2012A&A...541A..26P


C.D.S. - SIMBAD4 rel 1.7 - 2021.06.17CEST20:03:51

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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Number of rows : 7

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 CoRoT-7 * 06 43 49.4690410679 -01 03 46.825797768   12.78 11.73 11.36 10.87 K0V 177 1
2 CoRoT-7b Pl 06 43 49.4690410679 -01 03 46.825797768           ~ 365 1
3 CoRoT-7d Pl? 06 43 49.4690410679 -01 03 46.825797768           ~ 12 1
4 CoRoT-7c Pl 06 43 49.4690410679 -01 03 46.825797768           ~ 43 1
5 NAME G 139-21b Pl 17 15 18.9337265994 +04 57 50.064695682           ~ 578 1
6 HD 189733b Pl 20 00 43.7130382888 +22 42 39.071811263           ~ 1177 1
7 HD 209458b Pl 22 03 10.7729598762 +18 53 03.548248479           ~ 1580 1

    Equat.    Gal    SGal    Ecl

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