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Title: Planet-induced Stellar Pulsations in HAT-P-2's Eccentric System

Abstract

Extrasolar planets on eccentric short-period orbits provide a laboratory in which to study radiative and tidal interactions between a planet and its host star under extreme forcing conditions. Studying such systems probes how the planet’s atmosphere redistributes the time-varying heat flux from its host and how the host star responds to transient tidal distortion. Here, we report the insights into the planet–star interactions in HAT-P-2's eccentric planetary system gained from the analysis of ∼350 hr of 4.5 μ m observations with the Spitzer Space Telescope . The observations show no sign of orbit-to-orbit variability nor of orbital evolution of the eccentric planetary companion, HAT-P-2 b. The extensive coverage allows us to better differentiate instrumental systematics from the transient heating of HAT-P-2 b’s 4.5 μ m photosphere and yields the detection of stellar pulsations with an amplitude of approximately 40 ppm. These pulsation modes correspond to exact harmonics of the planet’s orbital frequency, indicative of a tidal origin. Transient tidal effects can excite pulsation modes in the envelope of a star, but, to date, such pulsations had only been detected in highly eccentric stellar binaries. Current stellar models are unable to reproduce HAT-P-2's pulsations, suggesting that our understanding of the interactionsmore » at play in this system is incomplete.« less

Authors:
 [1];  [2]; ;  [3];  [4];  [5];  [6];  [7];  [8];  [9];  [10];  [11];  [12];  [13];  [14];  [15]
  1. Department of Earth, Atmospheric and Planetary Sciences, MIT, 77 Massachusetts Avenue, Cambridge, MA 02139 (United States)
  2. Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218 (United States)
  3. Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125 (United States)
  4. TAPIR, Walter Burke Institute for Theoretical Physics, Mailcode 350-17, California Institute of Technology, Pasadena, CA 91125 (United States)
  5. Stellar Astrophysics Centre, Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, DK-8000 Aarhus C (Denmark)
  6. Institute for Astronomy, University of Hawaii, Honolulu, HI 96822 (United States)
  7. Department of Astronomy, Yale University, New Haven, CT 06511 (United States)
  8. Department of Astronomy, University of Maryland at College Park, College Park, MD 20742 (United States)
  9. Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91009 (United States)
  10. Department of Physics, Department of Earth and Planetary Sciences, McGill University, 3550 rue University, Montreal, QC H3A 2A7 (Canada)
  11. Department of Astronomy, University of Washington, Seattle, WA 98195 (United States)
  12. Department of Astrophysical Sciences, Princeton University, Princeton, NJ 08544 (United States)
  13. Department of Astronomy and Astrophysics, University of California, Santa Cruz, CA 95064 (United States)
  14. Department of Physics, Principia College, Elsah, IL 62028 (United States)
  15. Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ 85721 (United States)
Publication Date:
OSTI Identifier:
22654539
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal Letters; Journal Volume: 836; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; AMPLITUDES; APPROXIMATIONS; DETECTION; EVOLUTION; GAIN; HEAT; HEAT FLUX; HEATING; INTERACTIONS; ORBITS; PHOTOSPHERE; PLANETS; PULSATIONS; SATELLITE ATMOSPHERES; SATELLITES; SPACE; STABILITY; STARS; TELESCOPES

Citation Formats

Wit, Julien de, Lewis, Nikole K., Knutson, Heather A., Batygin, Konstantin, Fuller, Jim, Antoci, Victoria, Fulton, Benjamin J., Laughlin, Gregory, Deming, Drake, Shporer, Avi, Cowan, Nicolas B., Agol, Eric, Burrows, Adam S., Fortney, Jonathan J., Langton, Jonathan, and Showman, Adam P. Planet-induced Stellar Pulsations in HAT-P-2's Eccentric System. United States: N. p., 2017. Web. doi:10.3847/2041-8213/836/2/L17.
Wit, Julien de, Lewis, Nikole K., Knutson, Heather A., Batygin, Konstantin, Fuller, Jim, Antoci, Victoria, Fulton, Benjamin J., Laughlin, Gregory, Deming, Drake, Shporer, Avi, Cowan, Nicolas B., Agol, Eric, Burrows, Adam S., Fortney, Jonathan J., Langton, Jonathan, & Showman, Adam P. Planet-induced Stellar Pulsations in HAT-P-2's Eccentric System. United States. doi:10.3847/2041-8213/836/2/L17.
Wit, Julien de, Lewis, Nikole K., Knutson, Heather A., Batygin, Konstantin, Fuller, Jim, Antoci, Victoria, Fulton, Benjamin J., Laughlin, Gregory, Deming, Drake, Shporer, Avi, Cowan, Nicolas B., Agol, Eric, Burrows, Adam S., Fortney, Jonathan J., Langton, Jonathan, and Showman, Adam P. Mon . "Planet-induced Stellar Pulsations in HAT-P-2's Eccentric System". United States. doi:10.3847/2041-8213/836/2/L17.
@article{osti_22654539,
title = {Planet-induced Stellar Pulsations in HAT-P-2's Eccentric System},
author = {Wit, Julien de and Lewis, Nikole K. and Knutson, Heather A. and Batygin, Konstantin and Fuller, Jim and Antoci, Victoria and Fulton, Benjamin J. and Laughlin, Gregory and Deming, Drake and Shporer, Avi and Cowan, Nicolas B. and Agol, Eric and Burrows, Adam S. and Fortney, Jonathan J. and Langton, Jonathan and Showman, Adam P.},
abstractNote = {Extrasolar planets on eccentric short-period orbits provide a laboratory in which to study radiative and tidal interactions between a planet and its host star under extreme forcing conditions. Studying such systems probes how the planet’s atmosphere redistributes the time-varying heat flux from its host and how the host star responds to transient tidal distortion. Here, we report the insights into the planet–star interactions in HAT-P-2's eccentric planetary system gained from the analysis of ∼350 hr of 4.5 μ m observations with the Spitzer Space Telescope . The observations show no sign of orbit-to-orbit variability nor of orbital evolution of the eccentric planetary companion, HAT-P-2 b. The extensive coverage allows us to better differentiate instrumental systematics from the transient heating of HAT-P-2 b’s 4.5 μ m photosphere and yields the detection of stellar pulsations with an amplitude of approximately 40 ppm. These pulsation modes correspond to exact harmonics of the planet’s orbital frequency, indicative of a tidal origin. Transient tidal effects can excite pulsation modes in the envelope of a star, but, to date, such pulsations had only been detected in highly eccentric stellar binaries. Current stellar models are unable to reproduce HAT-P-2's pulsations, suggesting that our understanding of the interactions at play in this system is incomplete.},
doi = {10.3847/2041-8213/836/2/L17},
journal = {Astrophysical Journal Letters},
number = 2,
volume = 836,
place = {United States},
year = {Mon Feb 20 00:00:00 EST 2017},
month = {Mon Feb 20 00:00:00 EST 2017}
}