DIRECT MEASURE OF RADIATIVE AND DYNAMICAL PROPERTIES OF AN EXOPLANET ATMOSPHERE
Two decades after the discovery of 51 Peg b, the formation processes and atmospheres of short-period gas giants remain poorly understood. Observations of eccentric systems provide key insights on those topics as they can illuminate how a planet's atmosphere responds to changes in incident flux....
| Main Authors: | , , , , , , |
|---|---|
| Other Authors: | |
| Format: | Article |
| Published: |
American Astronomical Society
2018
|
| Online Access: | http://hdl.handle.net/1721.1/114269 https://orcid.org/0000-0003-2415-2191 |
| _version_ | 1826203475401244672 |
|---|---|
| author | Lewis, Nikole K. Langton, Jonathan Laughlin, Gregory Deming, Drake Batygin, Konstantin Fortney, Jonathan J. 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. Langton, Jonathan Laughlin, Gregory Deming, Drake Batygin, Konstantin Fortney, Jonathan J. de Wit, Julien |
| author_sort | Lewis, Nikole K. |
| collection | MIT |
| description | Two decades after the discovery of 51 Peg b, the formation processes and atmospheres of short-period gas giants remain poorly understood. Observations of eccentric systems provide key insights on those topics as they can illuminate how a planet's atmosphere responds to changes in incident flux. We report here the analysis of multi-day multi-channel photometry of the eccentric (e ∼ 0.93) hot Jupiter HD 80606 b obtained with the Spitzer Space Telescope. The planet's extreme eccentricity combined with the long coverage and exquisite precision of new periastron-passage observations allow us to break the degeneracy between the radiative and dynamical timescales of HD 80606 b's atmosphere and constrain its global thermal response. Our analysis reveals that the atmospheric layers probed heat rapidly (∼4 hr radiative timescale) from < 500 to 1400 K as they absorb ∼ 20% of the incoming stellar flux during the periastron passage, while the planet's rotation period is 93[subscript -35][superscript +85] hr, which exceeds the predicted pseudo-synchronous period (40 hr). |
| first_indexed | 2024-09-23T12:37:37Z |
| format | Article |
| id | mit-1721.1/114269 |
| institution | Massachusetts Institute of Technology |
| last_indexed | 2024-09-23T12:37:37Z |
| publishDate | 2018 |
| publisher | American Astronomical Society |
| record_format | dspace |
| spelling | mit-1721.1/1142692022-09-28T09:04:49Z DIRECT MEASURE OF RADIATIVE AND DYNAMICAL PROPERTIES OF AN EXOPLANET ATMOSPHERE Lewis, Nikole K. Langton, Jonathan Laughlin, Gregory Deming, Drake Batygin, Konstantin Fortney, Jonathan J. de Wit, Julien Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences de Wit, Julien Two decades after the discovery of 51 Peg b, the formation processes and atmospheres of short-period gas giants remain poorly understood. Observations of eccentric systems provide key insights on those topics as they can illuminate how a planet's atmosphere responds to changes in incident flux. We report here the analysis of multi-day multi-channel photometry of the eccentric (e ∼ 0.93) hot Jupiter HD 80606 b obtained with the Spitzer Space Telescope. The planet's extreme eccentricity combined with the long coverage and exquisite precision of new periastron-passage observations allow us to break the degeneracy between the radiative and dynamical timescales of HD 80606 b's atmosphere and constrain its global thermal response. Our analysis reveals that the atmospheric layers probed heat rapidly (∼4 hr radiative timescale) from < 500 to 1400 K as they absorb ∼ 20% of the incoming stellar flux during the periastron passage, while the planet's rotation period is 93[subscript -35][superscript +85] hr, which exceeds the predicted pseudo-synchronous period (40 hr). 2018-03-23T18:31:44Z 2018-03-23T18:31:44Z 2016-03 2016-01 2018-02-16T15:13:10Z Article http://purl.org/eprint/type/JournalArticle 2041-8213 2041-8205 http://hdl.handle.net/1721.1/114269 Wit, Julien de, et al. “DIRECT MEASURE OF RADIATIVE AND DYNAMICAL PROPERTIES OF AN EXOPLANET ATMOSPHERE.” The Astrophysical Journal, vol. 820, no. 2, Mar. 2016, p. L33. © 2016 The American Astronomical Society. https://orcid.org/0000-0003-2415-2191 http://dx.doi.org/10.3847/2041-8205/820/2/L33 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 American Astronomical Society |
| spellingShingle | Lewis, Nikole K. Langton, Jonathan Laughlin, Gregory Deming, Drake Batygin, Konstantin Fortney, Jonathan J. de Wit, Julien DIRECT MEASURE OF RADIATIVE AND DYNAMICAL PROPERTIES OF AN EXOPLANET ATMOSPHERE |
| title | DIRECT MEASURE OF RADIATIVE AND DYNAMICAL PROPERTIES OF AN EXOPLANET ATMOSPHERE |
| title_full | DIRECT MEASURE OF RADIATIVE AND DYNAMICAL PROPERTIES OF AN EXOPLANET ATMOSPHERE |
| title_fullStr | DIRECT MEASURE OF RADIATIVE AND DYNAMICAL PROPERTIES OF AN EXOPLANET ATMOSPHERE |
| title_full_unstemmed | DIRECT MEASURE OF RADIATIVE AND DYNAMICAL PROPERTIES OF AN EXOPLANET ATMOSPHERE |
| title_short | DIRECT MEASURE OF RADIATIVE AND DYNAMICAL PROPERTIES OF AN EXOPLANET ATMOSPHERE |
| title_sort | direct measure of radiative and dynamical properties of an exoplanet atmosphere |
| url | http://hdl.handle.net/1721.1/114269 https://orcid.org/0000-0003-2415-2191 |
| work_keys_str_mv | AT lewisnikolek directmeasureofradiativeanddynamicalpropertiesofanexoplanetatmosphere AT langtonjonathan directmeasureofradiativeanddynamicalpropertiesofanexoplanetatmosphere AT laughlingregory directmeasureofradiativeanddynamicalpropertiesofanexoplanetatmosphere AT demingdrake directmeasureofradiativeanddynamicalpropertiesofanexoplanetatmosphere AT batyginkonstantin directmeasureofradiativeanddynamicalpropertiesofanexoplanetatmosphere AT fortneyjonathanj directmeasureofradiativeanddynamicalpropertiesofanexoplanetatmosphere AT dewitjulien directmeasureofradiativeanddynamicalpropertiesofanexoplanetatmosphere |