhardt, Peter R.; McLean, Ian S.; Mainzer, Amy K.; Burgasser, Adam J.; Tinney, Chris G.; Parker, Stephen; Salter, Graeme (2012). "Further Defining Spectral Type "Y" and Exploring the Low-mass End of the Field Brown Dwarf Mass Function". The Astrophysical Journal. 753 (2): 156. arXiv:1205.2122. Bibcode:2012ApJ...753..156K. doi:10.1088/0004-637X/753/2/156. S2CID 119279752.
  2. ^ [a b c] Marsh, Kenneth A.; Wright, Edward L.; Kirkpatrick, J. Davy; Gelino, Christopher R.; Cushing, Michael C.; Griffith, Roger L.; Skrutskie, Michael F.; Eisenhardt, Peter R. (2013). "Parallaxes and Proper Motions of Ultracool Brown Dwarfs of Spectral Types Y and Late T". The Astrophysical Journal. 762 (2): 119. arXiv:1211.6977. Bibcode:2013ApJ...762..119M. doi:10.1088/0004-637X/762/2/119. S2CID 42923100.
  3. ^ [a b] Kirkpatrick, J. Davy; Gelino, Christopher R.; Faherty, Jacqueline K.; Meisner, Aaron M.; Caselden, Dan; Schneider, Adam C.; Marocco, Federico; Cayago, Alfred J.; Smart, R. L.; Eisenhardt, Peter R.; Kuchner, Marc J. (2021). "The Field Substellar Mass Function Based on the Full-sky 20 pc Census of 525 L, T, and y Dwarfs". The Astrophysical Journal Supplement Series. 253 (1): 7. arXiv:2011.11616. Bibcode:2021ApJS..253....7K. doi:10.3847/1538-4365/abd107. S2CID 227126954.
  4. ^ [a b c] Beiler, Samuel A.; Cushing, Michael C.; Kirkpatrick, J. Davy; Schneider, Adam C.; Mukherjee, Sagnick; Marley, Mark S. (2023-07-01). "The First JWST Spectral Energy Distribution of a Y Dwarf". The Astrophysical Journal. 951 (2): L48. arXiv:2306.11807. Bibcode:2023ApJ...951L..48B. doi:10.3847/2041-8213/ace32c. ISSN 0004-637X.
  5. ^ [a b c d e] Leggett, S. K.; Tremblin, Pascal (25 Sep 2023). "The First Y Dwarf Data From JWST Show That Dynamic and Diabatic Processes Regulate Cold Brown Dwarf Atmospheres". ApJ. arXiv:2309.14567.
  6. ^ WISE J035934.06-540154.6 (unistra.fr) . Hämtad 2024-02-03.
  7. ^ Paterson, David.A. "Topics in Astronomy: Topic 8. Inappropriateness of the Lutz-Kelker equation for brown dwarfs". Hämtad 24 september 2015.

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