Planet-induced Stellar Pulsations in HAT-P-2's Eccentric System
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...
| Main Authors: | , , , , , , , , , , , , , , , |
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| Other Authors: | |
| Format: | Article |
| Language: | en_US |
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2017
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| Online Access: | http://hdl.handle.net/1721.1/110154 https://orcid.org/0000-0003-2415-2191 |
| _version_ | 1811095050148380672 |
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| author | Lewis, Nikole K. Knutson, Heather A. Fuller, Jim Antoci, Victoria Fulton, Benjamin J. Laughlin, Gregory Deming, Drake Shporer, Avi Batygin, Konstantin Cowan, Nicolas B. Agol, Eric Burrows, Adam S. Fortney, Jonathan J. Langton, Jonathan Showman, Adam P. de Wit, Julien |
| author2 | Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences |
| author_facet | Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences Lewis, Nikole K. Knutson, Heather A. Fuller, Jim Antoci, Victoria Fulton, Benjamin J. Laughlin, Gregory Deming, Drake Shporer, Avi Batygin, Konstantin Cowan, Nicolas B. Agol, Eric Burrows, Adam S. Fortney, Jonathan J. Langton, Jonathan Showman, Adam P. de Wit, Julien |
| author_sort | Lewis, Nikole K. |
| collection | MIT |
| description | 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 μm 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 μm 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. |
| first_indexed | 2024-09-23T16:09:43Z |
| format | Article |
| id | mit-1721.1/110154 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T16:09:43Z |
| publishDate | 2017 |
| record_format | dspace |
| spelling | mit-1721.1/1101542022-10-02T06:46:44Z Planet-induced Stellar Pulsations in HAT-P-2's Eccentric System Lewis, Nikole K. Knutson, Heather A. Fuller, Jim Antoci, Victoria Fulton, Benjamin J. Laughlin, Gregory Deming, Drake Shporer, Avi Batygin, Konstantin Cowan, Nicolas B. Agol, Eric Burrows, Adam S. Fortney, Jonathan J. Langton, Jonathan Showman, Adam P. de Wit, Julien Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences de Wit, Julien 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 μm 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 μm 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. 2017-06-21T20:01:44Z 2017-06-21T20:01:44Z 2017-02 2017-01 Article http://purl.org/eprint/type/JournalArticle 2041-8213 2041-8205 http://hdl.handle.net/1721.1/110154 Wit, Julien de; Lewis, Nikole K.; Knutson, Heather A.; Fuller, Jim; Antoci, Victoria; Fulton, Benjamin J. and Laughlin, Gregory et al. “Planet-Induced Stellar Pulsations in HAT-P-2’s Eccentric System.” The Astrophysical Journal 836, no. 2 (February 2017): L17 © 2017 The American Astronomical Society https://orcid.org/0000-0003-2415-2191 en_US http://dx.doi.org/10.3847/2041-8213/836/2/L17 Astrophysical Journal. Letters Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf IOP Publishing |
| spellingShingle | Lewis, Nikole K. Knutson, Heather A. Fuller, Jim Antoci, Victoria Fulton, Benjamin J. Laughlin, Gregory Deming, Drake Shporer, Avi Batygin, Konstantin Cowan, Nicolas B. Agol, Eric Burrows, Adam S. Fortney, Jonathan J. Langton, Jonathan Showman, Adam P. de Wit, Julien Planet-induced Stellar Pulsations in HAT-P-2's Eccentric System |
| title | Planet-induced Stellar Pulsations in HAT-P-2's Eccentric System |
| title_full | Planet-induced Stellar Pulsations in HAT-P-2's Eccentric System |
| title_fullStr | Planet-induced Stellar Pulsations in HAT-P-2's Eccentric System |
| title_full_unstemmed | Planet-induced Stellar Pulsations in HAT-P-2's Eccentric System |
| title_short | Planet-induced Stellar Pulsations in HAT-P-2's Eccentric System |
| title_sort | planet induced stellar pulsations in hat p 2 s eccentric system |
| url | http://hdl.handle.net/1721.1/110154 https://orcid.org/0000-0003-2415-2191 |
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