Two Classes of Hot Jupiters

By Brad M. S. Hansen, Travis S. Barman. 2007

136 citations recorded by the source corpus.

We identify two classes of transiting planet, based on their equilibrium temperatures and Safronov numbers. We examine various possible explanations for the dichotomy. It may reflect the influence of planet or planetesimal scattering in determining when planetary migration stops. Another possibility is that some planets lose more mass to evaporation than others. If this evaporation process preferentially removes helium from the planet, the consequent reduction in the mean molecular weight may explain why some planets have anomalously large radii.

Subfields: Instrumentation, Statistical and Nonlinear Physics

View Paper: https://www.semanticscholar.org/paper/f2b3293f0f8849cffb30fc02efda9d564236399a

How researchers see this paper

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In Instrumentation

1. Jon Fortney
2. J. Southworth
3. M. Marley
4. J. Owen
5. G. Marcy
6. Sara Seager
7. D. Charbonneau
8. N. Madhusudhan

In Statistical and Nonlinear Physics

1. Jon Fortney
2. M. Marley
3. D. Sasselov
4. N. Nettelmann
5. J. Southworth
6. G. Marcy
7. D. Latham
8. Debra A. Fischer

Citations in the corpus

• DISCOVERY OF A TRANSITING PLANET AND EIGHT ECLIPSING BINARIES IN HATNet FIELD G205 (2009, background): “The Safronov number of HAT-P-8b is Θ = 0.061 ± 0.003, indicating that it belongs to the so-called Class I planets as defined by Hansen & Barman (2007).”
• The coronal X-ray - age relation and its implications for the evaporation of exoplanets (2011, methodology): “Both correlations have subsequentlybeen re-plotted by a number of authors as more exoplanets have been discovered (e.g. Hansen & Barman 2007; Pollacco et al. 2008; Davis & Wheatley 2009) and are reproduced in Section 3.1 for the sample of exoplanets used in this work.”
• The Interior Structure, Composition, and Evolution of Giant Planets (2009, background): “We note that if the H/He envelope were wholly 10× solar in metallicity, the increased molecular weight of the H/He-dominated envelope would entirely negate this high-opacity effect (Hansen & Barman 2007; Guillot 2008).”
• A Unified Theory for the Atmospheres of the Hot and Very Hot Jupiters: Two Classes of Irradiated Atmospheres (2007, background): “Hansen & Barman (2007) have pointed out an interesting correlation of the known transiting planets with Safronov number; they appear to fall into two distinct classes.”
• High-precision photometry by telescope defocussing. I. The transiting planetary system WASP-5 (2009, unknown): “Its Safronov (1972) number is Θ = 0.0755 ± 0.0096, which makes it a Class II planet according to the study of Hansen & Barman (2007).”
• Homogeneous studies of transiting extrasolar planets - III. Additional planets and stellar models (2010, background): “Hansen & Barman (2007) divided up eighteen of the twenty 12 Merrill’s theorem should be borne in mind: “When one throws away discrepant results, the remainder are found to agree well.” c© 0000 RAS, MNRAS000, 000–000 TEPs then known into two classes based on their position in a diagram ofΘ versusTeq.”