Effects of mass loss for highly-irradiated giant planets

William B. Hubbard, M. F. Hattori, A. Burrows, Ivan - Hubeny, D. Sudarsky

Research output: Contribution to journalArticle

51 Citations (Scopus)

Abstract

We present calculations for the evolution and surviving mass of highly-irradiated extrasolar giant planets (EGPs) at orbital semimajor axes ranging from 0.023 to 0.057 AU using a generalized scaled theory for mass loss, together with new surface-condition grids for hot EGPs and a consistent treatment of tidal truncation. Theoretical estimates for the rate of energy-limited hydrogen escape from giant-planet atmospheres differ by two orders of magnitude, when one holds planetary mass, composition, and irradiation constant. Baraffe et al. [Baraffe, I., Selsis, F., Chabrier, G., Barman, T.S., Allard, F., Hauschildt, P.H., Lammer, H., 2004. Astron. Astrophys. 419, L13-L16] predict the highest rate, based on the theory of Lammer et al. [Lammer, H., Selsis, F., Ribas, I., Guinan, E.F., Bauer, S.J., Weiss, W.W., 2003. Astrophys. J. 598, L121-L124]. Scaling the theory of Watson et al. [Watson, A.J., Donahue, T.M., Walker, J.C.G., 1981. Icarus 48, 150-166] to parameters for a highly-irradiated exoplanet, we find an escape rate ∼ 102 lower than Baraffe's. With the scaled Watson theory we find modest mass loss, occurring early in the history of a hot EGP. In this theory, mass loss including the effect of Roche-lobe overflow becomes significant primarily for masses below a Saturn mass, for semimajor axes ≥ 0.023   AU. This contrasts with the Baraffe model, where hot EGPs are claimed to be remnants of much more massive bodies, originally several times Jupiter and still losing substantial mass fractions at present.

Original languageEnglish (US)
Pages (from-to)358-364
Number of pages7
JournalIcarus
Volume187
Issue number2
DOIs
StatePublished - Apr 2007

Fingerprint

planets
planet
escape
planetary mass
Saturn
extrasolar planets
loss
effect
Jupiter (planet)
lobes
Jupiter
grids
histories
irradiation
scaling
atmospheres
orbitals
hydrogen
estimates
atmosphere

Keywords

  • Extrasolar planets
  • Jovian planets
  • Thermal histories

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Effects of mass loss for highly-irradiated giant planets. / Hubbard, William B.; Hattori, M. F.; Burrows, A.; Hubeny, Ivan -; Sudarsky, D.

In: Icarus, Vol. 187, No. 2, 04.2007, p. 358-364.

Research output: Contribution to journalArticle

Hubbard, William B. ; Hattori, M. F. ; Burrows, A. ; Hubeny, Ivan - ; Sudarsky, D. / Effects of mass loss for highly-irradiated giant planets. In: Icarus. 2007 ; Vol. 187, No. 2. pp. 358-364.
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