2008A&A...479..579P


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.04CEST21:36:49

2008A&A...479..579P - Astronomy and Astrophysics, volume 479, 579-584 (2008/2-4)

X-ray induced mass loss effects on exoplanets orbiting dM stars.

PENZ T. and MICELA G.

Abstract (from CDS):

We study the influence of the X-ray luminosity distribution of dM stars on mass loss from planets on close-in orbits. Using the X-ray luminosity of the Pleiades, the Hyades, and field dM stars, we construct a scaling law for the radiation environment of dM stars for ages between 0.1 and 10Gyr. An energy-limited escape approach is used to calculate the influence of thermal mass loss on planetary distribution functions. We show that the X-ray luminosity distribution of nearby dM stars can be described by using a scaling law derived from observations of open clusters with a given age. It is shown that the X-ray flux from dM stars is significantly less than the flux from dG stars for a given orbital distance. Therefore, loss processes have less of an impact on the mass evolution of planets orbiting dM stars. We found that the mass loss is negligible for hydrogen-rich Jupiter-mass planets at orbits >0.02AU, while Neptune-mass planets are influenced up to 0.05AU. At orbits of 0.02AU, Roche lobe effects are also having a strong impact on the mass-loss evolution. Because of the low mass of dM stars, Roche lobe effects are less effective for loss processes at planets orbiting these stars. Finally, if we use only the X-ray luminosity of their host stars for the energy input to the atmosphere, we obtain a lower limit for the mass loss of GJ876d and GJ674b. This does not allow us to conclude whether they are remnants of eroded Jupiter-mass planets.

Abstract Copyright:

Journal keyword(s): X-rays: stars - stars: luminosity function, mass function - planets and satellites: general - stars: late-type - stars: planetary systems

Simbad objects: 12

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Number of rows : 12

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 Cl Melotte 22 OpC 03 47 00 +24 07.0           ~ 2978 0
2 Cl Melotte 25 OpC 04 26 54.00 +15 52 00.0           ~ 2654 0
3 L 675-81 PM* 08 40 59.2055621000 -23 27 22.598649814   13.2 11.975 11.637 9.37 M3.5V 105 1
4 Ross 905b Pl 11 42 11.0933874353 +26 42 23.658083337           ~ 591 1
5 Ross 905 PM* 11 42 11.0933874353 +26 42 23.658083337   12.06 10.613 10.272 8.24 M3V 495 1
6 V* V645 Cen Er* 14 29 42.9451234609 -62 40 46.170818907 14.21 12.95 11.13 9.45 7.41 M5.5Ve 957 0
7 BD-07 4003 BY* 15 19 26.8271336166 -07 43 20.190958776 13.403 11.76 10.560 9.461 8.911 M3V 533 2
8 CD-46 11540b Pl 17 28 39.9455601300 -46 53 42.693246243           ~ 43 1
9 CD-46 11540 PM* 17 28 39.9455601300 -46 53 42.693246243 12.177 10.973 9.407 8.337 7.006 M3V 205 1
10 BD-05 5715 PM* 22 09 40.3443754647 -04 38 26.651267098 13.006 11.868 10.366 9.279 7.877 M3.5V 220 1
11 BD-15 6290d Pl 22 53 16.7323107416 -14 15 49.303409936           ~ 134 1
12 BD-15 6290 BY* 22 53 16.7323107416 -14 15 49.303409936 12.928 11.749 10.192 9.013 7.462 M3.5V 856 1

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2020.07.04-21:36:49

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