Escape of the martian protoatmosphere and initial water inventory

N. V. Erkaev, H. Lammer, Linda Elkins-Tanton, A. Stökl, P. Odert, E. Marcq, E. A. Dorfi, K. G. Kislyakova, Yu N. Kulikov, M. Leitzinger, M. Güdel

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

Latest research in planet formation indicates that Mars formed within a few million years (Myr) and remained as a planetary embryo that never grew to a more massive planet. It can also be expected from dynamical models that most of Mars' building blocks consisted of material that formed in orbital locations just beyond the ice line which could have contained ~0.1-0.2wt.% of H 2O. By using these constraints, we estimate the nebula-captured and catastrophically outgassed volatile contents during the solidification of Mars' magma ocean and apply a hydrodynamic upper atmosphere model for the study of the soft X-ray and extreme ultraviolet (XUV) driven thermal escape of the martian protoatmosphere during the early active epoch of the young Sun. The amount of gas that has been captured from the protoplanetary disk into the planetary atmosphere is calculated by solving the hydrostatic structure equations in the protoplanetary nebula. Depending on nebular properties such as the dust grain depletion factor, planetesimal accretion rates and luminosities, hydrogen envelopes with masses ≥3×1019g to ≤ times could have been captured from the nebula around early Mars. Depending on the before mentioned parameters, due to the planets low gravity and a solar XUV flux that was ~100 times stronger compared to the present value, our results indicate that early Mars would have lost its nebular captured hydrogen envelope after the nebula gas evaporated, during a fast period of ~0.1-7.5Myr. After the solidification of early Mars' magma ocean, catastrophically outgassed volatiles with the amount of ~50-250bar H and ~10-55bar CO could have been lost during ~0.4-12Myr, if the impact related energy flux of large planetesimals and small embryos to the planet's surface lasted long enough, that the steam atmosphere could have been prevented from condensing. If this was not the case, then our results suggest that the timescales for H;bsubesub condensation and ocean formation may have been shorter compared to the atmosphere evaporation timescale, so that one can speculate that sporadically periods, where some amount of liquid water may have been present on the planet's surface. However, depending on the amount of the outgassed volatiles, because of impacts and the high XUV-driven atmospheric escape rates, such sporadically wet surface conditions may have also not lasted much longer than ~0.4-12Myr. After the loss of the captured hydrogen envelope and outgassed volatiles during the first 100 Myr period of the young Sun, a warmer and probably wetter period may have evolved by a combination of volcanic outgassing and impact delivered volatiles ~4.0±0.2Gyr ago, when the solar XUV flux decreased to values that have been <10 times that of today's Sun.

Original languageEnglish (US)
Pages (from-to)106-119
Number of pages14
JournalPlanetary and Space Science
Volume98
DOIs
StatePublished - 2014
Externally publishedYes

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mars
escape
Mars
planets
nebulae
planet
water
oceans
envelopes
protoplanets
planetesimal
embryos
hydrogen
solidification
magma
embryo
ocean
x rays
timescale
atmospheres

Keywords

  • Atmospheric escape
  • Early mars
  • Evolution
  • Protoatmospheres

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Escape of the martian protoatmosphere and initial water inventory. / Erkaev, N. V.; Lammer, H.; Elkins-Tanton, Linda; Stökl, A.; Odert, P.; Marcq, E.; Dorfi, E. A.; Kislyakova, K. G.; Kulikov, Yu N.; Leitzinger, M.; Güdel, M.

In: Planetary and Space Science, Vol. 98, 2014, p. 106-119.

Research output: Contribution to journalArticle

Erkaev, NV, Lammer, H, Elkins-Tanton, L, Stökl, A, Odert, P, Marcq, E, Dorfi, EA, Kislyakova, KG, Kulikov, YN, Leitzinger, M & Güdel, M 2014, 'Escape of the martian protoatmosphere and initial water inventory', Planetary and Space Science, vol. 98, pp. 106-119. https://doi.org/10.1016/j.pss.2013.09.008
Erkaev, N. V. ; Lammer, H. ; Elkins-Tanton, Linda ; Stökl, A. ; Odert, P. ; Marcq, E. ; Dorfi, E. A. ; Kislyakova, K. G. ; Kulikov, Yu N. ; Leitzinger, M. ; Güdel, M. / Escape of the martian protoatmosphere and initial water inventory. In: Planetary and Space Science. 2014 ; Vol. 98. pp. 106-119.
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AU - Marcq, E.

AU - Dorfi, E. A.

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