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Discovery and Mass Measurements of a Cold, 10-Earth Mass Planet and Its Host Star (CROSBI ID 174438)

Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija

Muraki, Y. ; ... ; Dominis Prester, Dijana ; ... ; Soszynski, I. Discovery and Mass Measurements of a Cold, 10-Earth Mass Planet and Its Host Star // The Astrophysical journal, 741 (2011), 1; 22-60

Podaci o odgovornosti

Muraki, Y. ; ... ; Dominis Prester, Dijana ; ... ; Soszynski, I.

engleski

Discovery and Mass Measurements of a Cold, 10-Earth Mass Planet and Its Host Star

We present the discovery and mass measurement of the cold, low-mass planet MOA-2009-BLG-266Lb, made with the gravitational microlensing method. This planet has a mass of m_p = 10.4 +- 1.7 Earth masses and orbits a star of mass M_* = 0.56 +- 0.09 Solar masses at a semi-major axis of a = 3.2 (+1.9 -0.5) AU and an orbital period of P = 7.6 (+7.7 -1.5}; ; ; ; yrs. The planet and host star mass measurements are enabled by the measurement of the microlensing parallax effect, which is seen primarily in the light curve distortion due to the orbital motion of the Earth. But, the analysis also demonstrates the capability to measure microlensing parallax with the Deep Impact (or EPOXI) spacecraft in a Heliocentric orbit. The planet mass and orbital distance are similar to predictions for the critical core mass needed to accrete a substantial gaseous envelope, and thus may indicate that this planet is a "failed" gas giant. This and future microlensing detections will test planet formation theory predictions regarding the prevalence and masses of such planets.

gravitational lensing: micro; planetary systems

OGLE Collaboration

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Podaci o izdanju

741 (1)

2011.

22-60

objavljeno

0004-637X

Povezanost rada

Fizika

Poveznice
Indeksiranost