SIMBAD references

2012A&A...541A..26P - Astronomy and Astrophysics, volume 541A, 26-26 (2012/5-1)

The high-energy environment in the super-Earth system CoRoT-7.

POPPENHAEGER K., CZESLA S., SCHROETER S., LALITHA S., KASHYAP V. and SCHMITT J.H.M.M.

Abstract (from CDS):

High-energy irradiation of exoplanets has been identified to be a key influence on the stability of these planets' atmospheres. So far, irradiation-driven mass-loss has been observed only in two Hot Jupiters, and the observational data remain even more sparse in the super-Earth regime. We present an investigation of the high-energy emission in the CoRoT-7 system, which hosts the first known transiting super-Earth. To characterize the high-energy XUV radiation field into which the rocky planets CoRoT-7b and CoRoT-7c are immersed, we analyzed a 25 ks XMM-Newton observation of the host star. Our analysis yields the first clear (3.5σ) X-ray detection of CoRoT-7. We determine a coronal temperature of ≃3MK and an X-ray luminosity of 3x1028erg/s. The level of XUV irradiation on CoRoT-7b amounts to ≃37000erg/cm2/s. Current theories for planetary evaporation can only provide an order-of-magnitude estimate for the planetary mass loss; assuming that CoRoT-7b has formed as a rocky planet, we estimate that CoRoT-7b evaporates at a rate of about 1.3x1011g/s and has lost ≃4-10 earth masses in total.

Abstract Copyright:

Journal keyword(s): stars: activity - planetary systems - planets and satellites: atmospheres - X-rays: stars - stars: coronae - X-rays: individual: CoRoT-7

Simbad objects: 7

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2020.11.29-09:56:20

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