CoKu Tau/4 is a pre-main-sequence binary T Tauri star system in the constellation Taurus. The stars are surrounded by a circumbinary disc with a central cavity of radius 10 astronomical units. Before its binary nature was known, the central cavity in the system's disc was thought to have been cleared out by a planet of at least 10 Jupiter masses, a rare example of a so-called "transitional disc". This model was disproven in 2008 when the star was resolved using adaptive optics as a system of two near-equal-mass stars with a projected separation of 8 AU. The central cavity is thus cleared out by the stars, not by the gravitational influence of a planet.
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| - CoKu Tau/4 (en)
- CoKu Tauri/4 (es)
- CoKu Tau/4 (ko)
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| - CoKu Tau/4 is a pre-main-sequence binary T Tauri star system in the constellation Taurus. The stars are surrounded by a circumbinary disc with a central cavity of radius 10 astronomical units. Before its binary nature was known, the central cavity in the system's disc was thought to have been cleared out by a planet of at least 10 Jupiter masses, a rare example of a so-called "transitional disc". This model was disproven in 2008 when the star was resolved using adaptive optics as a system of two near-equal-mass stars with a projected separation of 8 AU. The central cavity is thus cleared out by the stars, not by the gravitational influence of a planet. (en)
- CoKu Tau/4는 전주계열성 단계에 속하는, 황소자리 T형 항성 두 개로 이루어진 쌍성계이다. 두 별은 별주위 원반에 둘러싸여 있으며 둘의 질량 중심으로부터 10 천문단위 반경 규모의 '구멍'(물질들이 쓸려 나가 깨끗해진 영역)이 형성되어 있다. 예전에는 이 구멍이 목성질량 10배 정도 행성이 존재하기 때문에 생긴 구조로 생각되었으며 따라서 흔치 않은 소위 '과도기적 원반'의 예로 취급되었다. 그러나 적응 제어 광학적 기술을 사용하여 검증한 결과 행성은 없었고 대신 질량이 거의 같은 쌍둥이 별이 서로 8 천문단위 정도 떨어져 있는 것으로 밝혀졌다. 결국 중앙부의 깨끗한 부분은 행성이 아니라 항성의 중력 작용 때문인 것으로 드러났다. (ko)
- CoKu Tauri/4 o CoKu Tau 4 (HBC 421) es una estrella de la constelación de Tauro. De tipo espectral M1.5, se encuentra a unos 420 años luz de distancia del Sistema Solar. CoKu Tauri/4 es una joven estrella pre-secuencia principal T Tauri con una edad estimada de solo 1 millón de años. Su luminosidad es solo el 61% de la luminosidad solar y su masa se estima entre 0,5 y 0,66 masas solares. Como curiosidad cabe señalar que a fecha de enero de 2007, el planeta de CoKu Tauri/4 ostentaba en el Libro Guiness el récord de planeta extrasolar más joven. (es)
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| - CoKu Tauri/4, CoKu Tau-Aur Star 4, HBC 421, 2MASS J04411681+2840000 (en)
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| - CoKu Tau/4 is a pre-main-sequence binary T Tauri star system in the constellation Taurus. The stars are surrounded by a circumbinary disc with a central cavity of radius 10 astronomical units. Before its binary nature was known, the central cavity in the system's disc was thought to have been cleared out by a planet of at least 10 Jupiter masses, a rare example of a so-called "transitional disc". This model was disproven in 2008 when the star was resolved using adaptive optics as a system of two near-equal-mass stars with a projected separation of 8 AU. The central cavity is thus cleared out by the stars, not by the gravitational influence of a planet. (en)
- CoKu Tauri/4 o CoKu Tau 4 (HBC 421) es una estrella de la constelación de Tauro. De tipo espectral M1.5, se encuentra a unos 420 años luz de distancia del Sistema Solar. CoKu Tauri/4 es una joven estrella pre-secuencia principal T Tauri con una edad estimada de solo 1 millón de años. Su luminosidad es solo el 61% de la luminosidad solar y su masa se estima entre 0,5 y 0,66 masas solares. CoKu Tauri/4 se encuentra rodeada por un extenso disco de polvo, típico de estrellas muy jóvenes. En 2004 Joel Green y Dan Watson, utilizando el espectrógrafo infrarrojo (IRS) del Telescopio espacial Spitzer, detectaron un espacio vacío en el disco circunestelar que rodea la estrella. El hueco tiene aproximadamente 10 UA de diámetro. Se pensaba que estaba originado por un planeta en órbita alrededor de CoKu Tauri/4 que habría barrido una gran parte del material del disco interior, e impedido que el material del anillo exterior cayera hacia la estrella. Se estimaba que la masa del posible planeta sería mayor que 0,1 veces la masa de Júpiter. Se han observado otros discos con bordes y sus correspondientes espacios vacíos, pero en objetos más antiguos y a escalas mayores, como GM Aurigae y HR 4796 A. Como curiosidad cabe señalar que a fecha de enero de 2007, el planeta de CoKu Tauri/4 ostentaba en el Libro Guiness el récord de planeta extrasolar más joven. El planeta fue refutado en 2008, cuando la estrella se resolvió con ópticas adaptativas como un sistema de dos estrellas cercanas de casi igual masa con una separación proyectada de 8 UA una de la otra. La cavidad central es, pues, aclarada por las estrellas, no por la influencia gravitacional de un planeta. (es)
- CoKu Tau/4는 전주계열성 단계에 속하는, 황소자리 T형 항성 두 개로 이루어진 쌍성계이다. 두 별은 별주위 원반에 둘러싸여 있으며 둘의 질량 중심으로부터 10 천문단위 반경 규모의 '구멍'(물질들이 쓸려 나가 깨끗해진 영역)이 형성되어 있다. 예전에는 이 구멍이 목성질량 10배 정도 행성이 존재하기 때문에 생긴 구조로 생각되었으며 따라서 흔치 않은 소위 '과도기적 원반'의 예로 취급되었다. 그러나 적응 제어 광학적 기술을 사용하여 검증한 결과 행성은 없었고 대신 질량이 거의 같은 쌍둥이 별이 서로 8 천문단위 정도 떨어져 있는 것으로 밝혀졌다. 결국 중앙부의 깨끗한 부분은 행성이 아니라 항성의 중력 작용 때문인 것으로 드러났다. (ko)
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