THERMAL PROCESSES GOVERNING HOT-JUPITER RADII
Abstract
There have been many proposed explanations for the larger-than-expected radii of some transiting hot Jupiters, including either stellar or orbital energy deposition deep in the atmosphere or deep in the interior. In this paper, we explore the important influences on hot-Jupiter radius evolution of (1) additional heat sources in the high atmosphere, the deep atmosphere, and deep in the convective interior; (2) consistent cooling of the deep interior through the planetary dayside, nightside, and poles; (3) the degree of heat redistribution to the nightside; and (4) the presence of an upper atmosphere absorber inferred to produce anomalously hot upper atmospheres and inversions in some close-in giant planets. In particular, we compare the radius expansion effects of atmospheric and deep-interior heating at the same power levels and derive the power required to achieve a given radius increase when night-side cooling is incorporated. We find that models that include consistent day/night cooling are more similar to isotropically irradiated models when there is more heat redistributed from the dayside to the nightside. In addition, we consider the efficacy of ohmic heating in the atmosphere and/or convective interior in inflating hot Jupiters. Among our conclusions are that (1) the most highly irradiated planets cannotmore »
- Authors:
-
- Astrophysics Department, Institute for Advanced Study, Princeton, NJ 08540 (United States)
- Department of Astrophysical Sciences, Peyton Hall, Princeton University, Princeton, NJ 08544 (United States)
- Publication Date:
- OSTI Identifier:
- 22121845
- Resource Type:
- Journal Article
- Journal Name:
- Astrophysical Journal
- Additional Journal Information:
- Journal Volume: 772; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0004-637X
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; COOLING; ENERGY ABSORPTION; ENERGY LOSSES; GALACTIC EVOLUTION; HEAT SOURCES; HEATING; IRRADIATION; MAGNETIC FIELDS; PLANETARY ATMOSPHERES; PLANETS; RADIANT HEAT TRANSFER; STELLAR WINDS; VELOCITY
Citation Formats
Spiegel, David S., and Burrows, Adam. THERMAL PROCESSES GOVERNING HOT-JUPITER RADII. United States: N. p., 2013.
Web. doi:10.1088/0004-637X/772/1/76.
Spiegel, David S., & Burrows, Adam. THERMAL PROCESSES GOVERNING HOT-JUPITER RADII. United States. https://doi.org/10.1088/0004-637X/772/1/76
Spiegel, David S., and Burrows, Adam. 2013.
"THERMAL PROCESSES GOVERNING HOT-JUPITER RADII". United States. https://doi.org/10.1088/0004-637X/772/1/76.
@article{osti_22121845,
title = {THERMAL PROCESSES GOVERNING HOT-JUPITER RADII},
author = {Spiegel, David S. and Burrows, Adam},
abstractNote = {There have been many proposed explanations for the larger-than-expected radii of some transiting hot Jupiters, including either stellar or orbital energy deposition deep in the atmosphere or deep in the interior. In this paper, we explore the important influences on hot-Jupiter radius evolution of (1) additional heat sources in the high atmosphere, the deep atmosphere, and deep in the convective interior; (2) consistent cooling of the deep interior through the planetary dayside, nightside, and poles; (3) the degree of heat redistribution to the nightside; and (4) the presence of an upper atmosphere absorber inferred to produce anomalously hot upper atmospheres and inversions in some close-in giant planets. In particular, we compare the radius expansion effects of atmospheric and deep-interior heating at the same power levels and derive the power required to achieve a given radius increase when night-side cooling is incorporated. We find that models that include consistent day/night cooling are more similar to isotropically irradiated models when there is more heat redistributed from the dayside to the nightside. In addition, we consider the efficacy of ohmic heating in the atmosphere and/or convective interior in inflating hot Jupiters. Among our conclusions are that (1) the most highly irradiated planets cannot stably have uB {approx}> 10 km s{sup -1} G over a large fraction of their daysides, where u is the zonal wind speed and B is the dipolar magnetic field strength in the atmosphere, and (2) that ohmic heating cannot in and of itself lead to a runaway in planet radius.},
doi = {10.1088/0004-637X/772/1/76},
url = {https://www.osti.gov/biblio/22121845},
journal = {Astrophysical Journal},
issn = {0004-637X},
number = 1,
volume = 772,
place = {United States},
year = {Sat Jul 20 00:00:00 EDT 2013},
month = {Sat Jul 20 00:00:00 EDT 2013}
}